JP2002285703A - Sealing member in expansion joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To seal an end section by installation to a fixed vessel in structural solidity by simple handling operation, to easily and surely insert a reinforcement at a fixed place by filling the inside of the fixed vessel with an expansion material without exception and to enable mass production and reduce manufacturing cost regarding a sealing member in an expansion joint. SOLUTION: The sealing member 4 sealing the side face of the opening section 1a of the fixed vessel 1 for the expansion joint is formed of a synthetic- resin plasticizer and a rubber having flexibility, and a front approximately- circular groove 6 having a cut-remaining section 6a in a manner that a member to be clamped can be pushed in in a part is formed on the external surface side, leaving a thin-wall sectional sealing section 4A1 on the internal surface side of a sealing main body section 4A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing member for an expansion joint, and relates to a method for expanding a material to be fastened, such as a reinforcing bar buried in a joint end of a reinforced concrete or a secondary concrete product cast in place in civil engineering or construction, by expanding an expanding material. To easily and surely seal the joint end of the fixed container of the expansion joint which is fixed by the press and the prestress caused by the press.

[0002]

2. Description of the Related Art Conventionally, in a reinforced concrete structure, as a joint method for joining reinforcing bars arranged inside concrete, there is, for example, a joint for joining the ends of the reinforcing bars by welding or the like. As another method, there has been a method of lap splicing in which a metal wire material is wound around an overlapping portion formed at an end portion of a reinforcing bar and bound. As another joint method, there is a threaded joint in which a thread is provided at a joint end of a reinforcing bar and joined. As another method, there is a mortar joint method in which rebars are joined to each other by the adhesive strength of mortar to be filled.

[0003]

The above-mentioned conventional joint method for joining rebars by welding requires a lot of time and labor for welding rebars at a construction site, and also requires specialized welding. It required efficient welding techniques and the work was inefficient. Also, the lap splicing method of winding the metal wire on the overlapping portion of the opposing rebars also involves winding the metal wire on the overlapping portion at the end of the reinforcing bar, which requires much time and time. It required effort. Also, threaded joints that provide a thread at the joint end of a reinforcing bar require a lot of time and labor to process screws on the reinforcing bar and to connect the reinforcing bars to each other, making work inefficient. Met. Furthermore, since the mortar joint method fixes the rebars only depending on the adhesive force between the rebar and the concrete, it is necessary to take a sufficient length of the rebars to fix each other. In addition, the mortar joint method may not be able to express the adhesive strength of the mortar to the reinforcing bar depending on the mixing and mixing of the materials. In addition, for example, when joining the reinforcing bars of concrete secondary products,
The mortar cannot be filled into the joints as a fixing material until the joining ends of the concrete secondary products have been joined to each other, and the worker can visually check the mortar filling state from outside the concrete secondary products. I couldn't.

The inventor of the present invention has found that when a hollow fixed container is filled with a certain type of intumescent material and sealed, a large prestress and press are generated. After many years of research and efforts to join the rebars buried at the joint end of cast-in-place concrete or concrete secondary products where the pre-stress and press are cast in-situ, as a result of the practical use as expansion joints It has come to be. With this expansion joint, it is possible to join the rebar with high working efficiency without requiring much labor in a short time,
Also, even if the fastening length between the reinforcing bars is short, it is possible to connect the structure firmly with sufficient adhesion force, and even before the joining ends of the secondary concrete products are joined, the filling state of the expansive filler can be externally checked. It has been found that there are advantages such as being able to be visually confirmed. Also, with this expansion joint, filling the hollow inside of the fixed container with a filler to prevent leakage,
After filling with filler, the end of the fixed container that facilitates the insertion of the reinforcing bars that are to be joined together and that the reinforcing bars are inserted without inserting unnecessary openings in the radial direction by opening an opening for inserting the reinforcing bars. A sealing member for securely sealing the portion is an indispensable member, and manufacturing this sealing member has also been an important issue.

SUMMARY OF THE INVENTION In view of the above-mentioned points, the present invention makes it possible to securely mount and securely seal a structure on a side surface of a connection end of a fixed container by a simple handling operation. After filling the expansive material in the fixed container, the rebar can be easily and reliably inserted into the predetermined position,
Further, it is intended to provide a sealing member for an expansion joint that can be mass-produced and can be manufactured at a low manufacturing cost.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an invention according to claim 1 is buried in a joint end of a cast concrete or a concrete secondary product and is formed in a hollow shape by a rigid material. A fixed container, an opposed material to be fastened inserted into the fixed container, and an inflatable material filled in the fixed container, wherein the inflatable material is fixed by pressurizing and pressing the inflatable material to expand. To seal the opening on the side of the fixed container of the expansion joint to be
The sealing member is formed of a flexible synthetic resin plastic or rubber and has a substantially circular groove on the front surface having a part of a cut-out part in a part to be able to push in the material to be fastened on the inner surface side of the sealing main body. Means is adopted in which the seal portion is formed on the outer surface side except for the seal portion.

According to a second aspect of the present invention, in the first aspect, the groove is formed by any one of a V-shaped cross section, a U-shaped cross section, a semicircular cross section, a cut groove, and a perforation. The means of being a feature was adopted.

According to a third aspect of the present invention, there is provided the method according to any one of the first, second and third aspects, wherein the sealing main body is provided on the inner peripheral side with the end of the fixed container. And the outer peripheral side is provided so as to be able to come into close contact with the insertion end of the fixed container with respect to the inserted concrete or the secondary product of the concrete or the secondary product of the concrete, and to be inclined downward toward the back. And an outer edge portion having a substantially triangular cross-section, which is formed by an inclined surface portion, is formed on the outer periphery.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 7 together with an expansion joint using one embodiment of the sealing member of the present invention. Reference numeral 1 denotes a fixed container formed of a rigid material in a hollow shape and formed, for example, as a straight tubular sleeve open on two sides, and the fixed container 1 is a joint end 2 of a cast concrete K or a concrete secondary product K '. , 2. The fixed container 1 is formed of, for example, steel.
Its diameter φ ₁ is about 30 to 80 mm, and the wall thickness t is about 3 to 15
mm.

Reference numeral 3 denotes an inflatable material which is filled and accommodated in the fixed container 1. The inflatable material 3 is inserted into the fixed container 1 via the sealing members 4 and 4 by a prestress and a press which expands. The ends 5a, 5a of the rebars 5, 5 as the materials to be fastened are fixed to each other. The expanding material 3 used in the present embodiment contains about 80.0 to 84.0% by weight of calcium oxide as a main component for expanding, occupies most of more than 80% of the total weight, and loss on ignition. About 1.0 to 2.0% by weight, about 8.0 to 9.0% by weight of silicon dioxide as an admixture, and about 2.0 to 2.3% by weight of aluminum oxide as an expansion aid for calcium oxide.
Including. Thus, the expansion material 3 used in the present embodiment is
Contains about 80.0 to 84.0% by weight of calcium oxide, so that the hydration reaction is promoted quickly and smoothly with the aid of about 2.0 to 2.3% by weight of aluminum oxide, In addition, it is possible to reliably and reliably fix the reinforcing bars 5 and 5 inserted into the fixed container 1 by being expanded in the fixed container 1, and the expansion material 3 is made denser and stronger by the void filling action of aluminum oxide. It is highly compressed and can be fixed firmly in structure.

The sealing member 4 is for closing the openings 1a, 1a provided on two sides of the fixed container 1. This sealing member 4 is, for example, as shown in FIG. A sealing portion 4A having a thin section in the inner surface side of the sealing main portion 4A is formed with a substantially circular groove 6 in front of the sealing main portion 4A which is formed of a resin plastic or rubber and has a cut-out portion 6a in a part so as to be able to push a reinforcing bar 5 as a material to be fastened. It is formed on the outer surface side except for ₁ . 7
Is an outer edge formed on the outer periphery of the sealing main body 5A and having a substantially annular back surface and a substantially triangular cross section. The outer edge 7 is provided on the inner peripheral side so that the end 1b of the fixed container 1 is fitted. Inserted concrete K or concrete secondary product K 'intersecting with the insertion inner edge 7a and on the outer peripheral side with the insertion inner edge 7a
And an inclined surface portion 7b which is provided so as to be able to come into close contact with the insertion end of the fixed container 1 and has a downward slope θ as going deeper. Reference numeral 8 denotes a filling hole provided on the outer peripheral side of the groove 6 in the sealing main body portion 4A.
The expansion material 3 is filled therein. The diameter, shape, and number of the filling holes 8 are selected appropriately so as to facilitate filling of the expanding material 3. In order to fill the expansion container 3 into the fixed container 1, a funnel-shaped injection container (not shown) that accommodates the expansion member 3, for example, without forcibly feeding using a device such as a pump is used. Thus, injection into the fixed container 1 from the filling hole 8 can be performed easily and reliably. 8A is an air vent.

The groove 6 is formed, for example, in a V-shaped cross section in the drawing, but this is merely an example and may be any of, for example, a U-shaped cross section, a semicircular cross section, a cut groove, or a perforation. When inserting the reinforcing bar 5 as a fastening material, the reinforcing bar 5 is easily inserted, and more than necessary tears are formed in the sealing main body portion 4A by inserting the reinforcing bar 5 except that an opening for inserting the reinforcing bar 5 is opened at the time of insertion. Any material may be used as long as it reliably seals the opening 1a of the fixed container 1 without the inflation material 3 generated and filled in the fixed container 1 leaking out.

Numeral 9 denotes a tapered mounting surface which is formed at the joining ends 2 and 2 of the cast concrete K or the concrete secondary product K 'so as to have a substantially annular front surface and opens outward in cross section. The mounting surface 9 is, for example, a secondary concrete product K '.
When molding is performed using a mold in a factory, it also becomes a draft for facilitating stripping.

S is used when the sealing members 4 and 4 are attached to seal the joining ends 2 and 2 of the fixed container 1 embedded in the concrete concrete K or the secondary concrete product K '. The adhesive S is formed by applying a foreign material between a steel material for forming the fixed container 1 and a synthetic resin plastic or rubber for forming the sealing member 4 to the mounting surface 9. The curing time is short until the adhesive function is exhibited, and after curing, the adhesive strength is high, the mechanical strength is strong such that the structure can be joined firmly, and the electrical insulation is excellent, for example, epoxy-based bonding The agent is used optimally, but this is by way of example only and may be anything that is readily available and that can sufficiently guarantee the adhesive strength between foreign substances.

One embodiment of the present invention is constituted as described above, and is a concrete concrete product K 'cast at a construction site or a concrete secondary product K' formed at a factory.
In order to join the ends 5a, 5a of the reinforcing bars 5, 5 buried in each other, first, as shown in FIG. 2, an opening 1a which is formed in a hollow shape by a rigid material such as a steel material and has two sides opened, for example. ,
A fixed container 1 consisting of a straight tubular sleeve having a core 1a is cast into concrete K or a concrete secondary product K ',
It is embedded in at least one of the joining ends 2 and 2 of K '.

Next, sealing is performed on an opening 1a provided on the side surface of the fixed container 1 formed of a rigid material, in FIG. 2, on the side surface on the joint end 2 side of the poured concrete K or one of the concrete secondary products K '. The stop member 4 is attached and sealed. At this time, the sealing member 4 is provided with an insertion inner edge portion 7a on the inner peripheral side at the outer edge of the sealing main body portion 4A, and the driving concrete K or An inclined surface portion 7 which is provided so as to be in close contact with the end 1b of the fixed container 1 for the concrete secondary product K ', and has a downward slope θ as going deeper.
b, the outer peripheral portion 7 having a substantially triangular cross-section is formed, so that a tapered mounting surface having a cross-sectional outward opening desired at the joining ends 2 and 2 of the poured concrete K or the secondary concrete product K '. 9 is coated with an adhesive S. Thereafter, by a simple handling operation of pressing the outer edge 7 of the sealing member 4 against the mounting surface 9, the insertion inner edge 7 a on the inner peripheral side of the outer edge 7 is attached to the end 1 b of the fixed container 1. Are tightly fitted, and the inclined surface portion 7b on the outer peripheral side is tightly contacted along the tapered mounting surface 9 having a cross-section opening desired at the joining ends 2 and 2. The member 4 can be quickly and reliably adhered and attached to the side surface of the fixed container 1, and the opening 1a is sealed. In addition, since the sealing member 4 formed of a synthetic plastic or rubber having flexibility is not deformed by an excessive pressing force, an appropriate flat surface is provided at a predetermined position on the side surface of the fixed end of the fixed container 1. The opening 1a can be securely sealed by being attached with a certain degree.

At this time, the excess amount of the applied adhesive S is applied to the inclined surface 7b along the inclined surface 7b having a downward slope θ as it goes deeper by the pressing of the outer edge 7 of the outer edge of the sealing member 4. The gap between the mounting surface 9 and the mounting surface 9 is pushed to the outer peripheral side. Accordingly, there is no inconvenience that an excessive amount of the adhesive S flows back into the fixed container 1 to adversely affect the expansion performance of the expandable material 3 and the sealing member 4 is pushed back by the repulsive force of the adhesive S. Disappears. Thus, the inclined surface portion 7b
Is formed to have a downward slope θ as it goes deeper, and the mounting surface 9 has a tapered shape with an open cross section, so that the mutual contact area increases. Therefore, the bonding effect of the adhesive S to the sealing member 4 is reduced. Improves the structure and makes the installation state robust.

After that, the concrete K
Before the concrete container is cast and cured, solidified and completed, or before the concrete secondary products K 'and K' are joined together,
By inserting at least one reinforcing bar 5 to be bonded via the sealing member 4 from one of the bonding ends 2 buried therein, the end 5a of the reinforcing bar 5 is already inserted into the fixed container 1 from the other side. To the end 5 a of the other reinforcing bar 5. Formed at this time, the outer surface side leaving a sealing portion 4A ₁ of section thin on the inner surface side of the groove 6 of the front substantially circular sealing member 4 closes the opening 1a of the fixed container 1 is closed body portion 4A When the rebar 5 is pushed into the sealing main body 4A, the inner region T surrounded by the groove 6 of the sealing main body 4A is cut off except for the uncut portion 6a, so that the inside of the fixed container 1 is removed. It is turned up and pushed. Therefore, the reinforcing bar 5 as a material to be fastened is
The opening surrounded by the substantially circular groove 6 on the front is opened by an amount corresponding to the insertion of the reinforcing bar 5, so that the inserting operation of the reinforcing bar 5 is performed quickly and smoothly, and the sealing main body portion 4 </ b> A is inserted along with the insertion of the reinforcing bar 5. Does not cause radial tears, so that leakage of the expanding material 3 is eliminated. When the reinforcing bar 5 is a different diameter bar in which a large diameter portion and a small diameter portion are formed alternately and continuously in the longitudinal direction, the small diameter portion of the reinforcing bar 5 matches the opening just surrounded by the groove 6. As described later, leakage of the expanding material 3 filled in the fixed container 1 from the insertion portion can be more reliably prevented.

Then, when the expansion material 3 is filled into the fixed container 1 through the filling hole 8 formed in the sealing member 4 using a funnel-shaped injection container (not shown), the filling material is inserted into the fixed container 1. The reinforcing bars 5, 5 are expanded members 3, which are constrained with a peripheral wall around the fixed container 1 filled in the fixed container 1 as a reference plane.
The adhesive strength is increased by the pre-stress and the press generated by the large expansion force of the resin, and the toner is firmly fixed.

Then, the expansion material 3 is expanded in the fixed container 1 so that, for example, as shown in FIG.
_{Since 1} occurs, a strain ω is generated in the fixed container 1 in the circumferential direction. At this time, when the thickness t of the fixed container 1 formed of a steel material is extremely thick, the strain ω of the fixed container 1 becomes small due to the expansion pressure of the expanding material 3. Further, when the thickness t of the fixed container 1 is further increased, the strain ω generated in the fixed container 1 finally becomes a region of zero value. This phenomenon is because most of the expansion energy generated due to the large restraint of the fixed container 1 that fills and accommodates the expansion material 3 with the expansion material 3 consumes energy to consolidate the internal tissue of the expansion material 3 and the press effect (consolidation). Effect). By the way, when the thickness t of the fixed container 1 is increased to obtain a large expansion pressure of the expandable material 3 by the pressing effect, the cover thickness between the reinforcing bars 5 inserted into the fixed container 1 is sufficiently ensured. The diameter φ of the tubular fixed container 1 in order to secure the structurally solid cast concrete K and the concrete secondary product K ′
It is preferable that ₁ has a tendency to be thin.

Conversely, when the thickness t of the fixed container 1 is made thin, the strain ω ′ of the fixed container 1 increases due to the expansion pressure of the expanding material 3. Then, the thickness t of the fixed container 1 is further increased.
Is formed, the rigidity of the fixed container 1 is not effectively exhibited, and the fixed container 1 becomes unstable and freely deformed to reach a region where the inflation pressure becomes zero. This phenomenon is that most of the expansion energy generated by the expansion of the expansion material 3 is consumed to consume the strain ω ′ of the fixed container 1 made of steel, and as shown in FIG. 1 center O
Tensile force acting on the expansion material 3 as tension P ₂ ,
Called the prestress effect. Thus, the magnitude of the prestressing effect and the pressing effect differ depending on the thickness t of the fixed container 1 formed of the steel material as the rigid material, and the magnitude of the fixing force of the expansion joint to the rebars 5, 5 is large or small. ,
In other words, the thickness t of the fixed container 1 is set to 3 to 15 mm in the present embodiment in order to obtain the optimum joint performance. This is the area where

In the present embodiment, the prestressing effect and the pressing effect (consolidation effect) caused by the expansion of the expansion material 3 filled and accommodated in the fixed container 1 formed of the rigid material are applied to the reinforcing bars 5 and 5. Since the strength is increased and the reinforcing bars 5 and 5 are fixed by the expansion material 3, the opposing reinforcing bars 5 and 5 arranged in the poured concrete K or the concrete secondary product K 'can be firmly fixed.
The fixing length of the rebars 5, 5 can be designed to be short.

Further, in the conventional mortar joint method which depends on the adhesive force between the reinforcing steel and the concrete, the reinforcing steel depends on the mixing and mixing of the materials forming the cast concrete K and the secondary concrete product K 'at the construction site. There is no inconvenience of not exhibiting adhesive force to 5, 5 and the expansion joint is
Even under construction under relatively bad conditions, the reinforcing bars 5, 5 can be reliably fixed by a sufficient inflation pressure of the inflation material 3 filled and fixed in the fixed container 1 formed of a rigid material, and as a structural joint Demonstrate stable performance.

The expansion joint has openings 1a, 1a provided at two front and rear sides of a straight tubular fixed container 1 formed of a rigid material.
a can be reliably prevented from leaking around the fixed container 1 by being sealed by the sealing member 4. In addition, the filling of the expansive material 3 into the fixed container 1 is performed before the casting of the cast concrete K at the construction site or before the mutual connection of the concrete secondary products K ′ and K ′ with each other. The filling material 8 can be filled while visually confirming the filling amount through a filling hole 8 provided facing the joining end 2 side of the fixed container 1 embedded in at least one of the joining ends 2 of K ′. Reinforcing bar 5, 5
It is possible to fix each other securely and robustly.

The reinforcing joints 5 and 5 are provided by using the expansion joint of the present invention.
For example, box culverts, L-type retaining wall blocks, large open-groove type waterway blocks, large U-type groove blocks, common groove blocks, manholes, underground type Water tank block,
Revetment blocks, revetment blocks, bridge girders and their foundation blocks. Moreover, in the above description, the case where the reinforcing bars 5 and 5 are used as the members to be fastened was described as a representative,
The member to be fastened is not limited to the reinforcing bar 5 and may be a material obtained by converging and solidifying, for example, carbon fiber, metal fiber, synthetic resin fiber, glass fiber, or the like.

[0026]

The present invention is as described above, and the invention according to claim 1 comprises a fixed container buried in a joint end of a poured concrete or a secondary concrete product and formed hollow by a rigid material, An expansion joint for fixing the material to be fastened by a prestress and a press, wherein the material to be fastened and the material to be fastened are inserted into the fixed container and an inflating material filled in the fixed container. A front side having a part to be closed to seal an opening on a side surface of the fixed container, and the sealing member is formed of a synthetic resin plastic or rubber having flexibility, and a part of the notch can be pushed into the material to be fastened. Since a substantially circular groove is formed on the outer surface side, leaving a thin-walled seal portion on the inner surface side of the sealing main body portion, it can be securely mounted on the fixed container by a simple handling operation, and without leakage. expansion Can be filled in the fixed container, and after filling the fixed container with the filler, the reinforcing bar can be easily and securely inserted into the predetermined position, so that the opening at the end of the fixed container is securely sealed. Can be stopped. Furthermore, since the sealing member can be mass-produced, the manufacturing cost is reduced.

According to a second aspect of the present invention, in the first aspect, the groove is formed by any one of a V-shaped cross section, a U-shaped cross section, a semicircular cross section, a cut groove, and a perforation. When a reinforcing bar is inserted, a sufficient opening can be quickly and reliably opened just by inserting the reinforcing bar, and an unnecessary crack or the like is not generated, so that the expanding material does not leak out.

According to a third aspect of the present invention, there is provided a method according to any one of the first, second and third aspects.
The sealing main body portion is provided on the inner peripheral side and has an inserted inner edge portion into which the end portion of the fixed container is fitted, and the outer peripheral side intersects with the inserted inner edge portion and is the concrete or concrete secondary product. The outer edge of a substantially triangular cross section comprising an inclined surface portion which is provided close to the insertion end of the fixed container and which slopes downward as it goes deeper is formed on the outer periphery, so the insertion provided on the inner peripheral side of the outer edge portion The end of the fixed container can be inserted into the inner edge portion, and the inclined surface on the outer peripheral side can push back the adhesive by a simple handling operation on the side surface of the fixed container embedded in cast concrete or concrete secondary product. The adhesive can be securely and closely attached without increasing the adhesive strength, and an excessive amount of adhesive does not enter the fixed container and adversely affect the expanding material.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view showing a first embodiment of the present invention and showing a state in which a reinforcing bar is inserted into a fixed container of an expansion joint via a sealing member.

FIG. 2 is a partial cross-sectional view showing a state in which reinforcing bars are connected to each other.

FIG. 3 is a front view showing a sealing member of the present embodiment.

FIG. 4 is a sectional view showing the state of attachment of the sealing member.

FIG. 5 is a cross-sectional view taken along the line AA of FIG. 2;

6 is a similarly cross-sectional view of a state to exert pressing effect at work inflation pressure of the pressure P ₁ towards the circumferential direction of the container body by the expansion member.

[7] Also expansion stress of the container body is a sectional view of a state to exert prestress effect acts on the expansion material as tension P _2.

[Description of Signs] 1 Fixed container 1a Opening 2 Joining end 3 Inflatable material 4 Sealing member 4A Sealing main body 4A ₁ Sealing part 5 Reinforcing bar 5a End 6 Groove 6a Uncut portion 7 Outer edge 7a Insert inner edge 7b Inclined Face 8 Filling hole K Cast concrete K 'Concrete secondary product t Wall thickness

Claims (3)

[Claims] 1. A fixed container buried in a joint end of a poured concrete or a concrete secondary product and formed into a hollow shape by a rigid material, opposed members to be inserted into the fixed container, and the fixed container An expansion material to be filled in the expansion joint, which seals the opening on the side surface of the fixed container of the expansion joint for fixing the material to be fastened by a prestress and a press in which the expansion material expands. The stop member is formed of a flexible synthetic resin plastic or rubber, and has a substantially circular front groove having a partially cut-out portion on the inner surface side of the sealing main portion so as to be able to push the material to be fastened. The sealing member in the expansion joint characterized in that the sealing member is formed on the outer surface side except for the above. 2. The sealing member according to claim 1, wherein the groove is formed by one of a V-shaped cross section, a U-shaped cross section, a semicircular cross section, a cut groove, and a perforation. . 3. The insert concrete which is provided on the inner peripheral side of the sealing main body portion and into which the end of the fixed container is fitted, and the outer peripheral side of the insert concrete crosses the insert inner edge. 2. An outer peripheral portion having a substantially triangular cross section, comprising an inclined surface portion which is provided close to an insertion end of a fixed container for a concrete secondary product and has a downwardly inclined surface as it goes deeper, is formed on the outer periphery. A sealing member in the expansion joint according to any one of claims 2 and 3.