JP2010047920A - Method for making tunnel boring machine arrive at arrival shaft - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for making a tunnel boring machine arrive at an arrival shaft, which facilitates the removal of a filler, and which enables the presence or absence of confined ground water and its confined condition to be detected before the removal of the filler. <P>SOLUTION: A partition wall 7 is installed at a predetermined spacing inward from an inner peripheral surface 6 of an arrival pit mouth 5 in the arrival shaft 1. A steel frame 8 is installed in such a manner as to surround an outer periphery between the inner peripheral surface 6 and the partition wall 7. The filler 9, which is in a solid state at a normal temperature in the arrival shaft 1 and which is put into a fluid state when the temperature reaches a predetermined temperature higher than the normal one, is infilled into the steel frame 8 between the inner peripheral surface 6 and the partition wall 7. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a reaching method when an excavator for excavating a tunnel reaches a reach shaft.

For example, in Patent Document 1, when a tunnel excavator is made to reach the arrival shaft, a partition wall is first installed in the arrival shaft at a predetermined interval from the inner peripheral surface of the arrival shaft, and then the arrival shaft is reached. A filler such as soil mortar is filled between the inner peripheral surface of the wellhead and the bulkhead to stabilize and solidify the reaching wellhead. A method for reaching a tunnel excavator is disclosed.
Japanese Patent Laid-Open No. 10-184268

However, the method for causing the tunnel excavator described in Patent Document 1 to reach the reaching shaft has the following problems.
(1) The removal work of the filler after the tunnel excavator reaches the inside of the reaching shaft is time-consuming and inefficient because the solidified filler is beaten manually.
(2) When the tunnel excavator reaches the reach shaft, the pressure is detected because the filler is solidified even if the groundwater under pressure exists between the tunnel excavator and the ground. I can't. And until all the filler is removed, it is impossible to detect the existence of the pressurized groundwater and its pressure level. Therefore, there is a possibility that the pressurized groundwater breaks the filler and ejects it into the reaching shaft while removing the filler.

  Therefore, the present invention has been made in view of the conventional problems as described above, and it is easy to remove the filler. It is an object of the present invention to provide a method for reaching a reaching shaft of a tunnel excavator that can be detected.

  In order to achieve the above object, the method for reaching the reaching shaft of the tunnel excavator according to the present invention is to install a partition wall in the reaching shaft at a predetermined interval from the inner peripheral surface of the reaching shaft entrance of the reaching shaft. And a filler that is in a solid state at a normal temperature in the reach shaft and is in a fluid state when a predetermined temperature higher than the normal temperature flows between the inner peripheral surface of the reach well and the partition wall. A filling step of filling in the state, and excavating the tunnel excavator from a natural ground into the reaching shaft, excavating a part of the reaching well and the filling material that has been cooled and solidified, and the tunnel An excavation step for stopping excavation when the leading portion of the excavator reaches a predetermined position in the filler, a fluidizing step for heating the filler to a fluidized state, and the fluidized state in the fluidizing step. Measure the pressure value of the filler Based on the pressure value, a determination step for determining whether or not pressure of the pressurized groundwater is acting on the fluidized filler, and in the determination step, the pressure of the pressurized groundwater on the fluidized filler And a discharging step of removing the fluidized filler when the liquid is not acting (first invention).

  According to the tunnel drilling machine reaching method of the present invention, the filling material filled between the inner peripheral surface of the reaching well and the partition wall becomes a fluidized state when heated, so that the fluidized filler is pumped. It can be discharged with a soil removal device provided in a tunnel excavator. Therefore, the discharge operation can be performed efficiently in a short time.

  Also, in the judgment process, if pressurized groundwater exists between the tunnel excavator and the natural ground, the pressure of the pressurized groundwater acts on the filler in the flowing state, and the pressure in the filler changes. Therefore, by measuring the pressure at that time, it is possible to detect the presence / absence of pressurized groundwater and the pressure situation. Therefore, before removing the filler, it is possible to grasp the presence / absence of pressurized groundwater and the pressure situation.

In the present invention, in the determination step, when pressure of groundwater under pressure acts on the filler in the fluidized state, a groundwater improvement is performed by injecting a water-stopping material into a ground near the reaching pit. The determination step may be executed again.
According to the method for reaching the reach shaft of the tunnel excavator according to the present invention, when the pressure of the groundwater under pressure is acting on the filler, the groundwater of the ground is improved and the groundwater under pressure inside the filler is improved. Therefore, the pressure of the groundwater under pressure acting on the filler can be reduced.

In the present invention, the filler may be a higher alcohol, a higher fatty acid, or a fatty acid ester.
According to the reach method of the tunnel excavator according to the present invention, the higher alcohol, the higher fatty acid and the fatty acid ester have biodegradability and are decomposed into water and air over time, Does not adversely affect the environment.

In the present invention, the filler may contain an additive containing any one of higher alcohol, higher fatty acid, and fatty acid ester, and a granular material such as sand, slag, and clay.
According to the reach method of the tunnel excavator according to the present invention, the higher alcohol, the higher fatty acid and the fatty acid ester have biodegradability and are decomposed into water and air over time, Does not adversely affect the environment. Additives containing higher alcohols, higher fatty acids and fatty acid esters are mixed by mixing additives containing any of higher alcohols, higher fatty acids and fatty acid esters with powders such as sand, slag and clay. Therefore, the material cost of the filler can be reduced.

In the present invention, the higher alcohol may be lauryl alcohol.
According to the method for reaching the reach shaft of the tunnel excavator according to the present invention, the higher alcohol is lauryl alcohol, which is a common raw material, so that the raw material can be easily obtained.

In the present invention, the higher fatty acid may be lauric acid.
According to the tunnel drilling machine reaching method of the present invention, since the higher fatty acid is lauric acid and is a general raw material, the raw material can be easily obtained.

In the present invention, the fatty acid ester may be a stearic acid ester.
According to the method for reaching the reaching shaft of the tunnel excavator according to the present invention, since the fatty acid ester is a stearic acid ester and is a general raw material, it is easy to obtain the raw material.

In the present invention, the partition may include a heating device for heating the filler.
According to the reaching method of the tunnel excavator of the tunnel excavator according to the present invention, since the partition wall is provided with a heating device for heating the filler, the filler can be brought into a fluid state in a short time.

In the present invention, the partition may include a cooling device for cooling the filler.
According to the tunnel drilling machine reaching method of the present invention, since the partition wall includes a cooling device for cooling the filler, the filler can be brought into a solid state in a short time.

  By using the tunnel excavator reaching method of the tunnel shaft of the present invention, it is possible to detect the presence of groundwater between the tunnel excavator and the natural ground and the state of the pressure in the state filled with the filler. . Moreover, the filler can be removed in a short time by fluidizing the solid filler.

  Hereinafter, a preferred embodiment of a method for reaching a reaching shaft of a tunnel excavator according to the present invention will be described in detail with reference to the drawings.

  FIG.1 and FIG.2 is the side view and top view of the reach shaft 1 which concern on 1st embodiment of this invention, respectively. In the following drawings, illustration of parts unnecessary for the description of the present invention is omitted.

  As shown in FIGS. 1 and 2, the reaching shaft 1 is surrounded by a cylindrical earth retaining wall 2, and concrete is placed on the bottom base 3 inside thereof. This reach shaft 1 is constructed at a planned arrival position of the shield machine 4 (details will be described later), and is used as a work area for performing the reach work of the shield machine 4. The shield machine 4 excavates the reaching pit 5 portion of the retaining wall 2 and enters the reaching shaft 1.

  A partition wall 7 is installed in the arrival shaft 1 at a predetermined interval inward from the inner peripheral surface 6 of the arrival shaft 5. In addition, the end face abuts on the inner peripheral surface 6, and the steel frame 8 is installed so as to surround the outer periphery of the partition wall 7, and a sealed space S is formed between the arrival well 5 and the partition wall 7. The space S is filled with a filler 9 which is in a solid state at a normal temperature in the reach shaft 1 and is in a fluid state at a predetermined temperature higher than the normal temperature.

The filler 9 is an additive containing a higher alcohol lauryl alcohol (for example, Calcoal 2098 (product name, Calcoal: registered trademark, manufactured by Kao Corporation)).
Around 20 ° C., which is the normal temperature in the shaft 1, lauryl alcohol (in this embodiment, calcoal 2098) is in a solid state and has a uniaxial compressive strength equivalent to the natural ground 21 that can be easily excavated by the shield machine 4 ( For example, it has about 0.5-1.0 MPa.

  An injection device 10 for manufacturing and supplying the filler 9 is provided on the ground. The injection device 10 includes a tank 11 with a temperature regulator for storing the filler 9 and performing temperature management, and an injection pump 13 for supplying the filler 9 via the injection pipe 12.

  When the filler 9 becomes higher than the melting point of lauryl alcohol (in this embodiment, 23.5 ° C. to 26.5 ° C., which is the melting point of calcoal 2098), the lauryl alcohol is liquefied and becomes a fluid state. Therefore, the inside of the tank 11 with a temperature regulator is set to about 26 ° C., for example, so that the filler 9 is maintained in a fluid state.

The filler 9 is kept at a temperature equal to or higher than the melting point and is filled between the arrival well 5 and the partition wall 7 in a fluid state.
A pressure gauge 15 for measuring the pressure of the filler 9 in the fluidized state is attached to the surface 14 of the partition wall 7 on the side filled with the filler 9.
A plurality of Peltier elements 17 are attached to the surface 16 of the partition wall 7 opposite to the side filled with the filler 9. The Peltier element 17 heats or cools the surface in contact with the partition wall 7 by changing the direction of the current flowing through the Peltier element 17, and heats or cools the filler 9 via the partition wall 7.
A support device 18 is provided for supporting the filler 9 and the partition wall 7 against the propulsive force of the shield machine 4 when the shield machine 4 enters the reach shaft 1 and digs through the filler 9. ing.

  The support device 18 is provided between the support member 19 that supports the partition wall 7 so as not to move with respect to the propulsive force of the shield machine 4, and the partition member 7 and the support member 19. It comprises a plurality of jacks 20 for reliably transmitting to the support material 19.

  Next, the reaching method of the shield machine 4 according to this embodiment into the reaching shaft 1 will be described according to the construction procedure.

FIG. 3 is an enlarged view of the vicinity of the arrival shaft 5. As shown in FIG. 3, the partition wall 7 is installed at a predetermined interval from the inner peripheral surface 6 of the arrival wellhead 5. And while the end surface contacts the inner peripheral surface 6, the steel frame 8 is installed so as to surround the outer periphery of the partition wall 7, and a sealed space S is formed between the arrival well 5 and the partition wall 7.
Next, the filler 9 kept in a fluid state in the tank 11 with a temperature regulator is filled into the space S through the injection pipe 12. The pressure in the filler 9 in a state in which the filler 9 is filled is measured by the pressure gauge 15, and the measured value is set as the initial pressure.
After filling with the filler 9, current is supplied to cool the surface of the Peltier element 17 that is in contact with the partition wall 7, and the filler 9 is cooled via the partition wall 7. The filler 9 becomes a solid state in a short time by being cooled.

FIG. 4 is a schematic overall view of the shield machine 4.
As shown in FIG. 4, the shield machine 4 includes a cutter 22 for excavating the natural ground 21, a soil removal device 23 for discharging the excavated earth and sand, and a cylindrical casing for enclosing these devices. 24.

5 and 6 are a side view and a plan view, respectively, showing a state where the shield machine 4 has reached the reaching shaft 1.
As shown in FIGS. 5 and 6, the shield machine 4 is dug from the natural ground 21 into the arrival shaft 1, and the arrival hole 5 portion of the retaining wall 2 and the filler 9 in a solid state are excavated, and the shield The machine 4 enters the reaching shaft 1. When the head of the shield machine 4 reaches a predetermined position in the filler 9, the excavation is stopped.

  Next, energization is performed so that the surface of the Peltier element 17 in contact with the partition wall 7 is heated, and the filler 9 is heated through the partition wall 7. When heated, the filler 9 gradually fluidizes. In this state, when pressurized groundwater exists between the shield machine 4 and the natural ground 21, that is, in the overcut portion OC, the pressure of the pressurized groundwater acts on the fluidized filler 9. Thus, since the pressure in the filler 9 becomes larger than the initial pressure, it is possible to detect the presence of pressurized groundwater. Further, the degree of groundwater pressure can be determined from the difference between the pressure value and the initial pressure. When the value of the pressure in the filler 9 is larger than the initial pressure, the pressurized groundwater exists. Therefore, if the filler 9 is fluidized and removed, the pressurized groundwater may be ejected. For this reason, the heating of the filler 9 is temporarily stopped to stop fluidization, and the ground around the tunnel 25 is improved.

  Even if the pressure of the groundwater under pressure acts on the filler 9 in the fluidized state, the filler 9 is covered with the steel frame 8 and the partition wall 7, so that the filler 9 can reach the reach shaft 1 with the groundwater under pressure. It does not erupt inside.

7 and 8 are a side view and a plan view, respectively, showing a state in which the periphery 26 of the tunnel 25 is ground improved.
As shown in FIGS. 7 and 8, the ground solution is improved by injecting a chemical solution or the like around the tunnel 25 to prevent inflow of pressurized groundwater into the overcut portion OC. In the present embodiment, the case of injecting a chemical solution or the like into the periphery 26 of the tunnel 25 has been described. However, the present invention is not limited to this. A chemical solution or the like may be injected.
And again, the pressure in the filler 9 is measured. Therefore, when a pressure value higher than the initial pressure is measured, the water stoppage countermeasure is implemented again.

  On the other hand, when there is no pressurized groundwater in the overcut portion OC or when the above-described water stoppage measures are implemented satisfactorily, the pressure value in the filler 9 is substantially the same as the initial pressure. In these cases, fluidization of the filler 9 is continued, and the soil removal device 23 of the shield machine 4 is operated, and the fluidized filler 9 is discharged by the soil removal device 23 of the shield machine 4. In the present embodiment, the method of discharging the fluidized filler 9 with the earth removing device 23 has been described. However, the present invention is not limited to this, and the filler 9 may be discharged with a vacuum pump or the like. Well, both may be used together.

By heating and dissolving the filler 9, it is possible to remove the filler 9 before removing the partition wall 7, so that the state of the spring water can be reliably grasped. Moreover, when there is spring water, the water stopping measures are taken to completely stop the spring water, and then the partition wall 7 is removed, so that the removal work can be performed safely.
After all the fillers 9 are removed, the partition wall 7 is removed, and the shield machine 4 is disassembled and carried out.

  In the present embodiment, the initial pressure of the fluidized filler 9 measured after filling the filler 9 and the pressure measured when fluidizing the solid filler 9 after the shield machine 4 arrives. However, the present invention is not limited to this, and it is not limited to this. When fluidizing the solid-state filler 9 without measuring the initial pressure, In the case where the pressure groundwater is present in the overcut portion OC, the pressure at that time is remarkably increased, so the presence of the pressure groundwater can be detected.

  As described above, according to the arrival method of the shield machine 4 of the present embodiment, the filler 9 filled in the space S between the arrival wellhead 5 and the partition wall 7 becomes a fluid state when heated. It can be discharged by the earth removing device 23 of the machine 4. Therefore, the discharge operation can be performed efficiently in a short time.

  Further, by measuring the pressure in the filler 9 while fluidizing the filler 9 in the solid state, it is possible to detect the presence / absence of the pressurized groundwater and the pressure situation. Therefore, before removing the filler 9, it is possible to grasp the presence / absence of the pressurized groundwater in the overcut portion OC and the pressure situation. And when the pressure groundwater exists in the overcut part OC, the inflow of the groundwater to the overcut part OC is eliminated by implementing the water stoppage measures such as ground improvement around the tunnel 25, and the filler Since the ejection of ground water when removing 9 is prevented, the removal work of the filler 9 can be performed safely.

  In addition, since lauryl alcohol in the filler 9 has biodegradability, it decomposes and disappears into water and air over time, and does not adversely affect the environment. And since lauryl alcohol is a general raw material, acquisition of a raw material is easy.

  Furthermore, since the Peltier element 17 for heating and cooling the filler 9 is attached to the partition wall 7, the filler material 9 can be heated and cooled via the partition wall 7.

Next, a second embodiment of the present invention will be described. In the following description, portions corresponding to the first embodiment are denoted by the same reference numerals, description thereof is omitted, and differences are mainly described.
In the second embodiment, a filler 28 containing an additive containing lauryl alcohol and a granular material 27 made of sand or clay is used.

FIG. 9 is a diagram showing a state in which the filler 28 according to the second embodiment of the present invention is filled.
As shown in FIG. 9, a filler 28 is filled between the inner peripheral surface 6 of the reaching wellhead 5 and the partition wall 7. The filler 28 contains the additive containing the above-mentioned lauryl alcohol (for example, calcoal 2098) and sand or clay powder 27.

In addition, in this embodiment, although the case where sand and clay were used as the granular material 27 was demonstrated, it is not limited to this, For example, fly ash, blast furnace slag, bentonite etc. are used as the granular material 27. Moreover, you may use, and you may use not only the powder body 27 but combining it alone.
As in the first embodiment, the filler 28 is in a solid state at around 20 ° C., which is the normal temperature in the shaft 1, and is liquefied and fluidized at 23.5 ° C. to 26.5 ° C.

  According to the reaching method of the shield machine 4 of the present embodiment, the amount of the additive containing the expensive higher alcohol is increased by mixing the additive containing the lauryl alcohol and the powder 27 such as sand and clay. Since it can be reduced, the material cost of the filler 28 can be reduced.

  In each of the above-described embodiments, the method of using the higher alcohol lauryl alcohol as the fillers 9 and 28 has been described. However, the present invention is not limited to this. For example, the higher fatty acid lauric acid (for example, LUNAC L -70 (product name, LUNAC: registered trademark, manufactured by Kao Corporation)) or stearic acid esters of fatty acid esters, etc., which are in a solid state at around 20 ° C., which is the normal temperature in the shaft 1 And has a uniaxial compressive strength (for example, about 0.5 to 1.0 MPa) similar to that of the natural ground 21, and the inside of the reach shaft 1 becomes higher than the normal temperature and has a melting point (for example, Lunac L-70 When the temperature is 32 ° C. to 36 ° C. or higher, the fluidized state is obtained, so that it can be handled in the same manner as the higher alcohol lauryl alcohol. Moreover, since the higher fatty acid lauric acid and the fatty acid ester stearate are also biodegradable, they are decomposed and lost to water and air over time without adversely affecting the environment.

  Moreover, in each embodiment mentioned above, although the case where the ground of the circumference | surroundings 26 of the tunnel 25 was improved after confirming presence of pressurized groundwater was demonstrated, it is not limited to this, The shield machine 4 is dug Before, the tunnel 25 part and its surroundings 26 may be improved in advance.

  And in each embodiment mentioned above, although the case where it reached | attains the reach shaft 1 with the shield method using the shield machine 4 was demonstrated, it is not limited to this, The reach shaft with the propulsion method using the propulsion device It can also be applied when 1 is reached.

  Further, in each of the above-described embodiments, the method of heating and cooling the filler 28 by installing the Peltier element 17 on the side surface of the partition wall 7 has been described. However, the present invention is not limited to this. 9 and 28 may be heated, or the fillers 9 and 28 may be cooled with water.

It is a side view of the reaching shaft which concerns on 1st embodiment of this invention. It is a top view of the reaching shaft which concerns on 1st embodiment of this invention. It is an enlarged view of the vicinity of the arrival pit. It is a schematic whole view of a shield machine. It is a side view which shows the arrival state to the reaching shaft of a shield machine. It is a top view which shows the arrival state to the reaching shaft of a shield machine. It is a side view which shows the state which improved the ground around the tunnel. It is a top view which shows the state which improved the ground around the tunnel. It is a figure which shows the state which filled the clearance gap with the filler which concerns on 2nd embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reaching shaft 2 Earth retaining wall 3 Bottom plate 4 Shield machine 5 Reaching well entrance 6 Inner peripheral surface 7 Bulkhead 8 Steel frame 9 Filling material 10 Injection device 11 Tank with temperature regulator 12 Injection pipe 13 Injection pump 14 The side where the filling material is filled Surface 15 of the partition wall Pressure gauge 16 Surface 17 of the partition wall opposite to the side where the filler is filled 17 Peltier element 18 Supporting device 19 Supporting material 20 Jack 21 Ground 22 Cutter 23 Earth removing device 24 Body 25 Tunnel 26 Around 27 Powder body 28 Filler S Space OC Overcut part

Claims (9)

In the reaching method for making the tunnel excavator reach the reaching shaft,
A partition installation step of installing a partition in the reaching shaft at a predetermined interval from an inner peripheral surface of the reaching shaft of the reaching shaft,
Filling material that is in a solid state at a normal temperature in the reach shaft and in a fluid state at a predetermined temperature higher than the normal temperature in a fluid state between the inner peripheral surface of the arrival shaft and the partition wall. Filling process
The tunnel excavator is excavated from a natural ground into the reaching shaft, and a part of the reaching shaft and the filler that has been cooled and solidified are excavated. An excavation process for stopping excavation when reaching a predetermined position in the material;
A fluidizing step of heating the filler to a fluidized state;
A determination step of measuring a pressure value of the fluidized filler in the fluidizing step and determining whether pressure of groundwater under pressure acts on the fluidized filler based on the pressure value; ,
And a discharge step of removing the fluidized filler when the pressured groundwater pressure is not acting on the fluidized filler in the determination step. How to reach   In the determination step, when pressure of groundwater under pressure acts on the filler in the fluidized state, a water stoppage material is injected into the ground near the reaching pit to improve the ground, and the determination step The method for reaching the reaching shaft of the tunnel excavator according to claim 1, wherein:   The method for reaching a reaching shaft of a tunnel excavator according to claim 1 or 2, wherein the filler is any one of higher alcohol, higher fatty acid, and fatty acid ester.   3. The tunnel excavation according to claim 1, wherein the filler contains an additive containing any one of higher alcohol, higher fatty acid, and fatty acid ester, and a granular material such as sand, slag, and clay. How to reach the machine shaft.   The method for reaching a reaching shaft of a tunnel excavator according to claim 3 or 4, wherein the higher alcohol is lauryl alcohol.   The method for reaching a reaching shaft of a tunnel excavator according to claim 3 or 4, wherein the higher fatty acid is lauric acid.   The said fatty acid ester is a stearic acid ester, The arrival method to the reaching shaft of the tunnel excavator of Claim 3 or 4 characterized by the above-mentioned.   The said partition is provided with the heating apparatus for heating the said filler, The arrival method to the reaching shaft of the tunnel excavator as described in any one of Claims 1-7 characterized by the above-mentioned.   The said partition is provided with the cooling device for cooling the said filler, The reach | attainment method of the tunnel excavator as described in any one of Claims 1-8 characterized by the above-mentioned.

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