JPH0346007Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to an improvement of the sealing part of a corner bending buffer device that prevents corner bending, etc. at the anchoring part of a cable, especially the anchoring part of a cable-stayed bridge multi-cable. It is. [Prior Art] Conventionally, cables, especially cable-stayed bridge cables, which suspend the girders of cable-stayed bridges with high-strength cables, have been known to undergo elastic deformation of girders and towers due to live load loading,
Bending moment concentrates on the socket end of the cable due to changes in cable sag (SAG) and angle changes at the cable anchorage due to vibrations, etc. To prevent this, shock absorbers are installed at both ends or at one end of the cable. As a conventional example of this shock absorber, a shock absorber according to the applicant's earlier application is shown in FIGS. 6 to 9. FIG. 6 is a partially sectional front view of the shock absorber showing the mounting device, and FIG. 7 is a sectional view taken along the line -- in FIG. 6. In the figure, 1 is a cable covered with a cable tube 1a, and 1a is a cable tube made of thermoplastic plastic, and generally high-density polyethylene is used. This conventional elastomer support 2 made of an elastic polymer material has a cylindrical body 2a,
It consists of a lip-shaped part 2c that tapers to hold the cable, and is formed by molding into two halves. The body 2a of the elastomer support 2 is attached to the cable 1 using a bifurcated support fitting 5, and a synthetic resin layer 3 is injected in liquid form into the gap between the elastomer support 2 and the cable 1. It is formed by press-fitting it with a syringe and hardening it. Reference numeral 5 denotes a support fitting made of a two-piece metal plate for fixing the elastomer support 2 . Figure 8 shows the injection of synthetic resin in Figure 6.
The dotted line shows the internal state when a leakage prevention material 6 made of open elastomer cells is fixed to the inclined inner peripheral surface of the tapered lip 2c that has a length that contacts the cable 1 as a measure to prevent leakage of the synthetic resin. FIG. 2 is a front view of the elastomer support 2 shown in FIG. That is, it is a front view when the cable 1 is set at approximately the center position of the elastomer support 2 . FIG. 9 is a sectional view showing a state in which the elastomer support 2 of FIG. 8 is installed eccentrically. As shown in the figure, the open-cell leakage prevention material 6 has a skin layer 6a formed at the boundary with the synthetic resin layer 3 to suppress penetration of liquid synthetic resin. This leakage prevention material 6 is attached to the cable 1
is an open cell foam that is about 2 to 3 times thicker than the gap between the inner surface of the body 2a and the cable 1 when set at the center position. It is set by compressing and fixing the halved elastomer support body 2 with the halved support fitting 5. Therefore, when set to the eccentric state, the lip-shaped portion 2c forms a state of a compression surface portion PF and an eccentric opening portion EO. The synthetic resin layer 3 is injected from the injection port 7 into the hollow space between the leak prevention materials 6 at both ends in this compressed and fixed state, the air in the hollow space is discharged from the discharge port 8, and the synthetic resin liquid is filled and hardened. A synthetic resin layer 3 is formed and integrally fixed. The above is an overview of the prior art shock absorber. [Problem to be solved by the invention] In the above-mentioned prior art, the lip-like portion 2c of the elastomer support is formed long so as to be in contact with the cable, and is divided into two parts and gradually tapered toward the outside. Since it is an end, as long as the wall thickness does not increase significantly, if the leakage prevention material made of open cells is compressed and fixed with the lip-like part 2c of the split elastomer support, the free tip of the lip-like part will have a free tendency to open and deform. The degree of deformation is large, and the deformation increases with the passage of time. Therefore, the ability to prevent leakage of the synthetic resin liquid that is press-fitted is low. In particular, in the case of an eccentric state, there is a problem in that there is a large inconsistency in sealing performance. Therefore, a skin layer 6a is formed at the inner boundary of the open cells of the leakage prevention material 6 to suppress permeation and leakage of the liquid synthetic resin during injection. Therefore, penetration and leakage of the synthetic resin liquid is suppressed, but the tip of the lip portion has a tendency to open and deform, and the interior of the lip portion maintains the deformability of open cells. The body of the elastomer support is integrally and strongly fixed to this tip by a synthetic resin layer. That is,
In contrast to the fixed strength of the synthetic resin layer, the lip portion is highly deformable and forms an unstable and unbalanced state. Therefore, it is necessary to improve the freedom of the tip of the lip-like part and the problem of unbalanced and unstable physical properties. Note that the elastomer used in this shock absorber is a general term for rubber or an elastic polymer substance having rubber-like elasticity. [Means for Solving the Problems] In order to solve the above problems, the inventors first suppressed the degree of freedom and fluctuation of the tip of the lip-shaped portion of the elastomer support to maintain a stable tip state over a long period of time. to keep it. Next, measures are taken to eliminate the large unbalanced state by making the large difference in physical properties between the open cell leakage prevention material and the synthetic resin layer as close as possible. Therefore, the tip of the lip should be long enough to form a gap that does not touch the cable, and the lip should be embedded in an open-cell leak-preventing material, and this open-cell elastomer foam does not require a skin layer. First, by penetrating and hardening the synthetic resin liquid, the bubbles are sufficiently filled with the synthetic resin, resulting in a more uniform composite of the elastomer and the synthetic resin, which exhibits a sealing effect. That is, by embedding and compressing the lip of the elastomer support into the elastomer foam, a proper sealing function of the elastomer foam is achieved so that leakage is prevented and a composite is obtained. The structure is such that a fitting groove portion into which a lip-shaped portion is fitted is formed in a sealing material that is a leakage prevention material.
The joint is compressed and buried to suppress the degree of freedom and fluctuation of the tip of the lip. The detailed specific structure of the above will be explained in detail in the embodiments described below based on the drawings. [Function] As mentioned above, the lip of the elastomer support is fitted and compressed into the fitting groove of the sealing material made of open-cell elastomer foam. It does not easily increase deformation over time, shows no tendency to open, regardless of the bias of the cable settings, and maintains an appropriate stable state, and due to the compression sealing material by fitting and embedding the lip-like part. , it exhibits a large resistance to the injection pressure of the synthetic resin liquid, prevents leakage, provides a good composite, and performs good filling and curing of the synthetic resin layer, and connects the body of the elastomer support to the cable. is integrally fixed by a synthetic resin layer, and the lip is more integrally supported by the integral composite of synthetic resin and elastomer foam and adhesion by penetration of synthetic resin liquid into this, increasing sealing strength. Possess. Therefore, the large unbalanced state of physical properties between the body part on which the synthetic resin layer of the elastomer support is formed and the lip-like part where the sealing material is set is eliminated, and appropriate shock-absorbing fixation and shock-absorbing operation are obtained, resulting in an effective cable. This provides the effect of preventing corner bending. [Example] Figure 1 shows a longitudinal section of the elastomer support of the corner bending buffer when the cable is set at the center position of the elastomer support, and Figure 2 shows the cable in an eccentric state. This figure shows a longitudinal cross section of the elastomer support when it is set to . In the figure, 1 is a cable covered with a cable tube 1a, and 1a is a cable tube made of thermoplastic plastic, and generally high-density polyethylene is used. Reference numeral 2 denotes an elastomer support made of an elastic polymeric material, and this elastomer support 2 consists of a cylindrical body portion 2a and a lip-like portion 2b, and is formed into two halves by molding. This lip-shaped portion 2b is formed to a length such that its tip does not come into contact with the cable, and the lip-shaped portion is embedded in the seal. 3 is a synthetic resin layer; 4 is a sealing material made of open elastomer cells (elastomer foam) for preventing leakage and sealing the openings at both ends of the elastomer support, which is set in a compressed state. b, the cable 1 is connected to the elastomer support 2
A liquid synthetic resin is injected and cured into this space between the cable 1 and the inner surface of the body 2a when the cable 1 is set at the center position, and the synthetic resin layer 3 is formed. It is an integral combination of the following. The injection port for the synthetic resin and the discharge port for the air in the hollow part are provided at appropriate positions, taking into account the on-site operation. Furthermore, the lip 2
Since the tip of b is embedded in the sealing material 4 and set in a compressed state, a high degree of resistance to the injection pressure of the synthetic resin is obtained, and a composite is obtained by curing without the synthetic resin leaking to the outside, resulting in stable strength. An integrally bonded, cushioning seal is obtained. In addition,
The liquid synthetic resin constituting the synthetic resin layer is usually selected from epoxy, unsaturated polyester, and polyurethane resins with appropriate hardness. FIG. 2 shows a longitudinal section when the cable is set eccentrically with respect to the elastomer support. FIG. 3-A is a plan view of the elastomer foam sealing material 4 in an uncompressed state before setting;
Figure B is a side view of the same, and is molded into a split mold having a circumferential length with a presser margin set at 1/2 of the circumference. In the figure, 4a is a fitting groove into which the tip of the lip-shaped part 2b of the elastomer support 2 is fitted;
is the fitting hole of the cable 1, and a is the sealing material 4.
It shows the thickness of . This thickness a changes depending on the apparent specific gravity and degree of compression of the elastomer foam, but it is approximately the same as the distance b in Figure 1.
It is determined as appropriate based on a standard of about 1.5 to 2.5 times. FIG. 4 is a perspective view showing a combined state of the elastomer support 2 and the sealing material 4 , which are split in half. As shown in the perspective view, the split elastomer support 2 has a presser foot in an uncompressed state. It is used in combination with a sealing material 4 . For this combination,
It is difficult to work on the sealing material 4 unless it is partially glued, but the sealing material 4 needs to be completely fitted into the sealing part by compressive deformation, as shown in FIG. One part is bonded and the other part is not bonded. FIG. 5-A is a plan view of the elastomeric support;
FIG. 5-B is a side view of the same, and the dash-dotted line frame in FIG. 5-A shows an example of the adhesive area BA of the sealing material 4 , and the side view of FIG. 5-B shows the following. This figure shows the range of the adhesive area BA and non-adhesive area NB. As described above, as shown in FIG. 4, this cable corner bending buffer is constructed by partially adhering the sealing material 4 to the two-split elastomer support 2 (see FIG. 5), as shown in the perspective view. The two elastomer supports 2 are combined and compressed and fixed by sandwiching the cable 1 and fitting the tip of the lip 2b of the elastomer support 2 into the fitting groove 4a of the sealing material 4. The synthetic resin layer 3 is formed by press-fitting a liquid synthetic resin into the gap inside the body part 2a through an injection port and hardening it to form a sealed state. [Effect of the invention] As mentioned above, this cable corner bending buffer has the function described in the function section, so that the initial stable setting state of the seal portion in the lip portion is maintained for a long period of time, and the elastomer foam The body of the elastomer support is integrally bonded to the elastomer support by a filled and cured synthetic resin layer, and the body of the elastomer support exhibits an appropriate integral cushioning effect in the composite. In addition, it provides a long-term cable corner bending buffer.

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional view of the cable corner bending buffer device of this invention when the cable is set at the center position, and Figure 2 is a longitudinal sectional view of the device when the cable is set at the eccentric position. , Figure 3-A is
A plan view of the elastomer foam sealing material used in this invented device, and FIG. 3-B is a side view of the same. FIG. 4 is a perspective view showing a combined state of the elastomer support and the sealing material divided into two parts, FIG. 5-A is a plan view of the elastomer support, and FIG.
B is a side view of the same side, FIG. 6 is a partially sectional front view of a conventional cable corner bending buffer, FIG. 7 is a sectional view taken along the - line in FIG. 6, and FIG. FIG. 9 is a vertical cross-sectional view of the cable shown in FIG. 8 when the cable is set in an eccentric state. It is a diagram. 1... Cable, 2 ... Elastomer support,
2a...Body portion, 2b...Lip portion, 3...Synthetic resin layer, 4 ...Sealing material, 4a...Fitting groove, 5...
Split support bracket.

Claims (1)

[Scope of utility model registration request] In a shock absorbing device in which a cable is fixed to a split elastomer support using a split support fitting via a synthetic resin layer, the elastomer support has a cylindrical body and both ends thereof form an inclined small diameter part. The tip of the lip has a length that forms a gap that does not come in contact with the cable, and the lip is joined to the fitting groove of the open-cell elastomer foam sealing material. The space between the inner surface of the body and the cable is bonded with a synthetic resin layer in which liquid synthetic resin is injected and hardened, and the lip is made of a composite of elastomer foam and penetrating synthetic resin. Seal mechanism of cable corner bend buffer device connected at.