JP3946554B2 - Fittings - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a joint tool embedded in a structure such as a concrete segment for shielding tunnel lining.
[0002]
[Prior art]
Conventionally, in a structure made of concrete or the like, a fitting made of high-strength mortar or the like is embedded in the structure, and the bolt is inserted into the bolt insertion hole of this fitting to make a bolt with another adjacent structure. By fastening, structures are joined together.
[0003]
[Problems to be solved by the invention]
In such a fitting, since a high tensile force acts on the bolt, cracks and breakage are likely to occur in the vicinity of the bolt insertion hole, resulting in a decrease in the durability of the fitting and a reduction in the pull-out strength. There was a risk of inviting.
For bolt fastening, a bolt box that is a space for inserting and rotating the bolt must be formed in the vicinity of the joint end face of the structure. This is a weak part, and has become a bottleneck to increase the strength of the structure.
[0004]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a joint tool that can increase the strength and increase the durability and can increase the pull-out strength.
[0005]
This invention is made | formed in view of the said situation, and it aims at providing the coupling tool of a concrete structure.
[0006]
[Means for Solving the Problems]
Invention according to claim 1, constituted by mortar or concrete, are embedded in the joining end face vicinity of the structure, a joint member that joins flanked structures together, said joint member is the head And a pair of body portions extending from the both sides of the head portion to the rear side, and a tail portion connecting the rear sides of the pair of body portions, each having a through hole in the center portion. forms a shape in a plan view substantially square, said the head, together with the bolt insertion hole is formed to have inserted through so the bolt from the through hole to protrude the leading end of the bolt from the joining end face, said bolt A linear, endless annular reinforcing member surrounding the hole is embedded, a linear reinforcing member is embedded in the tail portion, and each body portion includes both side portions of the head reinforcing member and the tail portion. linear reinforcing portion connecting the side portions side of the reinforcing member There are embedded, the through hole, when the joint member is embedded in said structure, characterized that you function as bolts box for fastening the bolt.
[0007]
In this way, the joint tool is made of mortar or concrete and has a square shape in plan view, and the central through hole is made to function as a bolt box, so it is a weak portion in the structure. The bolt box can be integrated with the joint to increase the strength of the structure.
Moreover, since the linear reinforcing member is connected and embedded so as to surround the through hole so as to form a substantially square shape in plan view, the periphery of the bolt box can be accurately reinforced with the reinforcing member. The structure can be further strengthened. Furthermore, since the reinforcing member is embedded so as to surround the bolt insertion hole, the bolt insertion hole, which requires high strength because a high tensile force or the like acts on the bolt, can be reinforced accurately, and the joint The pull-out strength of the tool can be increased.
[0014]
The invention according to claim 2 is a joint tool that is embedded in the vicinity of the joint end face in the structure and joins adjacent structures together, and includes at least cement, pozzolanic fine powder, aggregate, water, and It is made of concrete obtained by curing a compound containing a water reducing agent, and has a bolt insertion hole through which a bolt is inserted to project the front end side of the bolt from the joint end surface, and at least the bolt insertion A linear reinforcing member for reinforcing the position in the vicinity of the hole is embedded .
The invention described in Claim 3 is the joint device, according to claim 2, in the formulation, characterized in that the metallic fibers and / or organic fibers are contained.
[0015]
Since using such concrete joint device, concrete fluidity of hitting設前, it is possible to increase the separation resistance, and the strength of the concrete after casting extremely high, high joint member The durability can be made extremely high as strength . In addition, since a linear reinforcing member that reinforces the position in the vicinity of the bolt insertion hole is embedded, the bolt insertion hole, which requires high strength because a high tensile force or the like acts on the bolt, is properly reinforced. And the pull-out strength of the fitting can be increased.
Further, if the compound contains metal fibers and / or organic fibers, the concrete can be reinforced with fibers having excellent strength, so that the strength of the concrete can be further increased.
Furthermore, the invention according to claim 4 is the joint tool according to any one of claims 1 to 3, wherein the reinforcing member is composed of reinforcing fibers such as carbon fiber and aramid fiber. To do.
As described above, if the reinforcing fiber is used as the reinforcing member, it is possible to reduce the weight and further increase the strength of the concrete joint tool.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a coupling tool according to the present invention will be described with reference to FIGS. 1 to 3.
First, as shown in FIG. 1, the coupling tool 1 is composed of three parts, a head part 1a, a body part 1b, 1b, and a tail part 1c, and a hole for a bolt box penetrating in the vertical direction in the center part. (Through hole) 1h having a substantially square shape in plan view. The coupling tool 1 is composed of high strength mortar as a main constituent material.
[0017]
A bolt insertion hole 2 that penetrates from the bolt box hole 1h to the front end 1s in the front-rear direction is formed at the center of the head 1a. As will be described later, a bolt v is inserted into the bolt insertion hole 2. A tapered surface 1t is formed on the front end 1s side of the head 1a so as to incline from the upper, lower, left and right surfaces toward the front end 1s of the bolt insertion hole 2, and the front end 1s side of the fitting 1 is tapered. It has a shape. For this reason, it is buried more firmly in the structure.
[0018]
The trunk portions 1b, 1b form a pair, and extend from the both end portions of the head portion 1a to the rear side.
The tail portion 1c connects the rear sides of the pair of body portions 1b, 1b, and a flange portion 1f protruding outward in a flange shape is formed on the outer peripheral side thereof. When the coupling tool 1 is embedded in the structure, the flange portion 1f protrudes into the structure, so that a large pulling strength can be obtained. In addition, while the front end side of this flange part 1f is carrying out cross-sectional view substantially semicircle shape, each corner | angular part of the coupling tool 1 is chamfered, and has comprised curved-surface shape. Therefore, it has a shape in which stress concentration at a specific location hardly occurs in the structure.
[0019]
Since the head portion 1a, the pair of body portions 1b and 1b, and the tail portion 1c are arranged in a substantially square shape in this way, a bolt box hole 1h is formed in the central portion of the fitting 1. ing. As described later, the bolt box hole 1h functions as a bolt box when embedded in a concrete segment as a structure.
[0020]
A linear reinforcing member is embedded in the coupling tool 1. That is, as shown in FIG. 2, the reinforcing members 3a and 3b are disposed in the head 1a, the reinforcing member 4 is disposed in the pair of body portions 1b and 1b, and the reinforcing members 5a and 5b are disposed in the tail portion 1c. Buried.
[0021]
Each of these reinforcing members 3a, 3b, 4, 5a, 5b is composed of reinforcing fibers such as carbon fibers and aramid fibers. In addition, although metal wires, such as a steel wire and an iron wire, may be used, it is preferable to use reinforcing fibers, such as carbon fiber and an aramid fiber, from the viewpoint of reducing the weight and strength of the joint tool 1.
[0022]
The reinforcing members 3a and 3b are endless annular shapes, respectively, and are embedded in the head 1a so as to surround the bolt insertion hole 2. The reinforcing member 3a is embedded so as to surround the front end 1s side of the bolt insertion hole 2, and the reinforcing member 3b is embedded so as to surround the rear side of the bolt insertion hole 2, that is, the bolt box hole 1h side. Yes. That is, the position near the bolt insertion hole 2 is reinforced extremely strongly by the reinforcing members 3a and 3b.
[0023]
The reinforcing members 5 a and 5 b are also endless annular shapes, and are embedded in the tail portion 1. The reinforcing member 5a is embedded on the front side in the tail portion 1c, that is, on the bolt box hole 1h side, and the reinforcing member 5b is embedded in the vicinity of the flange portion 1f on the rear side of the tail portion 1c. . The reinforcing member 5b has an annular shape larger than the reinforcing member 5a so that the flange portion 1f can be properly reinforced.
[0024]
The reinforcing members 4 and 4 arranged so as to connect both side portions of the reinforcing members 3a and 3b and both side portions of the reinforcing members 5a and 5b in the front-rear direction are disposed in the body portions 1b and 1b. Embedded in each. That is, the reinforcing members 3a, 3b, 4, 5a, 5b surround the bolt box hole 1h so as to have a substantially square shape in plan view, so that the head portion 1a, the trunk portions 1b, 1b, and the tail portion 1c. Embedded in each. For this reason, the position in the vicinity of the bolt box hole 1h is reinforced extremely strongly by these reinforcing members.
[0025]
FIG. 3 shows a state in which such a coupling tool 1 is embedded in the structure. Here, a concrete segment C used for tunnel lining will be described as an example of the structure.
The joint tool 1 is embedded in the vicinity of the joint end surface Cf of the concrete segment C so that the front end portion 1s and the joint end surface Cf are substantially flush with each other. In the concrete segment C, a bolt box H is formed so as to communicate with the bolt box hole 1h. That is, the bolt box hole 1h has a function as a bolt box, which is a space for inserting and rotating the bolt v through the bolt insertion hole 2.
[0026]
When joining this concrete segment C and another concrete segment, the bolt v is inserted into the bolt insertion hole 2 from the bolt box H, and the tip end side is projected from the joining end face Cf. The concrete segments are joined to each other by rotating the bolt v and fastening the bolt with the joining end face side of the adjacent concrete segments.
[0027]
In such a coupling tool 1, linear reinforcing members 3 a and 3 b that reinforce the position near the bolt insertion hole 2 are embedded. For this reason, since the high tensile force etc. act on the volt | bolt v, the bolt insertion hole 2 with which high intensity | strength is requested | required can be reinforce | strengthened accurately, and the extraction strength of the coupling tool 1 can be raised.
[0028]
In addition, since the reinforcing member is made of reinforcing fibers such as carbon fiber and aramid fiber, it is possible to reduce the weight of the fitting and further increase the strength, and rust and corrosion occur like metal. The durability of the joint tool 1 can be further improved without any problems.
[0029]
Furthermore, the joint tool 1 is formed in a substantially square shape in plan view having a bolt box hole 1h in the center, and when the joint tool 1 is embedded in the concrete segment C, the bolt box hole 1h It functions as a bolt box H for fastening v. For this reason, the bolt box H which is a weak strength part in the concrete segment C is integrated with the joint tool 1 to increase the strength of the concrete segment C, and high durability can be obtained.
[0030]
Further, the reinforcing members 3a, 3b, 4, 5a and 5b are respectively provided in the head portion 1a, the trunk portions 1b and 1b and the tail portion 1c so as to surround the bolt box hole 1h and have a substantially square shape in plan view. I am trying to bury it. Therefore, the periphery of the bolt box H can be accurately reinforced with these reinforcing members, and the concrete segment C can be further strengthened to obtain higher durability.
[0031]
In addition, although high strength mortar is used as the main constituent material of these fittings 1, high strength concrete as shown below may be used instead of high strength mortar. This concrete is made of concrete obtained by curing a mixture containing at least cement, fine pozzolanic powder, aggregate having a particle diameter of 2 mm or less, water, and a water reducing agent.
[0032]
As the cement, mixed cements such as various Portland cements, blast furnace cements, fly ash cements and the like are particularly suitable. However, other cements may be used, and the type is not particularly limited. In addition, when trying to improve the early strength of concrete, it is preferable to use early-strength Portland cement, and when trying to improve the fluidity of concrete, use moderately hot Portland cement or low heat Portland cement. Is preferred.
[0033]
Examples of the pozzolanic fine powder include silica fume, silica dust, fly ash, slag, volcanic ash, silica sol, and precipitated silica. Silica fume and silica dust generally have an average particle size of 1.0 μm or less, and are particularly suitable because they do not need to be pulverized.
[0034]
By blending such a pozzolanic fine powder, the concrete is densified by the micro filler effect and the cement dispersing effect, and the compressive strength is improved. As the amount of pozzolanic fine powder added increases, the unit water amount increases. Therefore, the amount of pozzolanic fine powder added is preferably 5 to 50 parts by weight with respect to 100 parts by weight of cement.
[0035]
As the aggregate, it is preferable to use particles having a particle size of 2 mm or less. Here, the particle size of the aggregate is an 85 wt% cumulative particle size. In addition, although the aggregate larger than a particle size of 2 mm may be contained, when the particle size of an aggregate exceeds 2 mm, there exists a possibility that the intensity | strength of concrete may fall. That is, when considering the separation resistance of concrete or the strength after hardening, it is preferable to use an aggregate having a maximum particle size of 2 mm or less, and more preferable to use an aggregate having a maximum particle size of 1.5 mm or less. .
[0036]
As such an aggregate, river sand, land sand, sea sand, crushed sand, silica sand, and a mixture thereof can be used. The amount of the aggregate is preferably 50 to 250 parts by weight, preferably 80 to 180 parts by weight with respect to 100 parts by weight of cement, in consideration of workability and separation resistance of concrete, strength after hardening, resistance to cracks, and the like. Is more preferable.
[0037]
As the water reducing agent, a lignin-based, naphthalenesulfonic acid-based, melamine-based, or polycarboxylic acid-based water reducing agent, an AE water reducing agent, a high-performance water reducing agent, or a high-performance AE water reducing agent can be used. Among these, it is preferable to use a high performance water reducing agent or a high performance AE water reducing agent. The amount of water reducing agent added is 0.5 to 4.0 weight in terms of solid content with respect to 100 parts by weight of cement in consideration of fluidity and separation resistance of concrete, strength after hardening, and cost. Part is preferred.
[0038]
The water / cement ratio is preferably 10 to 30% and more preferably 15 to 25% in consideration of the fluidity and separation resistance of the concrete, the strength and durability of the cured body, and the like.
[0039]
In order to shorten the cement setting time, it is preferable to use a hardened material, but the type is not particularly limited. Generally, there are cement mineral type and inorganic salt type as rapid hardening materials, but usually used in tunnel construction method is cement mineral type powder, which is slurried and added to base concrete To do. Such cement mineral rapid hardeners are mainly composed of calcium aluminates or calcium sulfoaluminates, and are often used in combination with a set retarder such as citric acid or oxycarboxylate. . The amount of rapid hardening material varies depending on the construction conditions such as environmental temperature and materials used. In normal cases, powder rapid hardening material has a solid content of about 10 to 05% with respect to cement mass. For hardwood, it is about 8-15%.
[0040]
And from a viewpoint of improving the intensity | strength and toughness of the coupling tool 1, it is preferable to include a metal fiber and / or an organic fiber in a compound. Examples of the metal fibers include steel fibers and amorphous fibers, among which steel fibers are excellent in strength and are preferable from the viewpoint of cost and availability. The metal fiber preferably has a diameter of 0.01 to 1.0 mm and a length of 2 to 30 mm. If the diameter is less than 0.01 mm, the strength of the fiber itself is insufficient and it is easy to break when subjected to tension. Conversely, if the diameter exceeds 1.0 mm, the number of the same compounding amount decreases and the concrete This is because the bending strength decreases. Further, if the length exceeds 30 mm, fiber balls are likely to be produced during kneading, and if the length is less than 2 mm, the adhesive strength with the matrix decreases and the bending strength decreases.
[0041]
The blending amount of the metal fibers is preferably less than 4% of the concrete volume after setting, and more preferably less than 3.5%. In general, when the content of the metal fiber is increased, the bending strength is improved, but conversely, the unit water amount is also increased in order to secure the fluidity, and therefore the above content is considered in consideration of the fluidity and the bending strength of the cured body. An amount is preferred.
[0042]
Examples of the organic fiber include vinylon fiber, polypropylene fiber, polyethylene fiber, aramid fiber, and carbon fiber. The organic fibers preferably have a diameter of 0.005 to 1.0 mm and a length of 2 to 30 mm. The content of the organic fiber is preferably less than 10% of the concrete volume after setting, and more preferably less than 7%. Note that both metal fibers and organic fibers may be used.
[0043]
Further, from the viewpoint of increasing the packing density of the joint tool 1, it is preferable to include an inorganic powder having an average particle diameter of 3 to 20 μm, more preferably an average particle diameter of 4 to 10 μm. Examples of the inorganic powder include quartz powder, limestone powder, oxide powder such as aluminum oxide (Al ₂ O ₃ ), carbide powder such as silicon carbide (SiC), nitride powder such as silicon nitride (SiN), and the like. However, among these, quartz powder is preferable from the viewpoints of cost and quality stability of the cured body. Examples of the quartz powder include quartz, amorphous quartz, opal and cristobalite silica-containing powders, and the like. The blending amount of the inorganic powder is preferably 50 parts by weight or less, more preferably 20 to 35 parts by weight with respect to 100 parts by weight of cement, from the fluidity of concrete, the strength of the cured body, and the like.
[0044]
Furthermore, from the viewpoint of increasing the toughness of the cured body, it is preferable to include fibrous particles or flaky particles having an average particle size of 1 mm or less. Here, the particle size of the particle is the size of the maximum dimension (particularly, the length of the fibrous particle). Examples of fibrous particles include wollastonite, bauxite, mullite, and examples of flaky particles include mica flakes, talc flakes, vermiculite flakes, and alumina flakes. The blending amount of the fibrous particles or the flaky particles is preferably 35 parts by weight or less, more preferably 10 to 25 parts by weight with respect to 100 parts by weight of cement in view of the fluidity of concrete, the strength and toughness of the hardened body. In addition, it is preferable to use a fibrous particle having a needle-like degree represented by a length / diameter ratio of 3 or more from the viewpoint of increasing the toughness of the cured body.
[0045]
In this way, as concrete, at least cement, pozzolanic fine powder, aggregate, water, and the concrete containing a water reducing agent cured concrete, if used, the fluidity of the concrete before placing, Separation resistance can be increased, and the strength of the concrete after placing can be made extremely high. Therefore, the coupling tool 1 can be made high in strength and extremely durable.
[0046]
Further, if the compound contains metal fibers and / or organic fibers, the concrete can be reinforced with fibers having excellent strength, so that the strength of the concrete can be further increased.
[0047]
【The invention's effect】
As described above, according to the joint device according to the present invention, since the configuration as described above is adopted, the bolt box can be integrated with the joint device to increase the strength of the structure, thereby increasing the strength. It is possible to provide a joint tool that can improve the drawing durability and increase the drawing strength.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a coupling device according to the present invention.
2A and 2B are diagrams showing a reinforcing member embedded in the coupling tool of FIG. 1, wherein FIG. 2A is a front view, FIG. 2B is a side view, and FIG.
3A and 3B are diagrams showing a concrete structure in which the joint tool of FIG. 1 is embedded, in which FIG. 3A is a cross-sectional view in plan view, and FIG. 3B is a side cross-sectional view.
[Explanation of symbols]
1 Joint 1a Head 1b Body 1c Tail 1h Bolt box hole (through hole)
1s Tip 2 Bolt insertion holes 3a, 3b, 4, 5a, 5b Reinforcement member C Concrete segment (structure)
Cf Joint end face H Bolt box

Claims (4)

It is composed of mortar or concrete , embedded in the vicinity of the joint end face in the structure, and a joint tool for joining adjacent structures,
The coupling tool is composed of a head, a pair of trunks extending from both sides of the head to the rear side, and a tail part connecting the rear sides of the pair of trunks, The central portion has a substantially square shape in plan view with a through hole, and the head is formed with a bolt insertion hole through which a bolt is inserted from the through hole and the front end side of the bolt protrudes from the joining end surface. In addition, a linear and endless annular reinforcing member surrounding the bolt insertion hole is embedded, a linear reinforcing member is embedded in the tail portion, and both sides of the head reinforcing member are embedded in the body portion. A linear reinforcing member for connecting a portion side and both side portions of the reinforcing member of the tail portion is embedded, and the through hole is formed by the bolt when the fitting is embedded in the structure. fitting tool characterized that you function as bolts box for fastening A fitting that is embedded in the vicinity of the joining end face in the structure and joins adjacent structures,
It is made of concrete obtained by hardening a compound containing at least cement, pozzolanic fine powder, aggregate, water, and a water reducing agent, and a bolt is inserted so that the tip of the bolt protrudes from the joint end face. with the bolt insertion hole is formed, joint characterized in that at least the bolt insertion holes linear reinforcing member for reinforcing the vicinity of is embedded Taegu. During the formulation, joint tool according to claim 2, characterized that you have contained metal fibers and / or organic fibers. The reinforcing member joint device according to any one of claims 1 to 3, characterized in that it is constituted by reinforcing fibers such as carbon fibers, aramid fibers.

Images