JP3151418B2 - How to build a shaft - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a shaft for use in propulsion work for burying water and sewage pipes, cables and the like, and more particularly to a method of constructing a shaft in a ground with a lot of spring water. It is.

[0002]

2. Description of the Related Art The following method is already known as a method of constructing a shaft in a ground with a lot of spring water. That is, after performing ground improvement by injecting a chemical solution into the ground on which the shaft is to be constructed, after assembling the liner plate formed by forming the corrugated plate into a cylindrical shape while digging down the ground,
A method is known in which a chemical solution is injected into a gap between an inner surface of a dug-down ground hole and an outer surface of a liner plate, and concrete is poured into a lower end portion of the liner plate.

[0003]

However, the above-described conventional shaft construction method has the following problems. (A) Since spring water accumulates in the liner plate, it is difficult to cast concrete at the lower end portion of the liner plate, and such concrete poured at the lower end portion of the liner plate is insufficient. Has no strength. (B) In the case of the ground with much spring water, it is difficult to inject the chemical. That is, when a chemical is injected into the ground with a lot of spring water, the chemical may not be solidified and may flow away with the water. (C) It is difficult to inject a chemical solution into a gap between the inner surface of the dug ground and the outer surface of the liner plate.
That is, there is a possibility that the chemical solution may be washed away by the spring water from the inner surface of the hole of the ground which has been dug down, and the injection operation of the chemical solution may have to be repeated. (D) It is not easy to assemble the liner plate downward while digging the ground. The present invention has been made to solve the above-mentioned problems in the conventional shaft construction method.

[0004]

In order to solve the above problems, the present invention provides the following shaft construction method.

(1) A concrete bottom plate is previously provided at the bottom of a liner plate having a corrugated plate formed in a cylindrical shape, and the concrete bottom plate has a passage vertically penetrating the concrete bottom plate, and the passage is opened and closed from the ground. A steel pipe is pressed into the ground where a shaft is to be constructed, and the sediment in the steel pipe is removed,
With the shutoff valve for the passage in the concrete bottom plate open, push the liner plate from above into the steel pipe to the position where a slight gap remains below the concrete bottom plate, and then close the shutoff valve for the passage in the concrete bottom plate of the liner plate. Inject a lubricant (chemical solution) into the gap between the outer surface of the liner plate and the inner surface of the steel pipe, pull out the steel pipe before the lubricant hardens, and draw out the water in the liner plate after the lubricant hardens. A method for constructing a shaft according to claim 1 (claim 1).

(2) In the shut-off valve, an elastic air bag is provided on the inner surface of the passage, an air injection pipe is connected to the elastic air bag, and air is supplied to the elastic air bag via the air injection pipe. It is desirable that the elastic air bag expands to block the passage when injected, and the elastic air bag contracts and opens the passage when air in the elastic air bag is discharged. (Claim 2).

(3) The passage has a cylindrical shape, a cylindrical body is fitted on the inner surface of the passage, the elastic air bag has a cylindrical shape, and both upper and lower edges of the elastic air bag have a cylindrical shape. It may be fixed to both upper and lower edges of the body (claim 3).

(4) A steel pipe having no corrugation is connected to the liner plate, a through hole is formed in a side surface of the steel pipe, and a cover plate is removably fitted in the through hole and the through hole is formed. Is desirably sealed with a waterproof rubber plate (claim 4).

[0009]

[Action]

[Construction method of the shaft according to claim 1] A liner plate having a concrete bottom plate provided with a passage with a shut-off valve at the bottom is prepared in advance on the ground. After the steel pipe is inserted, when the earth and sand in the steel pipe are removed, spring water accumulates in the steel pipe. When the liner plate is pushed into the steel pipe from above with the shutoff valve of the passage in the concrete bottom plate open, the spring water accumulated in the steel pipe flows out above the concrete bottom plate through the passage in the concrete bottom plate. Therefore, even if spring water is accumulated in the steel pipe, the liner plate provided with the concrete bottom plate can be pushed into the steel pipe. Next, lubricant is injected into the gap between the outer surface of the liner plate and the inner surface of the steel pipe with the shutoff valve of the passage in the concrete bottom plate of the liner plate closed, but there is a slight gap below the concrete bottom plate Therefore, the sliding material reaches below the concrete bottom plate. At this time, since the shutoff valve of the passage is closed, the sliding material does not pass above the concrete bottom plate through the shutoff valve of the passage. Further, since the lubricating material is injected into the gap between the outer surface of the liner plate and the inner surface of the steel pipe, the lubricating material does not flow away due to spring water. Since the steel pipe is removed before the lubricating material hardens, the steel pipe is smoothly pulled out. The drawn steel pipe is reused. The water in the liner plate is pumped out after the lubricant hardens. The shaft is completed in this manner, and a layer of hardened sliding material is formed on the outer periphery of the liner plate.

According to a second aspect of the present invention, when air is injected into the elastic bladder, the elastic bladder inflates and closes the passage, thereby blocking the passage. When the air in the elastic bladder is exhaled, the elastic bladder contracts and the passage is opened.

According to a third aspect of the present invention, when air is injected into a cylindrical elastic air bag, the elastic air bag expands in the cylindrical body and closes the center hole, thereby blocking the passage. Is done.

According to a fourth aspect of the present invention, a waterproof rubber plate for sealing a through hole on a side surface of a steel pipe prevents water from flowing into the steel pipe through the through hole. The perforations on the side of the steel pipe are water and sewer pipes,
It becomes a wellhead when propelling cables and the like. Water and sewage pipes,
When propelling a cable or the like, the waterproof rubber plate is broken.

[0013]

Next, embodiments of the present invention will be described with reference to the accompanying drawings. According to the present invention, the shaft is constructed as follows.

(1) Preparation of Liner Plate Having Concrete Bottom Plate Liner plate 3 having concrete bottom plate 1 at the bottom
Is prepared on the ground in advance. The liner plate 3 is formed by forming a corrugated plate into a cylindrical shape. The concrete bottom plate 1 has a passage 5 vertically penetrating the concrete bottom plate 1 and the passage 5 is provided with a shut-off valve 7 that can be opened and closed from the ground.

(2) Press-in of steel pipe The steel pipe 9 is press-fitted into the ground where the shaft is to be constructed. That is, FIG.
The steel pipe 9 is buried vertically in the ground as shown in FIG. The steel pipe 1 is, for example, a cylindrical body having a diameter of 2 meters, but the diameter of the steel pipe 9 is not limited to this, and the steel pipe 9 can have any length.

(3) Removal of sediment The soil in the steel pipe 9 pressed into the ground is excavated and removed by a suitable excavator or the like. That is, a columnar space 11 is formed in the steel pipe 9 as an example (FIG. 1). This space 11
Water (spring) 13 accumulates inside (FIG. 2).

(4) Pushing of the liner plate With the shut-off valve 7 of the passage 5 in the concrete bottom plate 1 opened, the liner plate 3 is moved from above to a position where a slight gap 15 remains in the steel pipe 9 below the concrete bottom plate 1. Push in (Figs. 3 and 4).

(5) Injection of lubricant The shutoff valve 7 of the passage 5 in the concrete bottom plate 1 of the liner plate 3 is closed. With the shut-off valve 7 closed, a lubricant 19 is injected into the gap 17 between the outer surface of the liner plate 3 and the inner surface of the steel pipe 9. As the lubricant 19, a cement-based slow-acting lubricant such as mortar is used as an example. Since it is necessary to pull out the steel pipe described later before the sliding material 19 hardens, the time until the sliding material 19 hardens can be adjusted by adjusting the blending of the sliding material 19 depending on the work. . The lubricating material 19 is set, for example, in about one day to one week.

(6) Pulling out the steel pipe The steel pipe 9 is pulled out before the lubricating material 19 hardens. The lubricating material 19 before hardening makes it easy to pull out the steel pipe 9. By the way,
After the lubricant 19 has hardened, it is extremely difficult to pull out the steel pipe 9. The drawn steel pipe 9 is reused. FIG.
See FIG.

(7) Pumping out water After the lubricating material 19 has hardened, water (spring water) 13 in the liner plate 3 is pumped out. Thus, the shaft is completed. On the outer periphery of the liner plate 3, a layer of a hardened lubricant 19 is formed. See FIG.

In the shut-off valve 7, an elastic air bag 21 is disposed on the inner surface of the passage 5, and an air injection pipe 23 is provided in the elastic air bag 21.
When air was injected into the elastic air bag 21 through the air injection pipe 23, the elastic air bag 21 was inflated to block the passage 5, and the air in the elastic air bag 21 was discharged. At times, it is desirable that the elastic air bag 21 is contracted to open the passage 5.

In the shut-off valve 7 shown in FIGS. 8 and 9, the passage 5 has a cylindrical shape, a cylindrical body 25 such as a steel pipe is fitted on the inner surface of the passage 5, and the elastic air bag 21 is made of rubber. It is formed in a cylindrical shape, and both upper and lower edges 21a, 21b of the elastic air bag 21 are formed.
Are fixed to the upper and lower edges 25a, 25b of the cylindrical body 25, respectively. A non-slip 27 for preventing the upper and lower edges 21a, 21b of the elastic air bag 21 from slipping is formed on the outer periphery of the upper and lower edges 25a, 25b of the cylindrical body 25. Reference numeral 29 denotes a band for pressing the upper and lower edges 21a and 21b of the elastic air bag 21 against the outer periphery of the upper and lower edges 25a and 25b of the cylindrical body 25.

In the case shown in FIG. 10, in order to form a shaft of a shaft, a steel pipe 31 having no corrugation is continuously provided on a liner plate, and a through hole 33 is formed on a side surface of the steel pipe 31, and a through hole 33 is formed. A cover plate 35 such as an iron plate is removably fitted into the hole 33 and the through hole 33 is sealed with a waterproof rubber plate 37. Reference numeral 39 denotes a support plate for supporting the lid plate 35, and reference numeral 41 denotes an annular band made of iron or the like for fixing the water-stopping rubber plate 37.

[0024]

The present invention exhibits the following excellent effects.

(A) A liner plate having a concrete bottom plate provided with a passage with a shutoff valve at the bottom was previously prepared on the ground, and the liner plate was pushed into the steel pipe from above with the shutoff valve opened. There is no need to cast concrete for forming the bottom plate at the lower end of the liner plate immersed in spring water. Therefore, the construction can be performed very easily and quickly, and the concrete bottom plate can have sufficient strength.

(B) Since the lubricating material is injected into the gap between the outer surface of the liner plate and the inner surface of the steel pipe, the lubricating material does not flow away due to spring water.

(C) Since the steel pipe is removed before the lubricating material hardens, the steel pipe is pulled out smoothly.

(D) The drawn steel pipe can be reused. Although the steel pipe used for constructing the shaft is extremely expensive, the present invention is economical because the steel pipe can be pulled out after use and reused. Incidentally, the liner plate is also a "disposable" in the present invention.
However, the liner plate is much cheaper than the steel pipe.

(E) Since the steel pipe is pressed into the ground and the earth and sand in the steel pipe are excavated and removed, the liner plate is disposed in the steel pipe. Therefore, the liner plate can be disposed extremely easily and quickly. be able to.

(F) It is not necessary to improve the ground by injecting a chemical solution in advance into the ground where the shaft is to be constructed.

(G) Although a cylindrical liner plate is used, a wellhead for propelling water and sewer pipes, cables and the like can be formed without any problem.

(H) Since a layer of hardened lubricant is formed on the outer periphery of the liner plate, there is no need to inject a chemical solution over the wellhead.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state in which a steel pipe is pressed into a position where a shaft is to be constructed, and soil and sand in the steel pipe have been removed.

FIG. 2 is a sectional view showing a state in which spring water is accumulated in a space in a steel pipe.

FIG. 3 is a sectional view showing a state where a liner plate is being pushed into a steel pipe.

FIG. 4 is a sectional view showing a state where a liner plate is pushed into a steel pipe.

FIG. 5 is a cross-sectional view showing a state where a lubricant is injected into a gap between an outer surface of the liner plate and an inner surface of the steel pipe.

FIG. 6 is a cross-sectional view showing a state where a steel pipe is pulled out.

FIG. 7 is a cross-sectional view showing a state where water is pumped out.

FIG. 8 is a cross-sectional view showing a state where a shut-off valve is opened.

FIG. 9 is a cross-sectional view showing a state in which a shutoff valve is closed.

FIG. 10 is a sectional view showing a state in which a wellhead is formed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete bottom plate 3 Liner plate 5 Passage 7 Shut-off valve 9 Steel pipe 11 Space 13 Water 15 Gap 17 Gap 19 Lubricant 21 Elastic air bag 21a Upper edge 21b Lower edge 23 Air injection pipe 25 Cylindrical body 25a Upper edge 25b Lower edge 27 Sliding Stop 29 Band 31 Steel pipe 33 Through hole 35 Cover plate 37 Waterproof rubber plate 39 Support plate 41 Ring band

Claims (4)

(57) [Claims] 1. A concrete bottom plate is provided in advance on the bottom of a liner plate having a corrugated plate formed in a cylindrical shape,
The concrete bottom plate has a passage vertically penetrating the concrete bottom plate, and the passage is provided with a shut-off valve that can be opened and closed from the ground. The steel pipe is press-fitted into the ground where a shaft is to be constructed, and the sediment in the steel pipe is With the shutoff valve for the passage in the concrete bottom plate open, the liner plate is pushed into the steel pipe from above to a position where a slight gap remains below the concrete bottom plate, and then the passage for the liner plate in the concrete bottom plate is blocked. Close the valve and inject lubricant into the gap between the outer surface of the liner plate and the inner surface of the steel pipe, pull out the steel pipe before the lubricant hardens, and pump out the water in the liner plate after the lubricant hardens A method for constructing a shaft, characterized in that: 2. The shut-off valve has an elastic air bag disposed on an inner surface of the passage, and an air injection pipe connected to the elastic air bag.
When air is injected into the elastic air bag via an air injection tube, the elastic air bag expands to block the passage, and when the air in the elastic air bag is discharged, the elastic air bag contracts. 2. The method according to claim 1, wherein the passage is opened. 3. The passage has a cylindrical shape, a cylindrical body is fitted on the inner surface of the passage, the elastic air bag has a cylindrical shape, and both upper and lower edges of the elastic air bag are cylindrical bodies. The shaft construction method according to claim 2, wherein the shaft is fixed to both upper and lower edges of the shaft. 4. A steel pipe having no corrugation is connected to the liner plate, a through hole is formed in a side surface of the steel pipe, and a cover plate is removably fitted into the through hole and the through hole is formed. The shaft construction method according to any one of claims 1 to 3, wherein the shaft is sealed with a waterproof rubber plate.