JPH0240093Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention maintains the distance between the retaining wall and the upright which is enlarged by the extension action of the jack in order to apply a preload to the retaining wall. This invention relates to a spacing device.

(Prior art) In order to support the retaining wall on which the earth pressure and water pressure of the surrounding ground act during root cutting, a plurality of jacks are arranged between the retaining wall and the uprights that constitute the supporting frame. By operating the jack, a preload is applied to the retaining wall.

In order to maintain this load state, conventionally, a threaded rod is used, one end of which abuts against the retaining wall and the other end extends through the upright, and the threaded rod is threaded between the retaining wall and the upright. A combined nut is used (see Japanese Patent Application Laid-open No. 193625/1983).

The threaded rod and nut assembly is arranged on both sides of each jack, and after the jack is actuated, the nut is moved until it abuts against the upright, thereby increasing the distance obtained by the actuation of the jack. is maintained.

By the way, if you increase the amount of action of the jack and increase the distance between the retaining wall and the upright, a larger amount of preload can be obtained.
On the other hand, a threaded rod has the property that its compressive strength decreases as its length (buckling length) increases.

For this reason, when a large preload is applied to the retaining wall, a threaded rod with a large diameter must be used or a large number of threaded rods must be used.

(Purpose) The present invention enables the use of a threaded rod with a small length dimension even when the distance between the retaining wall and the upright is increased in order to obtain a large preload. The purpose is to

(Structure) The spacing device according to the present invention includes: a pair of first side portions parallel to the retaining wall, and a pair of first side portions parallel to the retaining wall, each having a mutual interval that allows the jack in a contracted state to be positioned toward the retaining wall; a frame including a pair of second side portions perpendicular to the side portions of the frame, one end capable of contacting the mountain stop wall, and the other end extending through one first side portion located on the side of the mountain stop wall; a plurality of threaded rods having a plurality of threaded rods, and a nut threaded onto each threaded rod between the locking wall and the frame, the one first side having a hole for allowing the jack to extend; and a through hole for the threaded rod on both sides thereof.

In the present invention, both sides of the hole include the left and right sides of the hole, the upper and lower sides of the hole, and two opposing locations in the diagonal direction.

(Operations and Effects) According to the present invention, after the jack is removed, the preload is applied by a predetermined interval obtained by the action of the jack, so that one end of the threaded rod is brought into contact with the retaining wall and the nut is tightened. is maintained by abutting the threaded rod against one first side, and the threaded rod is subjected to a compressive force equal to the preload.

The length of the threaded rod required to maintain said predetermined spacing is approximately equal to the distance between the retaining wall and one first side. That is, the distance is maintained by using a threaded rod having a length shorter than that of the threaded rod in conventional devices, which required a length approximately equal to the distance between the retaining wall and the upright. be able to.

(Embodiments) The features of the present invention will become clearer from the following description of the illustrated embodiments.

Referring to FIGS. 1 and 2, the spacing device 10 according to the present invention, together with the jack 12, includes a retaining wall 14 and a retaining wall 16 disposed parallel to the retaining wall at a predetermined distance from the retaining wall. is located between. Spacing device 10 and jack 12
are arranged at intervals in the longitudinal direction of the riser 16 (however, only one of them is shown). A supporting frame is provided between the bulwark 16 and another bulwark (not shown) arranged parallel to another bulwark wall (not shown) facing the bulwark wall 14. Constituent struts 18 are arranged.

The illustrated retaining wall 14 is made of aggregate 14 such as H-beam steel.
a and sheet piles 14b, and also includes
is composed of horizontal members such as H-shaped steel.

The spacing device 10 includes a frame 20 (see FIGS. 3 and 4), a plurality of threaded rods 22 each having one end that can come into contact with the retaining wall 14, and a nut 24 screwed onto each threaded rod. Equipped with.

The frame 20 has a pair of first sides 26, 28 parallel to the retaining wall 14 and a pair of second sides 30 orthogonal to the first sides.

The frame 20 shown in FIG. 3 is formed by welding together the first and second side parts made of steel plates, and the frame 20 shown in FIG. 4 is formed by integrally molding concrete or reinforced concrete. There is.

The first and second plate-shaped side portions each have a mutual spacing such that the jack 12 in the contracted state can be positioned toward the retaining wall 14 . That is, the pair of first side portions 26 and 28 have a mutual spacing greater than the length dimension of the jack 12 in the contracted state, and the pair of second side portions 30 have a mutual spacing greater than the diameter of the cylinder portion of the jack 12. has. This results in
The jack 12 in the contracted state can be inserted and placed into the frame 20 between the second sides 30 and removed from the frame 20.

One first side portion 26 located on the side of the retaining wall 14 has a hole 26a that allows one end of the jack 12 to extend toward the retaining wall 14, and a hole 26a on both sides of the hole, in this example. A plurality of through holes 26b for the threaded rods 22 are provided on the left and right sides of the hole 26a.
Further, the other first side portion 28 located on the side of the belly riser 16 has a plurality of bolt holes 32 provided for attaching the frame 20 to the belly riser 16. 16 is provided with a plurality of bolt holes (not shown) that can be aligned with the bolt holes.

Instead of arranging the pair of second side portions 30 at intervals in the longitudinal direction of the riser 16,
As shown in FIG. 5, they can be arranged at intervals in the vertical direction. Further, a plate material (not shown) can be attached to the lower part of the pair of second side parts 30 in the examples shown in FIGS. 1 to 4.
Thereby, when arranging the jack 12, it can be placed on the lower second side portion 30 (FIG. 5) or on the plate material. Further, as shown in FIG. 3, by providing flanges 30a on the upper and lower edges of each of the second side parts 30 and connected to the upper and lower edges of each of the second side parts 30 and connected to both the first side parts 26 and 28, the second can increase the compressive strength of the side parts.

The frame 20 can be placed at the installation position of the jack 12, in the illustrated example at a position facing the aggregate 14a, together with the jack or prior to the installation of the jack. At this time, bolt hole 3
2, and a bolt 34 extending through the bolt hole provided in the rear riser 16, and a nut 3 screwed into the bolt 34.
6 (Fig. 5), raise the frame 20 from the stomach 1
It can be fixed at 6.

When the jack 12 with its other end in contact with the other first side 28 is extended, its one end passes through the hole 26a in the first side of the frame 2.
0 from the inside to the outside, then the mountain stop wall 14
A pressing force, that is, a preload, is applied to this. In this case, as shown in FIG. 5, spacers 38 may be arranged between the jack 12 and the retaining wall 14 and between the jack 12 and the riser 16, respectively. After the jack 12 applies a predetermined preload to the retaining wall 14, its operation is stopped.

After applying a preload by the extension action of the jack 12, one end of the threaded rod 22, which has the other end extending through the through hole 26b in the first side, is connected to the retaining wall 14.
and the retaining wall 14 and the first side portion 2
Nut 2 screwed onto threaded rod 22 between 6 and 6.
4 until it abuts the first side 26.
After that, the jack 12 is contracted and the frame 20 is
The distance retaining device 10 according to the present invention maintains the expanded distance between the retaining wall 14 and the riser 16 after removal from the inside. Each threaded rod 22 used need only have a length slightly larger than the distance between the retaining wall 14 and the frame 20 after the predetermined preload.

In addition, in order to relieve the concentration of the pressing force on the retaining wall 14 by the threaded rod 22, as shown in FIGS. The one end may abut against a retaining wall. Further, the second side portion 30 is
The plate material may be replaced with a plurality of bar materials. Furthermore, the second side 30 is also placed as close as possible to the jack 12 in order to maintain the spacing between the retaining wall 14 and the riser 16 as close as possible to the jack 12 after loading a predetermined preload. It is desirable to arrange the Furthermore, the spacing device 10 is also applicable to a retaining wall (not shown) made of concrete. In this case, it is desirable to embed a steel plate in the area where one end of the threaded rod contacts, thereby preventing damage to the concrete wall.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the spacing device according to the present invention;
2 is a partial longitudinal sectional view taken along line 2--2 of FIG. 1, FIGS. 3 and 4 are enlarged perspective views of the frame, and FIG. 5 is a diagram showing another example of the spacing device. FIG. 2 is a partial vertical cross-sectional view similar to FIG. 2; 10... Spacing device, 12... Jacket, 1
4... Mountain retaining wall, 16... Stand-up, 20... Frame, 22, 24... Threaded rod and nut, 2
6, 28...first side part, 26a, 26b...hole and through hole, 30...second side part.

Claims (1)

[Scope of utility model registration request] A device for maintaining a distance between the jack and the raised wall which is enlarged by the extension action of the jack in order to apply a preload to the jack, the jack being in a contracted state. a frame having a pair of first sides parallel to the retaining wall and a pair of second sides orthogonal to the first side, the frame having a mutual spacing that is positionable toward the wall;
a plurality of threaded rods each having one end capable of contacting the mountain stop wall and the other end extending through one first side located on the side of the mountain stop wall, and between the mountain stop wall and the frame; a nut threaded onto each threaded rod, the one first side having a hole for allowing the jack to extend, and a through hole for the threaded rod on both sides of the hole. .