JP4374273B2 - Storage pit lining structure and construction method thereof - Google Patents

Description

The present invention relates to a lining structure of a storage pit used when, for example, factory waste liquid or industrial waste, particularly waste containing a liquid substance, is stored temporarily or for a long period of time, and a construction method thereof .

  Conventionally, the storage pit as described above is generally formed in a substantially box shape with concrete or the like, and the liquid material stored in the pit does not leak through the concrete and leak to the outside. It is common to lay lining materials. In this case, if there is a pinhole or breakage in the lining material, there is a risk that the liquid material stored in the pit will leak from there, and if the leaked liquid material is an environmental pollutant, the surrounding environment may be damaged. is there.

  For this reason, after laying the lining material or during maintenance, etc., the operator inspects whether there are pinholes or broken parts by visual inspection or percussion. There were problems such as requiring skill, inefficiency and not always expecting reliable inspection.

  Therefore, in the following Patent Document 1, it is proposed that a mat made of a conductive material is interposed in the lining material so that the presence of a pinhole or the like can be efficiently detected by a discharge tester. Even with such a discharge type tester, it takes a lot of labor and time to inspect the entire surface of the lining material laid on the inner surface of a vast pit. There is a problem that the above inspection cannot be performed after the liquid substance is stored in the pit.

JP-A-8-93171

The present invention has been proposed in view of the above-mentioned conventional problems, and even when liquid substances are stored in the pits, liquid leakage from pinholes and breakage points generated in the lining material is easy. It is an object of the present invention to provide a storage pit lining structure that can be detected quickly and can reduce liquid leakage to the outside of the pit as much as possible, and a construction method therefor.

In order to achieve the above object, the lining structure of the storage pit and the construction method thereof according to the present invention are configured as follows. That is, the lining structure of the storage pit according to the present invention comprises a double liner by arranging the lining material for preventing leakage into a double layer inside and outside, and the double liner is arranged on the inner surface of the storage pit, Leakage detection means for detecting leaked liquid leaking into the leak detection space having a predetermined width between the lining materials is provided, and the leak detection space between the lining materials is leaked from within the leak detection space. A storage pit lining structure provided with a liquid leakage collecting means for collecting the double liner, wherein the double liner is formed by laminating the lining material made of thermoplastic resin in an inner and outer double, and any of the opposing surfaces of the two lining materials If one or both of them are provided with spacing holding projections, and some of the spacing holding projections are welded so as to connect the two lining materials, and the two lining materials are integrally connected. The butt of the dual liner mutual lining material to be connected, and joined by welding the butt portion, characterized by arranging a plurality of the dual liner on the inner surface of the storage pit. Further, the storage pit lining structure of the present invention is such that the butt portion is welded by depositing and welding a resin of the same material as the lining material, or the butt portion is made of the same material as the lining material. The resin plate is added, and a resin of the same material as the lining material is piled up and welded between both side edges of the resin plate and the lining material .

Further, the construction method of the storage pit lining structure of the present invention is configured such that a double liner is formed by laminating and arranging a lining material for preventing leakage into the inner and outer layers, and the double liner is disposed on the inner surface of the storage pit. A leak detecting means for detecting a leaked liquid that is disposed in the leak detecting space having a predetermined width between the two lining materials, and is provided in the leak detecting space between the lining materials. A storage pit lining construction method provided with a leakage recovery means for recovering leakage from the storage layer, wherein the lining material made of thermoplastic resin is laminated in an inner and outer double, and any of the opposing surfaces of the two lining materials The double liner is pre-configured by welding some of the spacing projections provided on one or both so as to connect the lining materials and integrally connecting the lining materials. , It carries the plurality of the double liner within the storage pit, by annex successively joined by welding the double liner, characterized in that disposed on the inner surface of the storage pit.

Lining structure and method construction of the storage pit according to the invention, ten thousand with leakage to the outside by an outer lining material leakage to an inner lining material occurs is prevented, leakage between the two lining material Liquid leakage is detected by the liquid leakage detection means provided in the liquid detection space, and maintenance such as repair of the lining material and collection of liquid leakage can be performed easily and quickly.

Hereinafter, the lining structure of a storage pit and the construction method thereof according to the present invention will be specifically described based on the embodiments shown in the drawings.

  FIG. 1 is a longitudinal sectional view of a storage pit to which the present invention is applied. The storage pit 1 of this example is formed in a box shape with concrete, and is embedded in the soil E with its upper surface exposed from the ground surface E1. It has been. In the storage pit 1, three pit spaces 2 having a square cross section in this example are provided, and double liners 3 are provided on the inner surfaces of the pit spaces 2, respectively. The double liner 3 is made of lining materials 3a and 3b laid in an inner and outer double, and a leakage detection space S is formed between the lining materials 3a and 3b. The number, cross-sectional shape, arrangement configuration, etc. of the pit space 2 are appropriate.

  The material of the lining materials 3a and 3b is also appropriate, and for example, a synthetic resin plate such as polyethylene can be used. In that case, the thickness of the inner lining material 3a is preferably about 3.0 to 5.0 mm, and the thickness of the outer lining material 3b is preferably about 3.0 to 4.0 mm, and between the lining materials 3a and 3b. The width dimension of the liquid leakage detection space S to be formed, that is, the distance between the two lining materials 3a and 3b is preferably about 3.0 to 4.0 mm.

  FIG. 2 is an enlarged view of a part of the storage pit 1, and the lining material 3 b outside the double liner 3 is fixed to the inner surface of the storage pit 1 through a hardening material 5 such as cement mortar. A large number of anchor projections 6 are integrally provided on the outer surface side of the lining material 3b, that is, the surface side facing the inner surface of the storage pit 1, and each anchor projection 6 is shown in FIGS. 3 and 4 in the embodiment. As shown, the bases of a pair of substantially plate-shaped pieces 6a, 6a opened in a substantially V shape are integrally fixed to the lining material 3b. Each anchor projection 6 is embedded in the hardened material 5, and the anchoring action prevents the lining material 3 b from being peeled off or displaced.

  A space holding spacer 7 as shown in FIG. 2 may be interposed between the lining material 3b and the inner surface of the storage pit 1, if necessary. A structure in which the base portion of the holding spacer 7 is attached to the inner surface of the storage pit 1 with an anchor pin 8, both ends of the U-shaped spacer 7 are bent away from each other, and the lining material 3b is brought into contact with the bent portion 7a. The spacer 7 keeps the distance between the lining material 3b and the inner surface of the concrete structure 1 constant.

As shown in FIG. 2, when the anchor protrusion 6 provided on the lining material 3b is engaged with the opening side of the U-shaped spacer 7, the lining material 3b and the double liner 3 are connected to the inner surface of the storage pit 1. It is possible to prevent the movement and the shift in the parallel direction. Furthermore, it is advisable to provide an interval holding means for keeping the distance between the two lining materials 3a and 3b, that is, the width dimension of the leakage detection space S at a certain level or more. The trapezoidal spacing projection 9 is provided, but the shape and arrangement of the spacing projection 9 are appropriate, and the spacing projection 9 is provided on the lining material 3b or on both the lining materials 3a and 3b. It may be provided. Further, the lining materials 3a and 3b are integrally connected and held by welding some of the spacing holding projections 9 so as to connect the both 3a and 3b, but they are omitted in the drawing.

  Further, when laying the lining materials 3a and 3b as described above, particularly when laying on the inner surface of a large pit space such as a storage pit, a plurality of plate-like or sheet-like lining materials are sequentially added and laid. However, if the inner lining material 3a and the outer lining material 3b are connected separately, for example, as shown in FIG. It is possible to prevent the detection space S from being divided.

  When a thermoplastic resin is used as the lining materials 3a and 3b, the lining materials to be connected are attached to each other and heat-welded, or a resin plate or sheet material of the same material as the lining material is attached to the attached portion. It is also possible to add or weld a resin of the same material. The outer lining material 3b in FIG. 5 has a structure in which a bonding resin 31 made of the same material as that of the lining material 3b is built up and welded along the joints attached to each other. A belt-shaped resin plate 30 made of the same material as that of the lining material 3a is attached along the joints attached to each other, and the same material as that of the lining material 3a is placed between the side edges of the resin plate 30 and the lining material 3a. In this configuration, the bonding resin 32 is built up and welded.

  When joining the lining materials that should be connected to each other as described above, the melted material is cooled and integrated by raising the temperature once. For example, as in the case of joining with an adhesive, the adhesive interface is often used. In particular, as shown in the above example, the bonding resins 31 and 32 are built up along the edge of the lining material and the edge of the resin plate 30 as shown in the above example. In the case of welding, the liquid tightness can be further improved. In addition, it is necessary to confirm that the above connection part does not cause a leak in a state where a predetermined pressure is applied by a known inspection method.

  In the leak detection space S, a leak detection means 10 is provided. As the detection means 10, for example, a known sensor cable 12 for detecting a leak as shown in FIGS. 1 and 2 is used. The provided leak detector 11 can be used. If the sensor cable 12 of the liquid leakage detector 11 is arranged and detected at a predetermined position in the liquid leakage detection space S, for example, a position where liquid leakage is likely to occur, a position where liquid leakage flows, or a position where liquid leakage tends to accumulate. Good.

  Further, in the above-described liquid leakage detection space S, it is preferable to provide a liquid leakage collecting means for collecting the liquid leakage when it occurs in the space S. For example, as shown in FIG. 6, the leak recovery pipe 13 whose one end communicates with a vacuum suction pump (not shown) or the like is connected to the lining material 3 a and the lining material 3 b at the corner of the storage pit 1. The other end of the recovery pipe 13 is opened at the bottom of the leakage detection space S, and the leakage accumulated in the vicinity thereof is pumped up and recovered. Further, the collected liquid leakage may be returned to the inner pit of the lining material 3a.

  In the above configuration, when liquid leakage such as factory waste liquid is contained in the pit space 2 of the storage pit 1 and a liquid leak occurs in the inner lining material, it is installed in the liquid leakage detection space S. The sensor cable 12 of the liquid leakage detector 11 detects liquid leakage and a signal is sent to the liquid leakage detector 11, indicating that the liquid leakage has occurred in the detector 11 with a display or the like, an alarm device or the like Let me know. Therefore, the person in charge repairs the lining material of the pit where the liquid leakage has occurred and collects the liquid substance leaked into the water leakage detection space S through the liquid leakage collection pipe 13.

  In addition, said leak detector 11 can also check whether the collection | recovery operation | work of leaked water was performed appropriately. Further, even when a liquid leak occurs in the inner lining material 3a as described above, there is another lining material 3b on the outer side, so that the liquid does not leak out of the pit, and the leaked liquid is collected. Can prevent the damage from spreading or spreading.

  In the above embodiment, the lining material 3 b is laid on the inner surface of the storage pit 1 via the curing material 5, but the lining material 3 b may be laid directly on the inner surface of the storage pit 1. Even in such a case, a large number of anchor projections 6 are integrally provided on the outer surface side of the lining material 3b, that is, the surface side facing the inner surface of the storage pit 1, and each anchor projection 6 is formed in the concrete or the like constituting the storage pit 1. When embedded, the double liner 3 can be prevented from being peeled off or displaced by the anchor action of each anchor projection 6.

  Next, a construction method for constructing the lining structure as described above will be described. As the construction method, after constructing the storage pit 1 or when constructing the lining structure on the existing storage pit 1, and when constructing the storage pit 1, the lining structure is constructed at the same time or the lining structure is constructed at a factory or the like. In some cases, the entire storage pit 1 is manufactured by precast or the like. FIG. 7 to FIG. 9 show an example, FIG. 7 and FIG. 8 show the former example, and FIG. 9 shows the latter example.

  That is, FIG. 7 shows that the above-mentioned lining structure is constructed on the inner surface of the existing storage pit 1 or the existing lining material 3a, 3b on the inner surface side of the storage pit 1 as shown in FIG. Is placed at a predetermined interval, and a fluid hardener 5 such as cement mortar is injected and filled between the inner surface of the storage pit 1 and the lining materials 3a and 3b to solidify the same. As shown in (b), the lining materials 3a and 3b are laid on the inner surface of the storage pit 1, and in particular, the outer lining material 3b is integrally and firmly fixed to the inner surface of the storage pit 1 through the curing material 5. It becomes.

  In FIG. 7, the lining materials 3a and 3b of the double liner 3 are preliminarily stacked and integrated when the curing material 5 is injected and filled. However, the lining materials 3b are formed separately from each other. May be fixed via the curing material 5 and then the lining material 3a may be disposed on the inner side to form the double liner 3. Usually, the existing storage pit 1 has a very small opening. However, when the lining materials 3a and 3b are made of, for example, thermoplastic resin, the lining materials 3a and 3b are divided into several small pieces. Then, it is possible to easily form a double liner by carrying it in the pit 1 and sequentially joining it by welding or the like.

  Furthermore, if the anchor projections 6 are provided in advance in the lining material 3b as shown in the drawing, the anchor projections 6 can be embedded in the cured material at the same time as the cured material 5 is injected and filled. In that case, if the surface of the anchor projection 6 is formed into a smooth curved surface as shown in the drawing, the flow of the curing material 5 is good, and it is possible to prevent the occurrence of air accumulation and unfilled portions.

  Further, when the hardening material 5 is injected and filled between the inner surface of the storage pit 1 and the lining material 3b as described above, the spacing spacer 7 as shown in FIG. 2 is interposed between the pit inner surface and the lining material 3b. By interposing, the distance between the pit inner surface and the lining material 3b can be kept constant. Further, when the spacing spacer 7 is fixed to the storage pit 1 with an anchor pin 8 or the like and the anchor projection 6 is engaged with the spacer 7, the lining material 3 b is thereby positioned, and the double liner 3 is attached to the storage pit 1. The hardening material 5 can be injected and filled in a state parallel to the inner surface, for example, in a vertical direction or held so as not to be displaced.

FIG. 8 shows that a hardened material (time-hardened material) 5 that is cured with time as shown in FIG. 8A is attached to the inner surface of a storage pit 1 that has been constructed in advance or is already installed by applying or spraying. When the lining materials 3a and 3b are pressed against the surface of the hardened material 5 in the uncured state 5, the lining materials 3a and 3b are placed on the inner surface of the storage pit 1 via the hardened material 5 as shown in FIG. obtained by the power sale by laying, in particular outside the lining material 3b is in a state of being closely fixed integrally to the inner surface of the storage pit 1 via the cured material 5.

  In this example as well, in the case of the figure, the lining materials 3a and 3b are arranged in advance. However, after the lining material 3b is fixed, the lining material 3a may be arranged inside thereof. If the anchor projections 6 are provided in advance in the lining material 3b as shown in the figure, the anchor projections 6 can be embedded in the curing material at the same time as the curing material 5 is injected and filled.

  Further, FIG. 9 shows that when the storage pit 1 is formed of concrete or the like, the lining material 3b is arranged at a position corresponding to the inner surface of the pit as shown in FIG. Concrete is placed in the area where it should be. Particularly in the case of the figure, a recess for forming the storage pit 1 is formed in the soil E near the ground surface E1, and the lining materials 3a and 3b are arranged at a predetermined interval on the inner surface of the recess, Concrete is cast between the lining materials 3a and 3b and the inner surface of the recess.

  The storage pit 1 is formed by the concrete as shown in FIG. 5B, and the lining materials 3a and 3b are laid on the inner surface thereof. In particular, the outer lining material 3 b is in a state of being directly adhered and fixed to the inner surface of the storage pit 1. In the figure, reference numeral 15 denotes a reinforcing plate arranged inside the lining materials 3a and 3b. After the concrete is placed, it is removed as shown in FIG. 9B. In addition, the entire storage pit 1 as described above may be precast manufactured in a factory and buried in the soil after the existing pit is removed.

  In this example as well, in the case of the figure, the lining materials 3a and 3b are arranged in advance. However, after the lining material 3b is fixed, the lining material 3a may be arranged inside thereof. If the anchor projection 6 is provided in advance in the lining material 3b as shown in the figure, the anchor projection 6 can be embedded in the concrete at the same time as the concrete is placed.

  Further, when placing concrete between the concave portion and the lining materials 3a and 3b, a spacing spacer 7 as shown in FIG. 2 is interposed between the concave portion and the lining materials 3a and 3b. Alternatively, the spacer 7 may be fixed to the inner surface of the recess with an anchor pin 8 or the like, and the anchor protrusion 6 may be engaged with and held by the spacer 7.

  When the lining material is laid in the manner shown in FIGS. 7 to 9, the lining structure can be provided on the inner surface of the pit easily, surely, easily and quickly. In particular, if the anchor projection 6 is provided in advance on the outside of the outer lining material 3b, the anchor projection 6 is embedded in the hardened material 5 or concrete, and the lining material 3b is fixed by the anchor action of the anchor projection 6. It can be attached and supported well and firmly on the inner surface of the pit.

  As described above, in the present invention, the inner and outer double lining structures can be provided on the inner surface of the pit simply, reliably, easily and quickly, and the leaked liquid has flowed into the leak detection space between the two lining materials. By providing the liquid leakage detecting means 10 for detecting the liquid leakage, it is possible to prevent the liquid leakage satisfactorily. For example, even in a storage pit that stores liquid harmful substances, reliability and durability are ensured. It is possible to greatly improve the performance.

The longitudinal cross-sectional view of the storage pit to which this invention is applied. The enlarged view of a part of said storage pit. The perspective view of the lining material used for the said storage pit. (A) is a top view of a lining material, (b) is the sectional drawing. The cross-sectional top view of the junction part of a running material. The cross-sectional top view of the example which provided the leak recovery pipe | tube in the corner part of the said storage pit. (A) And (b) is explanatory drawing which shows an example of the lining structure construction method. (A) And (b) is explanatory drawing which shows the other example of the lining structure construction method. (A) And (b) is explanatory drawing which shows the further another example of the lining structure construction method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Storage pit 2 Pit space 3 Double liner 3a, 3b Lining material 5 Hardening material 6 Anchor protrusion 7 Space | interval holding spacer 8 Anchor pin 9 Space | interval holding protrusion 10 Leak detection means 11 Leak detector 12 Sensor cable 13 Leak recovery pipe 15 Reinforcement plate E Ground E1 Ground surface S Leak detection space

Claims (3)

A double liner is configured by laminating and arranging the lining material for preventing liquid leakage inside and outside, and the double liner is arranged on the inner surface of the storage pit.
Provided with a leakage detection means for detecting leakage leaked into the leakage detection space of a predetermined width dimension between the two lining materials,
The storage pit lining structure is provided with a leakage recovery means for recovering leakage from the leakage detection space in the leakage detection space between the two lining materials,
The double liner is formed by laminating and arranging the lining material made of thermoplastic resin inside and outside, and a spacing holding projection is provided on one or both of the opposing surfaces of the both lining materials. It is constructed by welding some so as to connect both the lining materials and integrally connecting the both lining materials,
A lining structure for a storage pit , wherein the lining materials to be connected to each other are butted together and the butted portions are joined by welding, and a plurality of the double liners are arranged on the inner surface of the storage pit. As welding of the abutting portion, the resin of the same material as the lining material is welded to the abutting portion, or a resin plate of the same material as the lining material is attached to the abutting portion, and both sides of the resin plate are attached. 2. The storage pit lining structure according to claim 1 , wherein a resin of the same material as the lining material is deposited and welded between an edge portion and the lining material . A double liner is configured by laminating and arranging the lining material for preventing liquid leakage inside and outside, and the double liner is arranged on the inner surface of the storage pit.
Provided with a leakage detection means for detecting leakage leaked into the leakage detection space of a predetermined width dimension between the two lining materials,
A construction method for a lining structure of a storage pit that provides a leakage recovery means for recovering leakage from the leakage detection space in the leakage detection space between the two lining materials,
The lining material made of thermoplastic resin is laminated in an inner and outer double, and some of the spacing holding projections provided on one or both of the opposing surfaces of the both lining materials are connected to the both lining materials. The double liner is pre-configured by integrally connecting the lining materials by welding to each other,
A storage pit lining structure characterized in that a plurality of the double liners are carried into the storage pit, and the double liners are sequentially joined and joined by welding to be arranged on the inner surface of the storage pit. Construction method.

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