JP2001098506A - Method for temporarily burying drilled hole for buried pipe by using bag body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for temporarily burying a drilled hole for a buried pipe supporting a road surface accurately and improving the workability. SOLUTION: In a temporary burying method for temporarily back-filling a drilled hole 2 in the buried pipe laying work, a protective material 3a is provided on a pipe end 3, then a plurality of lower temporary buried bodies 5 are installed in the surrounding drilled hole 2. Bag bodies 6 expanded or shrunk by air pressure are inserted in a shrunk state between the lower temporary buried bodies 5, and the prescribed compressed air is fed to the bag bodies 6 to expand them, thus a lower layer temporary buried body 4 holding the lower section of the drilled hole 2 is installed. A horizontal partition plate 7 is horizontally provided on the lower temporary buried bodies 5, granular temporary fillers are filled and compacted on the partition plate 7 to form an upper temporary buried layer 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention temporarily fills an excavation hole at the end of a pipe in the case of excavation pipe work for laying a pipe body underground, where the work is temporarily suspended and then resumed. The present invention relates to a method for temporarily filling a pit for a buried pipe.

[0002]

2. Description of the Related Art In excavation and plumbing work for laying pipes such as gas pipes and water pipes under roads, it is obligatory that backfilling is performed so that traffic is not hindered while the work is interrupted at night or the like. The drilling hole in the general pipe section is backfilled with sand and crushed stone because it is not necessary to drill again, but the end of the buried pipe needs to be drilled again to extend the pipe. Conventionally, the excavation hole at the end of this buried pipe was also backfilled with sand, crushed stone, etc. as in the case of general boreholes. It required labor and time. Therefore, there have been proposed some temporary filling methods that can easily refill the excavation hole at the end of the buried pipe that requires re-excavation and can easily perform re-excavation.

[0003] For example, the temporary filling method disclosed in JP-A-8-193304 and JP-A-10-183588 is a temporary filling method using a lightweight foamed resin (EPS) as a backfill material.

Japanese Patent Application Laid-Open No. 8-193304 discloses a block 25 made of an independent foamed resin divided into one or a plurality around the end of a buried pipe 1 in an excavation hole in a buried pipe construction as shown in FIG. The lower temporary embedding body 24 is loaded, a plurality of sand bags 11a are mounted on the lower temporary embedding body 24 as the intermediate temporary embedding body 11, and the net 13 is laid on the middle temporary embedding body 11 and This is a method for temporarily burying an excavation hole for a buried pipe, characterized by laminating a sheet 14 having water permeability and flexibility thereon, and filling the sheet with earth and sand 15 as an upper temporary filling layer 12.

Japanese Unexamined Patent Publication No. 10-183588 discloses a mountain retaining member using a sheet pile on an inner surface of a burial hole 2 formed by excavating a road surface to bury a buried pipe 1 as shown in FIG. 16, one or a plurality of filling blocks 25 made of a foamed resin are arranged around the buried pipe 1 inside the burying hole, and the partition plate 7 is placed on the upper end of the retaining member 16 above the filling block 25. This is a method for temporarily filling an excavation hole, which is characterized in that the excavation hole is horizontally laid, crushed stones 28 are spread on the upper surface of the partition plate 7, and a pavement 29 similar to a road surface is formed with the crushed stones 28 interposed therebetween.

[0006]

These prior arts have the advantage of being easy to work because they can be temporarily buried using a lightweight block. The use amount of the block or the filling block 25 made of the foamed resin increases, and there is a problem that a large space must be secured for storing and storing the block collected on the ground.

An object of the present invention is to further improve the above-mentioned prior art, and to accurately support a road surface, do not require a large storage space for materials to be used, and improve the workability of a buried pipe excavation hole. To provide a temporary filling method.

[0008]

The gist of the present invention is as follows. In the temporary filling method for temporarily burying an excavated hole in a buried pipe laying work, a protective material 3a is provided at a pipe end 3, and then a plurality of lower temporary embedded bodies 5 are installed in a surrounding excavated hole 2 and the lower temporary embedded body 5 is provided. A bag body 6 that expands and contracts by air pressure between the temporary embedded bodies 5
Is inserted in a contracted state, a predetermined compressed air is supplied to the bag body 6 to inflate the bag body 6, and the lower temporary filling body 4 is installed while holding the lower part in the cut hole 2 and then the lower temporary filling body 5 A hole for a buried pipe using a bag, characterized in that a horizontal partition plate 7 is laid on the upper side, and a granular temporary filling material is filled and rolled on the partition plate 7 to form an upper temporary burying layer 8. Is a temporary filling method.

The internal pressure p of the compressed air supplied to the bag 6 is set at a lower limit in consideration of the earth pressure acting on the wall of the excavation hole and the buoyancy of the bag 6 due to groundwater. It is preferable that the pressure be within the allowable pressure resistance of the bag 6.

A bag 6 inserted between the lower temporary fillings 5
It is preferable that a gap exists between the horizontal partition plate 7 and the lower temporary embedded body 5 in a state where the compressed air is supplied and expanded.

[0011]

The point of the present invention resides in that a lower temporary filling 5 and a bag 6 which expands and contracts by air pressure are used as the lower temporary filling 4. That is, mechanically, the lower part of the pipe end excavation hole 2 is formed by the lower temporary filling body 5 and the bag body 6 which is set to a predetermined internal pressure and inflated to form a lower layer temporary filling body 4 for mounting the hole wall earth pressure and a vehicle or the like. Supports the load to prevent ground subsidence.

Here, the internal pressure p in the bag body 6 does not need to be very high when the ground is hard to collapse or the possibility of groundwater seeping is low. However, the internal pressure p depends on the collapsed ground such as the soft ground or the penetration of rainwater. When there is a possibility that the water level of the groundwater becomes high, it is necessary to set the lower limit pressure to be equal to or higher than the earth pressure acting on the excavation hole wall and to set the bag so as not to float due to the buoyancy due to the groundwater. To prevent the floating body 6 from floating, the bag body 6 and the lower temporary embedded body 5
Alternatively, it depends on the frictional force with the hole wall 2a (operating pressure from the bag body × friction coefficient). Note that the upper limit pressure of the bag body pressure p is within the allowable withstand pressure in consideration of the safety factor in the breaking pressure of the bag body.

The use of the bag body 6 as the lower-layer temporary filling body 4 is extremely advantageous in terms of workability of handling materials. That is, the bag body 6 is contracted and folded during storage to be compact, can be stored in a narrow space, and is easy to handle.

When inserting between the lower temporary fillings 5 installed in the excavation hole 2, the bag 6 is contracted so that the insertion and placement work can be easily performed. Removal and recovery of 6 and lower temporary embedded body 5 are facilitated.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a method for temporarily filling an opening for a buried pipe using a bag according to the present invention will be described.
FIG. 1 is a plan view of a state in which an open hole 2 (usually called a meeting place) at the end of a buried pipe is temporarily buried according to the present invention. 10
Is backfilled with sediment at a borehole in the general section. Figure 2
4 are AA cross section, BB cross section, and C-
The C section is shown.

The provisional filling method of the present invention is performed according to the following procedure. First, a pipe end 3 in an open hole 2 of a buried pipe 1 piped underground.
Then, a protective material 3a such as a blind plate is provided, and a lower temporary embedding body 5 made of a lightweight material such as an independent foamed resin block is arranged in a predetermined arrangement in a lower portion of the hole 2 at the end of the buried pipe. The lower temporary embedding body 5 supports a vehicle load from the ground surface and an overlying load to which the weight of the upper temporary embedding layer 8 composed of the partition plate and the granular temporary embedding body is added, so that the lower temporary embedding body 5 has a certain strength. It is preferable to use a lightweight material such as a closed foam resin block. Further, a light-weight steel may be assembled and manufactured. The upper end of the lower temporary embedded body 5 block is positioned higher than the upper end of the buried pipe of the pipe end excavation hole 2, and a plurality of horizontal partition plates 7, which will be described later, are used so that they can be supported horizontally. The pipe end 3 projecting into the excavation hole 2 is provided with the lower temporary embedded block 5a arranged vertically so as to be sandwiched therebetween.

Next, the bag 6 in a contracted state is inserted into the space (two locations in this embodiment) between the lower temporary pad 5 and compressed air is sent by a compressor to expand the bag 6, thereby lowering the lower pad 5. 4 is constituted. The bag 6 has a flexibility capable of inflating and contracting and has an airtightness for maintaining the internal pressure, but it is necessary to limit the inflating deformation. Further, the shape of the bag body 6 when it is not expanded and contracted is substantially equal to the space width between the lower temporary embedded bodies 5. FIG.
Is a cubic shape having a double structure of an inner bag 6a having a function of sealing inside air and an outer bag 6b having a function of restraining deformation. Is provided with a supply / exhaust port 6d with a stop valve 6c. FIG. 6 shows the internal pressure p and the deformation amount d of the bag body in a state where the periphery is not restrained.
In the graph showing the relationship, large deformation occurs in a low pressure range, but the deformation saturates at a certain pressure pa or more.

When the bag 6 constructed as described above is used, a pressure almost equal to the internal pressure p is applied as a pressing pressure to the outside (lower temporary buried body or excavation hole wall) in contact with the internal pressure p in a small range of expansion deformation. Can be. As a result, the lower portion in the cutout hole 2 is firmly held in a stable state, and the loosening of the ground can be reliably stopped. The shape shown by the dotted line in FIG. 5 is a state where there is no expansion and contraction, and the solid line shows the shape of the bag body in the inflated state when the internal pressure p is not restrained. Note that the bag body 6 has a pressure resistance enough to withstand the internal pressure p that supports the earth pressure load and the overhead load. The internal pressure p of the compressed air supplied to the bag 6 is set at a lower limit pressure equal to or higher than the earth pressure pg acting on the wall of the excavation hole and in consideration of the buoyancy of the bag due to groundwater. Within. When the rainwater has penetrated or the groundwater level is high, the groundwater exerts a large buoyancy on the bag 6, so that the bag 6 may rise to raise the ground surface. As a countermeasure for this, the lower temporary padding body 5 that abuts on the side surface of the bag body
Alternatively, a pressure pf that generates a frictional force equal to or more than buoyancy on the wall surface of the excavation hole is applied. That is, the lower limit pressure of the internal pressure p of the bag is set to pg or pf, whichever is higher.

When the installation of the lower temporary embedding body 4 is completed, the horizontal partition plate 7 is laid across the upper end of each lower temporary embedding body 5. The horizontal partition plate 7 transmits the vehicle load on the ground surface and the own weight of the upper temporary burying layer 8 to the lower temporary burying body 4, and mainly uses a steel plate.

Next, a granular temporary filling material 8 such as earth and sand or crushed stone is filled onto the horizontal partition plate 7 while being rolled to form an upper temporary filling layer 8. The upper temporary embedding layer 8 distributes the load of the passing vehicle on the road surface without deviation and transmits the same to the lower temporary embedding body 4 through the horizontal partition plate 7, using a granular temporary embedding material such as earth and sand, crushed stone or the like, or A sand bag may be used.

Finally, simple asphalt 9 is applied according to the level of the adjacent ground surface. The bag 6 of the lower temporary filling layer 4
When the upper surface is in contact with the horizontal partition plate 7 and pressure is applied,
When the granular temporary filling material is rolled during the formation of the upper temporary burying layer 8, the cushioning effect acts to rebound and the rolling effect may be lost. As a countermeasure against this, the bag 6 of the lower temporary buried layer 4
A gap is provided between the upper surface of the bag and the horizontal partition plate 7 while a predetermined internal pressure is supplied to the bag.

In resuming the plumbing work, when the temporary filling material is removed and collected in order to recover the drilling hole 2 temporarily filled by the means of the present invention, the surface asphalt 9 is broken.
After the upper temporary filling layer 8 is excavated to remove the granular temporary filling material such as earth and sand, and the horizontal partition plate 7 is removed, the supply / exhaust port 6d of the bag body 6 is removed.
The valve 6c is opened to release the compressed air in the bag 6, and the bag 6
Is contracted, pulled up and collected, and the lower temporary embedded body 5 is pulled up and collected. The lower temporary embedding body 5 can be easily worked because there is no side constraint.

[Embodiment] FIGS. 1 to 4 show an embodiment of the present invention, in which a ground surface is placed in a temporary buried portion of an excavation hole 2 having a width of 1.2 m, a length of 1.2 m and a depth of 1.8 m. 0.75m to 1.8m depth
Are used as the lower temporary padding body 7, seven lower temporary padding bodies 5 made of an independently foamed resin block having a compressive strength of 100 kPa to 300 kPa are provided, and two bag bodies 6 each weighing 20 kg are provided therebetween. The bag body 6 has a double structure having an inner bag 6a made of synthetic resin (or rubber) and an outer bag 6b manufactured by sewing a polyester synthetic resin woven fabric, and has a pressure resistance of 200 kpa. The internal pressure of the bag was set to 50 kpa as the pressure pf for preventing the floating of the bag because the buoyancy F of the bag was greater than the pressure pg due to the earth pressure and the overload of the vehicle or the like. In addition,
In calculating the pressure acting on the bag, the coefficient of friction between the lower temporary filling body 4 on the side of the bag and the excavated ground surface was set to 0.1, and the pressure p in the bag was assumed to act as an external pressure. Note that the seven lower temporary fillings 5 are the pipe ends 3 of the buried pipe 1.
A short lower temporary embedding block 5a arranged above and below
The lower temporary embedding block 5a is connected in series with the upper end of the tube.
A lower temporary implant 5 having substantially the same height as the upper surface level of
Four lower temporary implants 5 are disposed so as to be substantially parallel to each other at intervals so as to be in contact with the opposing hole walls 2a in the tube axis direction.

The horizontal partition plate 7 uses four corrugated steel plates (wave height 40 mm) each having a size of 1.2 m × 0.3 m and a thickness of 5 mm, and is horizontally mounted on the lower temporary embedding body 5. The upper temporary embedding layer 8 was set to a height of 70 cm, and the temporary embedding material was filled with a crushed stone by applying rolling pressure every 30 cm. A simple asphalt 9 having a thickness of 5 cm was applied on the upper temporary filling layer 8 to complete the temporary filling. According to this embodiment, the excavation hole can be firmly held by an easy operation, and temporary filling for completely stopping the loosening of the ground can be achieved.

[0025]

According to the method of temporarily filling an excavation hole for a buried pipe according to the present invention, the bag used for the lower temporary buried body is lightweight and easy to handle, so that no heavy labor is imposed on the worker. In addition, since it becomes compact when exhausting, it does not require a large temporary storage and storage space, and can be easily managed at a construction site. Since the bag body holds the predetermined internal pressure and supports the excavated wall surface at a pressure equal to or higher than the earth pressure, the ground does not loosen and the ground surface does not sink by the time of re-excavation. Further, at the time of re-excavation, the ground and the temporary buried body are separated by exhausting the bag body, so that there is an effect that the removal can be easily performed.

[Brief description of the drawings]

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a plan view of a temporarily buried portion implemented by a method for temporarily burying a buried pipe excavation hole according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view (vertical cross-sectional view of a temporary filling portion) taken along the line AA of FIG.

3 is a sectional view taken along line BB of FIG. 1 (a longitudinal sectional view of a temporary buried portion of a buried pipe portion).

FIG. 4 is a sectional view taken along line CC of FIG.

FIG. 5 is a perspective view (partially cut away) of the bag body.

FIG. 6 is a diagram showing the relationship between the internal pressure of the bag and the amount of deformation.

FIG. 7 is a diagram showing a conventional example.

FIG. 8 is a diagram showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 buried pipe 2 pipe end excavation hole (pipe end drilling hole) 3 pipe end 3a blind plate (protective material) 4 lower layer temporary pad 5 lower temporary pad 5a lower temporary pad 6 pipe 6a inner bag 6b Outer bag 6c Valve 6d Supply / exhaust port 7 Horizontal partition 8 Upper temporary filling layer (granular temporary filling material) 9 Simple asphalt 10 General part excavation hole 11 Middle temporary filling 11a Sand bag 12 Upper temporary filling 13 Net 15 Sediment 16 Mountain retaining member 25 Filling block 28 Crushed stone 29 Pavement

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16L 1/00 (72) Inventor Hiroaki Ueda 2-6-3 Otemachi, Chiyoda-ku, Tokyo Nippon Steel Corporation Inside the company (72) Mitsutaka Yoshida 3-2-4 Nakanoshima, Kita-ku, Osaka-shi, Osaka Inside Nippon Steel Osaka Branch (72) Fumio Nagahiro 3-2-4, Nakanoshima, Kita-ku, Osaka-shi, Osaka F-term in Osaka Branch of Nippon Steel Corporation (reference) 2D047 AC01 2D051 AE04 AG11 DA13 DB06 DB20

Claims (3)

[Claims] In a temporary filling method for temporarily burying an excavated hole in a buried pipe laying work, a protective material is provided at an end of the pipe, and then a plurality of lower temporary embedded bodies are installed in the surrounding excavated hole. Insert a bag that expands and contracts by air pressure between the lower temporary implants in a contracted state, supply predetermined compressed air to the bag and expand the lower temporary implant to hold the lower part in the cut hole. Use the bag body characterized in that it is installed, and then a horizontal partition plate is laid horizontally on the lower temporary filling body, and further, a granular temporary filling material is filled and rolled on the partition plate to form an upper temporary filling layer. Temporary filling method for drilled holes for buried pipes. 2. The compressed air supplied to the bag body has a lower limit pressure set in consideration of the earth pressure acting on the cut hole wall and the buoyancy of the bag body due to groundwater, and the upper limit pressure is set within the allowable pressure resistance of the bag body. 2. The method for temporarily filling a pit for a buried pipe using the bag according to claim 1, wherein 3. An upper end of the bag inserted between the lower temporary implants and a horizontal partition plate laid on the lower temporary implants in a state of being inflated by supplying a predetermined compressed air. 3. The method according to claim 1 or 2, wherein a gap is provided.