JPH0657930B2 - How to repair subsidence of concrete pavement - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a subsidence restoration method for a concrete paving slab on the ground.

<Prior art> Conventionally, the sinking restoration method for concrete paving slabs is equipped with a metal fitting that allows various jacks (pushing tools) to be attached to the concrete paving slab in advance, and when the paving slab sinks with the roadbed, jack the above metal fittings After mounting, press the upper surface of the roadbed (pressure-receiving block surface that has been buried in the roadbed in advance), lift the pavement plate from the roadbed by the reaction force, keep that state, and lift the grout from the grout injection hole of the pavement plate It is injected between the plate and the roadbed to solidify.

<Problems to be solved by the invention> In the conventional method of lifting a pavement sunk by a jack, a large force is locally applied to the pavement, causing a curve, which causes a crack on the surface of concrete that is weak against bending. Cheap. Therefore, operate a large number of jacks at the same time, paying close attention to avoid excessive bending of the paving slab, continuously measuring, and gradually lifting the paving slab from one end to the other. I have to. Therefore, it is necessary to embed many jack fittings in the pavement in advance.
A large number of jacks and personnel to operate them at the same time were required for restoration, and strict construction management and height measurement from the beginning to the end were required.

The present invention breaks the conventional fixed concept that the only way to repair a settled concrete paving slab is to lift it with a jack, and developed a method of evenly lifting the paving slab with fluid pressure.

<Means for Solving the Problem> In the settlement method of the concrete paving slab of the present invention,
(1) between the concrete pavement and the ground, a flat bag is laid in advance, the injection port to the bag is communicated with the upper surface of the pavement plate, and when the pavement plate sinks, the bag is injected from the injection port. Fluid and grout were press-fitted into the pavement, the sinking part of the pavement was lifted from the ground to the restoration height, and it was press-fitted into the bag. If it was a fluid, replace it with grout, and the entire bottom surface of the sinking part. It is characterized by supporting the grout and solidifying the grout.

Similarly (2) is that a frame-shaped bag is laid in advance between the lower peripheral edge of the concrete paving slab and the ground, and the inlet to the bag is communicated with the upper surface of the paving slab. At the position that hits, the flat pouch for lifting the pavement plate end is laid on the pavement plate, between the ground, or the lifting jack mounting part is provided on the pavement plate side, and when the pavement plate sinks, Fluid or grout is injected into the flat bag from the injection hole, or a jack is attached to the lifting jack attaching portion, one end of the paving slab is lifted from the ground, and compressed air is added to the frame-shaped bag. As a peripheral leak-proof material for the gap between the pavement and the ground to be lifted, the grout is sequentially pressed into the pavement from the through holes provided at each position of the pavement and from one end to the other end of the gap between the pavement and the ground. And finally lift the entire paving slab to the restoration position and It solidified and was then pressed into the inner bag when a fluid is characterized in that the solidifying interchanged this grout.

(3) is the restoration method of (1) or (2) above, in which a horizontal control beam is laid over the paving slab before the fluid or grout is press-fitted, and the pavement lifted by the lower surface of the beam is used. It is characterized by stopping the plate at the required restoration height.

That (4) is the method of repairing (1) or (2) above, wherein the various bags are provided with a grout guide groove on one side inner surface thereof that does not adhere to each other even when the inner surfaces of both sides are pressed against each other. The feature is that it extends from the entrance to the entire bag.

<Operation> The present invention can be applied to cast-in-place concrete pavement and PC concrete plate pavement.

In the invention of the above (1), a flat bag is laid in advance on the roadbed,
Since a concrete paving slab is laid on top of it and the inlet to the bag is open to the top surface of the paving slab, if the fluid or grout is pressed into the bag from the inlet when the roadbed is submerged, the paving slab will easily be on the roadbed. Lifts from. The pavement slab is light in weight for its area, so it can be easily lifted by applying wide pressure to the lower surface.

The above flat bag may be laid on each PC concrete paving slab, one of the same shape, or one for each cast-in-place concrete paving slab, but several bags are laid side by side in a large parcel. Good. This requires a relatively small pump facility. It is also convenient to repair the pavement plate one by one from the edge, and when only a part of the pavement plate sinks, the grout can be sent only to the flat bag of that part.

It is better not to press the grout from the beginning, but to lift the paving slab correctly to the required height by first pressurizing the fluid, then discharging the fluid from one end of the bag and pressing the grout from the other end to replace it. , There is no risk of failure due to early solidification of grout. However, if you are skilled in the work, you can press grout from the beginning, lift the pavement and inject grout all at once.

In (2) of the present invention, the flat bag is formed into a frame shape to prevent the grout from being directly press-fitted between the ground and the pavement inside the flat bag.
Since a huge pump facility is required to lift the vast concrete paving slab at the same time, a method of sequentially lifting the slab from one end to the other is adopted.

That is, it is a matter of course that a frame-shaped bag is laid in advance on the peripheral edge of the lower surface of the pavement plate, and an inlet for the bag and a through hole for grout injection into the frame are provided in the pavement plate. An uplifting means to lift one end was added. As a means of raising, either a small flat bag is laid or a conventional jack is used.

If a flat bag is inflated or the ground is pushed with a jack, one end of the pavement plate will rise even slightly, and if there is a gap between the bottom surface of the pavement plate and the ground, the role of the raising mechanism is completed. Then, if the grout is directly pressed into the gap, it is easy to lift one end of the pavement plate to the restoration height by the pushing force obtained by multiplying the expanded area of the upper surface of the grout by the grout pressure. Then, grouts are successively injected into the through holes on the other end side, and the heights are sequentially repaired. Finally, the entire paving slab is repaired to solidify the grout.

When repairing a submerged pavement plate, it is not easy to measure and adjust the upper surface of a vast area to match the desired repair surface, but this (3) of the present invention simplifies this at once. To do. The horizontal restraint beams on the pavement to be repaired stop the lifting pavement, eliminating the need to measure or adjust vertically during busy restoration work.

That (4) of the present invention, the above (1), by providing a grout guide groove on the inner surface of one side of each bag of (2), even if both inner surfaces of the bag are pressed and closely adhered to the pavement, The guide groove helps the grout to enter, so that the inner surfaces of the bag are easily pushed apart, and the grout advances to the end of the bag.

<Example> FIG. 1 shows a pavement slab of the present invention and a flat bag 1 laid between the ground.
And an injection pipe 3 embedded in the plate for communicating the injection port 2 with the upper surface of the paving slab and an injection block 4 vertically supporting the injection pipe 3. The injection block 4 is a paving plate C.
When is molded with concrete, the injection pipe 3 is fixed so as to be vertically supported in the plate. The upper end of the injection pipe 3 stands in the opening chamber 4a of the block 4, and the lid provided on the surface of the paving slab covers the upper surface of the opening chamber 4a until ground subsidence occurs. In the figure, with the lid removed, the upper end of the injection pipe 3 can be connected with either a fluid (air, water, etc.) hose or a grout hose. When fluid or grout is pressed into the bag 1 from the hose, the bag 1 bulges like a chain line 1'and lifts the pavement C from the ground E.

The bag 1 shown in FIG. 1 has the same shape as a factory-made PC concrete pavement slab or a section of cast-in-place concrete pavement slab,
A square bag having the same area is assumed, but a plurality of smaller bags may be laid side by side.

Fig. 2 shows a partial plan view of cast-in-place concrete pavement at an airport. Pavement plate C in the figure is a single placement section (width 7 m, length
It is 100 m long and about 19 cm thick), and these are connected side by side to provide expansion joints B between the large blocks. The settlement height will be around 30mm to 120mm.

Each pavement plate C is provided with an opening chamber 4a leading to the bag inlet. A horizontal regulating beam 5 is provided at a required position of one pavement plate C, and a pavement plate c ′ under the beam 5 is now under repair work. The repair process is shown in FIGS.

Restoration work is done for each section of pavement, that is, for each pavement plate in the figure. As shown in FIG. 3, a pair of threaded struts 6 are erected on both sides of the paving slabs C, C adjacent to the paving slab c ′ to be restored, and the both ends of the beam 5 are passed through the pair of struts 6, 6 to Adjust the height and level with the adjusting nut, and use this to make measurement adjustments before ascending.

In the lifting work, the grout press-fitting hose 7 is connected to the injection pipe 3 except for the lid of the opening chamber 4a at the end of the target paving plate c ', and the grout is press-fitted into the bag 1. As a result, the grout is slightly curved near the end of the pavement c ′ that has sunk and lifted up, and if the grout press-fitting operation is continued, the grout is pressed against the lower surface of the horizontal regulating beam 5. If the grout is pressed into the inlet on the other end one after another, the pavement c'will eventually be lifted to the repair position shown in FIG. The upper end of the injection pipe 3 at the position where the grout has been press-fitted is closed by a pre-connected cock 8 and waits for the grout to solidify.

FIG. 5 shows how to install the regulating beam 5 when the adjacent pavement C on one side has been restored. Generally, as shown in FIG.
Repair one by one.

Although not shown in FIG. 2, in order to integrate the slender paving slabs C with each other, a connecting steel rod 9 and a joint material 10 as shown in FIG. As a result, when the paving slabs C are repaired one by one as shown in FIGS. 3 to 5, the connecting steel rods 9 are separated in advance, and in the case of FIG. 7, the left paving slab C is first repaired. . Next, when the paving slab C on the right side of FIG. 7 is also raised to the repair position, the separated steel rods 9 are lined up at the same height again.

Therefore, in order to connect them, as shown in FIG. 8, the concrete on the upper side of the steel rods 9 on both sides was dug into a circle by a boring machine, and the surroundings of the steel rods 9 and the concrete on the lower side were destroyed by automatic chisel and removed. , The opposing cut portions of the steel rod 9 are rejoined by bolting or welding with the common connecting fitting 11. It goes without saying that the joint material 10 and the concrete that has been removed are restored.

9 to 11 exemplify various flat bags of the present invention, and FIGS. 9 and 10 show a rectangular bag 1 having a grout guide groove 12. A guide groove 12 runs in the vertical and horizontal directions starting from the lower end of the injection tube 3 which is previously attached to the bag 1 and is made to stand by itself. Note that the guide groove 12
As shown in Fig. 11, the cross section of is sufficient if two ridges are arranged side by side on a smooth bag. As a bag, it is highly elastic,
As long as it is waterproof, rubber, polyvinyl chloride, etc. are used.

The solid line in FIG. 12 is an example of the frame-shaped bag 1a, and if it is made into a ladder shape as shown by the chain line, it becomes a mesh-shaped bag.

In each case, the injection pipe 3 is attached.

13 and 14 show an embodiment of a method of sequentially repairing from one corner of the sinking region without cutting the connecting steel rods 9 between the paving slabs C. Square bag 1 is the same as the previous one, each bag 1
By adjusting the speed of pressurizing the fluid or grout into the
As shown in Fig. 14, while several paving slabs C are connected, a gentle slope is created and lifted. When the highest one hits the common horizontal regulation beam 5, the feeding to it is stopped and the feeding hose is connected to the injection pipe 3 at a position where the feeding hose is newly inclined and lifted. By repeating this operation, the repaired area is expanded, and finally the entire area is in contact with the horizontal regulating beam 5.

FIGS. 15 and 16 show the embodiment (2) of the present invention, in which one pavement plate C is sequentially lifted from one end by the frame-shaped bag 1a. Although not shown in the drawing, it goes without saying that the horizontal regulating beam 5 is provided at each position. A flat bag 14 for lifting the pavement plate end is provided at one end inside the frame-shaped bag 1a.

In this case, the through hole 13 for injecting grout between the ground E and the paving slab C where the bags 1a and 14 are not present is pierced in the paving slab at the time of restoration in this case. FIG. 17 shows the injection pipe 3, the connection parts of the connection fitting 15, the cock 8, and the hose 7 to the injection pipe 3, the through hole 13 for injecting grout on the site, and the spout inserted into the large diameter part at the upper end thereof. Between the conical outer wall of the outlet 16 and the large-diameter inner wall 3 to
The state where four wedges 17 are driven and fixed is shown. In addition, the frame-shaped bag 1a shows the place where the grout G is prevented from leaking.

FIG. 18 shows an example in which a lifting jack mounting portion 18 is provided on the pavement C side instead of the lifting flat bag 14 of FIGS. 15 and 16, and a hydraulic jack J is attached to this and is buried in the ground E. Pressure receiving block 19
Lift the paving slab C by pressing down, and then remove the jack J so that it can be removed.
Shown in a state of being supported by. The upper end of the pavement plate through hole 21 to which the support bolts 20 are attached and the upper end of the jack attaching portion 18 are always covered with a stainless steel plate or the like and laid flat.

Although a few examples have been described above, the embodiments of the present invention can be variously modified and applied within the scope of the gist of the invention by a technique known to those skilled in the art.

For example, the composition of grout can be changed according to the use conditions, and the time until solidification can be adjusted to the working process, or a common large flat bag can be used under several PC concrete paving slabs, and the same position of each slab can be moved at the same speed. Or, in a section of concrete paving slab, divide multiple pieces in the longitudinal direction and lay out a plurality of small rectangular bags side by side. After pouring grout into the bag to solidify and support the concrete slab, remove the press-fitted fluid and inject the grout to restore the entire surface, or lay multiple flat bags each with an injection port, The injection port is passed through the bag on the upper side and communicated with the upper surface of the paving slab to enable several times of subsidence repair, or (1) to (4) of this invention.
It is not difficult to consider such as an application method in which is properly combined.

<Effects of the Invention> This invention is a method of repairing a concrete pavement that sinks together with the ground, eliminates the conventional fixing concept that is said to be due to a large number of jacks, and inflates and lifts the bag laid under the pavement. Opened a new method.

In addition to supporting the pavement slab entirely at the restoration position with grout pressed into the bag, fluid or grout is press-fitted into a frame-shaped bag laid on the lower surface of the peripheral edge of the pavement to prevent leakage, and onto the ground inside it. By directly filling the grout with a bag of a comparatively small area, a method of supporting the entire lower surface of the pavement plate with the grout was shown, and it was shown that the fluid in the bag can be replaced with the grout.

According to this method, one end of the concrete paving slab is slightly lifted with a bag having an extremely small area, and the grout is press-fitted into the gap so that the paving slab is lifted in a chained manner toward the other end. Since it is not necessary to lay a square bag over the entire area of the paving slab, the amount of work and the required materials are reduced to improve economic efficiency.

The difficulty of subsidence restoration of the pavement plate is because it was necessary to perform measurement and adjustment during which the upper surface of the pavement plate was correctly aligned to the restoration position during the ascending work.However, according to (3) of the present invention, Since the horizontal control beam is firmly installed on the top, it is sufficient to be careful not to apply strong grout injection pressure to the paving plate during lifting work so as to lift the control beam.

When pressing fluid or grout into a bag that is flatly crushed between the pavement and the ground for the first time, a large paving slab must be lifted by the reaction force that has pressed down the narrow area at the lower end of the injection pipe. , I can't go in the grout. However, according to the present invention (4), there is a grout guide groove on one side of the bag, and since it does not collapse even if the bag is crushed, fluid or grout can easily enter the bag along the guide groove from the beginning. After that, the pavement slab is floated over the total area, so that the maximum value of pumping pressure can be low.

According to the present invention, the settling concrete pavement slab is floated over a large area by fluid pressure and grout pressure instead of by a jack. Therefore, the risk of cracking or damage to the pavement slab due to the lifting work is drastically reduced. In addition, the work of pushing up with one place, one place, and the jack is widely lifted all at once with the pump and hose, so the productivity improvement and the shortening of the construction period are great.

[Brief description of drawings]

FIG. 1 is an explanatory view of the main part of the present invention, FIG. 2 is a plan view of an embodiment in which the present invention is applied to a pavement plate subsidence repair work at an airport, and FIGS. 3, 4, and 5 are pavement plates in the work of FIG. Fig. 6, 7 and 8 are elevation views before and after lifting, and Fig. 6, 7 and 8 are local cross-sectional views showing the connecting and connecting rods of adjacent pavement plates, and Figs. 9 and 10 are with grout guide groove. A plan view of an example of a rectangular bag, an elevation view, FIG. 11 is a cross-sectional view of an example of a grout guide groove, FIG. 12 is a plan view of an example of a frame-shaped or mesh-shaped bag,
13 and 14 are plan views, side views, and 15 and 16 of an embodiment in which a wide paved surface is sequentially lifted from the corner without cutting the connecting steel rod.
The drawing shows a plan view, an elevation view, and a seventeenth embodiment of the embodiment (2) of the present invention.
The figure is an elevation view of the injection pipe, the connection of the injection hole and the hose, and Fig. 18 is the elevation view of the mounting jack mounting part. In the figure, 1,1a and 1b are various bags, 5 is a horizontal regulating beam, Reference numeral 12 indicates a grout guide groove.

Claims (4)

[Claims] 1. A flat bag is laid in advance between the concrete paving plate and the ground, and an injection port for the bag is communicated with an upper surface of the pavement plate. When the pavement plate sinks, the above-mentioned injection port is used. If fluid or grout is pressed into the bag and the sinking part of the pavement is lifted from the ground to the restoration height, then press it into the bag. If it is a fluid, replace it with grout, then lower surface of the sinking part. Support the whole with grout,
A subsidence restoration method for a concrete pavement characterized by solidifying the entire grout. 2. A frame-shaped bag is previously laid between the peripheral edge of the lower surface of the concrete paving slab and the ground, and an injection port for the bag is made to communicate with the upper surface of the pavement slab, and at one end of the pavement slab. At the position where it hits, the flat pouch for lifting the pavement plate end is laid in advance between the pavement plate and the ground, or the jacking part for the lifting plate is provided on the pavement plate side, and when the pavement plate sinks, Fluid or grout is injected into the flat bag from the injection hole, or a jack is attached to the lifting jack attachment portion, one end of the pavement plate is lifted from the ground, and compressed air is added to the frame-shaped bag. As a peripheral leak-proof material in the gap between the pavement and the ground to be lifted, and press grout in order from the through holes provided at each position of the pavement to the pavement and the one end to the other end of the gap between the ground. And finally lift the entire paving slab to the repair position,
A subsiding restoration method for a concrete paving slab, which comprises solidifying a grout and, when a fluid is pressed into the bag, replacing the fluid with a grout to solidify the fluid. 3. The restoration method according to claim 1 or 2, wherein a horizontal regulating beam is laid over the pavement plate before the fluid or grout is press-fitted, and the horizontal lowering beam is lifted by the lower surface of the beam. A subsidence restoration method for a concrete pavement, which is characterized by stopping the pavement at a required restoration height. 4. The restoration method according to claim 1 or 2, wherein the various bags are provided with a grout guide groove on one inner surface thereof that does not adhere to each other even when the inner surfaces on both sides are pressed against each other. A subsidence restoration method for concrete paving slabs, characterized by extending from the inlet to the entire bag.