JPH0235192A - Discharge method for digged earth and sand in propulsive method - Google Patents

Abstract

PURPOSE:To discharge earth and send accurately and easily as well as to facilitate handling after discharging by producing a flow of air in a suction hose set up in an interval between a pusher pipe tip and a silt tank, placing granular earth and sand on this air flow and transferring it for discharge. CONSTITUTION:A suction hose (x) is set up in a pusher pipe (b), its tip is opened at the tip side of this pusher pipe (b), and the rear end is connected to a blower (e) by way of a silt tank (d), whereby a flow of air is produced in the hose (x). Then, digged earth and sand is set down to a viscous diameter of less than two thirds of an inner diameter of the suction hose (x), placing it on the air flow in the suction hose (x) in leaving it left as a solid form intact, and then it is moved for discharge after being precipitated in the silt tank (d). In this connection, an air intake is opened in the midway of the suction hose (x) via an air intake pipe 8 provided with a valve, and then the air flow in the suction hose (x) is regulated into an optimum condition by operation of this valve.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for discharging excavated earth and sand in a propulsion method. In particular, this invention relates to a method for efficiently and easily discharging excavated earth and sand from a propulsion pipe by carrying the excavated earth and sand in an air flow, allowing the carried earth and sand to settle in a tank.

(Conventional technology) The propulsion method is one of the methods for burying sewer pipes and the like underground. The propulsion method involves first digging a starting shaft, lowering a pre-made steel pipe or humid pipe into the starting shaft, and pressing this pipe almost horizontally into the ground using the propulsion force of a jack, thus burying the pipe underground. It's a method. Prefabricated steel tubes or humid tubes are called propulsion tubes. With the propulsion method, most of the construction work is carried out underground, with only starting shafts or arrival shafts appearing here and there above ground, so there is less obstruction to traffic, and there is generally less construction pollution. It is widely used in the subcommittee for burying sewage pipes, etc.

When burying a propulsion tube with a diameter of several tens of centimeters or more, the ground at the tip of the propulsion tube is excavated in order to propel it, and the excavated earth and sand is discharged from the propulsion tube. It was necessary to do so. For this reason, until now, earth and sand have been transported within the propulsion pipe using trolleys or belt conveyors. In addition, soil was also transported using pipes as slurry. However, transportation by these methods has various drawbacks.

Its disadvantages are as follows. First, in the method of using a trolley, the trolley must be moved by people, but the inside of the propulsion pipe is narrow and visibility is poor, making the work dangerous and difficult.In addition, it takes time and effort to pull up the earth and sand from the shaft. Therefore, the earth and sand could not be discharged efficiently, and the propulsion tube could not be propelled continuously, and as a result, the tube could not be propelled efficiently. Next, with the method of using a belt conveyor, it is expensive to install the belt conveyor, and the belt conveyor occupies a large space within the pipe, making it difficult to move around and work inside the pipe. There were also difficulties in moving the conveyor, and in the end it was not possible to efficiently discharge the earth and sand and proceed with the propulsion work. In addition, in the slurry method, slurry is required to turn the excavated soil into slurry, and it is necessary to supply a large amount of mud, which is more than twice the volume of the cut soil. The slurry had to be drained,
Not only was it not possible to efficiently discharge the earth and sand, but the discharged slurry had to be dehydrated and disposed of, so it was not easy to dispose of.

(Problems to be solved by the invention) This invention improves the drawbacks associated with the conventional method as described above,
This was done in an attempt to provide a method for easily discharging earth and sand excavated in the propulsion method from the propulsion pipe to the side of the starting shaft.

In order to achieve the above-mentioned purpose, the inventor first
proposed a method, and applied for the method in patent application No. 63-12010.
A patent application was filed as No. 8. The key to this method is to place a suction hose inside the propulsion pipe, flow air through the suction hose, carry the excavated earth and sand in solid form on the airflow, and move it to the side of the shaft. To be more specific, this method is a propulsion method in which a propulsion pipe is forced into the ground from a starting shaft using the thrust of a jack, and the pipe is buried underground.A suction hose is installed inside the propulsion pipe, and the suction hose is The tip of the propulsion tube becomes clear and creates a flow of air that flows across the shaft.
The solid earth and sand are excavated along the tip of the propulsion tube to a particle size of two-thirds or less of the inner diameter of the suction hose, and are carried along the air flow flowing through the suction hose and moved to the side of the shaft. This method is characterized by discharging earth and sand from a propulsion tube. The present inventor has discovered that in the method already proposed above, the suction hose simply pumps air through the opening at its tip without making any special modifications to the suction hose. It was described as something that can only be inhaled. However, this inventor has devised a suction hose this time,
It has been found that if an air inlet is provided in the middle of the suction hose in addition to the opening at the tip, the suction of the earth and sand becomes smoother, and the movement of earth and sand by air becomes easier.

(Means for Solving the Problem) The inventor provided an air inlet in the middle of the suction hose, especially near the tip of the suction hose, and the above-mentioned suction force causes air to naturally flow from the inlet into the suction hose. It has been found that by doing so, even if cut earth and sand accumulates around the tip of the suction hose, the suction hose will be able to suck in the earth and sand without becoming clogged. Furthermore, the inventor discovered that when pressurized air is injected through the above-mentioned inlet port, not only the suction of the earth and sand becomes smoother, but also the moving speed of the earth and sand is increased. This invention was completed based on such knowledge.

This invention is a propulsion method in which a propulsion pipe is forced into the ground from a starting shaft by the propulsion force of a jack and the pipe is buried underground. At the same time, an air inlet is provided in the middle of the suction hose, and the rear end of the suction hose is connected to a suction machine via a separated sediment tank, and air is drawn from the opening at the end of the suction hose by suction from the suction machine. Then, air is introduced auxiliary from the above-mentioned inlet, and the soil, which has been excavated around the tip of the propulsion tube and has a particle size of two-thirds or less of the inner diameter of the suction hose, is collected in solid form through the suction hose. This invention relates to a method for discharging excavated soil in a propulsion method, which is characterized by moving the excavated soil on an air flow introduced from the opening at the tip of the excavated soil, and settling and collecting the excavated soil in a soil tank.

(Example) An example of implementing the present invention will be described below based on the drawings. FIG. 1 is a vertical sectional view of the ground schematically showing the method of this invention.

FIG. 2 is a partially cutaway perspective view of the tip end in FIG. 1. FIG. 3 is a partially cutaway perspective view of the equipment provided near the rear end in FIG. 1. FIG. 4 is a model diagram illustrating the operation of the equipment shown in FIG. 8. FIG. 5 is a partially cutaway side view of another suction hose. FIG. 6 is a perspective view of other equipment provided along the rear end of the suction hose.

In FIGS. 1 and 2, a indicates a leading pipe, b indicates a propulsion pipe, and C indicates a starting shaft.

The leading pipe a excavates the ground in front with a canter pit 1 provided at its tip, and the excavated earth and sand 2 is sent rearward by a screw conveyor 3 and deposited in a box 4. Accumulated sediment 2
The particles are sieved by a screen 5, and only small particles are sent to the rear. The propulsion pipe is made of iron, concrete, etc., and is propelled toward the tip by the propulsion force of a jack 6 installed in the starting shaft C. In this way, the propulsion pipes are press-fitted into the ground and are buried one after another underground.

A suction hose X is installed inside the propulsion pipe. The suction hose X may be made of a hard material, but is preferably made of a soft material. A preferred suction hose is, for example, made of flexible synthetic resin and is similar to the suction hoses used in vacuum cleaners. It is preferable that the hose wall is reinforced with a wire rod made of a hard material attached in a spiral manner, and the entire hose is transparent or translucent. For example, a hose sold by Totaku Kogyo Co., Ltd. under the trade name Canadain is suitable. The inner diameter of the suction hose X is suitably 100 to 200 mm. The suction hose X can extend over a length of 400 meters.

The tip 7 of the suction hose X is open to the same size as the hose. Further, an air introduction port is provided in the middle of the suction hose X, that is, near the tip, and an air introduction pipe 8 is attached to the air introduction port. The air introduction pipe 8 has a smaller inner diameter than the suction hose X.

A valve is attached to the air introduction pipe 8 so that the amount of air introduced can be adjusted. The end of the air introduction tube 8 can penetrate the tube wall of the suction hose X and protrude slightly into the tube, but it can also end just on the tube wall. The other end of the air introduction tube 8 is open in the propulsion tube.

When the suction hose X has an inner diameter of 100 to 200 mm, the air introduction pipe 8 has an inner diameter of 2
It is desirable to use a diameter of 5 mm or less. Further, it is desirable that the air introduction pipe 8 be provided at a distance of 200 to 1000 mm from the tip 7 of the suction hose X. It is desirable that the valve provided in the air introduction pipe 8 be able to freely adjust the amount of air passing through it.

The rear end of the suction hose
The earth and sand tank d is connected to the blower e near the middle of the blower e. Therefore, blower-e″′C
'C suction, an air flow is generated in the suction hose
An air flow is generated which flows in the direction of the arrow y.

The lower end of the suction hose X faces into the box 4 and is located at a place where the earth and sand 2 that has passed through the net 5 can be sucked. Net 5
is provided in order to select only small particles of earth and sand that can freely pass through the suction hose.

The small particles have a particle size that is approximately two-thirds or less of the inner diameter of the suction hose X, preferably half or less. Net 5
The earth and sand that has passed through the suction hose are moved toward the earth and sand tank d by riding on the air flow flowing through the suction hose. In this way, the excavated earth and sand are discharged from the propulsion pipe.

If the air introduction tube 8 is left open when air is sucked in from the lower part between the tips, the air will be naturally sucked in from the air introduction tube 8. As long as excavated earth and sand are not excessively accumulated around the tip-to-tip lower, the tip-to-tip lower will continue to suck in the dirt without introducing air from the air introduction pipe 8. Therefore, the valve of the air introduction pipe 8 is kept closed during this time. However, if the dirt builds up on the edge of the lower part between the tips, the suction of the dirt from the lower part between the tips becomes poor, and the dirt may become clogged in the suction pipe.

In such a case, if the valve of the air introduction pipe 8 is opened and air is introduced from the introduction pipe 8, the earth and sand will be smoothly sucked in from the lower part between the tips. Additionally, if a part of the suction hose becomes clogged with dirt, introducing air through the air intake tube will clear the blockage.

A dirt tank and a suction machine are installed next to the rear end of the suction hose X, and an example of their installation is shown in FIG.

In Fig. 3, the rear end of the suction hose
Then, it enters the switching valve f', merges, and is connected to the blower e via the separator g. In the earth and sand tank d, the air flow from the suction hose X enters from the bottom of the tank d, swirls along the side wall of the tank d, and then exits from the top of the tank. Therefore, the earth and sand carried by the air flow are caused to settle and accumulate in the tank d by gravity, and only the air is discharged from the upper part of the tank. However, if the fine earth and sand particles do not accumulate in the tank but are carried by the air flow and are discharged from the top of the tank, a separator g is installed to prevent the fine earth and sand particles from entering the blower e. has been done. separator g
is based on the principle of a cyclone and acts to separate fine particles from the air. The effect is as shown in Figure 4.
In the first separator g1, dust with a slightly larger particle size among the fine particles is first settled and removed by a cyclone, and then in separator g2, FA dust with a smaller particle size is removed by passing an air stream through the water. It is then vacuumed by roots blower 〇, and finally separator g
In step 3, residual dust is further removed, muffled, and released into the air.

The switching valves f and f' are provided for continuous discharge of earth and sand. That is, in order to continuously discharge the earth and sand, two earth and sand tanks d are provided, so when taking out the earth and sand that has accumulated in one tank, the air is stopped from flowing into that tank. In order to allow air to flow to other tanks at the same time so that the earth and sand can continue to be discharged even when taking out earth and sand from the tank, switching valves f and f' are installed.
and is provided.

For example, a Roots blower is used as the blower e.

A Roots blower is a blower with a structure in which a plurality of rotating leaves mesh and rotate to generate airflow.

In this invention, it is desirable to use two Roots blowers connected in series in order to generate a strong air flow. Moreover, among roots blowers, it is preferable to use one having a structure in which three rotary leaves are engaged with each other. In this invention, a large capacity blower is used as blower e,
It is essential to generate a large volume and high velocity air flow within the suction hose χ.

The earth and sand 2 excavated by the leading pipe a exhibits various properties depending on the type of ground. When the excavated soil is a large lump,
After pulverizing this, it is passed through the suction hose X.

Additionally, if the excavated earth and sand is made of highly sticky clay, a small amount of water is added to it to reduce the viscosity of the surface and prevent it from adhering to the inner wall of the suction hose. In this case, the amount of water added should be small and care should be taken not to turn the earth and sand into slurry. This is because the method of this invention is characterized by pneumatically transporting the earth and sand in solid form.

The range that can be transported in solid form is when the amount of water is 30 parts or less per 100 parts of earth and sand.

The suction hose X can be easily extended if necessary, for example by means of a flange connection or a sleeve connection. When the suction hose X is several meters long,
An air cock will be installed in the middle. The air conc is used to introduce air from here when necessary to remove earth and sand adhering to the wall surface of the suction hose X.

Although FIGS. 1 and 2 show a mode in which the air is naturally sucked in from the introduction tube 8 without being pressurized, pressurized air may also be introduced from the introduction tube 8.

In this case, as shown in FIG. 5, it is desirable to direct the tip of the introduction tube 8 located inside the suction hose X in the direction of the arrow y. In this way, the pressurized air blown out from the inlet tube 8 flows in the direction of the suction machine, further promoting the flow of air caused by the suction machine. Therefore, when pressurized air is introduced, not only is the earth and sand smoothly sucked in from the lower end of the suction hose .

When introducing pressurized air, the air pressurizer can be installed in the shaft, but it is more preferable to install it above ground. A degree of pressurization of 5 kg/C or less is sufficient.

When introducing pressurized air through the air inlet, the air inlet may be left open.

However, when introducing air naturally from the air inlet, the air inlet should be open normally, and if the flow of dirt becomes abnormal, such as when it becomes difficult to suck in the sand from the opening at the end of the suction hose. Open the inlet only when necessary. In any case, the amount of air introduced from the air inlet is small compared to the amount of air introduced from the tip opening. In this sense, the introduction of air from the air inlet can be said to be auxiliary.

This invention is characterized in that the excavated earth and sand is transported in a solid state into a suction hose along with an air flow. Therefore, the earth and sand taken out from the suction hose is solid and can be disposed of as residual soil. This is a huge advantage compared to mud, which is treated as mud. In other words, soil that has been turned into slurry cannot be disposed of unless it is first dehydrated, and even if the dehydrated material is disposed of, it is treated as industrial waste, so it cannot be disposed of as ordinary soil. cannot be disposed of as easily. However, the earth and sand taken out in this invention can be disposed of anywhere as is, which is very advantageous.

In Fig. 1, the excavated earth and sand is placed in the -H earth and sand tuck d, and then transferred to the dump truck h for transportation, but it is more advantageous to do as shown in Fig. 6. be. In FIG. 6, an earth and sand tank d is mounted directly on a dump truck h, a suction hose X is directly connected to the earth and sand tank d on the dump car h, and the excavated earth and sand is placed directly on the dump car h. The earth and sand tank d on the dump truck h is provided with an inlet to be connected to the suction hose X at the lower rear end, and an outlet to be connected to the separator g at the upper front part. Inside the earth and sand tank d, while the air flow swirls along the tank wall, only the earth and sand settle, and only the air is discharged from the outlet. If necessary, the earth and sand placed in the tank d can be discharged by opening the side plate i at the rear end of the tank d and tilting the tank d.

This invention method can be used for laying water pipes, culverts, sewer pipes, etc.

(Effect of the invention) According to the present invention, a suction hose is installed in the propulsion pipe in the propulsion method, the tip of the suction hose is opened at the tip of the propulsion tube, and the rear end of the suction hose is connected to the dirt tank. It is then connected to a suction machine, and air is introduced from the opening at the end of the suction hose by the suction of the suction machine, so that the tip of the propulsion tube is found inside the suction hose, creating a flow of air that flows towards the sediment tank. The excavated earth and sand at the tip of the pipe can be carried by air flow, moved through the suction hose, and transported into the earth and sand tank. In this case, if the suction hose is only open at the tip, a large amount of cut earth and sand accumulates around the opening, and if the opening becomes covered with earth and sand, the earth and sand will be sucked in through the opening. However, in such a case, by introducing air auxiliary from the air inlet, the suction of the earth and sand can be made smoother. Furthermore, by introducing pressurized air from the air inlet, it is possible not only to smoothly suck in the sediment, but also to speed up the movement of the sediment and efficiently discharge the sediment. Can carry earth and sand. Therefore, it can be transported all the way to the earth tank. In addition, since the earth and sand are transported through the suction hose, the earth and sand are prevented from scattering outside the suction hose, and the inside of the propulsion tube can be kept clean to improve the working environment. Also,
Since a suction hose with a small cross-sectional area is sufficient, it is easy for people to come and go within the propulsion pipe, and therefore, the work is facilitated. Furthermore, since the grain size of the earth and sand is reduced to two-thirds or less of the inner diameter of the suction hose before being introduced into the suction hose, there is no risk of the earth and sand clogging the inside of the suction hose, and therefore, the earth and sand can be easily and reliably removed. Can be discharged. Furthermore, since the suction hose generates an air flow that flows toward the shaft, ventilation within the propulsion tube occurs naturally, and no special equipment or work is required for ventilation. Moreover, since there is no heavy object placed inside the propulsion tube other than the suction hose, propulsion by jacks becomes easy.

Furthermore, since the suction hose can be easily added, it becomes easy to move and connect the suction hose as the pipe is propelled, and therefore the propulsion method can proceed smoothly. Furthermore, since the discharged earth and sand is in a solid state, it can be used as it is for landfill and is easy to dispose of.

The present invention provides a number of such advantages.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of the ground schematically showing the method of this invention. FIG. 2 is a partially cutaway perspective view of the tip end of No. 1121. FIG. 3 is a partially cutaway perspective view of the equipment provided near the rear end in FIG. 1. FIG. 4 is a model diagram illustrating the operation of the equipment shown in FIG. 3. FIG. 5 is a partially cutaway surface view of another suction hose. FIG. 6 is a perspective view of other equipment provided along the rear end of the suction hose. In the figure, a is a leading pipe, b is a propulsion pipe, C is a starting shaft,
d is a dirt tank, e is a blower, and 1X is a suction hose. Patent Applicant: Hashimoto Seki Kogyo Co., Ltd. Figure Figure 'l 1-Cho Procedural Amendment April 17, 1989 1゜Indication of the Case 1986 Patent Application No. 186053 2゜Name of the Invention Excavation earth and sand in the propulsion method Method of discharging 4゜ Agent 5, Subject of amendment (Al Claims column of the specification (B) Detailed explanation of the invention column 6 of the specification, Contents of amendment (Al Annex for amendment of claims (Amendment to the Detailed Description of the Invention (1) Page 7, lines 2-15 of the specification states that "the steel pipes or humid pipes made in advance in the starting shaft" are as follows. ``A lead pipe is entered into the ground from the starting shaft, and after entering, a pre-made steel pipe or humid pipe is pushed in with the propulsion force of a junk, or after entering, a concrete pipe is constructed by forming an ogive. This is a method of burying pipes underground in this way.The buried steel pipes or humid pipes are corrected as follows.(2) On page 3 of the specification tube, line LO-12, it is written as ``In addition, earth and sand...defects.'' ``Also, the excavated earth and sand was discharged as slurry, but in this case too, the earth and sand was discharged exclusively by a trolley or belt conveyor. (3) On page 4, lines 10-16 of the specification, it says, ``There was a disadvantage that slurry was required...''. [As a large amount of slurry was added, the amount of soil to be discharged increased, and the slurry had to be discharged several times as much as the excavated soil, making it even more difficult to discharge the soil. In addition, there was another drawback in that the discharged slurry had to be dehydrated and disposed of, so it was not easy to dispose of it.'' (4) Correction, page 7, line 2 of the specification. , between ``discovered'' and ``this invention,'' ``Also, when the ground is clayey and contains a large amount of water, excavated soil may take on a viscous sludge-like appearance, but the above-mentioned It has been discovered that such viscous soil can be transported smoothly by providing an inlet for this purpose.'' (5) On page 7, lines 5-6 of the specification, insert ``Insert the propulsion pipe from the starting shaft. The phrase "...by burying the pipe underground" should be corrected to "by entering the lead pipe into the ground from the starting shaft, and after entering, by burying the propulsion pipe." (6) Specification No. On page 7, lines 14-15, the phrase ``excavated and suction hose...suds the earth and sand in solid form'' should be corrected to ``suction hose for the excavated earth and sand''. (7) Insert "If this is a pre-made pipe" between "Made" and "Starting shaft" on page 9, line 2 of the specification. (8) On page 12, line 16 of the specification, after the words ``Erased.'' ``It goes without saying that the earth and sand referred to here includes a viscous sludge-like substance. ” to join. (9) On page 16, lines 5-7 of the specification: [This is because the method of this invention is characterized by... ``This is because it is more advantageous to transport the earth and sand without turning it into slurry, as there is less stickiness inside the hose and the bulk is smaller.'' θ0) On page 16, line 8 of the specification, it says ``In this case.'' followed by ``However, it is also possible to add more water to make the earth and sand into a sludge-like or slurry-like form.J'' is added. ( 11) From page 18, line 7 to page 19, line 1 of the specification, it says, ``This invention is very advantageous in using excavated earth and sand.'' It is characterized by transporting the excavated earth and sand into the suction hose along with the air flow.Depending on the nature of the ground, some of the excavated earth and sand becomes sludge-like.
Also, some of the material is slurry-like due to the addition of lubricants during excavation, but the method of the present invention can transport all of them. However, it is desirable to transport the excavated earth and sand in solid form. This is because the volume of soil and sand that has been turned into slurry increases, and it is not allowed to be disposed of unless it is first dehydrated, and even if the dehydrated material is disposed of, it must be treated as industrial waste. This is because it cannot be disposed of as easily as ordinary earth and sand. ” he corrected. 02) On page 21, line 14 of the specification, the phrase ``because it was done'' was corrected to ``if it was decided''. (On page 22, lines 7-8 of the 131 Specification, there is a line 7-8 on page 22 that says, ``There is some excreted...'' in particular. amended as j. Attachments Amended claims One or more claims A guide pipe is entered into the ground from a starting shaft, and after entering, a propulsion pipe is buried underground (in the propulsion method, A suction hose is installed inside the propulsion tube, and the tip of the suction hose is opened by the tip of the propulsion tube, and an air inlet is provided in the middle of the suction hose, and the rear end of the suction hose passes through the dirt tank and sucks the suction. Connected to the machine, air is introduced from the opening at the end of the suction hose by the suction of the suction device, and air is introduced auxiliary from the air inlet, and the earth and sand excavated near the end of the propulsion tube is removed from the end of the suction hose. A method for discharging excavated soil in the propulsion method, which is characterized by moving the excavated soil on an air flow introduced from an opening, allowing the excavated soil to settle and collect in a soil tank.

Claims (1)

[Claims] In the propulsion method, in which the propulsion tube is forced into the ground from the starting shaft by the thrust of a jack and the tube is buried underground, a suction hose is installed inside the propulsion tube, and the tip of the suction hose is placed next to the tip of the propulsion tube. At the same time, an air inlet is provided in the middle of the suction hose, the rear end of the suction hose is connected to the suction machine via the sediment tank, and air is introduced from the opening at the tip of the suction hose by the suction of the suction machine. Air is introduced auxiliary from the air inlet, and the dirt, which has been excavated around the tip of the propulsion tube and whose particle size is less than two-thirds of the inner diameter of the suction hose, is collected in solid form at the tip of the suction hose. A method for discharging excavated soil in the propulsion method, which is characterized by moving the excavated soil on an air flow introduced from an opening, allowing the excavated soil to settle and collect in a soil tank.