JPH04237706A - Slab level correcting device - Google Patents

Abstract

PURPOSE:To provide a slab level correcting device, with which execution of floor constructing works can be facilitated, by mounting a hydraulic jack on a flange in advance secured to a slab penetration hole, jacking up the settled bearing ground, and injecting a filling material from a grout pipe which penetrates a piston longitudinally. CONSTITUTION:A flanged pipe 20 is previously fitted in a through hole in each paving slab 1, and under it a concrete board 4 to bear the reaction force and a plate 21 are furnished. When this paving slab 1 has subsided, a pedestal 9 is arranged in the pipe 20 and a hydraulic jack 5 is fixed thereto through the flange part. Pressure oil is supplied into a cylinder tube 22 from an oil pressure lead-in hole 24, and a piston 23 is depressed to press the pedestal 9 to the plate 21, and the paving slab 1 is pulled up by the reaction force acting at this time. A filling material is injected from a grout pipe 27 penetrating the piston 23 longitudinally through a hole 25 in the pedestal 9 into the gap between the slab 1 and the road substrata 2. Thereby ground subsidence can be corrected shortly and easily.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a means for leveling structures such as precast concrete paving slabs.

0002

2. Description of the Related Art As a method for correcting uneven settlement of precast concrete pavement slabs, a method as shown in FIG. 4, for example, is known.

[0003] This involves drilling holes in the submerged pavement slab 1 using a boring machine, placing a concrete slab 4 for reaction force in the roadbed 2, and supporting it on the pavement slab 1 via support fittings 3 as supporting means. When the hydraulic jack 5 presses the concrete plate 4, the reaction force lifts the paving slab 1, and the paving slab 1
The filling material is injected into the gap created between the roadbed 2 and the roadbed 2.

The support fitting 3 consists of a steel pipe 6, a steel plate 7 that supports the steel pipe 6 on the paving slab 1, and a flange-like member 8 that is screwed onto the lower end of the steel pipe 6. The steel plate 7 is divided into fan shapes and inserted into the excavated part of the roadbed 2 through a through hole 1A drilled in the pavement slab 1, and is fastened to the lower end of the steel pipe 6 while being locked to a lock pin 8A by a flange-like member 8. It will be done. A similar fan-shaped rubber pad 12 is interposed between the steel plate 7 and the paving slab 1.

The hydraulic jack 5 drives a piston 23 housed inside a cylinder tube 22 using hydraulic pressure supplied to a port 10. The cylinder tube 22 is supported by the pavement slab 1 by being screwed into the inner circumference of the steel pipe 6, and when the piston 23 presses the base 9 placed on the concrete platen 4 with hydraulic pressure supplied from the outside to the port 10. , the cylinder tube 22 pushes up the paving slab 1 via the support fitting 3 due to the reaction force. Therefore, a filler is injected into the gap created between the jacked up pavement slab 1 and the roadbed 2 through separately formed grout injection holes to support the pavement slab 1 in the raised position. Note that the amount of jacking up is detected by a stroke sensor 11 attached to the hydraulic jack 5.

[0006]

However, since the support fitting 3 has a complicated structure, it is difficult to assemble it below the through hole 1A, and it is necessary to form separate holes for jacking up and grouting. This construction method could not be said to have a sufficiently high work efficiency.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a level adjustment device that has a simple structure and is easy to operate.

[0008]

[Means for achieving the object] The present invention provides a means for supporting a cylinder tube inserted into a through hole formed in a floor slab on the floor slab, and a means for sliding the inside of the cylinder tube in response to hydraulic pressure supplied from the outside. Modification of the deck level with a piston to press the piston, a pedestal placed on the foundation below the deck to be pressed by the piston, and a grout pipe to inject filler into the gap between the deck and the foundation. In the device, the support means is constituted by a flange pipe installed in a through hole in advance, a grout pipe is passed through the piston vertically, and a hole is formed in the pedestal that is continuous with the grout pipe and opens below the floor slab. .

[0009] Furthermore, the supporting means is constituted by a plurality of members each having an arc-shaped cross section that fits into the through hole and a flange portion extending outside the through hole, and the grout pipe is made to extend vertically through the piston, A hole is formed in the pedestal that connects to the grout pipe and opens below the floor slab.

0010

[Function] By supporting the cylinder tube on the flange pipe installed in the through hole in advance, the cylinder tube can be easily supported on the floor slab, and it can also be filled through the grout pipe passed through the piston and the hole in the pedestal. By injecting the filler material, it is possible to inject the filler material through the same through hole as the jack-up.

[0011] Furthermore, by constructing the support means from a plurality of members each having an arcuate cross section that fits into the through hole and a flange portion extending outside the through hole, it is possible to The support means can be easily attached to the through hole.

0012

Embodiments FIGS. 1 to 3 show embodiments of the present invention.

In FIG. 1, a pavement slab 1 is made of precast concrete, and has through holes 1A formed in advance at important points, and a flange pipe 20 as a support means having flanges 20A and 20B at both ends is inserted into the through hole 1A. It is attached around the circumference. Further, a concrete platen 4 for reaction force is placed on the roadbed 2 below the flange pipe 20, and a plate 21 is fixedly installed on the concrete platen 4.

The hydraulic jack 5 has a hollow piston 23 slidably housed inside a cylinder tube 22, and a flange 2 formed at the upper end of the cylinder tube 22.
2A is fixed to the flange 20A of the flange pipe 20 with bolts.

The piston 23 slides downward by hydraulic pressure supplied through the hydraulic pressure inlet 24. 32 is a cylinder tube 20 for guiding the sliding movement of this piston 23.
A guide fixed to the upper end of the piston slides on the inner periphery of the hollow piston 23.

A return spring 26 is interposed between the piston 23 and the cylinder tube 22 to hold the piston 4 in the raised position in a state where the hydraulic pressure is released.

A flange-shaped pressing member 23A is fixed to the lower end of the piston 23. Further, a grout pipe 27 is erected to penetrate the piston 23. grout pipe 27
has its lower end screwed into the inner periphery of the pressing member 23A and opens downward.

The pressing member 23A presses the base 9 placed on the plate 21. Grout pipe 27 on pedestal 9
A hole 25 is formed that opens upward facing the lower end opening. This hole 25 is bent at 90 degrees inside the pedestal 9 and opens at the side surface of the pedestal 9. 31 is grout pipe 2
This is a sealing member attached to the inner periphery of the pressing member 23A to seal the joint between the pressing member 7 and the hole 25.

Opposed to the opening of the hole 25 on the side surface of the pedestal 9, the flange pipe 20 has a notch at the joint with the flange 20B for guiding the filler discharged from the hole 25 downward into the paving slab 1. 28 is formed.

The upper end of the grout pipe 27 protrudes above the paving slab 1, and a grout inlet 29 is provided in the protrusion. Further, a sensing rod 30 is attached to the upper part of the grout pipe 27 in parallel with the grout pipe 27. A position sensor 33 that detects the displacement position of the sensing rod 30 is attached to the cylinder tube 22. Incidentally, the grout pipe 27 and the pedestal 9 are covered with a material to which the filler is difficult to adhere.

Next, the operation will be explained. Normally, the flange pipe 20 is covered with a lid (not shown) so as not to interfere with the use of the paving slab 1.

When correcting the subsidence of the pavement slab 1, the hydraulic jack 5 is transported to the corrected area, the lid is first removed, and the pedestal 9 is
is inserted inside the flange pipe 20 and placed on the plate 21. Next, the flange portion 22A of the hydraulic jack 5 is overlapped with the flange 20A of the flange pipe 20, and tightened with bolts (not shown).

A hydraulic power unit is connected to the hydraulic pressure inlet 24 to supply pressure oil into the cylinder tube 22. The piston 23 is urged downward by this oil pressure, and the pressing member 23A pushes the pedestal 9 onto the plate 2 on the concrete platen 4.
Press it to 1.

The piston 23, which is prevented from being displaced downward by the concrete plate 4 in response to the supply of hydraulic pressure, remains in the same position, while the cylinder tube 22 is displaced upward by the reaction force, and the flange connected with bolts The paving slab 1 is pulled up via the pipe 20.

Since the amount of jacking up of the pavement slab 1 is determined by the position sensor 33, it is sufficient to jack it up until this value matches the target level correction amount.

Next, a grout injection unit is connected to the grout introduction port 29, and filler is injected through the grout pipe 27. The injected filler passes through the hole 25 opened on the side surface of the pedestal 9, passes through the notch 28 of the flange pipe 20, and is filled into the gap between the pavement slab 1 and the roadbed 2.

After the filling is completed and the filler reaches a certain strength, the bolts are removed, the hydraulic jack 5 and the pedestal 9 are removed, and the flange pipe 20 is covered again to complete the level correction of the pavement slab 1. Since the hydraulic jack 5 is fixed to the flange pipe 20, it is easy to install and remove, and since the filling material can be injected through the same through hole 1A as used for jacking up, the level correction work can be completed in a short time.

FIGS. 2 and 3 show another embodiment of the invention, in which the support means are comprised of support members 34 and 35, and the through hole 1A
It is removably attached to the. Support members 34 and 35 are shown in FIG.
As shown in section A on the left side of , there is a middle part with an arcuate cross section that fits into the inner periphery of the through hole 1A between the flange part 34A (35A) and the flange part 34B (35B) extending outside the through hole 1A. 34C (35C).

These support members 34 and 35 are inserted into the through hole 1A immediately before installing the hydraulic jack 5, and
Insert the cylinder tube 22 inside the flange 2
By tightening the cylinder tube 2A to the flange portions 34A and 35A with bolts 36, the cylinder tube 22 is engaged with the wall surface of the through hole 1A, and the cylinder tube 22 is supported on the pavement slab 1.

In this case, when it becomes necessary to correct the level, the pavement slab 1 is drilled to form a through hole 1A, and the hydraulic jack 5 is installed after pouring the concrete plate 4 through the formed through hole 1A. It can also be applied to existing pavements. In addition, the flange portion 34B (35B)
may have a conical shape whose outer diameter gradually increases as shown in section B on the right side of FIG.

[0031]

Effects of the Invention As described above, in the present invention, the means for supporting the cylinder tube on the floor slab is composed of a flange pipe installed in a through hole, and the filler is injected using a grout pipe that extends vertically through the piston. Therefore, when the level needs to be adjusted, a hydraulic jack is fixed to the flange pipe to jack up the slab, and filler is injected from the grout pipe between the slab and the foundation to adjust the level of the slab. It can be easily and quickly corrected.

Furthermore, by using a plurality of members having arcuate cross sections each having a flange portion as the support means, it can be easily applied to an existing floor slab.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a level correction device showing an embodiment of the present invention.

FIG. 2 is a plan view of a support member showing another embodiment.

FIG. 3 is a longitudinal sectional view of a level correction device showing another embodiment.

FIG. 4 is a vertical cross-sectional view of a level correction device showing a conventional example.

[Explanation of symbols]

1 Pavement version 1A Through hole 2 Roadbed 4 Concrete board 5 Hydraulic jack 9 Pedestal 20 Flange pipe 20A Flange 20B Flange 22 Cylinder tube 23 Piston 25 Hole 27 Grout pipe 34 Supporting member 35 Supporting member 34A Flange part 34B Flange part 35A Flange part 35B Flange part

Claims (2)

[Claims] Claim 1: A means for supporting a cylinder tube inserted into a through hole formed in a floor slab on the floor slab, a piston that slides inside the cylinder tube in response to hydraulic pressure supplied from the outside, and a means for pressing the piston. In a deck level modification device comprising a pedestal that is preferably placed on the foundation below the deck and a grouting pipe for injecting a filler into the gap between the deck and the foundation, the support means are Modification of the floor slab level characterized by consisting of a flange pipe attached to a through hole, a grout pipe passing through the piston vertically, and a hole continuous to the grout pipe and opening below the floor slab formed in the pedestal. Device. 2. Means for supporting a cylinder tube inserted into a through hole formed in a floor slab on the floor slab, a piston that slides inside the cylinder tube in response to hydraulic pressure supplied from the outside, and a means for pressing the piston. A deck level modification device comprising a pedestal, preferably placed on the foundation below the deck, and a grouting pipe for injecting filler into the gap between the deck and the foundation, penetrating said support means. It is composed of a plurality of members each having an arc-shaped cross section that fits into the hole and a flange extending outside the through hole, and a grout pipe is passed vertically through the piston, and a floor is connected to the pedestal and connected to the grout pipe. A floor slab level correction device characterized by forming a hole opening at the bottom of the slab.