JP2001227285A - Method for preventing degradation of concrete tunnel structure body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for preventing degradation of concrete constituting a tunnel structure body regardless of the diameter size of the tunnel structure body to be constructed without causing diameter decrease of the tunnel structure body or impeding further progress of degradation of the concrete wherein degradation has already started. SOLUTION: An inorganic aqueous solution infiltrating deep into a concrete face and forming a water repellent layer to show a water absorption preventing effect is applied to the surface of the concrete tunnel structure body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating the inner wall surface of a concrete tunnel structure, for example, a sewer, a water supply, an electric wire, and a pipeline for a telephone line to prevent deterioration of concrete.

[0002]

2. Description of the Related Art Sewers and waterworks buried underground
Many pipelines for electric wires, telephone lines, etc. are made of concrete.

[0003] The surface of concrete varies greatly depending on the environment, but deteriorates due to components contained in the air that come into direct contact with the environment. The most influential is carbon dioxide which is slightly contained in the atmosphere (about 0.3%).
In the case of sewage, the concrete surface gradually neutralizes due to the sulfate ions contained in the sewage flowing down and the sulfuric acid formed by the oxidation of hydrogen sulfide generated from organic matter by bacteria, and the concrete surface gradually neutralizes over time. It is well known that neutralization (corrosion) proceeds inside.

Accordingly, concrete exposed to the atmosphere is inevitably neutralized with the lapse of time, and cracks occur due to contraction of the concrete and external forces. Hasten. In addition, pipes buried underground, especially sewer pipes, are deteriorated in a short time due to the above-described action.

[0005] If the pipe line which has been neutralized (corroded) is left as it is, the neutralization starting from the wall surface proceeds further inside, and finally the entire wall thickness of the pipe is neutralized. . Since the strength of the neutralized concrete portion is negligible, the strength decreases as the neutralization progresses, and finally reaches zero.
Further, the reinforcing steel in the concrete oxidizes and expands when the surrounding concrete is neutralized, thereby accelerating the destruction of the deteriorated concrete. Where the load cannot withstand the overload, the pipe wall is broken and sediment flows into the pipe, causing surface subsidence and collapse.

[0006] For this reason, the following repair methods have been applied to pipes in which neutralization has progressed, depending on the condition.

[0007] A method of installing a resin pipe inside a pipe: a hose-like material impregnated with a curable resin is drawn into the pipe from one manhole by an inversion method or a drawing method, and then is placed inside the hose-like material. Water or air is supplied, and the pressure causes the hose material to expand in diameter and adhere to the inner wall surface of the pipe. Next, depending on the type of the curable resin, when using a thermosetting resin, the water is changed to hot water, or the resin is cured by heating using steam or the like. Involves curing the resin by passing the light source through a material of increased diameter at a constant speed to form a new pipe.

[0008] A method of manufacturing a pipe using a vinyl chloride ribbon (profile) in a pipe, and injecting a backfill material into a gap between the existing pipe and the vinyl chloride pipe: forming a ribbon-shaped vinyl chloride band (profile). Pipes are sequentially formed by a pipe forming machine installed in the manhole so as to form a spiral pipe having a diameter smaller than the existing pipe diameter, and this pipe is made to reach from one manhole to the other manhole. Next, the pipe making machine was lifted up and removed.After removing both pipes, a pipe for injection was inserted between the existing pipe and the new pipe made of vinyl chloride in both manholes, and an air vent was released in one of the pipes. A pipe for checking the mortar filling condition is attached, and the gap between the two is filled with mortar and closed.

[0009] After removing the neutralized layer, a method of adjusting the groundwork with a mortar and forming an anticorrosive coating layer: generated by removing the neutralized layer after removing the neutralized degraded layer of the existing pipe by manpower or a machine. A method of forming a base by mortar for smoothing irregularities on the inner wall surface of the pipe, and then spraying or troweling an anticorrosive coating agent having durability such as acidity, alkalinity and strength. A primer may be applied between the base adjustment material and the anticorrosion coating layer.

In the above method, since a resin layer is formed in the conduit, the effective cross section of the conduit is reduced by the thickness of the resin layer.

In the above-mentioned method, since the pipe of vinyl chloride is formed in the pipe, the inner diameter of the pipe is reduced by at least one size (for example, Φ300 mm → Φ250 mm). If there is a step, the pipe diameter must be further reduced. For this reason, the effective cross section is reduced, and especially in the case of a small-diameter pipe, the flow-down capability may be reduced.

In the case of the above method, most of the work is required to be performed in a dry state. Therefore, in the case of a sewer pipe, it is necessary to temporarily stop running water or change the water during the work. At present, the work is mainly performed manually, so the diameter of the pipeline to be constructed is φ1500 mm or more.

[0013]

SUMMARY OF THE INVENTION Therefore, the present invention can prevent the deterioration of the concrete forming the pipeline without reducing the diameter of the pipeline and regardless of the diameter of the pipeline to be constructed. Another object of the present invention is to provide a method capable of preventing further deterioration of concrete which has started to deteriorate.

[0014]

In order to achieve the above object, the invention according to claim 1 of the present invention is directed to an inorganic material which penetrates deeply into a concrete surface, forms a water-repellent layer, and exhibits an effect of preventing water absorption. The system is characterized in that the aqueous solution is attached to the surface of the concrete tunnel structure.

The inorganic aqueous solution is, for example, a water-diluted type of a methyl silicate compound, which has a lower viscosity and surface tension than water, penetrates deeply into an object, forms a water-repellent layer, and forms a strong water-absorbing layer. It exhibits a preventive effect.

[0016] In this case, the hydrophobic crystals generated on the concrete surface of the tunnel structure make the concrete surface dense, strengthen, provide air permeability, and exhibit a water absorption preventing effect.

According to a second aspect of the present invention, a certain section of the tunnel structure is partitioned using a pair of packers, and an inorganic aqueous solution is injected into the partitioned and sealed section, filled, and further pressurized. It is characterized by infiltrating the system aqueous solution into the wall surface of the concrete pipeline in a limited section.

In this way, it is possible to treat a necessary portion in the tunnel structure within a necessary range at a stroke, and to apply the pressure so that the inorganic aqueous solution can penetrate deeper into the concrete. . Further, the inorganic aqueous solution can be uniformly and uniformly penetrated into the wall surface of the concrete structure.

According to a third aspect of the present invention, in the case where the tunnel structure is a pipe through which water flows, a certain distance between the upstream and downstream pipes of at least one manhole communicating with the target pipe is provided. By closing the section with a packer, a limited space is created by the manhole and a conduit communicating with the manhole, an inorganic aqueous solution is injected into the limited space from the manhole opening, and the liquid level is maintained at a position higher than the top of the conduit, and the manhole is removed. And an inorganic aqueous solution is infiltrated into the concrete wall surface of the pipeline.

In this way, construction over a long range in span units is possible.

The invention according to claim 4 uses a roller to which the inorganic aqueous solution is supplied, and a rotation drive device that rotates the roller in the circumferential direction of the inner wall surface while the roller is in contact with the inner wall surface of the tunnel structure. While continuously supplying the inorganic aqueous solution to the roller, the roller is rotated in the circumferential direction of the inner wall surface to apply the inorganic aqueous solution to the inner wall surface, and this operation is performed while moving the rotation driving device at a constant speed in the longitudinal direction of the tunnel. It is characterized by.

In this way, the permeation effect of the inorganic aqueous solution by the pressing of the roller is enhanced, and the tunnel structure having a medium or large diameter can be continuously processed.

The invention according to claim 5 uses a spray nozzle for spraying an inorganic aqueous solution, and a rotary drive device for rotating the spray nozzle in the circumferential direction of the inner wall surface with the spray nozzle facing the inner wall surface of the tunnel structure. While continuously supplying the inorganic aqueous solution to the spray nozzle, rotating the nozzle in the circumferential direction of the inner wall surface to spray the inorganic aqueous solution on the inner wall surface,
This operation is performed while moving the rotary driving device at a constant speed in the longitudinal direction of the tunnel.

In this way, the inorganic aqueous solution can be applied uniformly and uniformly, and the medium and large-diameter tunnel structure can be continuously treated.

The invention according to claim 6 is characterized in that a spray nozzle and a roller are used in combination.

The invention according to claim 7 is characterized in that the spray nozzle and / or the roller reciprocate in a certain angle range.

[0027]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention in the order of working steps A to D, in which 1 indicates a tunnel structure. The tunnel structure is, for example, a pipe for a sewer pipe, a water pipe, an electric wire or a telephone line. The present invention can be applied to a tunnel structure made of concrete, brick, or stone other than those exemplified above.

The embodiment shown in FIG. 1 shows a method for partially processing a certain section of the tunnel structure at a time. In this method, a pair of packers 2 connected by a connecting member 3 at intervals defining a certain section are used as shown. These packers are hollow bodies made of an elastic material such as rubber, and are configured to expand while expanding in diameter by injecting air or water into the inside, and to contract as the internal pressure decreases. Have been. A pipe 4 for supplying pressurized air or pressurized water from outside is connected to these packers.

Further, an inorganic aqueous solution sending / returning pipe 5 is connected to a packer unit including the packer 2 and the connecting member 3. The pipe 5 is guided through one of the packers 2, passes through the inside of the tubular connecting member 3, extends out of the connecting member halfway, and reaches the bottom of the tunnel structure. In the figure, reference numeral 6 denotes a tow rope (messenger wire) for moving the packer unit to a desired position in the tunnel structure.

The concrete deterioration preventing process according to this embodiment is performed as follows. First, as shown in FIG. 1A, the above-mentioned packer unit is moved to a desired position in the tunnel structure 1 by using a tow rope 6, and then pressurized air is supplied from outside via a pipe 4. Alternatively, pressurized water is sent into the packer 2, whereby the packer expands and expands, and finally, the outer peripheral surface of the packer is pressed against the inner peripheral surface of the tunnel structure, and between the two packers and the inner peripheral surface of the tunnel structure. Produce an enclosed space (see FIG. B).

Next, the inorganic aqueous solution is introduced into the above-mentioned closed space using the inorganic aqueous solution sending / returning pipe 5, and this space is filled with the inorganic aqueous solution. Further, the inorganic aqueous solution in the space is pressurized. Help the aqueous solution to penetrate inward from the concrete surface (step C). After pressurizing for a predetermined time, the inorganic aqueous solution in the closed space is sucked through the pipe 5 and discharged to the outside.

Next, the pressure medium in the packer 2 is removed via the pipe 4, the diameter of the packer is reduced, and the packer unit is moved by operating the traction rope 6 toward the next processing section (step D). In this way, the section 1a subjected to the anticorrosion treatment is brought to the concrete inner wall surface.

The above steps (A) to (D) may be performed on the inner surface of a new tunnel structure in which deterioration (neutralization) has not occurred, or a tunnel structure in which deterioration has begun. For example, it may be performed for a drain pipe. In the case of an existing pipe in which deterioration has progressed, the following pretreatment is performed as necessary before the above-mentioned process.

That is, depending on the degree of neutralization, the neutralized portion is removed manually or automatically. In the case of manual power, an electric sander or an electric pick is used. In case of automatic operation, an ultra-high pressure water generator (up to 2500K
gf / cm @ 2), and pressurized water is spouted from the nozzle gun while moving the apparatus to remove the weakened neutralized layer.

It is determined whether or not the neutral deterioration layer has been completely removed.
It can be confirmed by spraying a 1% solution of phenolphthalein on the presence or absence of a red reaction.

Apart from the case where the concrete wall after removal of the neutral deterioration layer has no irregularities and is smooth and there is no risk of obstructing the flow of sewage, when the surface is considerably rough and the roughness coefficient is large, The base adjustment is performed with mortar in order to eliminate unevenness and give the surface flatness. In the case of sewage pipes, mortars containing antimicrobial agents are used to further reduce the effects of acids.

FIGS. 2 and 3 show a second embodiment of the present invention, and particularly show an embodiment in which the present invention is applied to perform a deterioration preventing process for a sewer pipe. 2 and 3, 7a is an upstream manhole, 7b is a downstream manhole, 8 is a sewer pipe,
Both are constructed of concrete.

In the embodiment of FIG. 2, on the one hand, the upstream drain port of the upstream manhole 7a is stopped by the packer 9, and on the other hand, the downstream drain port of the downstream manhole 7b is closed by the packer 10. I have. These packers are shown as pipes 10a, 1
For example, by operating the valves 10c and 10d from the ground via the valve 0b, a compressed fluid (for example, compressed air) is supplied and expanded, and contracted after the permeation operation of the inorganic aqueous solution.

Next, the pretreatment as described above is performed, and thereafter, for example, from the tank lorry T, the inorganic aqueous solution is placed in the sewer pipe separated by the packer, and the head thereof is at least 0.5 m above the top of the sewer pipe. As such, thereby, the pressure of the aqueous solution is poured to promote penetration of the aqueous solution into the concrete. After the injection, the liquid is held for a certain period of time, and when the permeation is sufficiently performed, the liquid is pumped up by a pump or the like and returned to, for example, the tank lorry T described above.

FIG. 3 shows that the packer 12 is disposed at the outlet of the attachment pipe at the point where the attachment pipe 11 and the drain pipe 8 connected to the catchment basin of the house are connected, and is operated. An embodiment is shown in which the inflow of sewage from the mounting pipe is stopped and the deterioration prevention process is performed. The expansion and contraction of the packer 12 are performed in the same manner as the packers 9 and 10. The downstream packer 10 is disposed in the sewer pipe on the upstream side of the downstream manhole 7b. Thus, the location of the packer can be arbitrarily selected according to the selection of the degradation prevention processing location.

FIG. 4 shows an embodiment in which an inorganic aqueous solution is applied to a concrete surface using a roller. The roller 13 is rotatably attached to the tip of an arm 14, and this arm is attached to a rotation drive device 16 attached to a moving vehicle 15 so as to rotate around the center of the tunnel structure 17. An adjusting device is provided on the arm 14 or on the attachment of the roller to the arm 14 so that the roller 13 is pressed against the target wall with a constant force. Although two rollers are shown in the figure, one roller may be provided, or three or more rollers may be provided.

The inorganic aqueous solution is continuously supplied to the roller 13 during the coating operation. The supply of the inorganic aqueous solution is carried out via a pipe 18 from a supply device disposed outside the tunnel structure, for example. This is performed via the device 16 and the arm 14. The coating operation is performed while continuously supplying the inorganic aqueous solution to the roller 13, rotating the arm 14, and moving the movable wheel 15 in the direction of arrow D at a constant speed.

The embodiment shown in FIG. 4 is advantageous when the inner wall surface of a tunnel structure having a middle diameter and a large diameter and having the same section is continuous.

FIG. 5 shows an embodiment in which a spray nozzle 19 is used in place of the roller 13 in FIG. 4, and a supporting device for the nozzle 19, a rotating device for rotating the inner circumferential surface of the tunnel structure, and a tunnel structure Moving device in the body axis direction,
FIG. 4 shows an apparatus for supplying an inorganic aqueous solution to the nozzle.
This is the same as the embodiment.

FIG. 6 shows the case where the inorganic aqueous solution is applied by the combination of the spray nozzle and the roller as described above. In the illustrated embodiment, the spray nozzle 19 is attached to one arm 14. And the roller 13 is attached to the other arm 14.
In the case shown in the drawing, the spray nozzle 19 sprays the inorganic aqueous solution in advance, and covers the sprayed portion to perform the coating by the roller 13. As shown in FIG. 7, both the spray nozzle 19 and the roller 13 may be attached to one arm 14.

FIG. 8 shows an embodiment in which the rotation of the arm is reciprocated within a certain angle range, and the inorganic aqueous solution is adhered to a limited area in the circumferential direction of the inner peripheral surface of the tunnel structure. is there. Although the case where the roller 13 is used is shown, a spray nozzle may be used instead of the roller, or both may be combined as shown in FIGS. 6 and 7.

It is advantageous to carry out the application and infiltration treatment of the inorganic aqueous solution by the above-mentioned method. Alternatively, the application / penetration treatment may be carried out directly by hand, for example, using a brush or roller brush, or by a spray method. good.

[0049]

According to the present invention, the concrete can be prevented from being deteriorated by a relatively simple operation without reducing the diameter of the tunnel structure and regardless of the diameter of the tunnel structure.

[Brief description of the drawings]

FIG. 1 is a drawing for explaining a first embodiment of the method of the present invention in the order of steps.

FIG. 2 is a diagram illustrating a second embodiment of the method of the present invention.

FIG. 3 is a diagram illustrating a modification of the second embodiment.

FIG. 4 is a drawing for explaining a third embodiment of the method of the present invention.

FIG. 5 is a diagram illustrating a modification of the third embodiment.

FIG. 6 is a diagram illustrating another modification of the third embodiment.

FIG. 7 is a view for explaining still another modification of the third embodiment.

FIG. 8 is a view for explaining still another modification of the third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Tunnel structure (sewer pipe etc.) 1a ... Deterioration prevention processing place 2 ... Packer 3 ... Tubular connection member 4 ... Pipe 5 ... Pipe 6 ... Tow rope 7a ... Manhole 7b Manhole 8 Sewage pipe 9 Packer 10 Packer 11 Mounting pipe 12 Packer 13 Roller 14 Arm 15 Moving vehicle 16 ..Support device 17 ... Tunnel structure 18 ... Pipe 19 ... Spray nozzle

Claims (7)

[Claims] 1. A concrete tunnel structure characterized by deeply penetrating a concrete surface, forming a water-repellent layer, and adhering an inorganic aqueous solution exhibiting a water absorption preventing effect to the surface of the concrete tunnel structure. How to prevent deterioration. 2. A certain section of the tunnel structure is partitioned using a pair of packers, and an inorganic aqueous solution is injected into a partitioned and sealed section, filled, and further pressurized to reduce the inorganic aqueous solution to a limited section. The method for preventing deterioration of a concrete tunnel structure according to claim 1, wherein the method penetrates into a wall surface of a concrete pipeline. 3. When the tunnel structure is a pipe through which water flows, a certain section between the upstream and downstream pipes of at least one manhole communicating with the target pipe is closed by a packer. To create a limited space with a manhole and a conduit communicating therewith, inject an inorganic aqueous solution into the limited space from the manhole opening, keep the liquid level higher than the top of the conduit, and make the manhole and conduit concrete. The method for preventing deterioration of a concrete tunnel structure according to claim 1, wherein an inorganic aqueous solution is permeated into a wall surface. 4. A roller supplied with an inorganic aqueous solution,
Using a rotation drive device that rotates this roller in the circumferential direction of the inner wall surface in a state where it is applied to the inner wall surface of the tunnel structure,
While continuously supplying the inorganic aqueous solution to the roller, the roller is rotated in the circumferential direction of the inner wall surface to apply the inorganic aqueous solution to the inner wall surface, and this operation is performed while moving the rotation driving device in the longitudinal direction of the tunnel. Claim 1
3. The method for preventing deterioration of a concrete tunnel structure according to item 1. 5. A spray nozzle for injecting an inorganic aqueous solution, and a rotary driving device for rotating the spray nozzle in a circumferential direction of the inner wall surface with the spray nozzle facing the inner wall surface of the tunnel structure. 2. The method according to claim 1, wherein the nozzle is rotated in the circumferential direction of the inner wall surface while continuously supplying the aqueous solution to spray the inorganic aqueous solution on the inner wall surface, and this operation is performed while moving the rotary driving device in the longitudinal direction of the tunnel. 3. The method for preventing deterioration of a concrete tunnel structure according to item 1. 6. A spray nozzle for spraying an inorganic aqueous solution, a roller to which the inorganic aqueous solution is supplied, and rotating the spray nozzle in a circumferential direction of the inner wall surface with the spray nozzle facing the inner wall surface of the tunnel structure. A rotary driving device that rotates the roller in the circumferential direction of the inner wall surface in a state where the roller is in contact with the inner wall surface of the tunnel structure, while continuously supplying the aqueous inorganic solution to the spray nozzle and the roller, the nozzle and the roller around the inner wall surface. 2. The concrete tunnel structure according to claim 1, wherein an inorganic aqueous solution is sprayed and applied to the inner wall surface by rotating in a direction, and this operation is performed while moving a rotary driving device in a longitudinal direction of the tunnel. Deterioration prevention method. 7. The method according to claim 4, wherein the roller and / or the spray nozzle reciprocate over a certain angle range. Method.