JP2834494B2 - Filling material injection method and apparatus - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a filler injection method and a filler injection device used in the method, and more particularly, to a construction constructed on a soft ground or a landfill ground which is likely to sink. TECHNICAL FIELD The present invention relates to a method and an apparatus for injecting a filler into a cavity buried in a foundation portion, which is a floor of an object or a bottom portion of a civil engineering structure, and when land subsidence occurs and a ground is formed between the ground and the foundation portion.

(Conventional technology) In soft ground and landfill ground, drive in sand piles to promote consolidation of the soil, bury drainage pipes to discharge water from the ground, or strengthen the ground. The ground is strengthened by performing ground improvement work by mixing chemicals into the soil.

However, in soft ground or landfill ground, even if the above methods are taken, it takes a long time until land subsidence is completed. It is usual to build civil structures such as roads. Therefore, land subsidence occurs after the construction of a building or civil engineering structure, and a cavity is created between the ground and the foundation of the building or civil engineering structure. Alternatively, various problems occur functionally.

Therefore, conventionally, a hole is formed in a foundation portion of a building or civil engineering structure having a cavity by using various boring machines, and a filler such as mortar or concrete is injected into the cavity through the hole.

(Problems to be Solved by the Invention) However, according to the above-described method, since drilling work by a boring machine involves generation of dust and noise, it is sufficient to temporarily stop the use of a building or a civil engineering structure or to prevent the building from being used. In addition to the need for curing, it is often difficult to provide a hole for injecting the filler at the optimum location because an obstacle is often present near the location optimal for the injection of the filler.

Therefore, the present inventor has previously buried an injection pipe having both upper and lower ends open in a foundation portion of a building or a civil engineering structure in order to easily inject a filler into a cavity formed in the ground. When a land subsidence occurs, a method is considered in which a filler is supplied to the inside of the injection pipe, and then the filler is pressed to be injected into the underground cavity from the lower end opening of the injection pipe.

However, according to this method, since the injection pipe having upper and lower ends opened in the base part is buried in advance, moisture and moisture in the ground pass through the inside of the injection pipe from the lower end opening of the injection pipe, and the base part is buried. A new problem of backflow on the surface has arisen.

Further, according to the above method, when the filler is supplied to the inside of the injection pipe for filling the filler, the filler remaining in the injection pipe without being injected into the cavity is solidified inside the injection pipe. However, when land subsidence occurs again in the future, there is a problem that the filler cannot be used to inject the filler into the cavity.

In view of the above, an object of the present invention is to make it possible to easily inject a filler into an underground cavity through the inside of an injection pipe, and to prevent moisture and moisture in the ground from entering the inside of the injection pipe. I do.

(Means for Solving the Problems) In order to achieve the above object, the invention of claim (1)
An injection pipe having a discharge port that is openably closed is buried in advance in a foundation portion of a building or a civil engineering structure, and when a cavity is created due to land subsidence, a filler is injected into the cavity from the discharge port. Things.

Specifically, a solution taken by the invention of claim (1) is an injection pipe provided with a discharge port for discharging the filler supplied to the inside of the pipe to the outside, on the pipe wall, A filling material injection device having a closing member for opening and closing the discharge port before discharging the filling material is buried in advance in a foundation portion of a building or civil engineering structure, and the building or civil engineering structure is When the ground on which the object is built sinks and a cavity is formed between the ground and the base portion, a filler is injected into the cavity from the discharge port.

In order to achieve the above object, the invention according to claim (2) is arranged such that the injection pipe is closed before the discharge of the filler in order to prevent the backflow of moisture and moisture, but the discharge of the filler is performed during the discharge of the filler. A discharge port opened to discharge the filler is provided.

Specifically, a solution taken by the invention according to claim (2) is an injection method in which a discharge port for discharging a filler supplied into the inside of the tube to a hollow in the ground is provided in a wall of the tube. It is configured to include a pipe and a closing member that closes the discharge port so that the discharge port can be opened before discharging the filler. And, in order to enable reuse of the filler injection device, the closing member is
It is configured so as to be freely loaded into and removed from the inside of the tubular body, and to have a pressing portion for pressing the filler inside the tubular body and discharging it from the discharge port when inserted into the inside of the tubular body. Things.

(Operation) According to the configuration of the invention of claims (1) and (2), since the closing member that closes the discharge port so that it can be opened before discharging the filler is provided, the underground moisture and moisture are discharged from the discharge port. Do not flow back through the injection tube through the tube.

Further, when the ground on which the building or the civil engineering structure is constructed sinks and a cavity is formed between the ground and the foundation of the building or the civil engineering structure, the filler is discharged from the discharge port of the injection pipe. Is injected into the cavity.

In particular, in the invention of claim (2), since the closing member is provided with a pressing portion that presses and discharges the filler inside the tube when inserted into the tube, the filling material is injected into the cavity. After completion, the filler is discharged to the outside by the pressing portion, and does not remain inside the tube.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a cross-sectional structure of a state in which a filler injecting apparatus A according to a first embodiment of the present invention is buried underground. In FIG. 3 is a discarded concrete cast on the stone 2 and 4 is a surface concrete as a foundation part of a building or a civil engineering structure placed on the discarded concrete 3. is there. In FIG. 1, reference numeral 10 denotes an injection pipe of the filler injection device A. The injection pipe 10 is, for example, a pipe 12 made of a steel pipe having a circular cross section with an inner diameter of 10 cm and an open lower end, and an upper part of the pipe 12. That is, a plate-shaped water-stopping member 14 is provided protruding from the outer peripheral surface of a portion corresponding to the surface concrete 4 and prevents underground water from rising along the outer peripheral surface of the pipe 12.

In the lower part of the pipe body 12, that is, on the peripheral wall corresponding to the ground 1, the chestnut stone 2 and the waste concrete 3, vertically long slit-like discharge ports 12a shown in FIG. When the material is injected, the filler injected from the upper end opening into the injection pipe 10 is discharged from the discharge port 12a to the underground cavity.

Inside the injection pipe 10, a columnar closing body 16 as a closing member is provided so as to be able to advance and retreat. The column-shaped closing body 16 is
A column 18 slightly smaller in diameter than the inner diameter of
And a plate 20 formed integrally with the upper end of the column 18 and having a larger diameter than the column 18.The peripheral surface of the column 18 closes the discharge port 12a before discharging the filler. The lower surface of the column 18 is filled with an injection pipe after the discharge of the filler is completed.
The pressing portion 18b is configured to extrude the filler remaining in the inside 10 and discharge the same through the discharge port 12a.

The filler can be injected into the underground cavity as follows using the filler injection device A of the first embodiment.

First, before constructing a building or civil engineering structure, the discharge port 12a faces the ground 1, the rock stone 2, and the waste concrete 3, and the upper surface of the top 20 of the closing member 16 and the surface of the foundation concrete 4 are substantially flush. The injection pipe 10 is buried in the base part so that

Next, for example, several years later, when the ground 1 subsides and a cavity is formed between the ground 1 and the surface concrete 4,
The filler 16 is pulled up from the injection pipe 10 to supply the filler to the inside of the injection pipe 10, and the filler is pressed by an appropriate pressing means and pressed into the underground cavity from the discharge port 12a.

After filling the filling material into the cavity in this way, the columnar closing body 16 is inserted into the inside of the filling tube 10, and the filling material remaining inside the filling tube 10 is discharged from the discharge port 12a into the cavity. ,
The column-shaped closure 16 is mounted inside the injection tube 10 as it is.

In this case, since the discharge port 12a of the injection pipe 10 is closed by the closing portion 18a of the column-shaped closing body 16, moisture and moisture in the ground flow back into the interior of the injection pipe 10 and eventually to the surface of the surface concrete 4. Can be prevented. In addition, the filler is discharged by the pressing portion 18b of the columnar closing body 16 and the injection pipe 1
Since it does not remain in the interior of the container, when the ground 1 sinks in the future, the injection pipe 10 can be used again and the filler can be injected into the underground cavity by the same method as described above.

The material of the filler that can be used in the filler injection device A is not particularly limited, but a material that is lighter than soil and has fluidity is preferable.

Further, the cross-sectional shape of the tube body 12 of the injection tube 10 is not limited to a circle, but can be appropriately changed to a square, a rectangle, or the like.

In addition, regarding the material of the pipe body 12, the surface concrete 4
Any material can be used as long as it can withstand pressure such as steel, cast iron, or synthetic resin such as vinyl chloride. However, if a transparent material is used, the degree of settlement of the ground 1 can be easily known. This is convenient.

Further, regarding the shape of the discharge port 12a provided in the pipe 12,
Instead of the above-mentioned vertically long slit shape, a circular hole provided in a scattered shape as shown in FIG.
It may be a spirally extending groove as shown in FIG. (C), and can be changed as appropriate.

Further, the material of the columnar closing body 16 can prevent moisture and moisture from flowing backward from the discharge port 12a by the closing portion 18a, and can press the filler by the pressing portion 18b and discharge it from the discharge port 12a. For example, a hard sponge or styrene foam can be used.

Further, as the structure of the columnar closing body 16, a steel pipe or a synthetic resin pipe provided with a bottom may be used instead of the column body 18 of the above-described embodiment, and further, the closing property of the discharge port 12a may be reduced. Column 18 to improve the pressability against
A sheet made of rubber or hard sponge may be wound around the sheet.

FIG. 3 shows a cross-sectional structure of a first modification of the first embodiment. In this first modification, three tiers of upper and lower ridges are provided around a pipe 12 as a water stopping member 14. A dish-shaped flange 22 is provided at the upper end of the tube 12. A rubber packing 24 is mounted between the bottom surface of the flange portion 22 and the lower surface of the plate body 20 of the columnar closing body 16, and the plate body 20 is fastened to the flange portion 22 by bolts 26, and In the case where moisture and water flow back into the inside of the concrete 10, the outflow to the surface concrete 4 surface is prevented.

FIG. 4 shows a cross-sectional structure of a second modification of the first embodiment. In the second modification, a screw groove 22a is provided on the inner surface of the peripheral wall of the flange portion 22 and a plate of the columnar closing body 16 is formed. Body 20
A thread 20a engaging with the thread groove 22a is provided on the outer peripheral surface to prevent moisture and moisture from flowing to the surface of the surface concrete 4 as in the first modification.

FIG. 5 shows a sectional structure of a third modification of the first embodiment. In this third modification, the column 18 and the plate
It is formed separately from 20, and a coil spring 28 is interposed between them. By doing so, the column 18 is urged downward by the coil spring 28, so that the backflow of the filler discharged into the cavity or the moisture or moisture from the discharge port 12a is reliably prevented.

FIG. 6 shows a sectional structure of a fourth modification of the first embodiment. In the fourth modification, the closing member is formed by a balloon 30 filled with air. In this way, the balloon 30
Closely adheres to the discharge port 12a of the injection pipe 10, and reliably closes the discharge port 12a, so that the backflow of moisture and moisture is reliably prevented.

FIG. 7 shows a filler injection device A according to a second embodiment of the present invention.
This filling material injection device A has a plurality of injection pipes 10 arranged in a line and having a lower end portion extending downward from the first embodiment. tube
An L-shaped delivery pipe 32 for communicating the filler material to each injection pipe 10 by communicating the upper end opening of the injection pipe 10 and a discharge port 12a inside the injection pipe 10
And an on-column closing member 16 that closes the discharge port 12a.

When the filling material injection device A according to the second embodiment is buried in a foundation portion of a building or a civil engineering structure, a plurality of solid filling material injection devices A are juxtaposed and sequentially when the ground 1 sinks. It is preferably used and the filler is injected into the underground cavity as follows.

First, a filler is supplied to the delivery pipe 32 of one filler insertion device A, and the filler is pressed. In this way, the filler is supplied to each injection pipe 10 through the delivery pipe 32, and then is closed.
Since 16 is pressed downward, the discharge port 12a is opened, and the discharge is performed from the discharge port 12a. In this case, in the other filler injection device A juxtaposed near the one filler injection device A, since the closing member 16 is disposed at a position corresponding to the discharge port 12a, The filler injected into the cavity from the one filler injection device A does not flow backward from the discharge port 12a of the other filler injection device A.

Next, when the ground 1 subsides again in the future, the filler can be injected into the cavity using the other filler injection device A.

When the delivery pipe 32 is provided as in the second embodiment, and the upper end opening of the delivery pipe 32 is arranged in a place where it does not interfere, the injection pipe is
Levels are adjusted for each injection pipe 10 so that the upper opening of the injection pipe 10 is prevented from being obstructed by many openings on the surface of the surface concrete 4 and the upper opening of the injection pipe 10 is flush with the surface of the surface concrete 4. You can save time and effort.

FIG. 8 shows a sectional structure of a first modified example of the second embodiment. In the first modified example, the closing member is formed by an air-filled balloon 30 and a pointed tip is formed at the bottom of the tube 12. Is provided. Therefore, balloon 30
When the balloon 30 is pressed downward by the filler and abuts against the tip of the projection 12b, the balloon 30 bursts, and the discharge port of the injection pipe 10 is discharged.
12a is released.

FIG. 9 shows a cross-sectional structure of a second modification of the second embodiment. In the second modification, a hinge 34a is supported outside the discharge port 12a of the injection pipe 10 so as to be openable outward. A lid 34 as a closed member is provided. Therefore, when the filler is supplied to the injection pipe 10, the filler presses the lid 34 outward, so that the discharge port 12a is opened.

FIG. 10 shows a cross-sectional structure of a third modification of the second embodiment. In this third modification, a strong wire mesh 36 is attached inside the discharge port 12a and outside the discharge port 12a. ,
A sheet 38 as a closing member that is broken by the pressing force of the filler is attached. In the third modified example, when the filler is supplied to the injection pipe 10 of one filler injection device A, the filler goes to the outside through the mesh of the wire mesh 36, so that the sheet 38 breaks and the discharge port 12a is cut off. On the other hand, in the other filling and injecting device A, even if the filler is pushed from the cavity to the discharge port 12a,
Since the sheet 38 is prevented from being broken by the wire mesh 36 provided inside, the discharge port 12a is in a closed state.
In this case, the mesh of the wire netting 36 is preferably about 20 to 30 mm so that the filler can flow from the inside to the outside and protect the sheet 38 from being broken by the filler coming from the outside.

(Effects of the Invention) As described above, according to the inventions of claims (1) and (2), before the filler is discharged, the closing member that closes the discharge port so that the discharging port can be opened is provided, so that the moisture in the ground can be reduced. Water does not flow back into the injection pipe from the closed discharge port, and when the ground subsides and a cavity is formed between the ground and the foundation of the building or civil engineering structure, the discharge of the injection pipe will not occur. Filler can be injected into the cavity from the outlet. For this reason, the filler can be easily injected into the underground cavity, and the soil moisture and water do not flow back into the injection pipe.

Particularly, according to the invention of claim (2), since the closing member is provided with the pressing portion for pressing and discharging the filler inside the tube, the filler is injected after the completion of the injection of the filler into the cavity. Since it does not remain inside the tube, it is possible to reuse the filler injection device.

[Brief description of the drawings]

FIGS. 1 and 2 (a) show a filler injection device according to a first embodiment of the present invention. FIG. 1 is a sectional view thereof, FIG. 2 (a) is a side view of an injection tube, and FIG. Figures (b) and (c) are side views showing a modified example of the injection tube, and Figures 3 to 6 are cross-sectional views showing modified examples of the filler injection device according to the first embodiment, respectively. The drawings are cross-sectional views of a filler injection device according to a second embodiment of the present invention, and FIGS. 8 to 10 are partial cross-sectional views each showing a modification of the filler injection device according to the second embodiment. A: Filler injection device 10: Injection tube 12: Tube 12a: Discharge port 16: Column-shaped block (blocking member) 18a: Blocking portion 18b: Pressing portion 30: Balloon (blocking member) 32 ... Delivery pipe 34 ... Lid (blocking member) 38 ... Sheet (blocking member)

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E02D 3/12 101 E02D 37/00

Claims (2)

(57) [Claims] 1. An injection pipe provided with a discharge port for discharging a filler supplied to the inside of the pipe to the outside on a pipe wall, and the discharge port is provided before discharging the filler. A filler injecting device having a closing member that is releasably closed is buried in advance in a foundation portion of a building or civil engineering structure, and the ground on which the building or civil engineering structure is built sinks, and When a cavity is formed between the ground and the foundation portion, a filler is injected from the discharge port into the cavity. 2. An injection pipe provided with a discharge port for discharging a filler supplied to the inside of the pipe into an underground cavity in a pipe wall, and the injection pipe is provided before discharging the filler. A closing member for opening and closing the discharge port, wherein the closing member is loaded so as to be able to be taken in and out of the inside of the tube, and a filler material inside the tube when inserted into the inside of the tube. A filler for pressing the liquid and discharging the liquid from the discharge port.