JPS6254760B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flat jack used for raising or adjusting the position of structures such as bridges, and a method for manufacturing an expandable rubber body used for the flat jack.

Generally, a structure such as a bridge is composed of a bridge pier B and a bridge girder G disposed on the pier B via a support S, as shown in FIG.

In these structures, adjustments or maintenance replacements during installation of the bearings S that support the bridge girders G, as well as adjustments to the bridge girders G due to uneven ground subsidence, are carried out by lifting the bridge girders G with jacks H. However, in a structure where the distance between the bridge girder B and the bridge girder G is narrow, the piston type jack H that has been used conventionally has a problem that it is difficult to apply because of its large height. In order to solve such problems,
- In No. 116773, a small flat jack with a simple structure that does not use a piston can generate the same large force as a conventional piston type, and can be applied to structures with narrow spaces, that is, a base with a pot-shaped recess formed on the top surface. a bag-shaped rubber body having a cap with an injection hole formed therein and housed in the pot-shaped recess of the base body; and a pressure bearing plate having a convex spherical surface formed on the periphery of one end disposed on the bag-shaped rubber body. The mouthpiece of the bag-like rubber body is fitted into a recess formed on the bottom surface of the pot-shaped recess of the base body and connected to the outer surface of the base body through a communicating hole, so as to be tightly housed in the pot-shaped recess, By filling the bag-like rubber body with viscous fluid through the communication hole of the base,
We proposed a flat jack that lifts up the structure by pushing up the bearing plate.

However, flat jacks tend to cause unevenness in the inner surface shape of the bag-shaped rubber body, especially the wall thickness at the inner peripheral edge, and this problem has been solved, such as the part breaking and pressurized fluid (viscous fluid) leaking. It was left untouched.

In other words, a bag-like rubber body is formed by compression molding a rubber body to form a bag-like shape, so-called a hollow inner surface, but during such molding, the shape of the inner surface, especially when filled with viscous fluid, expands when it expands. It is difficult to form the inner circumferential edge so that the thickness is uniform, and this causes the problem of damage to this portion during repeated use, reducing the performance (life) of the flat jack.

The present invention has been made to solve these problems.

That is, by integrally providing a reinforcing material having a convex curved surface on the periphery at one end of a mouthpiece having an injection hole, and forming the rubber body so that the reinforcing material is enclosed within the rubber body. , a method for manufacturing an expandable rubber body in which the thickness of the inner peripheral edge of the rubber body is uniformly formed using a reinforcing material as a core, and a method for manufacturing an expandable rubber body in which the thickness of the inner peripheral edge of the rubber body is formed uniformly, and the rubber body is densely packed together with a bearing plate in a pot-shaped recess provided in a base body. This provides a flat jack that can be stored.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Reference numeral 1 denotes a flat jack disposed between piers B and G, which includes a base 2, a disc-shaped rubber body 3 that can be expanded by injecting viscous fluid, and a cylindrical bearing plate 4. It is composed of.

Reference numeral 5 denotes a pot-shaped recess with a circular cross section formed on the upper surface of the base 2, and a recess 6 is formed on the bottom surface of the pot-shaped recess 5.
is provided, and the bottom surface of the recess 6 and the outer surface of the base body (in this embodiment, the side surface) are communicated through a communication hole 7.

Reference numeral 8 denotes a screw portion for attaching a pipe, which will be described later, provided on the outer surface side of the communication hole 7.

9 is a cap arranged on one end surface of the rubber body 3;
The mouthpiece 9 has an injection hole 10 in the center thereof into which a viscous fluid is injected, an annular groove 12 in which a seal 11 is disposed on the outer surface of one end, and an annular groove 12 on the outer surface of the other end. A disk-shaped reinforcing member 14 whose peripheral edge is formed into a convex curved surface 13 is fixed integrally.

The cap 9 has one end on the annular groove 12 side projected from the end surface of the rubber body 3, and the fixed reinforcing material 14 is connected to all or part of the lower surface 15 of the reinforcing material and the rubber body 3. They are bonded together with an adhesive 16 and placed inside the rubber body 3. Reference numeral 17 denotes an injection hole 1 of the cap opening in the rubber body 3.
0, and the corresponding plate 17 is integrally bonded to the rubber body 3 with an adhesive 18.

The corresponding plate 17 has the rubber body 3 inserted into the injection hole 10 during molding.
This prevents the inflow of

Reference numeral 19 denotes an annular ring, and the annular ring 19 is connected to an annular stepped portion 2 formed on the periphery of the other end surface of the rubber body 3.
0 is fitted.

21 is a convex spherical surface formed on the peripheral edge of one end of the bearing pressure plate 4.

The structure of the rubber body 3 will become clearer in the manufacturing method of the rubber body 3 described below, but the lower surface 15 of the reinforcing material included in the rubber body 3 and the backing plate 1
7 is integrally bonded to the rubber body 3 by adhesives 16 and 18, but the upper surface of the reinforcing member 14 and the rubber body 3
can be separated by injecting viscous fluid.

Furthermore, there is no fixed relationship between the backing plate 17, the base 9, and the reinforcing material 14.

Therefore, when a viscous fluid is injected into the rubber body 3 through the injection hole 10 of the base, the viscous fluid flows into the reinforcing material 1.
4 and the inner surface of the rubber body 3 and can be expanded into a bag shape.

In FIG. 3, 22 is a viscous fluid, 23 is a pipe for injecting the viscous fluid 22, and the pipe 23 is screwed onto the threaded portion 8 of the base.

Next, a method for manufacturing the expandable rubber body 3 and a procedure for assembling the flat jack 1 using the rubber body 3 will be explained with reference to FIG.

That is, the method for manufacturing the rubber body 3 includes a reinforcing material 14 having a convex curved surface 13 formed on its peripheral edge, and a base 9 having an injection hole 10 having an annular groove 12 at one end.
The other end is fixed and integrally provided by means such as welding (see Fig. 4A), and then a recess Y into which the one end of the cap 9 on the annular groove 12 side is fitted is provided on the bottom surface thereof. A small hole W into which the cap 9 fits is formed in the lower mold Z, and a reinforcing material 14 integrated with the cap 9 is formed, and an adhesive 16 is coated on the entire surface or a part of the reinforcing material 14. A plate-shaped preformed rubber X having the same diameter (herein, preformed rubber refers to one in an unvulcanized state, hereinafter referred to as rubber material) and a ring-shaped rubber material having a diameter larger than that of the reinforcing material 14. Together with the rubber material X' (see Fig. 4B), the surface of the plate-shaped rubber material A material X' is arranged so as to surround these [see Fig. 4 C], and a plate-shaped rubber material X'' having approximately the same diameter as the reinforcing material 14 is placed on the reinforcing material 14 and inside the injection hole 10 of the mouthpiece. A patch plate 17 coated with adhesive 18 on one side to prevent the plate-shaped rubber material
And the surface to which the adhesive 18 was applied is a plate-shaped rubber material.
The plate-shaped rubber material X" is arranged so as to be connected to the ring-shaped rubber material [See Figure 4] [See Figure 4].

Specifically, by compression molding, the upper surface of the reinforcing material 14 and the rubber material
The whole or part of the lower surface 15 of 4 and the rubber material X
The backing plate 17 and the rubber material X'' are bonded together, and the respective rubber materials X,
X′,
is manufactured.

Here, the plate-shaped rubber materials X and X″ are reinforcing materials 14
The ring-shaped rubber material X′ was formed so as to have approximately the same diameter as the
The reinforcing material 14 is formed by forming the plate-shaped rubber materials X, X'' larger than the diameter of the reinforcing material 14, and by sandwiching the ring-shaped rubber material X' between the plate-shaped rubber materials X, X''.
There is no problem in forming it so as to surround it.

Further, although the rubber body 3 is formed using plate-shaped and ring-shaped rubber materials X, X', and X'', it is also possible to form it using a rubber material made of rubber powder. be.

The flat jack 1 has a bearing plate 4 having a convex spherical surface 21 formed on the peripheral edge of the rubber body 3 and a pan-shaped recess 5 formed on the upper surface, and an outer surface (side surface) on the bottom surface of the pan-shaped recess 5. Concave portion 6 connected by communication hole 7
It is constructed by combining the base body 2 provided with the annular link 19 and the seal 11 (see FIG. 4-d) [see FIG. 4-d].

To be more specific, the rubber body 3 has a seal 11 fitted in the annular groove 12 of the base protruding from the rubber body 3 into the pot-shaped recess 5 of the base body, and an annular link 19 fitted in the stepped portion 20. A recess 6 provided on the bottom surface of the pot-shaped recess 5
Then, the injection hole 10 and the communication hole 7 are aligned with the mouthpiece 9, and the seal 11 fitted in the annular groove 12 is brought into contact with the side surface and fitted, and the annular ring 19 is fitted.
The fitted surface is positioned on the opening side of the pot-shaped recess 5 and is tightly housed.

Next, the bearing pressure plate 4 is placed on the rubber body 3 so that its convex spherical surface 21 is in contact with the vertical wall of the pan-shaped recess 5 and the other surface protrudes from the opening end of the pan-shaped recess 5, in other words, the upper surface of the base 2 It is constructed by arranging it so that it protrudes more.

The flat jack 1 configured in this manner has a pipe 23 connected to a pump (not shown) screwed onto the threaded portion 8 of the base body 2, and the viscous fluid 22 from the pump is passed through the pipe 23 and the communication hole 7 to the base. The upper surface of the reinforcing material 14 and the rubber body 3 from the injection hole 10 of
By filling between the inner surfaces of the rubber body 3, the rubber body 3 is swelled upward within the pot-shaped recess 5 of the base, and the bearing plate 4
It is operated to generate a large force that lifts up the structure. It should be noted that, when the structure is lifted up, a slight inclination of the structure is caused by the bearing plate 4 following the inclination within the pot-shaped recess 5 of the base body around its convex spherical surface 21. damage is to be prevented.

Furthermore, during the lifting operation, the protrusion of the annular ring 1 fitted into the stepped portion 20 of the rubber body from the vertical wall of the pot-shaped recess 5 of the rubber body 3 and the convex spherical surface 21 of the bearing pressure plate is
This is regulated under Section 9.

By manufacturing the rubber body 3 in this way, the rubber body 3
Since the reinforcing material 14 can be formed uniformly by using the reinforcing material 14 as a core mold, the thickness of the inner peripheral edge where damage is likely to occur can be prevented, and the molding workability can also be improved.

Also, using the rubber body 3, the flat jack 1
This configuration allows for a simpler and more compact structure than conventional piston-type ones, making it easier to handle during maintenance and adjustment work on the structure, and preventing damage to the rubber body even during repeated use. Since this is prevented, its performance can be maintained.

In this embodiment, a reinforcing material 1 is provided at one end of the cap 9.
4 is manufactured separately from the cap 9 and fixed together by welding or the like, but it is also possible to manufacture the cap 4 integrally with the cap 9 from the beginning without making it a separate body. Furthermore, although the reinforcing material 14 is illustrated as being plate-shaped, these reinforcing materials 14 may be formed by supporting a ring material having a circular or semicircular cross section, which can form a convex curved surface 13 on the peripheral edge, radially on the base 9 with ribs. It is also possible to adopt a mode in which the material is fixed to the surface.

Furthermore, although the flat jack 1 has been described in which the pot-shaped recess 5 of the base, the rubber body 3, the reinforcing material 14 included in the rubber body 3, and the bearing pressure plate 4 are circular, a mode in which these are square shaped is also possible. Furthermore, the rubber body 3, the lower surface 15 of the reinforcing material, and the backing plate 17 are integrated with adhesives 16 and 18, respectively, but an adhesive (vulcanizing agent) is added to the rubber material forming the rubber body 3 and molded. In some cases, it is also possible to integrate them without using adhesives 16 and 18.

In this embodiment, a release agent is applied to the surfaces other than the adhesive surfaces of the reinforcing material 14 and the backing plate 17 so that the rubber body 3 has an inflatable bag shape. In addition, the flat jack 1 is operated using the viscous fluid 22 to perform maintenance and adjustment of the structure.
For example, using epoxy resin, the resin is filled in the rubber body 3 in a liquid state so as to adjust the position, and then hardened, and the flat jack 1 is left as it is between the structures to perform the adjustment. It is also possible to take other forms.

The present invention has the above-mentioned configuration, and by using a rubber body, it is possible to generate a large force with a simple structure, and it is also smaller in size than the conventional piston type, making handling and maintenance adjustment work easier. It is something.

In addition, by manufacturing the rubber body with reinforcing material inside, the thickness of the inner peripheral edge can be made uniform, so the performance of the flat jack can be maintained over a long period of time, and manufacturing is also easy. It is effective.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the structure of the structure, FIG. 2 is a partially longitudinal front view showing the flat jack of the present invention, and FIG. 3 is a partially longitudinal front view of the flat jack of the present invention in an operating state. FIGS. 4A to 4G are explanatory diagrams showing the flat jack of the present invention and the method for manufacturing an expandable rubber body used in the flat jack. DESCRIPTION OF SYMBOLS 1... Flat jack, 2... Base body, 3... Rubber body, 4... Bearing plate, 5... Pan-shaped recessed part, 6... Recessed part, 7...
Communication hole, 9...cap, 10...injection hole, 13...convex curved surface, 14...reinforcement material, 15...bottom surface.

Claims (1)

[Scope of Claims] 1. A base body having a pot-shaped recess formed on the upper surface, an expandable rubber body having a cap having an injection hole and housed in the pot-shaped concave part of the base body, and disposed on the rubber body. In the flat jack, the base body is provided with a concave portion connected to the outer surface of the base body through a communication hole at the bottom of the pot-shaped concave portion, and the rubber body has one end protruding from the rubber body. It is integrally fixed to the other end of the cap and is formed by enclosing a reinforcing material whose peripheral edge is formed into a convex curved surface, and the injection hole of the rubber body matches the communication hole in the pot-shaped recess of the base. The flat jack is tightly housed by fitting the cap into the recess, and has a bearing plate disposed on the rubber body with one side protruding from the pot-shaped recess. 2 A reinforcing material having a convex curved peripheral edge is integrally fixed to one end of a cap having an injection hole, and a recess into which the other end of the cap is fitted is formed on the bottom surface. A reinforcing material is placed in the lower mold together with a rubber material so that the lower surface of the reinforcing material is in contact with the rubber material, and then a rubber material is placed on and around the reinforcing material so as to surround the reinforcing material, and then the upper mold is placed. By compression molding with a mold, the rubber material is integrated to form a rubber body, and the reinforcing material is encapsulated within the rubber body by joining all or part of the lower surface thereof to the rubber body, and a method for producing an expandable rubber body used in a flat jack, which comprises making the other end of the base protrude from the rubber body.