JP2797274B2 - Shaft for propulsion method and its construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a shaft provided at a starting portion and a reaching portion in a propulsion method used for sewerage work and the like, and a method of constructing the shaft.

[0002]

2. Description of the Related Art A vertical shaft used in a conventional propulsion method has a circular or rectangular planar shape.

[0003] Since the planar outer shape of a propulsion machine housed in a shaft is generally elongated, a vertical shaft having a rectangular shape has
The propulsion machine can be accommodated without generating a useless space inside. Further, since the wall surface is flat, it is easy to determine the digging and the propulsion direction, which is advantageous when used as a starting shaft of the propulsion pipe. However, when a vertical shaft is used as the arrival shaft of the propulsion tube when the vertical shaft is used, when the propulsion tube reaches the corner of the shaft,
There is a problem that the working efficiency is reduced due to difficulty in drilling the access opening.

In a shaft having a circular planar shape, the propulsion pipe has a high degree of freedom of arrival because of the circular isotropy. However, in order to accommodate the elongated propulsion machine, it is necessary to set the radius of the shaft to be large, so that unnecessary waste space is generated for accommodating the propulsion machine and for the operation itself. In addition, since the work occupied space width is wider than that of a rectangular shaft, in the worst case on narrow roads and the like, it is necessary to restrict traffic such as blocking traffic.

In a conventional shaft construction method in which a shaft block is pressed into the ground by a press-in device equipped with a hydraulic jack and is built at a required number of steps, it is impossible to press-fit the shaft block due to soil conditions. In such cases, it is necessary to excavate hard ground in advance using a machine such as a high-pressure fluid injection facility or auger prepared separately, but it takes considerable time to prepare and set up these machines, and the overall construction period will be longer There's a problem.

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a propulsion method vertical shaft which can reduce the working space width and is suitable for both a starting shaft and a reaching shaft of a propulsion pipe.
An object of the present invention is to provide a shaft construction method capable of efficiently injecting a shaft wall block according to a soil condition because a high-pressure fluid can be immediately injected as needed.

[0007]

Means for Solving the Problems The shaft for propulsion method of the present invention is constructed by stacking hollow shaft-shaped shaft blocks 1 and 2 in a plane shape in which one side of a rectangle is replaced by an arc into a required number of steps. is there.

[0008] The mechanical equipment used for the propulsion method is accommodated in the hollow bottom of the elongate shaft with a horizontal section composed of a rectangle and an arc without creating a useless space. When this shaft is used as the starting side shaft, three surfaces of the rectangular side wall portion 10 of the lowermost shaft wall block 1 are arbitrarily selected as drilling portions of the opening for starting, and the arc side wall portion 9 is not drilled. . When used as the arrival shaft, the arc-shaped side wall portion 9 of the lowermost shaft wall block 1 is used as a hole for drilling the connection opening of the propulsion pipe, and holes are drilled on three surfaces and corners of the rectangular side wall portion 10. Not done. When used as a vertical shaft at a junction point, the arc side wall portion 9 and the rectangular side wall portion 10 are drilled for reaching and starting, respectively.

In the construction method according to the second aspect of the present invention, the pit wall blocks 1 and 2 having a hollow shape of a hollow kamaboko with one side of a rectangle replaced by an arc are sequentially pressed into the ground and built into a required number of steps. A nozzle unit 3 is provided on the lower surface side of the lowermost shaft wall block 1 in advance, and the pipes 6 and 7 or the shaft wall block 1 provided beforehand inside the walls of the shaft walls 1 and 2 are provided.
The pipe 8 previously provided in the inner space of the nozzle unit 3
Is connected to the internal piping 5. In the case where the press-in resistance of the shaft wall blocks 1 and 2 becomes excessive due to hit against the hard ground or the press-in becomes impossible, the high-pressure fluid supplied from the above-mentioned pipe is changed from the nozzle 4 of the nozzle unit 3 to the soil condition. The ground is softened by timely injection in response thereto, and the press-fitting work of the shaft wall blocks 1 and 2 is continued.

[0010] A starting opening 18 is provided in advance in the rectangular side wall portion 10 of the lowermost shaft wall block 1, and press-fitting is performed with the opening 18 closed so that earth and sand do not flow in. If the blockage of the opening 18 is later released, the propulsion method can be started without delay.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The shaft shaft blocks 1 and 2 are basically made of reinforced concrete. However, the shaft shaft block 1 at the lowermost portion is formed in order to facilitate the work of drilling a starting opening and a reaching opening. The number of reinforcing bars in the lower half of the side wall to be drilled may be reduced or the reinforcing bars may be omitted. When the reinforcing bars are reduced or omitted as described above, it is desirable that the reinforcing iron plate 25 be attached and fixed to the inner surface of the upper half of the side wall of the shaft wall block 1. The high pressure fluid supply pipes 6 and 7 are
When it is provided inside the side wall 2, it is desirable to dispose it at the corner so as not to hinder the drilling of the starting opening and the reaching opening as shown in FIG.

The press-fitting of the shaft shaft blocks 1 and 2 is performed as shown in FIG.
As shown in FIGS. 2 and 33, this is performed by the press-fitting device 13 equipped with four hydraulic jacks 44. A press-fitting device 13 in which the lowermost shaft wall block 1 is installed at a predetermined position on the ground
To excavate earth and sand in the inner space of the shaft wall block 1 to a predetermined depth. The shaft shaft block 2 on the upper stage side is sequentially stacked on the shaft wall block 1 and the press-fitting device 1
3 to excavate earth and sand in the internal space of the shaft wall blocks 1 and 22 integrally. By repeating the press-in and excavation work, a shaft having a required depth is built. However, depending on the soil condition of the ground, high-pressure fluid is injected from the nozzle unit 3 as needed to soften the ground in the press-in progress direction. As the high-pressure fluid, high-pressure water, compressed air, mud slurry, or the like is used.

After all the pit wall blocks 1 and 2 have been successively press-fitted in the vertical direction, the bottom slab 14 is formed by casting concrete, and a step 19 is provided on the inner surface of the pit wall block 2 as necessary. Will be installed. Rectangular side wall part 10
The starting opening of the propulsion method is drilled, and the reaching opening is drilled in the arc side wall portion 9, and concrete crushed by the drilling is carried from the bottom of the shaft.

[0014]

In the embodiment shown in FIGS. 1 to 12, the vertical shaft wall blocks 1 and 2 are cylindrical reinforced concrete members having a planar shape in which a piece of a square is replaced by a semicircle, and arc side wall portions 9 and 11 are shown. And rectangular side wall portions 10 and 12. A joining recess 31 is provided on the upper surface of the shaft wall blocks 1 and 2, and a joining protrusion 31 engaging with the recess 31 is provided on the lower surface. Nozzle unit 3
A pipe 6 communicating with the internal pipe 5 is provided so as to be built in the wall thickness of the vertical shaft wall block 1, and a pipe 7 communicating with the pipe 6 is provided.
Is built in the wall thickness of the shaft wall block 2. The pipes 6, 7 of the rectangular side wall portions 10, 12 are provided at the corners so as not to interfere with the drilling of the starting opening. When it hits the hard ground during the press-fitting, high-pressure water, compressed air or the like is supplied from a pressure-resistant hose connected to the pipe 7 of the shaft shaft block 2 at the top.

The rectangular side wall portion 1 of the shaft wall blocks 1 and 2
A mounting insert 20 of a U-shaped step 19 is buried in 0 and 12, and a lifting hole 21 for lifting the vertical shaft wall blocks 1 and 2 by a crane or the like is provided. In addition, a starting opening 18 of a propulsion pipe is provided in advance on a surface facing the arc side wall portion 9 among three surfaces of the rectangular side wall portion 10 of the lowermost shaft wall block 1. The opening 18
Is filled with a styrofoam plate 26 to prevent earth and sand from entering during the press-fitting operation, and an opening 1 is formed in the outer wall surface.
8 is covered with a thin iron plate 25.
At the start of the propulsion method, the styrofoam plate 26 and the thin iron plate 25 are pierced by a propulsion tube.

The nozzle unit 3 is integrally formed by welding a steel material. The nozzle unit 3 is fitted and mounted on the lower surface side of the lowermost shaft wall block 1.
The nozzle 4 formed over the entire circumference has a right-angled triangular cross section so as to be a press-fitting blade. Nozzle 4
A pipe 5 having a through-hole is inserted at an appropriate position inside the inside of the nozzle 4, and a high-pressure fluid ejection hole 22 is provided at an appropriate interval on an inward slope wall of the nozzle 4. The inlet pipe 23 of the pipe 5 is provided at a position corresponding to the built-in pipe 6 of the shaft wall block 1. The nozzle unit 3 is provided with a bottom plate support 15 made of steel, and a ready-made bottom plate 14 is installed on the bottom plate support 15.

In another embodiment shown in FIGS. 13 to 24, the shaft blocks 1 and 2 do not include the pipes 6 and 7 in the above embodiment. Piping 5 of nozzle unit 3
The pipe 8 connected to the inlet pipe section 23 is exposed to the inner space of the pit wall blocks 1 and 2 as shown in FIG. A pressure-resistant hose from the high-pressure fluid supply device is connected to the pipe 8. In the lower part of the side wall of the lowermost shaft wall block 1, a reinforcing bar 16 for a bottom plate is embedded all around. These rebars 16 are excavated horizontally as shown in FIG. 31 after the press-in and excavation work of the shaft wall block. As shown in FIG. 30, a reinforcing bar 27 and a reinforcing bar 28 are passed over the reinforcing bar 16 in a crossing direction, and concrete is poured into the reinforcing bar 16 so as to wrap the reinforcing bars 16, 27 and 28 to form a bottom plate 14 of a shaft. . The groove formed on the inner wall surface by excavating the reinforcing bar 16 is covered with a single-sided adhesive tape to prevent the concrete from flowing out when the bottom slab is formed. The bottom slab 14 and the shaft wall block 1 are integrally connected via a reinforcing bar 16, and a strong shaft is built.

In this embodiment, a base concrete 29 is cast on the bottom of the shaft wall block 1 before the bottom slab 14 is cast.
After the base concrete 29 has hardened, a propulsion machine is installed to perform a propulsion method. Since the nozzle unit 3 is divided into a plurality of pieces and is made of a casting, it can be mass-produced in a short time and cost can be reduced. Also, since the pieces are stored compactly, the stock space can be effectively used. Since the pieces are joined by bolts 24 and welding distortion and the like do not occur, the shaft shaft block 1
Work can be performed accurately and quickly without causing dimensional mismatch problems. At the upper part of the nozzle unit 3, a supporting step 3 a made of a channel-shaped steel material is provided, and the joining projection 32 of the shaft wall block 1 is engaged. Other configurations are the same as those of the above-described embodiment.

In each of the above embodiments, the upper opening of the shaft shaft block 2 at the top is closed by the reinforced concrete floor slab 30 shown in FIGS. The bottom surface of the floor slab 30 is provided with a joining projection 33 that engages with the joining recess 31 of the shaft wall block 2, and a lifting hole 45 by a crane is provided on the top surface. The circular entrance 34 penetrates in the vertical direction, and a step 19 is provided on the inner wall surface of the entrance 34. A circular step 36 is provided around the upper end of the entrance 34, and when the height adjustment ring 35 is used as shown in FIG. 13, the bottom projection of the height adjustment ring 35 is attached to the step 36. It is fitted. On the upper surface of the height adjustment ring 35, a lid unit 40 is installed.

In the swash wall floor slab 37 shown in FIG. 28, an annular groove 39 is eccentrically provided on the upper surface of the slab with respect to the entrance 34, and when the swash wall block 38 is used as shown in FIG. The lower surface projection of the inclined wall block 38 is fitted into the annular groove 39. At the time of this fitting, a sealing process is performed with an appropriate material. A height adjusting ring 35 or a lid unit 40 is installed on the upper surface of the sloping wall block 38. A similar annular groove 4 is also provided on the floor slab 41 shown in FIG.
2 are provided. In each of the embodiments, FIG.
As shown in FIG. 4, a waterproof packing 43 is inserted between the shaft wall blocks 1 and 2 or the joint surface between the shaft wall blocks 2 and the floor slabs 30, 37 and 41, and groundwater or seepage water from the ground surface is inserted. Prevent intrusion.

[0021]

According to the first aspect of the present invention, the shaft for propulsion method is constructed by stacking the hollow shaft-shaped shaft walls 1 and 2 to a required number of steps, where one side of the rectangle is replaced by an arc, and And a circular shape, the overall shape is elongated, so that no wasteful space is generated when accommodating the elongated propulsion machine, and the shaft wall blocks 1 and 2 are formed.
Since the width of the work space can be made as small as possible, the width of the work space becomes small, and construction in a narrow place is possible without interrupting traffic.

Further, since the rectangular side wall portions 10 and 12 are tangentially connected to the arc side wall portions 9 and 11, the arc side wall portions 9 and 11 or the arc side wall portions 9 and 11 and the rectangular side wall portions 10 and 11 adjacent thereto are formed. If 12 is used as the arrival surface of the propulsion pipe, a wide degree of freedom in the propulsion direction can be ensured, and since the arrival surface has no corners, the workability of drilling the arrival pipe is improved.

According to the construction method of the shaft for the propulsion method of the second aspect, the nozzle unit 3 is provided below the shaft block base block 1.
Since the pipes 6 and 7 connected to the internal pipe 5 of the nozzle unit 3 are provided in each of the inside of the vertical shaft base block 1 and the vertical shaft intermediate block 2 or in the space inside them, the ground 6 When the press-fitting becomes impossible, the high-pressure fluid can be immediately injected from the nozzle 4 of the nozzle unit 3 to soften the ground, and the press-fitting operation can be continued without delay. There is no need to separately prepare high-pressure fluid injection equipment or augers, etc., and perform pre-drilling, and there is no time required for preparation and setup, so construction can be proceeded without interruption and the construction period can be shortened. is there.

According to the third aspect of the present invention, a starting opening 18 is provided in the rectangular side wall portion 10 of the shaft wall base block 1 in advance, and the opening 18 is closed with the opening 18 closed so that earth and sand do not flow. Since the work was performed and the opening 18 was unblocked at the start of the propulsion method, the propulsion method could be started immediately after the erection wall intermediate block 2 was erected, and the construction period could be shortened. This eliminates the need to carry concrete debris generated when drilling the starting opening.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a shaft for a propulsion method according to an embodiment of the present invention.

FIG. 2 is a plan view of the shaft of FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

FIG. 5 is a plan view of a nozzle unit used in the shaft of FIG.

FIG. 6 is a sectional view taken along line CC of FIG. 5;

FIG. 7 is a plan view of a shaft wall block used at the bottom of the shaft of FIG. 1;

FIG. 8 is a right side view of the shaft wall block of FIG. 7;

FIG. 9 is a sectional view taken along line DD of FIG. 7;

10 is a plan view of a shaft wall block used for the second stage or more of the shaft of FIG. 1. FIG.

FIG. 11 is a right side view of the shaft wall block of FIG. 10;

FIG. 12 is a front view of the shaft shaft block of FIG. 10;

FIG. 13 is a longitudinal sectional view of a shaft according to another embodiment of the present invention.

FIG. 14 is a sectional view taken along the line EE of the shaft of FIG.

FIG. 15 is a plan view of a nozzle unit used for the shaft of FIG.

16 is a sectional view taken along line FF of FIG.

FIG. 17 is a plan view of a shaft wall block used at the bottom of the shaft of FIG. 13;

FIG. 18 is a sectional view taken along line GG of FIG. 17;

FIG. 19 is a sectional view taken along line HH of FIG. 17;

20 is a plan view of a shaft wall block used for the second stage or more of the shaft of FIG.

FIG. 21 is a right side view of the shaft wall block of FIG. 20.

FIG. 22 is a front view of the shaft shaft block of FIG. 20.

FIG. 23 is a plan view of a nozzle unit used in the shaft of FIG.

FIG. 24 is a sectional view taken along line II of FIG. 23;

FIG. 25 is a plan view of a floor slab for an adjusting ring used in the shaft.

FIG. 26 is a right side view of the floor slab for the adjustment ring of FIG. 25.

FIG. 27 is a front view of the adjustment ring floor slab of FIG. 25.

FIG. 28 is a plan view of a slab for a ramp wall block used in the shaft.

FIG. 29 is a plan view of another floor slab used for the shaft.

FIG. 30 is a plan view when the bottom plate rebar is dug up in the shaft wall block of FIG. 17;

FIG. 31 is an enlarged longitudinal sectional view of a reinforcing bar portion of FIG. 30.

FIG. 32 is a plan view showing a press-fitting operation of the shaft wall block.

FIG. 33 is a sectional view taken along line JJ of FIG. 32.

FIG. 34 is an enlarged vertical sectional view of a joint of a shaft shaft block.

FIG. 35 is an enlarged longitudinal sectional view of a nozzle portion of the nozzle unit of FIG. 23.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vertical shaft block 2 Vertical shaft block 3 Nozzle unit 4 Nozzle 5 Internal piping of a nozzle 6 Built-in piping of a vertical shaft block 7 Built-in piping of a vertical shaft block 8 Piping in the inner space of a vertical shaft block 9 Arc side wall portion 10 Rectangular side wall portion DESCRIPTION OF SYMBOLS 11 Arc side wall part 12 Rectangular side wall part 13 Press-fitting device 14 Bottom plate of vertical shaft 15 Bottom plate support part of nozzle unit 16 Reinforcing bar for bottom plate 18 Starting opening 19 Step 20 Step mounting insert 21 Lifting hole 22 Spout hole of nozzle unit 23 Opening 24 Nozzle unit joining bolts 25 Reinforcing iron plate 26 Styrofoam plate for closing start-up opening 27 Reinforcing bar for bottom plate 28 Reinforcing bar for bottom plate 29 Base concrete 30 Floor plate for adjusting ring 31 Joining recess 32 Joining protrusion 33 Convex portion 34 Inlet 35 Height adjustment ring 36 steps 37 oblique wall slab 38 inclined wall block 39 groove 40 cover unit 41 bed plate 42 an annular groove 43 waterproofing packing 44 hydraulic jack 45 lifting holes

Claims (3)

(57) [Claims] 1. A shaft for a propulsion method constructed by stacking hollow shaft blocks 1 and 2 in a plane shape having a rectangular shape in which one side of a rectangle is replaced by an arc and having a required number of stages. 2. The lower side of the lowermost shaft wall block 1 when stacking up a required number of stages of hollow shaft blocks 1 and 2 having a rectangular shape in which one side of a rectangle is replaced by an arc and pressing it into the ground. The nozzle unit 3 is provided in advance, and high-pressure fluid is supplied to the internal piping 5 of the nozzle unit 3 from the pipes 6 and 7 provided inside the walls of the shaft blocks 1 and 2 or the pipe 8 provided in the inner space of the shaft blocks 1 and 2. And a method for constructing a shaft for a propulsion method in which high-pressure fluid is injected from the nozzle 4 of the nozzle unit 3 according to the soil condition in a timely manner. 3. A starting opening 18 is provided in advance in the rectangular side wall portion 10 of the shaft wall base block 1, and a press-fitting operation is performed in a state where the opening 18 is closed so as to prevent inflow of earth and sand. The construction method according to claim 2, wherein the blockage of the 18 is released.