JP2023062342A - Method of underground installation of large pipes and bottomed buried pipes - Google Patents

Abstract

To carry out burial and installation of a buried pipe smoothly and surely with a simple combination of processes, and to surely prevent water leakage, etc., after installation.SOLUTION: A method of underground installation of a large pipe consists of the processes of: press-fitting and excavating a pre-excavation pipe, whose diameter is larger than that of a buried pipe, into the ground prior to burial of the buried pipe so that a pipe wall position includes the buried pipe outer diameter in plan view; removing excavated soil inside the pipe while excavating the pre-excavation pipe; inserting a bottomed buried pipe into a pipe space of the excavation pipe after the pre-excavation pipe has been pressed in to the planned depth, to arrange the pre-excavation pipe and the buried pipe in a double pipe configuration; and extracting the pre-excavation pipe after inserting the buried pipe to a predetermined depth. Interior works and utility according to a purpose of use in the buried pipe can be precisely performed by the ground works, and the work processes can be simplified, work can be shortened, and water sealing performance can be improved.SELECTED DRAWING: Figure 3

Description

The present invention is a large-scale pipe land that can form a temporary evacuation shelter for people and goods in the event of natural disasters such as earthquakes, tsunamis, typhoons, and man-made disasters, a storehouse for storing goods and food, and a multi-purpose space for leisure. It relates to a medium erection method and a bottomed buried pipe.

Applicant can install temporary evacuation shelter for people and goods, shelter for storage of goods and food, leisure and other multi-purpose space in the event of natural disasters such as earthquakes, tsunamis and typhoons or man-made disasters in a relatively short period of time and at a low cost. Patent Document 1 proposes a large-sized bottomed tubular body that can be constructed easily, occupies a small planar space, and is less affected by ground structures and equipment.

Japanese Patent No. 6585787

In Patent Document 1, after a large pipe is pressed into the ground, underwater concrete is supplied from the upper end opening of the pipe and poured into a recess below the lower end of the large pipe to form a concrete base outside the lower end of the pipe. After that, the pipe is lowered to place a bottom cover with a filling hole at the lower end of the pipe, and mortar is injected into the gap between the bottom surface of the bottom cover and the concrete base outside the pipe through the filling hole to form the bottom. The bottom of the tube is constructed by integrating the cover and the concrete base outside the tube.

In this method, when a large pipe is erected underground, it is possible to weld the end of the bottom cover to the inner wall of the pipe while suppressing the ingress of water into the pipe at the lower end of the pipe after the pipe is pressed into the ground. can. However, after the tubular body is pressed into the ground, concrete is supplied, once the concrete is put into the concave portion below the lower end of the large tubular body, and then mortar is injected from the filling hole of the bottom cover arranged on the lower end side of the tubular body. Since the mortar is injected into the gap between the lower surface of the bottom lid and the concrete base outside the pipe, the work must be done without checking the condition of the concrete base on the lower surface of the bottom lid. In addition, the mortar injection work from the filling hole of the bottom cover is work in a narrow space in a limited space, and work setup and injection work take time and work costs. In addition, since filling of the gap between the lower surface of the bottom lid and the concrete base outside the pipe cannot be confirmed after pouring, there is a problem in that the mortar is poured more than necessary, resulting in unnecessary costs for the entire work and materials. On the other hand, the applicant proposes a process of press-fitting the pipe body vertically into the ground while discharging the soil inside the pipe body with ribs attached to the inner wall of the pipe, and A process of pouring ready-mixed concrete up to a height corresponding to the rib part inside the main body, a process of suspending the bottom cover inside the pipe body after the ready-mixed concrete has hardened and placing it on top of the hardened concrete, and a process of placing the outer edge of the bottom cover and the pipe Japanese Patent Application No. 2020-192207 proposes a method for erecting a large-sized bottomed tubular body including a step of welding the inner wall surface of the main body to join the pipe main body and the bottom cover.

This method has the advantage that the filling work can be performed while visually checking the state of the concrete to be poured up to the rib portion in the pipe body, so that the working state and the completion of the work can be confirmed reliably. On the other hand, in this method, after the main body of the pipe is pressed into the pipe to a depth of ten and several meters underground, ready-mixed concrete is poured into the pipe and filled to the required height at the lower end of the pipe. Assistance work inside the pipe by workers is required. In addition, it takes a long time to work, and since it is one of the cast-in-place concrete construction methods, it is difficult to reliably check for water leakage. Furthermore, there is a problem that the work cost increases significantly.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and one of the objects thereof is to achieve smooth and reliable burying work of buried pipes by a combination of simple processes and to prevent water leakage after construction. To provide an underground installation method for a large-sized pipe and a bottomed buried pipe which can surely prevent such accidents. Another object of the present invention is to provide a method for burying a large pipe underground and a bottomed buried pipe, which can complete the work of burying a buried pipe in a short period of time and at low cost.

In order to solve the above problems, the present invention is a method for erecting a large-sized buried pipe that is vertically buried in the ground so that the pipe inner space can be used for various purposes. 20, a step of press-fitting and excavating the preceding excavation pipe 20 into the ground prior to burying the buried pipe 1 so that the pipe wall position includes the burial outer diameter of the buried pipe 1 in plan view; a step of discharging the excavated soil in the pipe at the same time as the excavation of 20; and the buried pipe 1 are arranged in a double-pipe shape, and after the buried pipe 1 is inserted to a predetermined depth position, the preceding excavation pipe 20 is pulled out. be.

At that time, the inner bottom of the bottomed buried pipe 1, which is inserted and lowered into the pipe inner space 100 of the preceding excavation pipe 20 after the preceding excavation pipe 20 is press-fitted to the planned depth, has an anti-buoyancy weight against the buoyancy from the underground side. should be provided.

In addition, a swivel inserter 401 is provided on the outside of the bottom of the bottomed buried pipe 1, and the bottomed buried pipe 1 is buried after the preceding excavation pipe 20 of the bottomed buried pipe 1 is inserted and lowered into the pipe inner space 100. It is more preferable to include a step of turning the tube 1 itself about its longitudinal axis.

In addition, the present invention is a bottomed buried pipe 1 that is inserted and lowered into the pipe inner space 100 of the preceding excavation pipe 20 after the preceding excavation pipe 20 has been press-fitted to the planned depth. An anti-buoyancy weight section 30 is provided and is constructed from a bottomed buried pipe.

In this case, a swirling biter 4 may be provided on the outside of the bottom so that the tip side faces downward.

According to the method of erecting a large bottomed pipe body and the bottomed buried pipe of the present invention, the work process can be greatly simplified by improving the pipe body, and each work itself is simple and clear, and the work time can be greatly shortened. Furthermore, it is possible to greatly reduce the work cost.

FIG. 2 is an explanatory plan view showing the positional relationship between a pre-excavated pipe and a buried pipe according to an embodiment of the method for erecting a large pipe underground and the buried pipe with a bottom according to the present invention. It is front explanatory drawing which shows the state which makes the advance drilling pipe|tube concerning embodiment of this invention press-fit into the ground using a tubing apparatus. 3 is a perspective illustration of a tubing apparatus for performing the underground press fit of the pre-drilled pipe of FIG. 2; (a) is an explanatory view showing a state in which a bottomed buried pipe is inserted and lowered into a preceding excavation pipe that has been discharged. (b) is a partially omitted front explanatory view of a bottomed buried pipe. (a) is an explanatory view showing a state in which a buried pipe is arranged in a double-pipe shape inside a pipe of a preceding excavation pipe. (b) is an explanatory diagram showing a double-pipe-like gap set between the preceding excavation pipe and the buried pipe. FIG. 10 is an explanatory view showing a state in which the outer preceding drilling pipe is pulled up to the ground after the buried pipe is arranged in the pipe of the preceding drilling pipe in a double pipe shape. FIG. 4 is an explanatory diagram showing a state in which cement milk is poured around the buried pipe after the preceding excavation pipe is pulled up to form a solidified portion.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a large pipe underground installation method and a bottomed buried pipe according to the present invention will be described below with reference to the accompanying drawings.

A large-sized buried pipe with a bottom used in the underground installation method for a large-sized pipe according to the present invention is buried and erected in order to use the space inside the pipe for various purposes. For example, it is used as an evacuation shelter from earthquakes and other natural disasters, wars and other man-made disasters, and the like. It can also be used as a storehouse for documents, jewelry, magnetic tapes, films and other electronic recording media. In addition, it is used as a space-utilizing tubular body for storage of chemicals, drugs, water, other liquids, other valuable materials, and other arbitrary uses. A large-sized buried pipe with a bottom according to the present invention is a hollow bottomed tubular body having a space inside and a closed bottom. The tubular body is, for example, a tubular body having a diameter of about 2 m to 5 m and a depth of 5 m to 20 m or more, which is buried in the ground, and is made of volcanic ash or clay. It can be effectively used not only in the ground of the soil, but also in areas where the ground contains a lot of water and boulders. The underground installation method for large pipes of the present invention can be effectively utilized in these areas.

Since the structure of the members of the large-sized bottomed tubular body of the present invention differs depending on the erection process, the large-sized bottomed tubular body will be described together with each process.

[First step]
1 to 7 illustrate an embodiment of the method for erecting large pipes underground according to the present invention. FIG. 1 is an explanatory plan view showing the press-fit positional relationship between a preceding excavation pipe 20 that is press-fit into the ground in a substantially vertical direction and an underground pipe 1. The outer solid line indicates the preceding excavation pipe 20 . In this method, the preceding excavation pipe 20 is forced into the ground G where the erection position is set, and the soil is discharged, and the buried pipe 1 to be finally erected is inserted and lowered into the space 100 inside the preceding excavation pipe 20, After that, the preceding excavation pipe 20 is pulled up to the ground to erect the large pipe.

As shown in FIGS. 2, 4 and 5, the pre-drilling pipe 20 is a steel pipe called a so-called casing tube, which is a cylindrical steel pipe with both ends (upper and lower in the drawings) opened. If a single steel pipe can reach the desired underground depth, it is composed of one steel pipe, but it is common to use a plurality of steel pipes connected together. Normally, a unit pipe having a diameter of several meters and an axial length of several meters is gripped by a tubing device and pressed into the ground while being rotated in a direction around the axis. In a state in which one unit pipe is not completely press-fitted and lowered in the tubing apparatus, pipe ends of other unit pipes are connected to each other by welding or an arbitrary fastening means in a water-tight state inside and outside the pipe, and are successively press-fitted and lowered. For example, by using a coupling member, the pipe ends of unit pipes that face each other vertically are screwed together, and a plurality of pipe bodies are connected to form an integrated pre-excavation pipe having a length of, for example, about 20 m, and are press-fitted and lowered. may In this embodiment, as shown in FIG. 4(b), the inside and outside of the pipe are welded and connected in advance on the ground at the welded portion 10 in order to maintain watertightness. The leading drilling pipe 20 has a plurality of drilling bits 21 attached to its lower end, and digs downward while rotating or turning drilling as the tubing device 40 rotates about its axis. As a result, even in the ground where there are many boulders, it is possible to reliably excavate downward while crushing the bedrock or the like with the excavation bit 21 . The excavation bit portion 21 is constructed by fixing a plurality of excavation bits 21a in an annular manner to the lower end edge of the pipe body at intervals. As will be described later, in order to press-fit the pipe body 1 into the ground, the pipe body 1 is pressed into the ground while being rotated in the direction around the longitudinal axis of the pipe body by a dedicated machine. Even if there is a hard bedrock layer or the like during the press-in, it is possible to cut it down while rotating the pipe body and enter the ground.

In FIGS. 2 and 3, a tubing device 40 is installed on the ground, and the preceding drilling pipe 20, which has its axis center vertically arranged in the center of this tubing device 40, is gripped with a chuck, and the preceding drilling pipe 20 is rotated. push it into the ground. In FIG. 2, the tubing apparatus 40 includes a rotating body (not shown) for rotating a tube supported by a body frame 41, an elevating frame that rotatably supports the rotating body, an elevating device, a chuck member, a chuck cylinder, and the like. A rotating tubing device. A receiving plate 42 is placed in advance on the ground on the lower surface of the tubing device 40 . Further, counterweights 43 are arranged so as to sandwich the tubing device 40 from both sides. The counterweight 43 stabilizes the entire tubing apparatus 40 against backlash movement during press-in operations of large tubes.

The first step in the method of burying a large pipe in the ground according to the present invention is to excavate a pre-excavated pipe having a diameter larger than that of the pipe to be buried. Prior to burying the buried pipe 1, the pre-excavated pipe 20 is press-fitted and excavated into the ground. That is, for example, in FIG. 1, the rotation center of the tubing device 40 is set at the center position Q corresponding to the ground plane position of the pipe 1 to be finally buried and erected, and the diameter of the pipe 1 to be buried is larger than that of the pipe 1 to be buried. , the center position of the preceding excavation pipe 20 is set, and the preceding excavation pipe 20 is press-fitted and buried. The preceding excavation pipe 20 and the buried main pipe 1 do not necessarily have to be set at concentric positions. After the pre-excavation pipe 20 is press-fitted and excavated, it is sufficient if there is enough space to insert the pipe 1 for main burial into the pipe 20 . In the embodiment, in order to facilitate understanding, the buried main pipe 1 and the preceding drilling pipe 20, which are inserted downwardly into the preceding drilling pipe, are separated from each other by a required distance D (Fig. 5(b) )) are formed and press-fitted like circles with different diameters at concentric positions so as not to come into contact with the preceding drilling pipe 20 . As a result, prior to burying the buried pipe 1, the pressure-insertion position of the preceding excavated pipe 20 is the position of the pipe wall of the preceding excavated pipe that includes the burial outer diameter of the buried pipe 1 in plan view, as shown in FIG. The pre-drilling pipe 20 is press-fitted into the ground.

Prior to the construction of the buried main pipe 1, the pre-excavation pipe 20 is excavated prior to excavation to form an underground space for inserting and arranging the buried pipe 1. form 100; Then, it functions as a collapse prevention pipe so that the peripheral wall of the vertical hole formed when inserting and arranging the buried main pipe in the space inside the pipe after excavation does not collapse.

[Second step]
Simultaneously with rotary press-in excavation of the preceding excavation pipe 20 by the tubing device 40, excavated soil is discharged into the pipe by excavation through the excavation bit 21 at the lower end of the preceding excavation pipe. That is, in FIG. 30 , when the preceding excavation pipe 20 is rotated and pressed into the ground by the tubing device 40 , the soil inside the preceding excavation pipe 20 is discharged to the ground side by the excavator 44 at the same time. In the embodiment, the excavator is suspended by a heavy machine such as a crawler crane, and a well-known large-diameter excavating machine such as a grab hammer that strikes the ground by a falling force and grabs the earth and sand is used. When excavating the preceding excavation pipe, as the depth is gradually increased, water often seeps into the pipe from the ground at the lower end of the pipe body. The seepage of water can be several meters deep or tens of meters deep.

[Third step]
In FIG. 4, after the preceding excavation pipe 20 is press-fitted to the planned depth while discharging the inside of the pipe by the excavator 44, the bottomed buried pipe 1 as the buried main pipe is inserted and lowered into the pipe interior space of the preceding excavation pipe 20. The pre-excavation pipe and the buried pipe are arranged in a double pipe shape (see Fig. 5). In FIG. 4(b), the bottomed buried pipe 1 placed inside the preceding drilling pipe 20 is a steel pipe called a casing tube, which is made of a steel cylindrical pipe with one end open on the upper end side. be. Constructed by connecting multiple steel pipes.

The bottomed buried pipe 1 has a bottom wall 2 attached in advance by manufacturing on the ground side so that the lower end keeps the watertight state and closes the inside and outside. Furthermore, an anti-buoyancy weight 3 is provided inside the buried pipe 1 and above the bottom wall 2 , that is, at the inner bottom of the buried pipe 1 with a bottom. The anti-buoyancy weight part 3 prevents seepage water from the underground side of the lower end of the pipe when the bottomed buried pipe 1 is inserted and lowered into the pipe interior space of the preceding excavation pipe after press-fit excavation of the preceding excavation pipe to the planned depth. The bottomed buried pipe 1 is prevented from floating against the buoyancy of the The anti-buoyancy weight section 3 may be any tangible material having gravity that can resist buoyancy, such as steel, concrete, or waste materials thereof. The upper surfaces of these anti-buoyancy weights 3 are provided with arbitrary flooring according to the form of utilization of the pipe interior space.

Further, in the present embodiment, a swivel bite device 4 is provided on the outside of the bottom wall 1 of the bottomed buried pipe 1 with its tip facing downward. After the bottomed buried pipe 1 is inserted and lowered into the pipe inner space of the preceding excavation pipe 20 and landed on the bottom, the swivel bite device 4 rotates the bottomed buried pipe 1 itself around the vertical axis to excavate the ground outside the bottom wall 2 . In this embodiment, as shown in FIGS. 4 to 7, a screw shaft 5 and a spiral blade 6 It consists of a screw blade 7 to which is attached. As long as it is a mechanism that bites into the ground by turning the main body side, a device with an arbitrary structure can be adopted as the turning biter 4 . Moreover, it is good also as a downward long screw blade according to the ground condition of a design depth part. In the embodiment, the upper part of the preceding excavation pipe arranged in a double pipe state and the bottomed buried pipe 1 inserted inside are connected, and the two pipes are turned as one by a tubing device to form the bottomed buried pipe 1. It is designed to secure the state of digging into the ground.

When inserting and lowering the bottomed buried pipe 1 to the inside of the preceding excavation pipe 20 at a concentric position, a unit pipe having a required axial length may be grasped by the tubing device 40 and lowered as it is. It may be inserted and lowered while being supported by a suspension device such as a heavy equipment crane. At this time, the bottomed buried pipe 1 is smoothly and quickly inserted into the preceding excavation pipe 20 while maintaining the gap D between the two pipes.

[Fourth step]
After inserting the buried pipe 1 to a predetermined depth position, the preceding excavation pipe 20 is pulled up. Regarding the work of pulling up the preceding excavation pipe 20 to the ground side, it is also possible to pull it up into the ground while holding it with the tubing device 40 and rotating it in the opposite direction around its axis. In this case, there is no need to change the setup of major equipment, from press-fitting excavation of the preceding excavation pipe 20 , inserting and arranging the buried pipe 1 inside the pipe 20 , and pulling up the preceding excavation pipe 20 . Therefore, the number of man-hours required for the work can be greatly reduced, and the work time can be shortened, the work labor can be reduced, and the work cost can be greatly reduced. It should be noted that the preceding excavation pipe 20 may be pulled up using a heavy machine having a lifting function such as a crane.

In the embodiment, a solidified portion 12 is formed by injecting a fluidized solidifying material such as grout into a gap formed at the trailing edge of the preceding excavation pipe 20, which is integrated with the ground. Note that the formation of the solidified portion 12 may not necessarily be performed depending on the size of the gap between the two pipes and the condition of the ground.

As described above, a storage space for the bottomed buried pipe 1 is formed inside the preceding excavation pipe 20 in the ground, and the bottomed buried pipe 1 is inserted and lowered into the storage space while the peripheral wall is earth-retained, Since it is fixed to the ground side, installation, construction, construction, interior arrangement of various facilities in the bottomed buried pipe 1, and other facilities for utilizing the space inside the pipe can be performed on the ground. In addition, since the entire work and confirmation for stopping water from the bottomed buried pipe 1 can be performed on the ground side, it is possible to take all possible measures against water intrusion into the buried pipe 1. - 特許庁For example, power-equipped elevating racks, construction of ventilation equipment, facilities, fixtures, food, storage facilities for goods, etc., shelters for disaster evacuation, and other arbitrary usage forms are designed on the ground side and specifically installed in the pipe. The buried pipe can be used by inserting and descending in this state.

By carrying out the underground installation of the large-sized pipe in the above-mentioned first to fourth steps, the assembly equipment construction according to the purpose of use in the bottomed buried pipe 1 is performed in advance on the ground side, so that the accuracy of the equipment is high. In addition to being able to maintain the completed state, the work process is simple and the number of processes is small, which contributes to shortening the work time, shortening the construction period, and greatly reducing the work cost. In particular, on the ground side, it is possible to take all possible measures to prevent the intrusion of groundwater from the bottom of the pipe so that the pipe can be used stably and safely.

In addition, an anti-buoyancy weight section against buoyancy from the underground side is provided on the inner bottom of the bottomed buried pipe that is inserted and lowered into the internal space of the preceding drilling pipe after the preceding drilling pipe has been press-fitted to the planned depth. As a result, when the bottomed buried pipe 1 is inserted and lowered into the pipe inner space of the preceding excavation pipe, the buried main pipe 1 does not become unstable due to the buoyancy of the seepage water from the underground side of the lower end of the pipe, and the buried main pipe 1 remains stable. It can be placed in the intra-pipe space of the preceding drill pipe.

In addition, on the outside of the bottom of the bottomed buried pipe, a swivel inserter is provided with the tip side facing downward, and after the preceding excavation pipe of the bottomed buried pipe is inserted and lowered into the pipe interior space, the bottomed buried pipe itself is vertically rotated. By including the step of turning around, after reaching the bottom in the pipe inner space of the preceding excavation pipe 20, by turning around the vertical axis of the bottomed buried pipe 1 itself, it reaches the ground outside the bottom wall 22 via the turning bite. It is possible to make the bottom of the bottomed buried pipe 1 bite into the ground G and integrate it.

Further, the bottomed buried pipe of the present invention is a bottomed buried pipe used in the above-described method for burying a large pipe underground. It is a bottomed burial pipe that is inserted and lowered into a space, and the inner bottom is provided with a buoyancy counterweight against the buoyancy from the underground side. When the pipe 1 is inserted and lowered, the buried main pipe 1 can be stably arranged in the pipe inner space of the preceding excavation pipe without becoming unstable due to the buoyancy of the seepage water from the underground side of the lower end of the pipe.

In addition, since the above-mentioned bottomed buried pipe is provided with a swivel bite device facing downward on the outside of the bottom, the bottomed buried pipe 1 It is possible to integrate the bottomed buried pipe 1 with the ground G by making the bottom part of the bottomed buried pipe 1 bite into the ground outside the bottom wall 2 via the swivel bite device by rotating around its own vertical axis.

The method for erecting a large pipe underground and the buried pipe with a bottom according to the present invention described above are not limited to the configurations of the above-described embodiments only, and are within the scope of the invention described in the claims. , other embodiments may be used.

The method for erecting large pipes underground and the bottomed buried pipe of the present invention can be used as a shelter in the event of an earthquake, tsunami, landslide disaster, wartime danger, etc., and can also be used for the storage of various goods, storage warehouses, etc. can do. It is also possible to create a mushroom cultivation space where the growing conditions for light and air are not so severe.

1 Bottomed buried pipe (buried main pipe)
2 Bottom wall 3 Anti-buoyancy weight 4 Swivel bite device 5 Screw shaft 6 Spiral blade 7 Screw blade 20 Leading drilling pipe 21 Drilling bit 21a Drilling bit 40 Tubing device 44 Excavator D Gap between both pipes G Ground

The present invention is a large-scale pipe land that can form a temporary evacuation shelter for people and goods in the event of natural disasters such as earthquakes, tsunamis, typhoons, and man-made disasters, a storehouse for storing goods and food, and a multi-purpose space for leisure. It relates to a medium erection method and a bottomed buried pipe.

Applicant can install temporary evacuation shelter for people and goods, shelter for storage of goods and food, leisure and other multi-purpose space in the event of natural disasters such as earthquakes, tsunamis and typhoons or man-made disasters in a relatively short period of time and at a low cost. Patent Document 1 proposes a large-sized bottomed tubular body that can be constructed easily, occupies a small planar space, and is less affected by ground structures and equipment.

Japanese Patent No. 6585787

In Patent Document 1, after a large pipe is pressed into the ground, underwater concrete is supplied from the upper end opening of the pipe and poured into a recess below the lower end of the large pipe to form a concrete base outside the lower end of the pipe. After that, the pipe is lowered to place a bottom cover with a filling hole at the lower end of the pipe, and mortar is injected into the gap between the bottom surface of the bottom cover and the concrete base outside the pipe through the filling hole to form the bottom. The bottom of the tube is constructed by integrating the lid and the concrete base outside the tube.

In this method, when a large pipe is erected underground, it is possible to weld the end of the bottom cover to the inner wall of the pipe while suppressing the ingress of water into the pipe at the lower end of the pipe after the pipe is pressed into the ground. can. However, after the tubular body is pressed into the ground, concrete is supplied, once the concrete is put into the concave portion below the lower end of the large tubular body, and then mortar is injected from the filling hole of the bottom cover arranged on the lower end side of the tubular body. Since the mortar is injected into the gap between the lower surface of the bottom lid and the concrete base outside the pipe, the work must be done without checking the condition of the concrete base on the lower surface of the bottom lid. In addition, the mortar injection work from the filling hole of the bottom cover is work in a narrow space in a limited space, and work setup and injection work take time and work costs. In addition, since filling of the gap between the lower surface of the bottom lid and the concrete base outside the pipe cannot be confirmed after pouring, there is a problem in that the mortar is poured more than necessary, resulting in unnecessary costs for the entire work and materials. On the other hand, the applicant proposes a process of press-fitting the pipe body vertically into the ground while discharging the soil inside the pipe body with ribs attached to the inner wall of the pipe, and A process of pouring ready-mixed concrete up to a height corresponding to the rib part inside the main body, a process of suspending the bottom cover inside the pipe body after the ready-mixed concrete has hardened and placing it on top of the hardened concrete, and a process of placing the outer edge of the bottom cover and the pipe Japanese Patent Application No. 2020-192207 proposes a method for erecting a large-sized bottomed tubular body including a step of welding the inner wall surface of the main body to join the pipe main body and the bottom cover.

This method has the advantage that the filling work can be performed while visually checking the state of the concrete to be poured up to the rib portion in the pipe body, so that the working state and the completion of the work can be confirmed reliably. On the other hand, in this method, after the main body of the pipe is pressed into the pipe to a depth of ten and several meters underground, ready-mixed concrete is poured into the pipe and filled to the required height at the lower end of the pipe. Assistance work inside the pipe by workers is required. In addition, it takes a long time to work, and since it is one of the cast-in-place concrete construction methods, it is difficult to reliably check for water leakage. Furthermore, there is a problem that the work cost increases significantly.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and one of the objects thereof is to achieve smooth and reliable burying work of buried pipes by a combination of simple processes and to prevent water leakage after construction. To provide an underground installation method for a large-sized pipe and a bottomed buried pipe which can surely prevent such accidents. Another object of the present invention is to provide a method for burying a large pipe underground and a bottomed buried pipe, which can complete the work of burying a buried pipe in a short period of time and at low cost.

In order to solve the above problems, the present invention is a method for erecting a large-sized buried pipe that is vertically buried in the ground so that the pipe inner space can be used for various purposes. 20, a step of press-fitting and excavating the preceding excavation pipe 20 into the ground prior to burying the buried pipe 1 so that the pipe wall position includes the burial outer diameter of the buried pipe 1 in plan view; a step of discharging the excavated soil in the pipe at the same time as the excavation of 20; and the buried pipe 1 are arranged in a double-pipe shape, and after the buried pipe 1 is inserted to a predetermined depth position, the preceding excavation pipe 20 is pulled out. be.

At that time, the inner bottom of the bottomed buried pipe 1, which is inserted and lowered into the pipe inner space 100 of the preceding drilling pipe 20 after the preceding drilling pipe 20 is press-fitted to the planned depth, has an anti-buoyancy weight 3 against the buoyancy from the underground side. should be provided.

In addition, a swivel inserter 4 is provided on the outside of the bottom of the bottomed buried pipe 1, and the bottomed buried pipe 1 is buried after the preceding excavation pipe 20 of the bottomed buried pipe 1 is inserted and lowered into the pipe inner space 100. It is more preferable to include a step of turning the tube 1 itself about its longitudinal axis.

In addition, the present invention is a bottomed buried pipe 1 which is inserted and lowered into the pipe inner space 100 of the preceding excavation pipe 20 after the preceding excavation pipe 20 has been press-fitted to the planned depth, and which has a swirling pit with its tip end facing downward to the outside of the bottom. It is composed of a bottomed buried pipe provided with an inserter 4 .

In this case, it is preferable to provide an anti-buoyancy weight section 3 against the buoyancy from the underground side on the inner bottom.

According to the method of erecting a large bottomed pipe body and the bottomed buried pipe of the present invention, the work process can be greatly simplified by improving the pipe body, and each work itself is simple and clear, and the work time can be greatly shortened. Furthermore, it is possible to greatly reduce the work cost.

FIG. 2 is an explanatory plan view showing the positional relationship between a pre-excavated pipe and a buried pipe according to an embodiment of the method for erecting a large pipe underground and the buried pipe with a bottom according to the present invention. It is front explanatory drawing which shows the state which makes the advance drilling pipe|tube concerning embodiment of this invention press-fit into the ground using a tubing apparatus. 3 is a perspective illustration of a tubing apparatus for performing the underground press fit of the pre-drilled pipe of FIG. 2; (a) is an explanatory view showing a state in which a bottomed buried pipe is inserted and lowered into a preceding excavation pipe that has been discharged. (b) is a partially omitted front explanatory view of a bottomed buried pipe. (a) is an explanatory view showing a state in which a buried pipe is arranged in a double-pipe shape inside a pipe of a preceding excavation pipe. (b) is an explanatory diagram showing a double-pipe-like gap set between the preceding excavation pipe and the buried pipe. FIG. 10 is an explanatory view showing a state in which the outer preceding drilling pipe is pulled up to the ground after the buried pipe is arranged in the pipe of the preceding drilling pipe in a double pipe shape. FIG. 4 is an explanatory diagram showing a state in which cement milk is poured around the buried pipe after the preceding excavation pipe is pulled up to form a solidified portion.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a large pipe underground installation method and a bottomed buried pipe according to the present invention will be described below with reference to the accompanying drawings.

A large-sized buried pipe with a bottom used in the underground installation method for a large-sized pipe according to the present invention is buried and erected in order to use the space inside the pipe for various purposes. For example, it is used as an evacuation shelter from earthquakes and other natural disasters, wars and other man-made disasters, and the like. It can also be used as a storehouse for documents, jewelry, magnetic tapes, films and other electronic recording media. In addition, it is used as a space-utilizing tubular body for storage of chemicals, drugs, water, other liquids, other valuable materials, and other arbitrary uses. A large-sized buried pipe with a bottom according to the present invention is a hollow bottomed tubular body having a space inside and a closed bottom. The tubular body is, for example, a tubular body having a diameter of about 2 m to 5 m and a depth of 5 m to 20 m or more, which is buried in the ground, and is made of volcanic ash or clay. It can be effectively used not only in the ground of the soil, but also in areas where the ground contains a lot of water and boulders. The underground installation method for large pipes of the present invention can be effectively utilized in these areas.

Since the structure of the members of the large-sized bottomed tubular body of the present invention differs depending on the erection process, the large-sized bottomed tubular body will be described together with each process.

[First step]
1 to 7 illustrate an embodiment of the method for erecting large pipes underground according to the present invention. FIG. 1 is an explanatory plan view showing the press-fit positional relationship between a preceding excavation pipe 20 that is press-fit into the ground in a substantially vertical direction and an underground pipe 1. The outer solid line indicates the preceding excavation pipe 20 . In this method, the preceding excavation pipe 20 is forced into the ground G where the erection position is set, and the soil is discharged, and the buried pipe 1 to be finally erected is inserted and lowered into the space 100 inside the preceding excavation pipe 20, After that, the preceding excavation pipe 20 is pulled up to the ground to erect the large pipe.

As shown in FIGS. 2, 4 and 5, the pre-drilling pipe 20 is a steel pipe called a so-called casing tube, which is a cylindrical steel pipe with both ends (upper and lower in the drawings) opened. If a single steel pipe can reach the desired underground depth, it is composed of one steel pipe, but it is common to use a plurality of steel pipes connected together. Normally, a unit pipe having a diameter of several meters and an axial length of several meters is gripped by a tubing device and pressed into the ground while being rotated in a direction around the axis. In a state in which one unit pipe is not completely press-fitted and lowered in the tubing apparatus, pipe ends of other unit pipes are connected to each other by welding or an arbitrary fastening means in a water-tight state inside and outside the pipe, and are successively press-fitted and lowered. For example, by using a coupling member, the pipe ends of unit pipes that face each other vertically are screwed together, and a plurality of pipe bodies are connected to form an integrated pre-excavation pipe having a length of, for example, about 20 m, and are press-fitted and lowered. may In this embodiment, as shown in FIG. 4(b), the inside and outside of the pipe are welded and connected in advance on the ground at the welded portion 10 in order to maintain watertightness. The leading drilling pipe 20 has a plurality of drilling bits 21 attached to its lower end, and digs downward while rotating or turning drilling as the tubing device 40 rotates about its axis. As a result, even in the ground where there are many boulders, it is possible to reliably excavate downward while crushing the bedrock or the like with the excavation bit 21 . The excavation bit portion 21 is constructed by fixing a plurality of excavation bits 21a in an annular manner to the lower end edge of the pipe body at intervals. As will be described later, in order to press-fit the pipe body 1 into the ground, the pipe body 1 is pressed into the ground while being rotated in the direction around the longitudinal axis of the pipe body by a dedicated machine. Even if there is a hard bedrock layer or the like during the press-in, it is possible to cut it down while rotating the pipe body and enter the ground.

In FIGS. 2 and 3, a tubing device 40 is installed on the ground, and the preceding drilling pipe 20, which has its axis center vertically arranged in the center of this tubing device 40, is gripped with a chuck, and the preceding drilling pipe 20 is rotated. push it into the ground. In FIG. 2, the tubing apparatus 40 includes a rotating body (not shown) for rotating a tube supported by a body frame 41, an elevating frame that rotatably supports the rotating body, an elevating device, a chuck member, a chuck cylinder, and the like. A rotating tubing device. A receiving plate 42 is placed in advance on the ground on the lower surface of the tubing device 40 . Further, counterweights 43 are arranged so as to sandwich the tubing device 40 from both sides. The counterweight 43 stabilizes the entire tubing apparatus 40 against backlash movement during press-in operations of large tubes.

The first step in the method of burying a large pipe in the ground according to the present invention is to excavate a pre-excavated pipe having a diameter larger than that of the pipe to be buried. Prior to burying the buried pipe 1, the pre-excavated pipe 20 is press-fitted and excavated into the ground. That is, for example, in FIG. 1, the rotation center of the tubing device 40 is set at the center position Q corresponding to the ground plane position of the pipe 1 to be finally buried and erected, and the diameter of the pipe 1 to be buried is larger than that of the pipe 1 to be buried. , the center position of the preceding excavation pipe 20 is set, and the preceding excavation pipe 20 is press-fitted and buried. The preceding excavation pipe 20 and the buried main pipe 1 do not necessarily have to be set at concentric positions. After the pre-excavation pipe 20 is press-fitted and excavated, it is sufficient if there is enough space to insert the pipe 1 for main burial into the pipe 20 . In the embodiment, in order to facilitate understanding, the buried main pipe 1 and the preceding drilling pipe 20, which are inserted downwardly into the preceding drilling pipe, are separated from each other by a required distance D (Fig. 5(b) )) are formed and press-fitted like circles with different diameters at concentric positions so as not to come into contact with the preceding drilling pipe 20 . As a result, prior to burying the buried pipe 1, the pressure-insertion position of the preceding excavated pipe 20 is the position of the pipe wall of the preceding excavated pipe that includes the burial outer diameter of the buried pipe 1 in plan view, as shown in FIG. The pre-drilling pipe 20 is press-fitted into the ground.

Prior to the construction of the buried main pipe 1, the pre-excavation pipe 20 is excavated prior to excavation to form an underground space for inserting and arranging the buried pipe 1. form 100; Then, it functions as a collapse prevention pipe so that the peripheral wall of the vertical hole formed when inserting and arranging the buried main pipe in the space inside the pipe after excavation does not collapse.

[Second step]
Simultaneously with rotary press-in excavation of the preceding excavation pipe 20 by the tubing device 40, excavated soil is discharged into the pipe by excavation through the excavation bit 21 at the lower end of the preceding excavation pipe. That is, in FIG. 30 , when the preceding excavation pipe 20 is rotated and pressed into the ground by the tubing device 40 , the soil inside the preceding excavation pipe 20 is discharged to the ground side by the excavator 44 at the same time. In the embodiment, the excavator is suspended by a heavy machine such as a crawler crane, and a well-known large-diameter excavating machine such as a grab hammer that strikes the ground by a falling force and grabs the earth and sand is used. When excavating the preceding excavation pipe, as the depth is gradually increased, water often seeps into the pipe from the ground at the lower end of the pipe body. The seepage of water can be several meters deep or tens of meters deep.

[Third step]
In FIG. 4, after the preceding excavation pipe 20 is press-fitted to the planned depth while discharging the inside of the pipe by the excavator 44, the bottomed buried pipe 1 as the buried main pipe is inserted and lowered into the pipe interior space of the preceding excavation pipe 20. The pre-excavation pipe and the buried pipe are arranged in a double pipe shape (see Fig. 5). In FIG. 4(b), the bottomed buried pipe 1 placed inside the preceding drilling pipe 20 is a steel pipe called a casing tube, which is made of a steel cylindrical pipe with one end open on the upper end side. be. Constructed by connecting multiple steel pipes.

The bottomed buried pipe 1 has a bottom wall 2 attached in advance by manufacturing on the ground side so that the lower end keeps the watertight state and closes the inside and outside. Furthermore, an anti-buoyancy weight 3 is provided inside the buried pipe 1 and above the bottom wall 2 , that is, at the inner bottom of the buried pipe 1 with a bottom. The anti-buoyancy weight part 3 prevents seepage water from the underground side of the lower end of the pipe when the bottomed buried pipe 1 is inserted and lowered into the pipe interior space of the preceding excavation pipe after press-fit excavation of the preceding excavation pipe to the planned depth. The bottomed buried pipe 1 is prevented from floating against the buoyancy of the The anti-buoyancy weight section 3 may be any tangible material having gravity that can resist buoyancy, such as steel, concrete, or waste materials thereof. The upper surfaces of these anti-buoyancy weights 3 are provided with arbitrary flooring according to the form of utilization of the pipe interior space.

Further, in the present embodiment, a swivel bite device 4 is provided on the outside of the bottom wall 1 of the bottomed buried pipe 1 with its tip facing downward. After the bottomed buried pipe 1 is inserted and lowered into the pipe inner space of the preceding excavation pipe 20 and landed on the bottom, the swivel bite device 4 rotates the bottomed buried pipe 1 itself around the vertical axis to excavate the ground outside the bottom wall 2 . In this embodiment, as shown in FIGS. 4 to 7, a screw shaft 5 and a spiral blade 6 It consists of a screw blade 7 to which is attached. As long as it is a mechanism that bites into the ground by turning the main body side, a device with an arbitrary structure can be adopted as the turning biter 4 . Moreover, it is good also as a downward long screw blade according to the ground condition of a design depth part. In the embodiment, the upper part of the preceding excavation pipe arranged in a double pipe state and the bottomed buried pipe 1 inserted inside are connected, and the two pipes are turned as one by a tubing device to form the bottomed buried pipe 1. It is designed to secure the state of digging into the ground.

When inserting and lowering the bottomed buried pipe 1 to the inside of the preceding excavation pipe 20 at a concentric position, a unit pipe having a required axial length may be grasped by the tubing device 40 and lowered as it is. It may be inserted and lowered while being supported by a suspension device such as a heavy equipment crane. At this time, the bottomed buried pipe 1 is smoothly and quickly inserted into the preceding excavation pipe 20 while maintaining the gap D between the two pipes.

[Fourth step]
After inserting the buried pipe 1 to a predetermined depth position, the preceding excavation pipe 20 is pulled up. Regarding the work of pulling up the preceding excavation pipe 20 to the ground side, it is also possible to pull it up into the ground while holding it with the tubing device 40 and rotating it in the opposite direction around its axis. In this case, there is no need to change the setup of major equipment, from press-fitting excavation of the preceding excavation pipe 20 , inserting and arranging the buried pipe 1 inside the pipe 20 , and pulling up the preceding excavation pipe 20 . Therefore, the number of man-hours required for the work can be greatly reduced, and the work time can be shortened, the work labor can be reduced, and the work cost can be greatly reduced. It should be noted that the preceding excavation pipe 20 may be pulled up using a heavy machine having a lifting function such as a crane.

In the embodiment, a solidified portion 12 is formed by injecting a fluidized solidifying material such as grout into a gap formed at the trailing edge of the preceding excavation pipe 20, which is integrated with the ground. Note that the formation of the solidified portion 12 may not necessarily be performed depending on the size of the gap between the two pipes and the condition of the ground.

As described above, a storage space for the bottomed buried pipe 1 is formed inside the preceding excavation pipe 20 in the ground, and the bottomed buried pipe 1 is inserted and lowered into the storage space while the peripheral wall is earth-retained, Since it is fixed to the ground side, installation, construction, construction, interior arrangement of various facilities in the bottomed buried pipe 1, and other facilities for utilizing the space inside the pipe can be performed on the ground. In addition, since the entire work and confirmation for stopping water from the bottomed buried pipe 1 can be performed on the ground side, it is possible to take all possible measures against water intrusion into the buried pipe 1. - 特許庁For example, power-equipped elevating racks, construction of ventilation equipment, facilities, fixtures, food, storage facilities for goods, etc., shelters for disaster evacuation, and other arbitrary usage forms are designed on the ground side and specifically installed in the pipe. The buried pipe can be used by inserting and descending in this state.

By carrying out the underground installation of the large-sized pipe in the above-mentioned first to fourth steps, the assembly equipment construction according to the purpose of use in the bottomed buried pipe 1 is performed in advance on the ground side, so that the accuracy of the equipment is high. In addition to being able to maintain the completed state, the work process is simple and the number of processes is small, which contributes to shortening the work time, shortening the construction period, and greatly reducing the work cost. In particular, on the ground side, it is possible to take all possible measures to prevent the intrusion of groundwater from the bottom of the pipe so that the pipe can be used stably and safely.

In addition, an anti-buoyancy weight section against buoyancy from the underground side is provided on the inner bottom of the bottomed buried pipe that is inserted and lowered into the internal space of the preceding drilling pipe after the preceding drilling pipe has been press-fitted to the planned depth. As a result, when the bottomed buried pipe 1 is inserted and lowered into the pipe inner space of the preceding excavation pipe, the buried main pipe 1 does not become unstable due to the buoyancy of the seepage water from the underground side of the lower end of the pipe, and the buried main pipe 1 remains stable. It can be placed in the intra-pipe space of the preceding drill pipe.

In addition, on the outside of the bottom of the bottomed buried pipe, a swivel inserter is provided with the tip side facing downward, and after the preceding excavation pipe of the bottomed buried pipe is inserted and lowered into the pipe interior space, the bottomed buried pipe itself is vertically rotated. By including the step of turning around, after reaching the bottom in the pipe inner space of the preceding excavation pipe 20, by turning around the vertical axis of the bottomed buried pipe 1 itself, it reaches the ground outside the bottom wall 22 via the turning bite. It is possible to make the bottom of the bottomed buried pipe 1 bite into the ground G and integrate it.

Further, the bottomed buried pipe of the present invention is a bottomed buried pipe used in the above-described method for burying a large pipe underground. It is a bottomed burial pipe that is inserted and lowered into a space, and the inner bottom is provided with a buoyancy counterweight against the buoyancy from the underground side. When the pipe 1 is inserted and lowered, the buried main pipe 1 can be stably arranged in the pipe inner space of the preceding excavation pipe without becoming unstable due to the buoyancy of the seepage water from the underground side of the lower end of the pipe.

In addition, since the above-mentioned bottomed buried pipe is provided with a swivel bite device facing downward on the outside of the bottom, the bottomed buried pipe 1 It is possible to integrate the bottomed buried pipe 1 with the ground G by making the bottom part of the bottomed buried pipe 1 bite into the ground outside the bottom wall 2 via the swivel bite device by rotating around its own vertical axis.

The method for erecting a large pipe underground and the buried pipe with a bottom according to the present invention described above are not limited to the configurations of the above-described embodiments only, and are within the scope of the invention described in the claims. , other embodiments may be used.

The method for erecting large pipes underground and the bottomed buried pipe of the present invention can be used as a shelter in the event of an earthquake, tsunami, landslide disaster, wartime danger, etc., and can also be used for the storage of various goods, storage warehouses, etc. can do. It is also possible to create a mushroom cultivation space where the growing conditions for light and air are not so strict.

1 Bottomed buried pipe (buried main pipe)
2 Bottom wall 3 Anti-buoyancy weight 4 Swivel bite device 5 Screw shaft 6 Spiral blade 7 Screw blade 20 Preceding drilling pipe 21 Drilling bit part 21a Drilling bit 40 Tubing device 44 Excavator D Gap between both pipes G Ground

Claims (5)

A method for burying a large-sized buried pipe vertically in the ground so that the space inside the pipe can be used for various purposes,
The pre-excavation pipe is larger in diameter than the pipe to be buried, and is press-fitted and excavated into the ground prior to burying the buried pipe so that the pipe wall position includes the burial outer diameter of the buried pipe in plan view. process and
A step of discharging the excavated soil in the pipe at the same time as excavating the preceding excavation pipe;
a step of inserting and lowering a buried buried pipe with a bottom into the internal space of the excavated pipe after press-fitting the preceding excavated pipe to the planned depth, and arranging the preceding excavated pipe and the buried pipe in a double pipe shape;
and extracting the preceding excavated pipe after inserting the buried pipe to a predetermined depth position. The inner bottom of the bottomed buried pipe, which is inserted and lowered into the internal space of the preceding drilling pipe after the preceding drilling pipe has been pushed in to the planned depth, is provided with an anti-buoyancy weight against the buoyancy from the underground side. 2. The method of erecting a large pipe underground according to claim 1. A swivel inserter is provided on the outside of the bottom of the bottomed buried pipe with the tip side facing downward, and after the bottomed buried pipe is inserted and lowered into the pipe space of the preceding excavation pipe, the bottomed buried pipe itself is rotated around the vertical axis. 3. The underground erection method for a large pipe according to claim 1 or 2, further comprising a turning step. A bottomed buried pipe that is inserted and lowered into the pipe inner space of the preceding excavation pipe after the preceding excavation pipe of claim 2 is press-fitted to a planned depth,
A bottomed buried pipe, characterized in that an anti-buoyancy weight is provided on the inner bottom to resist buoyancy from the underground side. 5. A buried buried pipe with a bottom according to claim 4, wherein a swirl chewing device is provided outside the bottom with its leading end facing downward.

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