JP3479819B2 - RC segment bolt box closed structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the construction of underground passages such as underground passages, subway passages, various cable pipelines, water and sewer pipelines, and ground pipelines (hereinafter abbreviated as pipelines) such as railways, roads, and water and sewers. The present invention relates to a method for closing an open connection box that allows even dew condensation to occur.

[0002]

2. Description of the Related Art Pipe lines are usually constructed by assembling a plurality of segments into a tunnel shape by joining the end faces of each segment to each other by shield work or the like. This assembly is usually done by joining the inner perimeters 2, 2 of the segments 1, 1 respectively to the end faces 5, 5 by means of bolt nuts 4 from the connecting boxes 3, 3 respectively, as shown in FIG. However, if this is left as it is, the connecting boxes 3 and 3 are opened, and the bolts and nuts 4 are also exposed. Bolt nut 4 if exposed
Eventually corrodes, leading to a decrease in the strength of the joint. In order to prevent this corrosion, the bolt nut 4 in the bolt box is usually used.
Is often filled in the entire box with mortar. However, even in the case of the mortar, there are cases in which the adhesive strength with the bolt box is deteriorated due to aging, and the mortar further falls off due to vibration or the like. When the mortar falls off, the apparent specific gravity of the mortar is large, so it is predicted that the mortar may collide with a vehicle such as an electric train or an automobile running in the pipeline, leading to a risk of damage.

Therefore, the inventors of the present invention, as a bolt box closing structure which is lighter in weight than mortar and has no risk of falling, uses a ceramic porous body having a pre-injection hole after connecting a bolt and nut as a surface material of the bolt box 4. After setting the surface material made of porous material and adhering the pedestal part of the surface material and the bolt box with an adhesive, a foaming resin is injected as a filler from the injection hole provided in the surface material to foam and fill. A closed structure was proposed. (JP-A- 8-1
(Japanese Patent No. 77394 )

However, since the above-mentioned proposal uses foaming urethane or phenol as a filler, the effect is exhibited without any particular problem in injection and foaming work in a state where the inside of the conduit is dry and the bolt box is not wet. However, during the rainy season, when the temperature inside the pipeline is lower than the outside temperature, or during the summer, dew condensation occurs on the surface inside the pipeline including the bolt box. Problems such as poor adhesion to the bolt box have occurred.

According to the present invention, as described above, not only when the inside of the pipeline is dry when the filler is injected and the bolt box is not wet, but also when the temperature inside the pipeline is lower than the outside temperature, the rainy season is low. In normal season or in summer, even when dew condensation occurs on the inner surface of the pipeline including the bolt box, normal injection is always possible without causing foaming failure or adhesion failure between the urethane foam or phenol foam and the bolt box. -The purpose is to make it possible to obtain a bolt box closing structure that can be foam-filled and can be bonded to each other.

[0006]

According to a first aspect of the present invention, as described in claim 1, there is an injection hole as a surface material as a structure for closing a bolt box provided between segments in connecting RC segments. An RC segment bolt in which a ceramic porous body is disposed and adhered, and a foaming hard resin as a filler is injected from the injection hole of the surface material to fill and foam, and the inner wall surface of the bolt box is coated with a synthetic resin. An RC segment bolt box closing structure, characterized in that it is a box closing structure and the synthetic resin used for the coating is an epoxy adhesive as described in claim 2. Further, as described in claim 3, the ceramic porous body used as the surface material has a foamable synthetic resin having a three-dimensional network skeleton structure as a base material, and ceramic mud is adhered to the base material and fired. To be. Alternatively, as described in claim 4, as the surface material, a ceramic porous body alone or a material obtained by laminating a calcium silicate plate or the like is used. Further, as described in claim 5, it is preferable that the base material of the ceramic porous body having a three-dimensional network skeleton structure which is the surface material is a polyurethane foam resin.
It is a segment bolt box closing structure.

Further, as described in claim 6, as the epoxy adhesive used in the present invention, the epoxy adhesive is
Bisphenol A type liquid resin and its modified product as the main agent, and any one or a combination of acid anhydrides such as primary, secondary amine, polyaminoamide, phthalic anhydride, etc. as the curing agent, the main agent / hardening agent = 1/1 to 1.05 / 1
It is characterized in that the mixture is used in a (weight ratio), and the foamable hard resin to be used as the filler is a hard foam urethane resin or It is characterized in that a foamed phenol resin alone or a hard foamed urethane resin or foamed phenolic resin containing water glass as a part thereof is used.

[0008] In order to solve the above problems, when assembling a pipe line by joining the end faces of a plurality of segments such as reinforced concrete reinforcement to each other to form a pipe line, an opening portion faces inward around each segment in the previous period. The bolt box inner wall (entire surface) is preliminarily defined in the above-mentioned claim 6 as a closed structure for the opening portion of the bolt box of the underground buried pipe that joins the end faces to each other with the bolt nut from the connecting box formed as described above. After coating with the epoxy synthetic resin described, the ceramic porous body having injection holes is bonded to the opening surface of the connecting box with a similar epoxy resin adhesive as the surface material, and then provided on the ceramic porous body. It is preferable that a synthetic resin compounded with water glass is injected as a part of the filling material through the injection hole thus formed to foam.
The closing structure of the connecting box formed in the segment, which is characterized by filling the inside of the bolt box to form the closing structure, is a skeleton.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is described in detail below. FIG. 1 is a perspective view of a segment unit used in the present invention. Grooves 12, 12 are formed in the end surfaces 11, 11 of the segment 10 to be joined, and a large number of connecting boxes 14, 14, ... 14 are provided around the segment 10, and the opening 14a of the connecting box 14, 14 ... It is formed to face. This segment 10 is reinforced concrete (R
C), steel or the like, and has a curved shape so as to form a pipe line having a circular cross section after assembly as shown in FIG. In this segment 10, adhesive is applied to the grooves 12 and 12, and the end faces 11 and 11 of the plurality of segments 10 and 10 are joined to each other to form the conduit X shown in FIG.
To form.

FIG. 3 is an enlarged view of the portion A in FIG. 2 in which the end faces 11 and 11 are joined by fastening the bolts and nuts 15 from opposite connecting boxes 14 and 14 formed on the peripheral edges 13 and 13. It The present invention uses this opening 14
A closed structure of a. FIG. 4 shows a perspective view thereof. 41 is a ceramic porous body, 42 is a filling resin injection port, and 43 is the injected foam-hardening resin. FIG. 5 is a sectional view of the bolt box. Reference numerals 51 and 52 are locations where the epoxy resin of the present invention is coated.

The ceramic porous body has a three-dimensional network structure and has a bulk specific gravity of 0.3 to 0.9 and 4 to 30 pores per 2.5 cm. To obtain this ceramic porous body, a three-dimensional reticulated synthetic resin foam is added to a sludge made of non-oxide ceramic powder such as silicon carbide and silicon nitride and oxide ceramic powder such as alumina, mullite, silica and clay mineral. For example, it can be obtained by immersing a polyurethane foam having a three-dimensional network structure, etc., removing excess mud by means of rolls, centrifugation, etc., and then drying and firing.

The bulk density of the ceramic porous body is 0.3.
~ 0.9. When the bulk specific gravity is 0.3 or less, the strength is insufficient and the filling foaming resin injected cannot withstand the foaming pressure. The upper limit is not specified, but it is 0.9 or less in order to take advantage of the characteristics of light weight. The limitation on the number of pores is defined by the adhesiveness, and preferably 4 to 30 per 2.5 cm, and more preferably 8 to 20 in terms of workability and performance.
When the number is 4 or less, the foamed resin, which is the filler to be injected thereafter, has a small resistance to intrusion into the ceramic porous body, and leaks to the surface side to cause uneven filling. This is because if the number is 30 or more, the foamed resin does not sufficiently penetrate into the inside, resulting in insufficient adhesion.

The ceramic porous body of the present invention may have one surface coated with a ceramic slurry having the same composition as the ceramic porous body to cover the pores. In this case, the coating method can be performed by using ceramic mud having the same composition as the ceramic porous body, spraying or brush coating. Further, when it is desired to eliminate water permeability, it is preferable to coat with glaze or frit.

The number of holes in the thickness direction of the ceramic porous body may be different between the opening and the filling side, and the number of holes may be smaller in the segment opening side than in the filling side. The combination is such that the number of holes is opening side / filling side> 1. For example, a half-thickness three-dimensional network structure having different numbers of holes is bonded to a three-dimensional network structure having many holes so that the three-dimensional network structure having many holes is located on the segment opening side. It is also possible to obtain a ceramic porous body by pasting with an agent or the like, or by immersing it in the above-mentioned ceramic slurry, or by dipping each three-dimensional synthetic resin foam in the ceramic slurry and then pasting them together.

Further, in order to satisfy requirements such as surface makeup, smoothness, and leakage of the filler, a non-porous body may be bonded to the opening side on the porous body and combined. Examples of the non-porous body include an inorganic molded plate such as a calcium silicate plate and a slate plate, a synthetic resin plate, or a non-woven fabric.

The filling material to be poured is a hardening type, and after filling, it is made to come into contact with a bolt box material such as concrete to be hardened. It is sufficient that the foamed synthetic resin is curable, has light adhesiveness, and can be filled with a small amount of voids without gaps. However, in order to maintain the foaming property in the dew condensation state, it is preferable to use a foaming resin filler and a hard urethane foam containing water glass as a part of the resin. In this case, the content of water glass is 1 to 60 parts by weight, and more preferably 5 to 40 parts by weight, based on 100 parts by weight of the total polyol. If the blending amount is within this range, sufficient foaming occurs even on the dew condensation surface, and it penetrates into the mesh of the segment surface and the ceramic porous body of the surface material to firmly bond. However, if it is 1 part by weight or less, no foaming occurs on the dew condensation surface, and if it is 60 parts by weight or more, a foamed product cannot be obtained and powdered.

Since water glass is an aqueous solution of sodium silicate, when it is mixed with water glass, it has a high affinity with a water film when it is present in the urethane foam stock solution. In addition, water is initially blended in the stock solution in an amount that is involved in the reaction, but since it is possible to prevent the blending balance from being disrupted by the addition of dew condensation water, the desired effect product can be obtained. .

One of the methods for obtaining the structure of the present invention is to coat all the inner wall surfaces of the bolt box in a dew condensation state with a synthetic resin. The synthetic resin is an epoxy resin type. Adhesives are preferable, and in particular, bisphenol A type liquid resin as a main component and its modified product, primary and secondary amine polyaminoamides as a curing agent, a mixture thereof and an acid anhydride such as phthalic anhydride are preferable. It is preferable to use an equivalent amount or an amount obtained by adding 5% by weight of the main ingredient, and use it after appropriately diluting it with alcohol or the like. When the degree of dew condensation is remarkable, it is preferable to use polyaminoamide as a curing agent.

As described above, the reason why the epoxy-based adhesive having a specific composition is particularly preferable is that the composition-containing system is cured by reacting with water. It hardens even in the presence of water. It has affinity with both resin and water like a surfactant. In addition, since the epoxy resin reacts relatively slowly at room temperature, it is easy to take in water during the curing process, so dew condensation prevents the peeling of the interface between the inside of the box and the adhesive, and the imbalance of the composition. And poor reaction can be prevented, and the adhesive strength with the inside of the box can be maintained.

The coating method is not particularly limited, but generally a brush or the like is used for coating. If the adhesion is poor, it is better to wipe off water drops before applying. The coating will prevent leakage of water from inside the segment.

The adhesive used when the bolt box and the surface material pedestal are adhered is usually (when dried).
There is no particular limitation in the case of the above, but in the case of the dew condensation state of the present invention, application is performed using the one that satisfies the same conditions as the epoxy adhesive (claim 6) that maintains the adhesiveness even if water is attached. -It is preferable to adhere.

The ceramic porous body is stuck and adhered to a bolt box, and after curing for 6 hours or more, a curable foamed resin is injected. At this time, if the bolt box is not coated with the synthetic resin, the water glass-containing hard foam resin is always injected. Further, this water glass-containing hard foam resin can of course be applied to the case where the bolt box is coated with a synthetic resin.

[0023]

EXAMPLES The present invention will be described in more detail below by showing examples, particularly in the case where the bolt box has dew condensation, that is, water, but the present invention is not limited to the examples.

Example 1 (1) Preparation of Ceramic Porous Body 13 holes 120 × 120 × 4 mm thick having a hole of 12 mmφ in the center for injection of filled foamed resin 13 /
A three-dimensional reticulated synthetic resin body (reticular skeleton polyurethane foam) of the same size as 25 mm and having 40 holes / 25 mm is bonded with an aqueous adhesive, and 50 parts by weight of silicon carbide, 30 parts by weight of alumina, and 20 parts by weight of kibushi clay. Part and 20 parts by weight of water. Next, the three-dimensional reticulated synthetic resin body was pulled up from the mud and the excess mud was removed with a roll. Then, after drying at 70 ° C. for 3 hours, it was baked at 1300 ° C. A ceramic porous body having a bulk specific gravity of 0.7 was obtained.

(2) Preparation of Bolt Box, Pretreatment Water was applied to the bolt box to cause dew condensation, and epoxy resin was applied and coated with a brush inside the bolt box. The epoxy resin is easy to apply and has low viscosity,
In addition, since the adherend in the dew-condensed or wet state must have a sufficient adhesive force, the following composition is prepared as an example in the range as described in claim 6. It was carried out. (Main agent) (Unit: parts by weight) Epoxy resin Adeka Resin EP4300 (Asahi Denka Kogyo Co., Ltd.) 60 parts Viscosity reducing agent Eposil L (Anchor Chemical Co., Ltd.) 10 parts (Curing agent) Polyamine amide Sunmide P117 (Sanwa Chemical Co., Ltd.) Industry Co., Ltd. 30 parts Portland Cement (Sumitomo Cement Co., Ltd.) 30 parts Epositol L (Anchor Chemical Co., Ltd.) 10 parts

(3) Injection of Foamed Curing Resin After the above epoxy resin is applied to the entire inner surface of the bolt box by using a brush, a foamed curable resin A (A: water glass) is used as a filler in the bolt box. (Unblended resin) was used to inject a resin liquid in an amount of 20% increase of the internal volume of the bolt box through a hole of an injection hole formed in the surface material in advance, and the bolt box was closed. The injectable foamable synthetic resin used here is a resin for rigid polyurethane foam (manufactured by Bridgestone, two-component RD5206 / RD1).
00) was used. In the case of the resin A, the filling amount was 20% larger than the volume of the container of the bolt box. In addition,
In this embodiment, the surface material pedestal of the bolt box (surface area 1
20 × 120 × 5 mm = 18 cm ² ) and the surface material are also bonded to each other by using the same epoxy resin as the above composition with a brush.
Although it has been applied, any other adhesive may be used as long as it does not hinder the adhesion, but preferably the epoxy adhesive shown in the present invention used on the inner surface of the bolt box ( It is preferred to use the same as in claim 6).

[Example 2] In Example 1, as the (3) foam-curing resin, the resin (A) for the hard polyurethane foam used in Example 1 was mixed with 20 parts by weight of water glass to prepare the filler (B). The bolt box was closed in the same manner as in Example 1 except that the injection was carried out as a 30% increase in the container volume of the bolt box.

Comparative Example 1 In the above-mentioned Example 2,
The same procedure as in Example 2 was carried out except that the inner wall surface of the bolt box in (2) was not coated with epoxy resin or the like.

Comparative Example 2 In the above-mentioned Example 1,
The same procedure as in Example 1 was carried out except that the inner wall surface of the bolt box in (2) was not coated with epoxy resin or the like.

In this example and comparative example, as described above, water was applied to form a dew condensation state.

Then, the inside of the bolt box was observed after 2 hours for each of the examples and comparative examples. The results are shown in Table 1.

[0032]

[Table 1]

[0033]

As described above in detail, according to the present invention, a combination of a foamed resin and a ceramic porous body is used as a plugging material for a connecting bolt box and the inside of the bolt box is coated with a specific epoxy resin adhesive. By the treatment, it was possible to obtain a good foaming property even in a dew condensation state, and to obtain a plugged material having a strong adhesiveness with the surface material.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a segment used in the present invention.

FIG. 2 is a perspective view showing an example of a conduit used in the present invention.

FIG. 3 is an enlarged view of FIG. 2A.

FIG. 4 is an explanatory diagram of the present invention.

FIG. 5 is a schematic view showing a cross section of a bolt box.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-6-294294 (JP, A) JP-A-7-149581 (JP, A) JP-A-8-333993 (JP, A) JP-A-2- 24492 (JP, A) JP-A-8-177394 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21D 11/08

Claims (7)

(57) [Claims] 1. A structure for closing a bolt box provided between segments in connecting RC (reinforced concrete) segments , which is arranged and bonded as a surface material.
The ceramic porous body with injection holes and the surface material
A foaming hard material that is filled as a filling material through the entry hole and is filled with foam.
Resin and the inner wall surface of the bolt box
An RC segment bolt box closing structure, which is made of a synthetic resin . 2. The RC segment bolt box closing structure according to claim 1, wherein the synthetic resin used for the coating is an epoxy adhesive. 3. The ceramic porous body used as the surface material is made of a foamable synthetic resin having a three-dimensional network skeleton structure as a base material, and ceramic mud is adhered to the base material and fired. The RC segment bolt box closing structure according to claim 1. 4. A ceramic porous body used alone as the surface material, or a ceramic porous body laminated with a calcium silicate plate or the like, is used, according to claim 1 or 3. RC segment bolt box closing structure. 5. The substrate of the porous ceramic body to be used as the surface material, according to claim 1 or 3, characterized in that a polyurethane foam resin having a three-dimensional network skeleton structure,
4. The RC segment bolt box closing structure according to any one of 4 above. 6. An epoxy adhesive for coating the inner wall surface of the bolt box, a bisphenol A type liquid resin as a main component and its modified product, and primary and secondary amines, polyaminoamides, and anhydrous phthalates as a curing agent. Either or both of acid anhydride such as acid is used as the main material / curing agent =
The RC segment bolt box closing structure according to claim 2, wherein a mixture of 1/1 to 1.05 / 1 (weight ratio) is used. 7. The foamable curable resin to be injected and used as the filler is a rigid urethane foam resin or phenol foam alone, or a rigid urethane foam resin or phenol foam containing water glass as a part thereof. The RC segment bolt box closing structure according to claim 1.