JPH10148096A - Pipe and culvert construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce seismic force working to a tunnel (a pipeline) while simplifying the floating preventive construction works of an internally inserted pipe, to prevent the generation of separation of a filling material, and to improve aseismicity. SOLUTION: In the method of construction, an internally inserted pipe 3 is arranged into an excavated pipeline while the internally inserted pipe 3 is fixed by internally-inserted pipe fixing members 17, and a void between the outer circumferential surface of the internally inserted pipe 3 and the inner circumferential surface of the pipeline is filled with a filling material and a pipe and a culvert are constructed. The internally inserted pipe 3 is fixed by using a material, in which a resin foam is solidified with cement, as the internally-inserted pipe fixing member 17 at that time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a sewer, such as a sewer or sewer, in which a space between an excavation pipeline (tunnel) and an inner tube is secondary-lined with concrete or the like.

[0002]

2. Description of the Related Art Conventionally, in the construction of sewage pipes and the like, Japanese Patent Publication No. Hei 6-74714 and Japanese Unexamined Patent Publication No.
No. 97 or JP-A-62-35187, the inner peripheral surface of the excavated tunnel is covered with concrete, and the outer peripheral surface of the insertion tube inserted into the tunnel is covered with concrete. The gap between the inner peripheral surface of the tunnel and the inner peripheral surface of the tunnel is filled with concrete or air mortar having an air volume of about 50% as a filling material. Then, when filling the filling material, the actual open flat 4-1 is used to fix the intubation.
As disclosed in Japanese Patent No. 08695, the intubation tube was fixed to the tunnel by a support such as wood.

[0003]

However, in order to improve the seismic resistance, it has been considered to use an elastic body as the filling material. However, since the supporting material for fixing the intubation tube is not flexible, the use of an elastic material has been considered. Sometimes the support material could break the intubation.

Further, when concrete is used as a filling material for constructing a sewer, there is a problem that a large amount of heat is generated at the time of hardening and the temperature inside the tunnel becomes high, thereby deteriorating the working environment. In addition, when air mortar is used as the filling material, fine bubbles contain 50% by volume ratio, and if the mortar is not yet solidified at the time of casting, the bubbles adhere to each other depending on construction conditions, and air is separated from the mortar. there is a possibility. In addition, the air mortar shows almost no elastic behavior, and has a problem that the seismic force is directly transmitted to the intubation to give an impact to the intubation. further,
Increasing the volume ratio of the air bubbles in order to obtain elastic physical properties has a problem that air is more easily separated and stability is lost during construction. Furthermore, since the specific gravity is large, the buoyancy acting on the intubation is extremely large, and large-scale levitation prevention measures are required.

The present invention has been developed in view of the above points, and an object of the present invention is to alleviate the seismic force acting on a tunnel (pipe) and to simplify the work for preventing the floating of an inserted tube. It is an object of the present invention to provide a method of constructing a sewer which can be made into a material, does not cause material separation of an embedded material, and can further improve earthquake resistance.

[0006]

The present invention has the following configuration in order to effectively achieve the above object. That is, according to the method for constructing a sewer according to the present invention, an inner tube is piped into a pipe formed by excavation, and the inner tube is fixed by an inner tube fixing member. In the construction method of constructing a sewer by filling a gap material with an inner peripheral surface with a filling material, the intubation is fixed using a resin foam solidified with cement as the intubation fixing member. The configuration is as follows.

According to a second aspect of the present invention, there is provided a method for constructing a sewer.
In the structure of the first aspect, a material obtained by mixing a cement or an adhesive with a granular resin foam is used as the filling material.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. First, a sewer constructed by the sewer construction method of the present invention will be described.
Is a pipe having a maximum dimension of about 3 mm as a filling material 5 in a gap 4 between the outer peripheral surface 3a of the inner tube 3 and the inner peripheral surface 2a of the conduit 2 It is constructed by filling a mixture of granular resin foam 6 and cement 7. Reference numeral 8 denotes a concrete layer lining the inner peripheral surface 2a of the pipe 2 before inserting the insertion tube 3 into the pipe 2 formed by excavation.

The construction work of the sewer 1 will be described in further detail. As shown in FIG. 2, a cement mixing plant 9 is installed on the ground, and a granular styrofoam (an example of a granular resin foam 7) is installed on the ground. A small amount of cement (coagulant) is added to form the filling material 6, and the filling material 6 is pressed by a pressure pump (not shown) into the outer peripheral surface 3 a of the insertion tube 3 in the pipe 2 (or tunnel) and the pipe 2. The material is injected into the gap 4 between the inner peripheral surface 2a and the concrete layer 8. The implantation includes an outer surface implantation method shown in FIG. 2 and an inner surface implantation method shown in FIG.

The filling material 5 of this example has a lower fluidity than the conventionally used air mortar, so that it can be easily worked at the time of pouring by the following measures. That is, in the case of the outer surface injection method shown in FIG. 2, the injection is performed while the injection tube 10 is pulled out. In the case of the inner surface injection method shown in FIG. 3, the interval between the injection ports 12 provided in the intubation tube 3 is reduced (from 5 to 1).
(0 m pitch), and the injection is performed while moving the injection port 12 in order from the back.

It is also possible to transport the cement to be the filling material 5 and the granular styrene foam to the injection point by another pipe and mix them immediately before. This enables long-distance conveyance without causing material separation. That is, the cement is pumped and the granular styrofoam is pneumatically conveyed using a blower. The specific gravity can be arbitrarily set to some extent depending on the amount of cement, but is preferably about 0.3 to 0.6. (The elastic properties after curing are shown below) However, the physical properties change depending on the blending of the cement.

[0012] When the cement hardens, the insert 5 can build an insert 5 which behaves as an elastic body, and reduces the seismic force acting on the pipeline 2 (or tunnel) to reduce the intubation. 3 can be protected. In addition, since the specific gravity of the hollow material 5 when it is not solidified is small, the buoyancy acting on the intubation tube 3 can be reduced to about 1/2, and the buoyancy prevention work can be simplified. Furthermore, since the intermediate material 5 can be constructed with a small amount of cement and can keep the calorific value low, construction in a favorable working environment becomes possible.
In addition, since granular styrofoam is used without using air, even if the amount of cement is reduced, bubbles do not stick together and cause material separation. Furthermore, since styrene foam is granular, it has good fluidity and can be spread to every corner during injection.

FIG. 4 is a cross-sectional view showing the state of construction of another sewer 1. In the sewer 1, an inner tube 3 is arranged in a pipeline 2 (tunnel) and an outer peripheral surface of the inner tube 3 is shown. In the gap 4 between 3a and the inner peripheral surface 2a of the conduit 2, the maximum dimension of the filling material 5 is about 3 mm through the concrete layer 8 by primary lining (see FIG. 6).
It is constructed by filling a mixture of an adhesive 13 and a granular resin foam 7 having a size of.

In the construction work of the sewer 1, as shown in FIG. 5, measures are taken to prevent water from entering the pipeline 2, and a certain amount of air circulation is required for curing the adhesive. A blower pipe (about 13 A, about 2 or 3 pipes) is installed on the inner surface of the pipe 2. Further, a transport vehicle 14 on which the granular Styrofoam is mounted is installed on the ground, and the granular Styrofoam is sent from the ground into the pipeline 2 by the blower 13. External injection method (see Fig. 2)
In the case of the construction, the injection hose 15 inserted into the gap between the pipe line 2 and the insertion tube 3 can be reliably and easily filled if it can be wound up before the injection section. In addition, in the case of the inner surface injection method (see FIG. 3), filling can be surely performed when the injection hole interval is 5 to 10 m. And
The adhesive is fed through another injection hose from just before the injection section. After curing of the adhesive, the adhesive exhibits the same physical properties as the styrofoam lump.

Elastic modulus 2-3 (kgf / cm ² ) Strength 0.2-0.3 (kgf / cm ² ) However, physical properties vary depending on the expansion ratio of the styrene foam used.

By using the above-mentioned infill material 5, it is possible to construct the infill material 5 which shows an elastic behavior rather than hardening the styrofoam with cement, and to alleviate the seismic force acting on the pipeline 2, thereby protecting the intubation tube 3. can do. In addition, even before the hardening, there is almost no liquid behavior and the specific gravity is very light, about 0.01 to 0.02, so that buoyancy hardly occurs in the intubation tube 3 and buoyancy prevention work is not required. And since there is almost no heat generation at the time of hardening as compared with the case where cement is used, construction can be performed in a favorable working environment. Further, the granular Styrofoam can be easily transported over a long distance in a tunnel by a blower, and the equipment can be simplified.

Next, an example of a sewer construction method according to the present invention will be described with reference to FIG. In the construction of each sewer 1 as described above, as the intubation fixing member 17 for fixing the intubation 3 when filling each of the above-mentioned infill materials 5, an intubation using a resin foam solidified with cement is used. 3 is fixed.

The culvert construction method will be described in further detail. First, the buoyancy acting on the intubation tube 3 at the time of filling the inlay material is calculated, and the size, strength, and number of installation points of the intubation fixing member 17 are set so as to withstand the buoyancy. To determine. Then, the intubation fixing member 17 having a predetermined strength and shape is formed of styrofoam, which is a resin foam, and cement concrete.
It is fixed between the pipes 2. In the drawing, reference numeral 18 denotes a band for preventing floating, 19 denotes a pipe pedestal, 20 denotes a height adjusting member, 21 denotes a turnbuckle, and 22 denotes a shackle. The strength and elastic modulus of the intubation fixing member 17 can be adjusted to some extent arbitrarily by the amount of cement. At this time, the specific gravity is 0.3-0.
About 8 is preferable. (Shows the following elastic properties after curing) However, the physical properties change depending on the blending of the cement.

By mixing styrofoam and cement concrete as described above, the intubation fixing member 17 showing the behavior of the elastic body can be obtained. Therefore, by using this intubation fixing member 17, concentrated stress is not generated in the fixing portion (location where the intubation fixing member 17 is attached) during an earthquake, and the earthquake resistance is also improved.

[0020]

As is apparent from the above description, in the method for constructing a sewer according to the first aspect of the present invention, a resin foam is cemented as an insertion tube fixing member for fixing an insertion tube when filling a filling material. Since the intubation is fixed using the solidified material, the intubation fixing member shows the behavior of an elastic body, and concentrated stress does not occur in the fixing part of the intubation during an earthquake, improving seismic resistance be able to.

Further, in the method for constructing a sewer according to the second aspect of the present invention, the behavior of the elastic body is exhibited when a mixture of cement and a granular resin foam is used as the filling material in the lining of the intubation. The inlay can be built, the seismic force acting on the pipeline can be reduced, and the intubation can be protected. In addition, since the specific gravity when the inner material is not solidified is small, buoyancy prevention work for the intubation can be simplified. Furthermore, since this cementing material can be constructed with a small amount of cement, the calorific value can be suppressed to a low level, and construction in a favorable working environment becomes possible. Further, since the granular foam is used without using air, even if the amount of cement is reduced, the bubbles do not stick to each other and cause material separation. Furthermore, since the resin foam is granular, it has good fluidity and can be spread to every corner during injection.

Further, in the case of using a mixture of a granular resin foam and an adhesive as the filling material in the lining of the intubation tube, the filling material which shows the behavior of the elastic body is harder than the case where the resin foam is hardened with cement. The seismic force acting on the pipeline can be reduced to protect the intubation. In addition, since the specific gravity of the inlay material is very light, buoyancy hardly occurs in the intubation, and buoyancy prevention work is not required. Furthermore, compared to the case where cement is used, heat is hardly generated at the time of hardening, so that construction can be performed in a favorable working environment. In addition, the granular resin body can be easily transported in a pipe (tunnel) over a long distance by a blower, and the equipment can be simplified.

[Brief description of the drawings]

FIG. 1 is a sectional view of a sewer according to the present invention.

FIG. 2 is an explanatory view showing construction by an outer surface injection method according to the present invention.

FIG. 3 is an explanatory view showing construction by an inner surface injection method according to the present invention.

FIG. 4 is a sectional view of another sewer according to the present invention.

FIG. 5 is an explanatory view showing an injection state of the filling material by the outer surface injection method according to the present invention.

FIG. 6 is an explanatory diagram showing a connection relationship between a resin foam and an adhesive.

FIG. 7 is an explanatory view for explaining the construction of the fixed part of the sewer according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sewer 2 Pipeway 2a Outer peripheral surface 3 Inner tube 3a Inner peripheral surface 4 Air gap 5 Filling material 7 Resin foam 8 Cement 17 Intubation fixing member

Claims (2)

[Claims] 1. An intubation is piped into a pipe line excavated, and the intubation is fixed by an intubation fixing member, and a gap between an outer peripheral surface of the intubation pipe and an inner peripheral surface of the conduit is filled with an infill material. A method for constructing a sewer by fixing a tube in which a resin foam is cemented with cement as the above-mentioned intubation fixing member. 2. A method for constructing a sewer according to claim 1, wherein a material obtained by mixing cement or an adhesive with a granular resin foam is used as the filling material.