JP4924968B2 - Concrete plate height adjusting device and height adjusting method - Google Patents

Description

  The present invention relates to a concrete plate height adjusting device and a height adjusting method for correcting partial settlement of a road surface or the like paved by a concrete plate and flattening the entire road surface or the like.

A conventional method for adjusting the height of a concrete plate has been performed as follows (for example, see Patent Document 1). That is , as shown in FIG. 5 (a), a straight hole 4 is made by penetrating vertically in a concrete plate 2 laid on a foundation roadbed 1 with a core cutter 3.

Next, as shown in FIG. 5 (b), the foundation roadbed 1 under the straight hole 4 is excavated through the straight hole 4 to form a concrete slab work space 5 larger than the inner diameter of the straight hole 4.

Next, as shown in FIG. 5C , a reaction force receiving portion 6 is formed on the bottom surface of the concrete slab work space 5 by placing concrete.

Next, as shown in FIG. 5 (d), a jack mounting bracket 7 is mounted on the inner periphery of the straight hole 4 and fixed with an adhesive, and a stress transmission member 8 is mounted on the reaction force receiving portion 6 at the center. Install.

For example, as shown in FIGS. 7 and 8 , the jack mounting bracket 7 includes a cylindrical portion 9 positioned in the straight hole 4, and a concrete plate 2 below the concrete plate 2 in the work space 5 under the concrete plate from the outer periphery of the lower end of the cylindrical portion 9. And an overhanging portion 10 that protrudes from the surface. As shown in FIG. 8, the overhanging portion 10 is formed in an annular recess 9 b on the outer periphery of a ring 9 a in which a divided piece 10 a obtained by dividing a disk is screwed into a lower end of the cylindrical portion 9 in the work space 5 under the concrete plate And are integrated by welding between the divided pieces 10a and between the divided pieces 10a and the ring 9a. In FIG. 98 , 11 is a welding part. Further, the stress transmission member 8 is formed in a disc shape, and a plurality of upper ends are stacked at a height to be inserted into the cylindrical portion 9 of the jack mounting bracket 7 while being placed on the reaction force receiving portion 6 to form a columnar shape. .

  The jack mounting bracket 7 has a female thread 12 engraved on the inner surface of the cylindrical portion 9, and a ring-shaped lock nut 13 with a male thread engraved on the outer periphery thereof.

The jack mounting bracket 7 and the stress transmitting member 8 configured as described above are mounted in each straight hole 4 to complete the preparation work . Next, as shown in FIGS. 6 (e) and 6 (f), a hydraulic jack 14 is used. The concrete plate 2 is lifted up. In the lifting operation, the lower portion of the hydraulic jack 14 is screwed onto the upper portion of the cylindrical portion 9 in FIG. 7 , the hydraulic jack 14 is actuated to project the compression rod 15, and the reaction force receiving portion 6 is projected at the tip of the compression rod 15. Is pressed to lift the concrete plate 2 as shown in FIG . Thereby, the clearance gap 16 between the foundation roadbed 1 and the concrete plate 2 is formed.

After the concrete plate 2 is lifted in this way, a filler 17 such as sand or cement mortar is placed in the gap 16 between the base roadbed 1 and the concrete plate 2 as shown in FIG. Separately, it is injected with a hose from an injection hole 18 opened in the concrete plate 2.

In this state, with the jack fitting 7 and the stress transmission member 8 left in the straight hole 4, the straight hole 4 is covered and the operation is completed.
Japanese Patent Publication No. 8-6284

  However, in such a method for adjusting the height of the concrete plate, since the jack mounting bracket 7 is fixed with an adhesive in the straight hole 4 of the concrete plate 2, it is adhered when the concrete plate 2 is lifted by the hydraulic jack 14. There was a problem that a large lifting force could not be applied due to the adhesive strength of the agent and cracking of the concrete plate 2. In addition, this method requires the work of excavating the foundation roadbed 1 below the straight hole 4 through the straight hole 4 to form the concrete lower work space 5 larger than the inner diameter of the straight hole 4. There was a problem that took time.

  An object of the present invention is to provide a concrete plate height adjusting device and a height adjusting method capable of preventing the adhesive strength of the adhesive in the straight hole, cracking of the concrete plate, etc. during the lifting operation of the concrete plate with a hydraulic jack. There is to do.

  Another object of the present invention is to provide a method for adjusting the height of a concrete plate that can omit the work of forming a work space under the concrete plate larger than the inner diameter of the straight hole in the foundation roadbed under the straight hole of the concrete plate. is there.

  Another object of the present invention is to provide a method for adjusting the height of a concrete plate that can easily form a reaction force receiving portion for a foundation roadbed under the concrete plate.

  In order to solve the conventional problems as described above and achieve the intended purpose, the feature of the invention described in claim 1 is that a concrete plate laid on a foundation roadbed is vertically perforated. A jack is attached using this hole, and a concrete plate height adjusting device for adjusting the height of the concrete plate by lifting the concrete plate by pressing the base roadbed side with the jack,

The through hole of the concrete plate is formed as a tapered hole having a small diameter and increasing in diameter toward the back, and in the tapered hole, a tapered surface having a small diameter on the upper side of the outer peripheral surface and increasing in diameter toward the lower side. The tapered cylindrical body is inserted, the tapered cylindrical body is fixed to the inner surface of the tapered hole with an adhesive, and the jack is attached to the tapered cylindrical body.

  According to a second aspect of the present invention, in addition to the configuration of the first or second aspect, a distal end portion of a hydraulic jack is connected to a center hole of the tapered cylindrical body, and a distal end portion of a compression rod of the hydraulic jack is It exists in being supported by the reaction force receiving part on the base roadbed side.

  A feature of the invention described in claim 3 is that a concrete plate laid on the foundation roadbed is vertically penetrated to form a hole, and a jack is attached using the hole, and the jack is attached to the foundation roadbed side. A concrete plate height adjustment method for adjusting the height of the concrete plate by pressing the concrete plate, wherein a taper hole is formed in the concrete plate so that the diameter of the entrance decreases and the diameter increases toward the back. A taper hole forming step, and a taper cylinder having a taper surface having a smaller diameter on the upper side of the outer peripheral surface and a larger diameter toward the lower side in the taper hole. A taper cylinder fixing step of fixing the inner surface of the taper hole of the concrete plate with an adhesive, and connecting the tip of the jack to the inlet of the center hole of the taper cylinder, thereby compressing the jack. The distal end portion of the rod is supported in a counter-force receiving portion of said base roadbed side, is protruded to the compression rod lies in and a step lifting the concrete lifting the concrete panel.

  According to a fourth aspect of the present invention, in addition to the configuration of the fourth aspect, in the tapered hole forming step, straight holes having the same inner diameter are formed in the concrete plate and the base roadbed, and the straight of the concrete plate is formed. The hole is processed to become the tapered hole so that the diameter becomes larger from the entrance toward the back, and the reaction force receiving portion is formed in the straight hole of the base roadbed by placing a reaction force receiving filler. It is in.

  The effects of the present invention will be described as follows.

  In the concrete plate height adjusting apparatus of the present invention, the lifting force of the concrete plate by the jack is received through the tapered cylinder in the tapered hole, the diameter of the concrete plate entrance is small and the diameter increases toward the back. Since the taper surface of the tapered cylinder has a smaller diameter on the upper side and becomes a larger diameter toward the lower side, the lifting force is reliably transmitted through the taper surface when lifting the concrete plate with the jack. There is no problem of cracking of the concrete plate during lifting without special reinforcement around the taper hole for jacking the concrete plate, and a large lifting force can be achieved by installing a compact tapered cylinder Can be transmitted.

  Further, by fixing the tapered cylinder with an adhesive on the inner surface of the tapered hole, it is possible to easily install the tapered cylinder at a desired lifting position with respect to the existing concrete plate. In this case, since the tapered cylinder is installed in the tapered hole, a large lifting force can be transmitted by installing a compact tapered cylinder without causing insufficient adhesive force due to the adhesive.

  In the concrete plate height adjusting method of the present invention, a taper hole is formed in the concrete plate so that the inlet has a small diameter and the diameter increases toward the back, and the upper side of the outer peripheral surface has a small diameter in the taper hole. The taper cylinder having a tapered surface that becomes larger in diameter toward the lower side is disposed, and the taper cylinder is fixed to the inner surface of the taper hole of the concrete plate with an adhesive. Since the tip of the jack is connected, the tip of the compression rod of the jack is supported by the reaction force receiving portion on the base roadbed side, and the concrete plate is lifted by protruding the compression rod, the concrete plate is lifted by the jack. The lifting force at the time is received via an adhesive on the tapered surface of the tapered cylinder in the tapered hole, the diameter of the concrete plate entrance is small and the diameter increases toward the back. The upper surface has a smaller diameter on the upper side and a taper surface with a larger diameter toward the lower side. Therefore, there is no problem such as insufficient adhesive strength of the adhesive, and the concrete plate is lifted with a jack. The problems such as adhesive strength of the adhesive in the taper hole and cracking of the concrete plate are eliminated, and the concrete plate can be lifted with a large lifting force.

  In addition, in the taper hole forming process, straight holes with the same inner diameter are formed in the concrete plate and the foundation roadbed, and the straight holes in the concrete plate are processed into taper holes that become larger in diameter from the entrance to the back. If the reaction force receiving part is formed in the straight hole of the concrete by placing concrete, it will be troublesome to form a work space under the concrete plate larger than the inner diameter of the straight hole in the foundation roadbed under the straight hole of the concrete plate as before. Can be omitted. Further, since the reaction force receiving filler is placed at the bottom of the straight hole to form the reaction force receiving portion, the reaction force receiving portion for the foundation roadbed under the concrete plate can be easily formed.

  BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the best mode for carrying out a concrete plate height adjusting device and a height adjusting method according to the present invention will be described in detail with reference to FIGS. In addition, the same code | symbol is attached | subjected and shown to the part corresponding to FIGS. 6-9 mentioned above.

  FIG. 1 is a longitudinal sectional view showing a concrete plate height adjusting device of this example. In the concrete plate height adjusting apparatus of this example, the concrete plate 2 is formed with a tapered hole 19 having a small diameter and an increasing diameter toward the back. In the taper hole 19, a metal taper cylindrical body 20 having a tapered surface whose upper diameter on the outer peripheral surface has a small diameter and becomes larger toward the lower side is disposed. The tapered cylinder 20 is fixed to the inner surface of the tapered hole 19 of the concrete plate 2 with an adhesive 21. The tip of the jack chair 23 is connected to the entrance of the center hole 20 a of the tapered cylinder 20. The jack chair 23 is connected to the tip of the hydraulic jack main body 22, and the cylindrical compression rod 15 projects from the hydraulic jack main body 22 through the hole of the cylindrical jack chair 23. The distal end portion of the compression rod 15 of the hydraulic jack 14 is in contact with the stress transmission member 8 installed on the reaction force receiving portion 6 on the basic roadbed 1 side. The stress transmission member 8 is composed of a plurality of short cylindrical blocks, stacked at a required height, and supports the distal end portion of the compression rod 15 on the reaction force receiving portion 6.

  Next, the manufacture of the concrete plate height adjusting apparatus and the concrete plate height adjusting method will be described with reference to FIGS. 1 and 2A to 2F.

  As shown in FIG. 2A, straight holes 4 having the same inner diameter are formed in the concrete slab 2 and the underlying roadbed 1. The excavation length of the straight hole 4 with respect to the basic roadbed 1 depends on the material of the basic roadbed 1 but is about 30 to 60 cm.

  Next, as shown in FIG. 2 (b), the straight hole 4 of the concrete plate 2 is processed into a tapered hole 19 so that the diameter increases from the entrance to the back (taper hole forming step). The process of making the straight hole 4 into the tapered hole 19 is performed, for example, by inserting a taper cutter into the straight hole 4 and rotating the taper bit in the horizontal direction while rotating the taper bit. This is done by cutting so that the amount of shaving at the back of is the largest and the amount of shaving decreases as it approaches the entrance.

  Next, as shown in FIG. 2 (c), a reaction force receiving portion 6 is formed in the straight hole 4 of the base roadbed 1 by placing a reaction force receiving filler such as concrete or non-shrink mortar. After the reaction force receiving portion 6 is formed and solidified, as shown in FIG. 2C, the outer peripheral surface of the tapered hole 19 becomes a tapered surface whose upper diameter is smaller and the diameter becomes larger as it goes downward. The taper cylinder 20 is inserted. The outer diameter of the lower end of the tapered cylinder 20 is slightly smaller than the inner diameter of the inlet that is the smaller diameter of the tapered hole 19, and can be easily inserted from the inlet of the tapered hole 19.

  As shown in FIG. 2 (d), an adhesive 21 is filled in the gap between the inner surface of the tapered hole 19 and the outer peripheral surface of the tapered cylindrical body 20. In this operation, the tapered cylindrical body 20 is inserted into the tapered hole 19 and is positioned substantially at the center of the tapered hole 19, and the packing 40 shown in FIG. 1 is interposed between the lower ends of the tapered hole 19 and the tapered cylindrical body 20, Although not shown in the drawing, a positioning jig is inserted from the outside of the taper hole 19 to temporarily hold it, and the adhesive 21 is injected in the other state and cured for a predetermined time. Then, the tapered cylinder 20 is fixed (taper cylinder fixing step).

  Next, as shown in FIG. 2 (e), the stress transmission member 8 is inserted into the center hole 20a of the tapered cylindrical body 20 and stacked on the reaction force receiving portion 6 to a required height, and above the center hole 20a. The lower part of the jack chair 23 of the hydraulic jack 14 is screwed. As described above, the hydraulic jack body 22 is rotatably connected to the upper portion of the jack chair 23.

  In this state, as shown in FIG. 2 (f), the compression rod 15 of the hydraulic jack 14 is protruded and applied to the stress transmission member 8 on the reaction force receiving portion 6 to lift the concrete plate 2 by the reaction force (concrete) Plate lifting process). The tip of the compression rod 15 does not need to be brought into contact with the reaction force receiving portion 6 and the stress transmission member 8 is not interposed.

  Thereafter, in the same manner as shown in FIG. 7G, the filler 17 such as sand or cement mortar is placed in the gap 16 between the foundation roadbed 1 and the concrete plate 2 and the concrete plate 2 separately from the straight holes 4. It injects with a hose from the injection hole 18 opened to the inside.

  In such a concrete plate height adjusting device, the lifting force during the lifting operation of the concrete plate 2 by the hydraulic jack 14 is such that the entrance of the concrete plate 2 is small in diameter and increases in the taper hole 19 which becomes larger in diameter toward the back. The taper surface of the taper cylinder 20 is received via the adhesive 21, and the taper surface of the taper cylinder 20 has a smaller diameter on the upper side and a taper surface that increases in diameter toward the lower side. There is no problem such as insufficient adhesive strength, and there are no problems such as adhesive strength of the adhesive 21 in the taper hole 19 or cracking of the concrete plate 2 when lifting the concrete plate 2 with the hydraulic jack 14, and a large lift The concrete plate 2 can be lifted by force.

  Further, in such a method of adjusting the height of the concrete slab, the taper hole 19 is formed in the concrete slab 2 so as to penetrate into the concrete slab 2 so that the diameter of the inlet becomes smaller and deeper toward the back. A taper cylinder 20 having a smaller diameter on the upper side and a taper surface increasing toward the lower side is disposed, and the taper cylinder 20 is fixed to the inner surface of the taper hole 19 of the concrete plate 2 with an adhesive 21. The tip of the hydraulic jack 14 is connected to the inlet of the center hole 20 a of the tapered cylinder 20, and the tip of the compression rod 15 of the hydraulic jack 14 is connected to the stress transmission member 8 on the basic roadbed 1 side reaction force receiving portion 6. Since the concrete plate 2 is lifted by protruding the compression rod 15 of the hydraulic jack 14, the lifting force when the concrete plate 2 is lifted by the hydraulic jack 14 is raised. The taper surface of the taper cylinder 20 in the taper hole 20 inside the taper hole 19 that has a small diameter toward the back and the diameter of the entrance of the concrete plate 2 is received via an adhesive 21. The taper surface has a diameter that increases toward the lower side. Therefore, problems such as insufficient adhesive strength of the adhesive 21 are eliminated, and a taper hole is provided when the concrete plate 2 is lifted by the hydraulic jack 14. The problems such as the adhesive strength of the adhesive 21 in 19 and the crack of the concrete plate 2 are eliminated, and the concrete plate 2 can be lifted with a large lifting force.

  Further, in the taper hole forming step, straight holes 4 having the same inner diameter are formed in the concrete plate 2 and the foundation roadbed 1, and the straight holes 4 of the concrete plate 2 are formed as taper holes 19 having a diameter that increases from the entrance toward the back. Since the reaction force receiving portion 6 is formed in the straight hole 4 of the foundation roadbed 1 by placing the reaction force receiving filler, the foundation roadbed 1 under the straight hole 4 of the concrete plate 2 is conventionally formed. Furthermore, the troublesome work of forming the concrete work space 5 below the inner diameter of the straight hole 4 can be omitted. In addition, since the reaction force receiving filler is placed at the bottom of the straight hole 4 to form the reaction force receiving portion 6, the reaction force receiving portion 6 with respect to the foundation roadbed 1 under the concrete plate 2 can be easily formed. be able to.

  In the present invention, when the material of the basic roadbed 1 is hard, the straight hole 4 can be formed only on the concrete plate 2 and the hard basic roadbed 1 can be used as the reaction force receiving portion 6 as it is.

  FIG. 3 is a longitudinal sectional view showing a configuration of an example of a taper hole processing apparatus that performs processing using the straight hole 4 as the taper hole 19. In this apparatus, a conical cutter 31 having a large number of concrete cutting bits 30 projecting on a tapered peripheral surface is fixed to a rotation shaft 34 of a rotation drive device 33 installed on a swivel base 32. The swivel base 32 is provided with a swivel turn rotation gear 35 on its lower surface, and the swivel turn 32 is rotated in the circumferential direction by rotating the swivel turn rotation gear 35 by a turn drive motor 36. Yes.

  In the taper hole forming step, the conical cutter 31 is inserted into the straight hole 4 as shown in FIG. 4A, and the swivel base 32 is moved in the radial direction as shown in FIG. After the conical cutter 31 is pressed against the inner surface of the straight hole 4 and cut to a desired cutting depth, the swivel base 32 is swung, and the conical cutter 31 is moved into the straight hole 4 as shown in FIG. The straight hole 4 is processed into a tapered hole 19 by moving in the circumferential direction along the peripheral surface.

  Although not shown in the drawing, a straight cylindrical cutter may be used, and a straight hole may be processed into a tapered hole by conical movement.

  In each of the above-described embodiments, a hydraulic jack is used as a jack for lifting the concrete plate. This jack is fixed to the tapered cylinder and takes a reaction force against the reaction force receiving portion under the concrete plate. Any structure can be used as long as it can lift the concrete plate, and it can be hydraulic, mechanical or manual.

It is a longitudinal cross-sectional view which shows an example of the height adjustment apparatus of the concrete plate which concerns on this invention. (A)-(f) is each process drawing which shows an example of the height adjustment method of the concrete plate which concerns on this invention. It is the top view and longitudinal cross-sectional view which show the structure of an example of the taper hole processing apparatus which performs the process which makes the straight hole used by the method of this invention a taper hole. It is a schematic diagram which shows a taper hole processing state same as the above. (A)-(d) is sectional drawing which shows the process until the jack attachment of an example of the height adjustment method of the conventional concrete plate. (E)-(g) is sectional drawing which shows the process after the jack attachment same as the above. It is an enlarged view of the process of FIG. It is a top view of the jack mounting bracket used in the prior art example shown in FIG.

DESCRIPTION OF SYMBOLS 1 Foundation roadbed 2 Concrete plate 3 Core removal cutter 4 Straight hole 5 Work space under concrete plate 6 Reaction force receiving part 7 Jack mounting bracket 8 Stress transmission member 9 Cylindrical part 10 Overhang part 14 Hydraulic jack 15 Compression rod 16 Gap 17 Filler 18 Injection hole 19 Taper hole 20 Taper cylinder 20a Center hole 21 Adhesive 22 Hydraulic jack body 23 Jack chair 30 Concrete cutting bit 31 Conical cutter 32 Rotating table 33 Rotating drive 34 Rotating shaft 35 Rotating table rotating gear 36 Rotating drive Motor 40 packing

Claims (4)

A hole is drilled up and down in the concrete plate laid on the foundation roadbed, and a jack is attached using this hole, and the concrete plate is lifted by pressing the foundation roadbed side with the jack. A concrete plate height adjusting device for adjusting the height,
The through hole of the concrete plate is formed as a tapered hole having a small diameter and increasing in diameter toward the back, and in the tapered hole, a tapered surface having a small diameter on the upper side of the outer peripheral surface and increasing in diameter toward the lower side. The tapered cylindrical body is inserted, the tapered cylindrical body is fixed to the inner surface of the tapered hole with an adhesive, and the jack is attached to the tapered cylindrical body. Concrete plate height adjustment device.   The tip of a hydraulic jack is connected to the center hole of the tapered cylindrical body, and the tip of a compression rod of the hydraulic jack is supported by a reaction force receiving portion on the base roadbed side. The concrete plate height adjusting device described in 1. A hole is drilled up and down in the concrete plate laid on the foundation roadbed, and a jack is attached using this hole, and the concrete plate is lifted by pressing the foundation roadbed side with the jack. A method for adjusting the height of a concrete plate to adjust the height,
A taper hole forming step in which a taper hole is formed in the concrete plate so that the diameter of the taper hole becomes smaller and deeper toward the back, and the upper side of the outer peripheral surface of the taper hole has a smaller diameter and goes downward. A tapered cylinder fixing step of arranging a tapered cylinder having a tapered surface having a large diameter and fixing the tapered cylinder to the inner surface of the tapered hole of the concrete plate with an adhesive; and Concrete in which the tip of the jack is connected to the entrance of the center hole, the tip of the compression rod of the jack is supported by the reaction force receiving portion on the base roadbed side, and the compression rod is projected to lift the concrete plate A method for adjusting the height of a concrete plate, comprising a plate lifting step.   In the taper hole forming step, straight holes having the same inner diameter are formed in the concrete plate and the base roadbed, and the straight hole of the concrete plate is formed as the taper hole so that the diameter increases from the entrance toward the back. The method for adjusting the height of a concrete plate according to claim 4, wherein the reaction force receiving portion is formed by placing a reaction force receiving filler in a straight hole of the foundation roadbed.

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