JP4806370B2 - Vertical shaft construction method - Google Patents

Description

  The present invention relates to a shaft construction method for constructing a vertical shaft by excavating the ground to form an excavation shaft extending in the vertical direction, filling the excavation shaft with a curing filler, and building a pile material.

After excavating the ground to form an excavation pit that extends in the vertical direction, the excavation pit is filled with soil mortar, the lower pile material is built below the excavation mine, and then the upper pile material is installed above the excavation pit There is a shaft construction method for constructing a shaft (see Patent Document 1). The details of this shaft construction method will be described as follows. The top of the lower pile material is supported by a support member, and the lower pile material is built downward along the excavation mine together with the support member. After the lower pile material is built in the excavation mine, the support member is removed from the lower pile material, and the support member is pulled out from the excavation mine. Next, the upper pile material is built in the excavation pit, the top of the lower pile material and the bottom of the upper pile material are spaced apart by a predetermined dimension in the vertical direction, and the top of the upper pile material is fixed on the ground. Maintain a separated state between the top of the material and the bottom of the upper pile. After the soil mortar is cured and cured for a predetermined period, the top of the upper pile material is released. This shaft construction method can create an area of only soil mortar where there is no pile material between the top of the lower pile material and the bottom of the upper pile material, and a shield machine between the lower pile material and the upper pile material Can be formed as it is.
JP-A-5-187184

  In the shaft construction method disclosed in Patent Document 1, there is no means for holding and fixing the lower pile material built below the excavation mine at the erection position until the soil mortar filled in the excavation mine is cured. Since the lower pile material gradually settles in the mortar, the lower pile material cannot be installed at the digging pit position, and the distance between the top of the lower pile material and the bottom of the upper pile material is constant. Without a certain shape of the area through which the shield machine can pass. Also, this vertical shaft construction method cannot stabilize the posture of the lower pile material, and the lower pile material moves inadvertently in the excavation mine until the soil mortar filled in the excavation mine is cured, and excavation It may not be possible to install the lower core material upright in the mine. In this shaft construction method, it is difficult to position the upper pile material and the lower pile material connected below the upper pile material, and the lower pile material may not be positioned directly below the upper pile material.

  The object of the present invention is to construct a vertical shaft that can be installed in a posture in which the pile material is substantially upright at the position where the excavation mine is built, and that allows a shielded machine to pass between the pile materials. It is to provide a method.

  The premise of the present invention to solve the above problems is that the excavation pit is formed by excavating the ground and filling the excavation mine with a curing filler, and a vertical pile is built in the vertical direction. It is a vertical shaft construction method.

  The feature of the present invention based on the above premise is that the pile material has first and second pile materials that are opposed to each other and are arranged in the axial direction, and extends in the axial direction. A first steel wire that reaches a predetermined position of the second pile material from the opposed end portion beyond the opposed end portion of the pile material, and extends in the axial direction from the non-opposed end portion of the first pile material. A second steel wire that reaches a predetermined position of the second pile material across the opposite end, a first support member that is attached to the first pile material and supports the first steel wire slidably, and a second pile A second support member that can be attached to the material and can support the first steel wire and can be separated from the first steel wire, and a second support member that can be attached to the second pile material and can support the second steel wire and can be separated from the second steel wire The first steel wire in the state where the first steel wire is tensioned between the first support member and the second support member. 2 Pile material erection process to build the pile material, and while supporting the second steel wire on the ground, the first steel wire is separated from the second support member, the first steel wire is pulled out from the excavation mine and the first pile material is The first pile material pulling step for pulling upward in the vertical direction and separating the opposing ends of the first pile material and the second pile material in the vertical direction by a predetermined dimension, and curing the filler, 3 to have a second steel wire drawing step of separating the second steel wire from the excavation mine by separating from the support member.

  As an example of the present invention, the first and second pile members are first and second opposing walls that are spaced apart from each other and extend in the axial direction, and a connecting wall that is positioned between the opposing walls and extends in the axial direction. H-shaped rope having a first corner and a second corner formed at the intersection of the first opposing wall and the connecting wall, and a first corner formed at the intersection of the second opposing wall and the connecting wall. A third corner portion that opposes the second corner portion and a fourth corner portion that opposes the second corner portion, wherein the first steel wire is disposed at the first corner portion and the fourth corner portion, and the second steel wire is the second corner portion. It arrange | positions at the corner | angular part and the 3rd corner | angular part.

  As another example of the present invention, the first pile material is formed from a main pile material and a temporary pile material that have opposing end portions that contact each other and are arranged in the axial direction. The temporary pile material is removed from the main pile material after the temporary pile material is pulled up to the ground so that the length dimension of the material matches the distance between the opposing end portions of the first and second pile materials.

  As another example of the present invention, the pile material includes a support plate that extends in the axial direction across the opposite end portions of the first pile material and the second pile material, and the support plate includes the first pile material and the second pile. It is attached to either one of the materials and supports these pile materials from the axial direction.

  As another example of the present invention, a high frequency induction heating coil is installed in the second support member and the third support member, and the high frequency induction heating coil generates eddy currents in the first and second steel wires to generate them. The steel wires are separated from the second and third support members by causing the steel wires themselves to break by exothermic heat.

  According to the shaft construction method according to the present invention, since the second pile material located below the excavation mine is supported by the second steel wire until the filler is cured, the second pile material is in the filler. The second pile material can be reliably installed at the position where the excavation mine is built. Moreover, the separation | spacing dimension of the opposing edge part of a 1st pile material and the opposing edge part of a 2nd pile material can be kept constant, and a shield machine can pass between a 1st pile material and a 2nd pile material. An area with a uniform shape can be created. In this shaft construction method, since the second pile material is supported by the second steel wire, the posture of the second pile material can be stabilized, and the second pile material does not move inadvertently in the excavation mine. The second pile material can be installed in a posture in which the second pile material is substantially upright at the position where the excavation mine is built. In this shaft construction method, positioning of the first pile material and the second pile material continuous below the first pile material is easy, and the second pile material can be surely positioned directly below the first pile material.

  The first and second pile members are H-shaped ropes, the first steel wire is disposed at the first corner and the fourth corner of the H-shaped rope, and the second steel wire is the second corner of the H-shaped rope. Since the pair of first steel wires are located on the diagonal of the H-shaped rope and the pair of second steel wires are located on the diagonal of the H-shaped rope, The force when pulling out the 1 steel wire or the 2nd steel wire from the excavation mine does not act on the first pile material or the second pile material, and the first and second pile materials built in the excavation mine It is possible to prevent the displacement movement at the time of drawing the steel wire. In this shaft construction method, the first and second pile members can be reliably installed in a posture in which the first and second pile members are substantially upright at the position where the excavation shaft is built, and the second pile member is surely positioned directly below the first pile member. Can be made.

  The temporary pile material is formed so that the first pile material is formed from the main pile material and the temporary pile material, and the length dimension of the temporary pile material matches the separation dimension between the opposed end portions in the first and second pile materials. The shaft construction method to remove the temporary pile material from the main pile material after raising it to the ground is determined by raising the temporary pile material to the ground to determine the distance between the opposing ends of the first and second pile materials. It is not necessary to adjust the distance between the opposing ends of the first and second pile materials while adjusting the lifting height of the material, and the opposing ends of the first and second pile materials by using a temporary pile material The distance between the two can be adjusted accurately. This shaft construction method can change easily the separation dimension of the opposing edge parts in the 1st and 2nd pile materials by changing the length dimension of temporary pile materials, and the 1st pile material and the 2nd pile material A region having a fixed shape in which no pile material is present can be surely formed.

  In the shaft construction method in which the support plate is attached to one of the first and second pile members and supports the pile members from the axial direction, the connection and posture of the first and second pile members are held by the support plate. Therefore, when the pile materials are built in the excavation mine, the connection of the pile materials is not inadvertently released, and the pile materials are surely kept in an upright position at the construction position of the excavation mine. Can be installed.

  The shaft construction method in which the high-frequency induction heating coil generates eddy currents in the first and second steel wires and heats and breaks the steel wires themselves generates heat from the first and second steel wires by the eddy current. Compared with the case where heat is applied to these steel wires, the steel wires can be reliably broken, and the steel wires can be prevented from being separated from the second and third support members.

  The details of the shaft construction method according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a diagram illustrating an example of a pile material 10A, and FIG. 2 is an end view taken along line AA in FIG. 3 is an end view taken along the line BB of FIG. 1, and FIG. 4 is an end view taken along the line CC of FIG. FIG. 5 is a diagram illustrating an example of the second and third support members 17 and 18. In FIG. 1, the axial direction is indicated by an arrow L1. In this shaft construction method, the ground 38 is excavated by using an excavator to form an excavation pit 41 extending in the vertical direction from the surface 39 to the underground 40, and a soil mortar 42 (curing filling) is provided in the excavation mine 41. Material) and the pile material 10A is built in the excavation pit 41 to construct the vertical shaft 43 (see FIG. 6). The pile material 10A used for the shaft construction method includes a first pile material 11 and a second pile material 12, a pair of support plates 13 that support the pile materials 11 and 12, a first steel wire 14 and a second steel wire. 15 and first to third support members 16, 17, 18 that support the steel wires 14, 15.

  The first pile material 11 and the second pile material 12 are arranged in a straight line in the axial direction in a state where their one end portions 19 and 20 (opposing end portions) are in contact with each other. The pile members 11 and 12 are H-shaped ropes that are long in the axial direction, and are positioned between the first and second opposing walls 21 and 22 that are spaced apart from each other and extend in the axial direction, and the opposing walls 21 and 22. And a connecting wall 23 extending in the axial direction. The pile members 11, 12 are formed by intersecting the first opposing wall 21 and the connecting wall 23 with a substantially right-angled first corner 24 formed at the intersection (intersection) between the first opposing wall 21 and the connecting wall 23. Formed at a point (intersection) and formed at a crossing point (intersection) between the second corner 25 having a substantially right angle located on the opposite side of the first corner 24 and the second opposing wall 22 and the connecting wall 23. A substantially right-angled fourth corner formed at the intersection (intersection) of the substantially right-angled third corner portion 26 facing the corner portion 24 and the second facing wall 22 and the connecting wall 23 and facing the second corner portion 25. And corners 27.

  The support plates 13 are rectangular steel plates that are long in the axial direction. The support plate 13 extends in the axial direction across the end portions 19 and 20 of the first and second pile members 11 and 12. The support plate 13 abuts against the opposing walls 21 and 22 at the end portions 19 and 20 of the pile members 11 and 12, and is fixed to the opposing walls 21 and 22 of the first pile member 11 via fixing means (not shown). Has been. The support plate 13 supports the pile members 11 and 12 from the axial direction, prevents the displacement of the pile members 11 and 12, and maintains the connection between the pile members 11 and 12. The support plate 13 may be fixed to the opposing walls 21 and 22 of the second pile material 12 without being fixed to the first pile material 11.

  PC steel twisted wires are used for the first steel wire 14 and the second steel wire 15. The first steel wire 14 is disposed at the first corner portion 24 and the fourth corner portion 27 of the first and second pile members 11 and 12, and extends in the axial direction along the pile members 11 and 12. As for the 1st steel wire 14, a pair of them is located in the diagonal of an H-shaped rope. The first steel wire 14 extends from the other end portion 28 (non-opposing end portion) of the first pile member 11 to the end portions 19 and 20 of the pile members 11 and 12 and the end portion 20 of the second pile member 12. It has reached the inside (the center of the pile material 12). In the first steel wire 14, an end portion 29 located on the end portion 28 side of the first pile material 11 extends axially outward from the end portion 28 of the pile material 11. The second steel wire 15 is disposed at the second corner portion 25 and the third corner portion 26 of the first and second pile members 11 and 12, and extends in the axial direction along the pile members 11 and 12. As for the 2nd steel wire 15, a pair of them is located in the diagonal of an H-shaped rope. The second steel wire 15 extends from the other end portion 28 (non-opposing end portion) of the first pile member 11 to the end portions 19 and 20 of the pile members 11 and 12 and the end portion 20 of the second pile member 12. It has reached the inside (the center of the pile material 12). In the second steel wire 15, an end portion 30 located on the end portion 28 side of the first pile material 11 extends outward from the end portion 28 of the pile material 11 in the axial direction.

  The first support member 16 is disposed inside the end portion 19 of the first pile material 11, and is fixed to the first corner portion 24 and the fourth corner portion 27 of the connection wall 23 of the pile material 11 (not shown). (See FIG. 3). The first support member 16 presses the first steel wire 14 from the circumferential direction and supports the steel wire 14. However, the steel wire 14 can slide on the support member 16 and can be removed from the support member 16. Therefore, when the end portion 29 of the first steel wire 14 is pulled strongly outward in the axial direction, the steel wire 14 slides on the first support member 16, and the steel wire 14 is gradually pulled out from the support member 16. The second support member 17 is disposed inside the end portion 20 of the second pile member 12 (the center portion of the pile member 12), and the first corner portion 24 and the fourth corner portion 27 in the connection wall 23 of the pile member 12 are It is fixed via a fixing means (not shown) (see FIG. 2). The second support member 17 is formed of a fixing portion 31 that fixes and supports the first steel wire 14 and a high-frequency induction heating coil 32 that separates the steel wire 14 from the support member 17. In the fixing portion 31, the first steel wire 14 is supported so that it cannot be removed. The inter-member portion 33 between the first support member 16 and the second support member 17 of the first steel wire 14 is supported by the support members 16 and 17 while being pulled outward in the axial direction. Therefore, the inter-member portion 33 is in a tensioned state, and the connection between the first and second pile members 11 and 12 is maintained by the steel wire 14.

  The third support member 18 is disposed inside the end portion 20 of the second pile material 12 (the center portion of the pile material 12), and the second corner portion 25 and the third corner portion 26 in the connection wall 23 of the pile material 12. It is fixed via a fixing means (not shown) (see FIG. 2). The third support member 18 is formed of a fixing portion 34 that fixes and supports the second steel wire 15 and a high-frequency induction heating coil 35 that separates the steel wire 15 from the support member 18. In the fixing portion 34, the second steel wire 15 is supported so as not to be removable. A high frequency generator (not shown) is connected to the high frequency induction heating coils 32, 35 of the second and third support members 17, 18 via a wiring 57. When a high frequency voltage is applied to the high frequency induction heating coils 32 and 35 from the high frequency generator, a high frequency current flows through the coils 32 and 35, and a magnetic flux is generated in a direction interlinking with the high frequency current. When the generated magnetic flux acts on the first and second steel wires 14 and 15, eddy currents are generated in the steel wires 14 and 15, and the steel wires 14 and 15 themselves generate heat (Joule heat). In the heated parts 36 and 37, the strength of the steel wires 14 and 15 is significantly reduced. When the portions 36 and 37 of the steel wires 14 and 15 are heated to a high temperature in a state where tension is applied to the steel wires 14 and 15, the steel wires 14 and 15 are moved to the portions 36 and 37 due to the tension acting on the portions 36 and 37. And is separated from the second and third support members 17 and 18.

  FIG. 6 is an explanatory diagram of a pile material building process for building the pile material 10 </ b> A into the excavation mine 41, and FIG. 7 is an explanatory diagram of a first pulling process for pulling up the first pile material 11. 8 is an end view taken along the line DD of FIG. In FIG. 6, the vertical direction is indicated by an arrow L2. As a preparation before the pile material 10A is built in the excavation pit 38, an excavator (not shown) is used to excavate the ground 38 to create a vertical excavation pit 41. Fill with (curing filler). In addition, the pile material 10A of FIG. 1 is prepared. After those preparations are completed, the pile material 10A is built in the excavation mine 41 (pile material building step). The end of the pile material 10A (the end portion 28 of the first pile material 11) is supported by the sling 45 of the crane 44, and the pile material 10A is vertically raised by the crane 44 and lifted in the air. Move to the top.

  In the pile material 10 </ b> A held by the crane 44, the first pile material 11 is located above, and the second pile material 12 is located below the pile material 11. After the pile material 10A is positioned at the upper portion of the excavation mine 41, the pile material 10A is gradually built into the excavation mine 41 from its end portion (end portion 46 of the second pile material 12) by the crane 44, as shown in FIG. In this way, most of the pile material 10A is embedded in the excavation mine 41 (soil mortar 42) with the end portion of the pile material 10A (end portion 28 of the first pile material 11) exposed to the ground. In the pile material building step, the inter-member portion 33 extending between the first and second support members 16 and 17 of the first steel wire 14 is in a tension state, and the support plate 13 is the first and second pile materials. Since the end portions 19 and 20 of the 11 and 12 are supported, there is no inadvertent displacement between the pile materials 11 and 12, and the connection of the pile materials 11 and 12 is maintained.

  When the pile material building process is finished, the first pile material 11 is then pulled up to a predetermined height in the vertical direction (first pile material pulling process). In the first pile material lifting step, the high frequency generator is applied to the high frequency induction heating coil 32 of the second support member 17 in a state where the end portion 30 exposed to the ground of the second steel wire 15 is fixed on the ground via the fixing means 47. A high frequency voltage is applied. When a high frequency voltage is applied to the coil 32, an eddy current is generated in a portion 36 facing the coil 32 in the inter-member portion 33 of the first steel wire 14 due to the magnetic flux generated in the coil 32, and the portion 36 generates heat. It becomes hot. In the first steel wire 14, the portion 36 facing the coil 32 in the inter-member portion 33 in a tension state generates heat at a high temperature, and the portion 36 is broken by the tension acting on the portion 36, so that the first steel wire 14 Is separated from the second support member 17. When the first steel wire 14 is cut, the inter-member portion 33 of the steel wire 14 is detached from the second support member 17, the tension state of the portion 33 is released, and the first and second pile members 11 by the steel wire 14 are released. , 12 are released. The soil mortar 42 is not consolidated in the pile material building process and the first pile material pulling process, but the second pile material 12 is suspended by the second steel wire 15. Settling in is prevented.

  After separating the first steel wire 14 from the second support member 17, the end portion 28 of the first pile material 11 is supported by the sling 45 of the crane 44, and the first pile material 11 is pulled up in the vertical direction. When the 1st pile material 11 is pulled up, the edge part 19 of the pile material 11 will space apart from the edge part 20 of the 2nd pile material 12 to the vertical direction upper direction, and between them, between the 1st pile material 11 and the 2nd pile material 12 A region 48 of only the soil mortar 42 in which the pile materials 11 and 12 are not present is formed. The vertical dimension L3 of the region 48 is adjusted by the lifting height of the first pile material 11. The 1st pile material 11 is suspended by the crane 44, and the separation state (dimension L3 of the area | region 48) of the 1st pile material 11 and the 2nd pile material 12 is maintained. After the pile material 11 is pulled up, the end portion 29 of the first steel wire 14 is supported by a sling of another crane (not shown) and the steel wire 14 is pulled upward in the vertical direction. The first steel wire 14 is gradually pulled out from the member 16 while sliding on the first support member 16, is detached from the member 16, and is further pulled out from the excavation mine 41 to the ground. These steel wires 14 are drawn from the excavation pit 41 at the same time.

  FIG. 9 is an explanatory diagram of a second steel wire drawing process for drawing the second steel wire 15, and FIG. 10 is a completed drawing of the shaft temporary wall 43. FIG. 11 is an end view taken along line EE of FIG. When the first pile material pulling process is completed, the soil mortar 42 is then cured for a predetermined period, and the second steel wire 15 is pulled out from the excavation mine 41 (soil mortar 42) (second steel wire pulling process). When the soil mortar 42 is cured, the mortar 42 is consolidated, and the first pile material 11 and the second pile material 12 are fixed to the excavation mine 41 by the mortar 42. In the second steel wire drawing process, after cutting an excess portion of the first pile material 11 exposed on the ground, the end portion 30 exposed on the ground of the second steel wire 15 is supported by a sling of a crane (not shown). However, the steel wire 15 is pulled upward in the vertical direction indicated by the arrow L4 with a crane, and the steel wire 15 is held in a tension state. Note that the second steel wire 15 is fixed via the fixing means 47 when the excess portion of the first pile material 11 is cut.

  Next, a high frequency voltage is applied to the high frequency induction heating coil 35 of the third support member 18 from a high frequency generator. When a high frequency voltage is applied to the coil 35, an eddy current is generated in a portion 37 of the second steel wire 15 facing the coil 35 due to the magnetic flux generated in the coil 35, and the portion 37 generates heat and becomes high temperature. The portion 37 of the second steel wire 15 in the tension state facing the coil 35 generates heat to a high temperature, and the portion 37 is broken by the tension acting on the portion 37, so that the second steel wire 15 becomes the third support member 18. Detached from. When the second steel wire 15 is cut off, the steel wire 15 is detached from the third support member 18 and the tension state of the steel wire 15 is released. The steel wire 15 is gradually pulled up from the excavation mine 41 and pulled out from the excavation mine 41 to the ground. When the 2nd steel wire 15 is pulled out, as shown in FIG. 10, the shaft temporary wall 43 in which the area | region 48 was formed between the 1st and 2nd pile materials 11 and 12 will be constructed | assembled.

  FIG. 12 is a view showing an example of the unit 49 of the shaft temporary wall 43 made by this shaft construction method, and FIG. 13 schematically shows the shield device 50 passing through the region 48 between the pile members 11 and 12. FIG. By repeating each step in the direction intersecting with the traveling direction of the tunnel, as shown in FIG. 12, one unit 49 formed from a plurality of pile members 11, 12, 51 can be made. Furthermore, by making each unit 49 adjacent to the traveling direction of the tunnel, the circular regions 48 surrounded by the pile members 11, 12, 51 can be arranged in the traveling direction of the tunnel. In these units 49, circular regions 48 in which the pile materials 11, 12, 51 are not present are defined. In this shaft construction method, the region 48 can be made circular by adjusting the lifting height of the first pile material 11. In addition, the pile material 51 located in the both sides of the unit 49 is using one, and is not built by the said each process, but is simply built in the excavation mine 41. FIG. In the shaft temporary wall 43 made by this shaft construction method, the region 48 of only the soil mortar 42 in which the pile materials 11 and 12 do not exist is formed between the first pile material 11 and the second pile material 12. In the unit 49, the circular region 48 through which the shield machine 50 can pass as it is can be easily created, and it is not necessary to cut and remove (mirror cut) the pile material for securing the passage region of the shield machine 50. .

  In this shaft construction method, until the soil mortar 42 is cured, the second pile material 12 located below the excavation mine 41 is suspended from the second steel wire 15, and the second pile material 12 is suspended from the second steel wire. 15, the second pile material 12 does not sink the excavation mine 41, and the second pile material 12 can be reliably installed at the position where the excavation mine 41 is built. Further, the separation dimension L3 between the end portion 19 of the first pile material 11 and the end portion 20 of the second pile material 12 can be kept constant, and between the first pile material 11 and the second pile material 12 A circular region 48 through which the shield machine 50 can pass can be created. In the shaft construction method, since the second pile material 12 is supported by the second steel wire 15, the posture of the second pile material 12 can be stabilized, and the pile material 12 moves inadvertently in the excavation mine 41. Rather, the pile material 12 can be installed in a posture in which it is substantially upright at the position where the excavation mine 41 is built. The shaft construction method is easy to position the first pile material 11 and the second pile material 12 connected below the first pile material 11, and can reliably position the second pile material 12 directly below the first pile material 11. .

  In the shaft construction method, the support plate 13 attached to the first pile material 11 supports the first and second pile materials 11 and 12 from the axial direction, and the connection and posture of the pile materials 11 and 12 are the support plate 13. Therefore, when the pile members 11 and 12 are built in the excavation pit 41, the connection of the pile members 11 and 12 is not inadvertently released. It can be reliably installed in a posture that is substantially upright at the built-in position. In the shaft construction method, the first steel wire 14 is disposed at the first corner portion 24 and the fourth corner portion 27 of the first and second pile members 11, 12, and the second steel wire 15 is disposed at the first and second piles. By being arranged at the second corner 25 and the third corner 26 of the materials 11 and 12, the pair of first steel wires 14 is located on the diagonal of the H-shaped rope, and the pair of second steel wires 15 Since it is located on the diagonal line of the H-shaped rope, the force when pulling out the first steel wire 14 and the second steel wire 15 from the excavation mine 41 does not act on the first pile material 11 and the second pile material 12 in a biased manner. Inadvertent shifting of the first and second pile members 11 and 12 at the position where the excavation mine 41 is built can be prevented.

  FIG. 14 is a diagram illustrating another example of the pile material 10B, and FIG. 15 is an explanatory diagram of a pile material building process for building the pile material 10B into the excavation mine 41. FIG. 16 is an explanatory diagram of a first pile material pulling step for pulling up the first pile material 11, and FIG. 17 is an explanatory diagram of a second steel wire pulling step for pulling out the second steel wire 15. In FIG. 14, the axial direction is indicated by an arrow L1, and in FIG. 15, the vertical direction is indicated by an arrow L2. In addition, each end view which shows each end surface of 10 A of pile materials of FIG. 1 can be used as an end view which shows each end surface of this pile material 10B.

  The pile material 10B includes a first pile material 11 and a second pile material 12, a pair of support plates 13 that support the pile materials 11 and 12, a first steel wire 14 and a second steel wire 15, and the steel wires. 14 and 15 are formed from first to third support members 16, 17 and 18. This pile material 10B is different from that of FIG. 1 in that the first pile material 11 is formed of a main pile material 52 and a temporary pile material 53, and the other structure of this pile material 10B is the pile of FIG. Since it is the same as that of the material 10A, description of the other structure in this pile material 10B is abbreviate | omitted by attaching | subjecting the same code | symbol as FIG.

  The first pile material 11 is made of a main pile material 52 and a temporary pile material 53 whose axial length is shorter than that of the main pile material 52. The main pile material 52 and the temporary pile material 53 are arranged in a straight line in the axial direction with their end portions 54 and 55 (opposing end portions) in contact with each other. The pile members 52 and 53 are connected to each other between end portions 54 and 55 through fixing means (not shown). These pile members 52 and 53 are H-shaped ropes having first and second opposing walls 21 and 22 and a connecting wall 23, similarly to that of FIG. 1. The pile material 53 may be a prismatic concrete column. In the pile material 10B, in a state where one end portion 19 (opposing end portion) of the main pile material 52 and one end portion 20 (opposing end portion) of the second pile material 12 are in contact with each other, 52 are arranged in a straight line in the axial direction.

  The procedure for constructing the vertical shaft temporary wall 43 using this pile material 10B is as follows. While filling the excavation pit 41 with the soil mortar 42 (curing filler), the pile material 10B of FIG. 14 is prepared. After those preparations are completed, the pile material 10B is built in the excavation mine 41 (pile material building process). The end of the pile material 10B (the end 56 of the temporary pile material 53) is supported by the sling 45 of the crane 44, and the pile material 10B is vertically raised by the crane 44 and lifted in the air. Move to. In the pile material 10 </ b> B held by the crane 44, the temporary pile material 53 is located above, the main pile material 52 is located below the pile material 53, and the second pile material 12 is located below the pile material 52. . After the pile material 10B is positioned at the upper part of the excavation mine 41, the pile material 10B is gradually built into the excavation mine 41 from its end (the end 46 of the second pile material 12) by the crane 44, as shown in FIG. In this way, most of the pile material 10B is embedded in the excavation mine 41 (soil mortar 42) with the end portion 56 of the temporary pile material 53 exposed to the ground. In the pile material building step, the inter-member portion 33 extending between the first and second support members 16 and 17 of the first steel wire 14 is in a tension state, and the support plate 13 is the first and second pile materials. Since the end portions 19 and 20 of the 11 and 12 are supported, there is no inadvertent displacement between the pile materials 11 and 12, and the connection of the pile materials 11 and 12 is maintained.

  When the pile material building process is finished, the first pile material 11 is then pulled up to a predetermined height in the vertical direction (first pile material pulling process). In the first pile material pulling step, the end portion 30 exposed to the ground of the second steel wire 15 is fixed on the ground via the fixing means 47, and the high frequency induction heating coil 32 of the second support member is fed from the high frequency generator. Apply high frequency voltage. In the first steel wire 14, the portion 36 facing the coil 32 in the inter-member portion 33 in a tension state generates heat at a high temperature, and the portion 36 is broken by the tension acting on the portion 36, so that the first steel wire 14 Is separated from the second support member 17. When the first steel wire 14 is cut, the inter-member portion 33 of the steel wire 14 is detached from the second support member 17, the tension state of the portion 33 is released, and the first and second pile members 11 by the steel wire 14 are released. , 12 are released. Since the second pile material 12 is suspended by the second steel wire 15, settling of the pile material 15 in the excavation mine 41 is prevented.

  After the first steel wire 14 is separated from the second support member 17, the end 56 of the temporary pile material 53 is supported by the sling 45 of the crane 44, the temporary pile material 53 is pulled up in the vertical direction, and the entire pile material 53 is removed. While pulling up from the excavation pit 41 to the ground, the end 55 of the main pile material 52 is exposed to the ground. The exposed dimension of the end portion 55 of the main pile material 52 is the same as the exposed dimension of the end portion 56 of the temporary pile material 53 at the end of the erection process. When the temporary pile material 53 is pulled up to the ground, the end portion 19 of the first pile material 11 is separated vertically upward from the end portion 20 of the second pile material 12, and the first pile material 11 and the second pile material 12 are separated from each other. A region 48 of only the soil mortar 42 in which the pile materials 11 and 12 are not present is formed therebetween. The vertical dimension L3 of the region 48 is the same as that of the raised temporary pile material 53. After pulling up the temporary pile material 53, the first pile material 11 is suspended by the crane 44, and the separated state (the dimension L3 of the region 48) between the first pile material 11 and the second pile material 12 is maintained. After the pile material 11 is pulled up, the end portion 29 of the first steel wire 14 is supported by a sling of another crane (not shown) and the steel wire 14 is pulled upward in the vertical direction. The first steel wire 14 is gradually pulled out of the member 17 while sliding on the first support member 17, is detached from the member 17, and is further pulled out from the excavation mine 41 to the ground. After the steel wire 14 is pulled out, the fixing of the main pile material 52 and the temporary pile material 53 is released, and the temporary pile material 53 is removed from the main pile material 52.

  When the first pile material pulling process is completed, the soil mortar 42 is then cured for a predetermined period, and the second steel wire 15 is pulled out from the excavation mine 41 (second steel wire pulling process). When the soil mortar 42 is cured, the mortar 42 is consolidated, and the first pile material 11 (main pile material 52) and the second pile material 12 are fixed to the excavation mine 41 by the mortar 42. In the second steel wire drawing step, the end portion 30 exposed on the ground of the second steel wire 15 is supported by a sling of a crane (not shown), and the steel wire 15 is pulled upward in the vertical direction indicated by the arrow L4 with the crane. The steel wire 15 is held in a tension state. Next, a high frequency voltage is applied to the high frequency induction heating coil 35 of the third support member 18 from a high frequency generator. When a high frequency voltage is applied to the coil 35, the portion 37 of the second steel wire 15 that is in tension is opposed to the coil 35 and heats up to a high temperature, and the portion 37 is broken by the tension acting on the portion 37. The steel wire 15 is separated from the third support member 18. When the second steel wire 15 is cut off, the steel wire 15 is detached from the third support member 18 and the tension state of the steel wire 15 is released. The steel wire 15 is gradually pulled up from the excavation mine 41 and pulled out from the excavation mine 41 to the ground. When the 2nd steel wire 15 is pulled out, the shaft temporary wall 43 in which the area | region 48 was formed between the 1st and 2nd pile materials 11 and 12 will be constructed | assembled (refer FIG. 10).

  By repeating each step in the direction intersecting with the traveling direction of the tunnel, one unit 49 formed from a plurality of pile members 11, 12, 51 can be made (see FIG. 12). Furthermore, by making each unit 49 adjacent to the traveling direction of the tunnel, the circular regions 48 surrounded by the pile members 11, 12, 51 can be arranged in the traveling direction of the tunnel. The shaft construction method using the pile material 10B has the following effects in addition to the effects of the shaft construction method using the pile material 10A of FIG. By pulling up the temporary pile material 53 to the ground, the separation dimension L3 between the end portions 19 and 20 in the first and second pile materials 11 and 12 is determined, and the first pile material 11 is pulled up like the pile material 10A in FIG. It is not necessary to adjust the separation dimension L3 between the end portions 19 and 20 of the first and second pile members 11 and 12 while adjusting the height, and the first and second pile members can be obtained by using the temporary pile member 53. It is possible to accurately adjust the separation dimension L3 of the end portions 19 and 20 at 11 and 12. In this shaft construction method, the separation dimension L3 between the end portions 19 and 20 in the first and second pile members 11 and 12 can be easily changed by changing the length dimension of the temporary pile member 53. A region 48 having a certain shape where the pile materials 11 and 12 do not exist can be reliably formed between the pile material 11 and the second pile material 12.

The figure which shows an example of a pile material. FIG. 2 is an end view taken along line AA in FIG. 1. FIG. 3 is an end view taken along line BB in FIG. 1. The CC sectional view taken on the line of FIG. The figure which shows an example of a 2nd and 3rd support member. Explanatory drawing of the pile material construction process which builds a pile material in an excavation mine. Explanatory drawing of the 1st raising process which raises a 1st pile material. The DD line end view of FIG. Explanatory drawing of the 2nd steel wire drawing process which draws out the 2nd steel wire. The completed drawing of the shaft. The EE line | wire end view of FIG. The figure which shows an example of the unit of the shaft made by the shaft construction method. The figure which shows typically the shield apparatus which passes along the area | region between pile materials. The figure which shows another example of a pile material. Explanatory drawing of the pile material construction process which builds a pile material in an excavation mine. Explanatory drawing of the 1st pile material raising process which raises a 1st pile material. Explanatory drawing of the 2nd steel wire drawing process which draws out the 2nd steel wire.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10A Pile material 10B Pile material 11 1st pile material 12 2nd pile material 13 Support plate 14 1st steel wire 15 2nd steel wire 16 1st support member 17 2nd support member 18 3rd support member 19 End (opposite end) Part)
20 end (opposite end)
21 First opposing wall 22 Second opposing wall 23 Connecting wall 24 First corner 25 Second corner 26 Third corner 27 Fourth corner 31 Fixed portion 32 High frequency induction heating coil 33 Inter-member portion 34 Fixed portion 35 High frequency Induction heating coil 41 Drilling pit 42 Soil mortar (curing filler)
43 Temporary tunnel wall 48 Area 52 Main pile material 53 Temporary pile material

Claims (5)

In the shaft construction method of excavating the ground to form a drilling mine extending in the vertical direction, filling the excavation mine with a curing filler, and building a vertical shaft by building a pile material in the vertical direction,
The pile material has first and second pile materials arranged in the axial direction and having opposed end portions that contact each other, and the piles extending from the non-opposed end portion of the first pile material in the axial direction. A first steel wire that reaches a predetermined position of the second pile material beyond the opposed end portion of the material, and extends in the axial direction from the non-opposed end portion of the first pile material to the opposed end portions of the pile material A second steel wire that reaches a predetermined position of the second pile material over the first pile, a first support member that is attached to the first pile material and slidably supports the first steel wire, and the second A second support member attached to a pile material and capable of supporting the first steel wire and capable of separating the first steel wire; and a second support member attached to the second pile material and capable of supporting the second steel wire. Formed from a third support member capable of separating two steel wires,
In the state where the first steel wire is tensioned between the first support member and the second support member, a pile material erection step of erected the first and second pile materials in the excavation mine, While supporting the second steel wire on the ground, the first steel wire is separated from the second support member, the first steel wire is pulled out from the excavation mine, and the first pile material is pulled up in the vertical direction to be first. The first pile material pulling up step for separating the opposite ends of the pile material and the second pile material in the vertical direction by a predetermined dimension, and after curing the filler, the second steel wire is separated from the third support member. And a second steel wire drawing step of drawing the second steel wire from the excavation pit.   In the H-shaped rope, the first and second pile members have first and second opposing walls extending in the axial direction and spaced apart from each other, and a connecting wall extending between the opposing walls and extending in the axial direction. And the first corner and the second corner formed at the intersection of the first opposing wall and the connecting wall, and the first corner formed at the intersection of the second opposing wall and the connecting wall. A third corner portion facing the second corner portion and a fourth corner portion facing the second corner portion, wherein the first steel wire is disposed at the first corner portion and the fourth corner portion, and the second corner portion. The shaft construction method of Claim 1 with which the steel wire is arrange | positioned at the said 2nd corner | angular part and the said 3rd corner | angular part.   The first pile material is formed from a main pile material and a temporary pile material that have opposing end portions that contact each other and are arranged in the axial direction. In the first pile material pulling step, the length dimension of the temporary pile material The said temporary pile material is removed from the said main pile material, after pulling up the said temporary pile material to the ground so that it may correspond to the separation dimension of the opposing edge parts in a 1st and 2nd pile material. 2. The shaft construction method according to 2.   The pile material includes a support plate extending in the axial direction across opposing ends of the first pile material and the second pile material, and the support plate includes the first pile material and the second pile material. The shaft construction method according to any one of claims 1 to 3, wherein the pile material is attached to either one of the two and supports the pile material from the axial direction.   The second support member and the third support member are provided with a high-frequency induction heating coil, and the high-frequency induction heating coil generates eddy currents in the first and second steel wires so that the steel wires themselves are The shaft construction method according to any one of claims 1 to 4, wherein the steel wires are separated from the second and third support members by heat-breaking.

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