JP2004332202A - Method for constructing shaft by using liner plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To construct a shaft having a large depth without increasing a cost as a method for constructing the shaft by using a liner plate. <P>SOLUTION: The shaft H by a well curb 1 having a specified depth is built by repeating the excavation of a bottom-hole corresponding section D and press-in by a press-in device 7, while coupling and extending ring-shaped liner units 4A, 4B, 4C or the like in which the corrugated liner plates are assembled on preceding liner units 3 as unit elements. Rod element pieces 5a, 5a or the like are coupled extended similarly when the liner units 4A, 4B, 4C or the like are coupled extended and press-un rods 5 are manufactured while the liner units 4A, 4B, 4C or the like and the rods 5 are connected through reinforcing rings 6 and a load by the press-in device 7 is transmitted to a cutting-edge ring 2 at a front end through the rods 5. The rods 5 are disassembled into the rod element pieces 5a, 5a or the like after the construction of the shaft H and removed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method of constructing a shaft (penetration) such as a sewer and a common ditch on the ground, and more specifically, a liner plate formed of corrugated steel plate as a unit element, and the liner plate is circumferentially and vertically moved. The present invention relates to a method of constructing a shaft with a plurality of wells connected in a direction to form a well, and using the well as a retaining wall (or a water blocking wall).
[0002]
[Prior art]
As a method of constructing a shaft using such a liner plate, a method described in Patent Documents 1 and 2 has been proposed in addition to a method called a so-called deep foundation method.
[0003]
That is, in the deep foundation method, assuming that a liner plate previously formed into an arc shape having a predetermined curvature with a corrugated steel plate is used as a retaining wall, excavation is performed while supporting the hole wall with the retaining wall, and the liner plate is removed. While a vertical shaft having a predetermined depth is constructed while the earth retaining wall body is formed to extend downward by successively adding, the techniques described in Patent Literatures 1 and 2 use a liner plate in advance to form a ring. And press-fitting the liner unit assembled into the liner unit into the ground, and repeatedly adding and pressing the liner unit upward to the liner unit while mechanically excavating a portion corresponding to the bottom of the shaft, thereby constructing a shaft having a predetermined depth.
[0004]
[Patent Document 1]
JP-A-6-49592 (FIGS. 1 and 6)
[0005]
[Patent Document 2]
JP-A-10-169360 (FIGS. 12 to 16)
[0006]
[Problems to be solved by the invention]
According to the technique described in Patent Document 1, a tubular shape assembled by connecting a plurality of liner plates in consideration of the fact that the rigidity of a liner plate formed of a corrugated steel plate is not sufficient and the propulsion resistance at the time of press-fitting is large. Since it is premised that the outer periphery of the body is covered with another thin steel plate, a steel plate for covering is indispensable separately from the liner plate, and a significant cost increase is inevitable.
[0007]
Further, according to the technique described in Patent Literature 2, since a plurality of liner plates are connected to each other to directly apply a press-fit load to a cylindrical body (liner unit) assembled and press-fit into the ground, Since the plate itself is formed of corrugated steel plate, not only the propulsion resistance at the time of press-fitting is large, but also its rigidity is not enough, so that the liner plate is liable to buckle at the time of press-fitting. Has its own limitations.
[0008]
The present invention has been made in view of such a problem, and a ring-shaped liner unit is formed by connecting a plurality of liner plates at least in a circumferential direction with a liner plate formed of a corrugated steel sheet as a unit element. Provide a construction method that enables the construction of a shaft with a larger depth without incurring cost increase, assuming that the excavation of the bottom of the liner unit, the press-fitting of the liner unit, and the addition of the liner unit are repeated. It is assumed that.
[0009]
[Means for Solving the Problems]
According to the first aspect of the present invention, a well is formed by connecting a plurality of liners in a circumferential direction and a vertical direction with a liner plate formed of a corrugated steel plate as a unit element, and the well is formed as a retaining wall. It is assumed that the method is to build a shaft. Then, a ring-shaped liner unit functioning as a part of a well is assembled by connecting a plurality of liner plates at least in the circumferential direction, while a cutting edge ring is connected to a lower end of the liner unit, and a cutting edge is connected. A press-fit rod that extends upward along the inner peripheral surface of the liner unit is detachably erected on the ring, and while excavating a pit-bottom equivalent part in the liner unit installed on the ground with the cutting edge ring as a ground part, The liner unit is pressed into the ground by applying a press-fit load to the blade ring by a press-fitting device using the press-fit rod as a load input unit, and the press-fit rod is removed after a well tube having a predetermined depth is constructed with the liner unit. It is characterized by doing.
[0010]
The reaction force at the time of press-fitting of the liner unit is to be borne by, for example, driving a well-known ground anchor deep underground near the shaft. Further, as the press-fit rod, a rod having a higher strength than the liner plate is used because the press-fit rod directly transmits the load. For example, an H-section steel, a solid round bar-like one, a pipe-like one, or the like is used. The best one is selected and used as appropriate.
[0011]
The liner plate used here is, for example, a substantially rectangular plate formed by forming a thin corrugated steel plate so that the vertical cross section has a wavy shape. Therefore, a flange portion is formed, and a plurality of bolt holes are formed in the flange portion at the same time. For example, a liner plate for constructing a circular shaft is formed as a circular arc having a size equal to n equal to the circumference of the shaft to be constructed, and these liner plates are arranged in the circumferential direction and the vertical direction. To form a cylindrical well. On the other hand, for example, when constructing a so-called oval (oval) shaft, a liner plate having a predetermined curvature and a flat liner plate having no curvature are used in combination as described above.
[0012]
Depending on the strength required for each liner plate, a liner plate having a horizontal cross section may be used instead of a liner plate having a vertical cross section.
[0013]
As a more specific method of the construction procedure, as described in claim 2, the liner unit of the next stage is connected to the liner unit pressed into the ground so as to be stacked, and added to the liner unit. By repeating the extension of the pit, the excavation of the portion corresponding to the pit bottom, and the press-fitting using the press-fitting rod as the load input portion, it is possible to construct a shaft with a greater depth.
[0014]
In this case, a plurality of press-fitting rods are erected along the inner peripheral surface of the liner unit, and each press-fitting rod is a rod piece having an integral multiple of the height dimension of the liner plate. In order to improve workability, it is desirable to extend the rod piece each time the liner unit is extended or once every n times of the liner unit when the liner unit is extended.
[0015]
In addition, as described in claim 4, a reinforcing ring is interposed in all or a part of the connecting portion between the liner units, and at the time of adding a rod piece that functions as a part of the press-fit rod. The rod piece is detachably connected to the reinforcing ring. By doing so, the effect of preventing the press-fit rod from oscillating and the effect of maintaining straightness are exhibited, and each liner unit can follow the movement of the press-fit rod.
[0016]
As a more specific structure of the lowermost liner unit, as described in claim 5, a cutting edge ring is connected to lower ends of a plurality of liner plates forming the liner unit, and then the inside of the liner plate is formed. By covering the peripheral surface with concrete, a plurality of liner plates, a cutting edge ring, and a concrete layer are integrated. By doing so, the liner unit functioning as the lowermost preceding cylindrical body can be provided with necessary and sufficient strength.
[0017]
Therefore, in at least the first aspect of the invention, the liner unit is pressed into the ground by being pulled by the cutting edge ring, so that the liner unit itself does not directly receive the press-fit load. Therefore, buckling and the like of the liner unit and the liner plate forming the liner unit are prevented beforehand, and a shaft with a greater depth can be constructed.
[0018]
Once the shaft of the predetermined depth has been constructed, the press-in rod is removed after the construction of the shaft of the predetermined depth since the press-in rod loses its original function. By doing so, the press-fit rod can be used repeatedly, and the construction cost can be greatly reduced. Moreover, by removing the press-fit rod, there is no longer a projecting part in the shaft, and the effective area thereof can be enlarged.
[0019]
The invention according to claim 6 is based on the premise of the method for constructing a shaft according to any one of claims 1 to 5, and preliminarily constructs a sub shaft larger than the shaft to be constructed, and receives a reaction force on the sub shaft. The press-fitting device is fixedly supported via a member, and the reaction force accompanying the press-fitting of the liner plate is supported on the side of the vertical shaft.
[0020]
Therefore, according to the invention described in claim 6, construction of a ground anchor or the like for supporting the reaction force as described above is unnecessary.
[0021]
According to a seventh aspect of the present invention, on the premise of the method for constructing a shaft according to any one of the first to sixth aspects, a portion corresponding to a pit bottom in the liner unit is excavated while supplying water to the liner unit. It is characterized by.
[0022]
When constructing a shaft on soft ground, the water level inside the liner unit, which will function as a part of a well, is lowered by sequentially excavating the bottom of the liner, and the difference between the water level of the surrounding ground This can cause the liner unit to deform inward. Therefore, as in the invention according to claim 7, while there is no large difference between the water level of the surrounding ground and the water level inside the liner unit during construction, the water inside the liner unit is replenished while the water is being supplied to the liner unit. Excavation of a portion corresponding to the bottom of the pit can prevent deformation of the liner unit during construction.
[0023]
【The invention's effect】
According to the first and second aspects of the present invention, while the method of constructing a shaft is based on the premise that the liner plate is pressed into the ground, the press-fit load is directly transmitted to the cutting edge ring through the press-fit rod. Then, since the press-fit load was not directly applied to each liner plate that constitutes the liner unit, it is possible to construct a shaft with a greater depth without reinforcing the liner unit, and after the construction Since the removed press-fit rod can be used repeatedly, the construction cost can be further reduced.
[0024]
According to the invention as set forth in claim 3, since the construction is performed while also adding the press-fit rod in parallel with the addition of the liner unit, for example, compared with the case where the press-fit rod according to the depth of the shaft is suddenly erected. This has the effect of improving workability during construction.
[0025]
According to the invention as set forth in claim 4, the reinforcing ring is interposed at the connecting portion between the liner units, and the rod piece functioning as a part of the press-fitting rod is detachably connected to the reinforcing ring. Even if the depth of the shaft is increased, the press-fit rod can be prevented from swaying and maintain straightness, so that buckling of the press-fit rod can be prevented beforehand, contributing to further improvement in workability. There is an advantage that the press-fitting displacement of the rod can be reliably transmitted to the liner units of each stage.
[0026]
According to the invention as set forth in claim 5, since the lowermost liner unit with the cutting edge ring is substantially coated in advance with a concrete layer, the strength is dramatically improved, and the lowermost liner unit is provided. Buckling, etc., can be prevented beforehand.
[0027]
According to the invention as set forth in claim 6, since the reaction force due to the press-fitting of the liner plate is supported on the side of the secondary shaft larger than the shaft to be constructed, for example, when the ground anchor is driven to support the press-in reaction force In comparison, there is an advantage that the construction cost can be significantly reduced.
[0028]
According to the invention as set forth in claim 7, since a portion corresponding to the pit bottom in the liner unit is excavated while supplying water to the liner unit, deformation of the liner plate or the like due to a difference in water level in the surrounding ground can be prevented. There is an advantage that can be prevented.
[0029]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows a preferred embodiment of the present invention, in which a circular shaft is being constructed.
[0030]
As is apparent from the figure, the lowermost ring-shaped leading liner unit 3 having the cutting edge ring 2 is a leading cylindrical body, and an n-stage ring-shaped body on which a part of the well 1 is formed. Are stacked and connected to each other, while a plurality of (for example, four) press-fitting rods 5 are set up on the lowermost preceding liner unit 3 along the inner peripheral surface of the well 1. The press-fit rod 5 is set so as to protrude by a predetermined amount from the top liner unit 4F.
[0031]
Here, as the press-fit rod 5, for example, an H-shaped steel or a round pipe having excellent buckling strength is used as described later, and the press-fit rod 5 has a plurality of rod pieces 5 a in the longitudinal direction. , 5a, etc., and in parallel with the successive addition of the liner units 4A, 4B, 4C,. It is.
[0032]
In this embodiment, as shown in FIG. 1, once every two liner units 4A, 4B, 4C... Are added, the liner units (liner plates) 4A, 4B, 4C. For example, a high-strength reinforcing ring 6 formed of, for example, an H-shaped steel is interposed, and the rod element 5a is detachably connected to the reinforcing ring 6. Of course, a reinforcing ring 6 may be interposed each time the liner units 4A, 4B, 4C... Are added, and the rod pieces 5a, 5a. , The anti-sway effect and straightness of the press-fit rod 5 composed of the plurality of rod pieces 5a, 5a,.
[0033]
On the other hand, the press-fitting device 7 is installed on the ground G side at the position where the shaft H is to be constructed. The press-fitting device 7 includes a plurality of hydraulic jacks 9 having a ground anchor 8 previously driven deep into the ground as a reaction force, and a ring-shaped or double-girder-shaped lifting base 10 driven up and down by the hydraulic jacks 9. The protection ring 11 is interposed between the lifting base 10 and the above-described uppermost liner unit 4F.
[0034]
Then, as shown in FIG. 13, while excavating a portion D corresponding to the pit bottom inside the lowermost preceding liner unit 3 by the clamshell 25 of the bucket type excavator, the clamshell 25 is constituted by a laminate of liner units 4A, 4B, 4C,. The well tube 1 is pressed into the ground, and the above-described excavation and press-fitting with the addition of the liner units 4A, 4B, 4C... And the rod pieces 5a, 5a. With 1 the shaft H is constructed.
[0035]
In this case, if the ground on which the shaft H is to be constructed is, for example, soft ground, the excavation and press-fitting of the liner units 4A, 4B, 4C... 4A, 4B, 4C (the well tube 1 under construction) sometimes has a large difference in water level. For example, when the water level inside the liner units 4A, 4B, 4C... Becomes significantly lower than the water level of the surrounding ground due to the repetition of the above excavation, some of the liner units 4A, 4B, 4C. It may be deformed inward. Therefore, during the construction of the shaft H, the inside of the liner units 4A, 4B, 4C,... Is appropriately replenished with water so that the above-mentioned water level difference does not occur.
[0036]
If the shaft H having the well 1 press-fitted to the predetermined depth and the well 1 as the earth retaining wall is constructed, the bottom concrete is poured into the corresponding portion D of the well as described later with the removal of the press-in device 7. Finally, the press-fit rod 5 is completely removed from the shaft H while disassembling the plurality of rod pieces 5a. While the construction of the shaft H is completed as described above, the removed rod pieces 5a, 5a,... Can be used repeatedly.
[0037]
Each of the above-mentioned liner units 4A, 4B, 4C,... Has, as a unit element, a liner plate 12 as shown in FIG. , 12,... Are connected with bolts and nuts, respectively. As shown in FIG. 2, the liner plate 12 has a substantially rectangular liner plate main body 13 formed of, for example, a thin sheet of corrugated steel sheet and having a vertical cross section having a wavy shape as a main element, and has a mating side on four sides thereof. Are formed in order to connect with the liner plate 12. At the same time, a plurality of bolt holes 15, 15,... Are formed in the flange portions 14, 14,. The liner plates 12, 12... For constructing the circular shaft H as shown in FIG. 1 have a size, for example, one sixth of the circumference of the shaft H to be constructed, that is, an arc shape having a predetermined curvature. And the height h is unified to, for example, 50 cm.
[0038]
The lowermost preceding liner unit 3, as shown in FIG. 4, connects the blade ring 2 having a substantially wedge-shaped cross section to the lower ends of the liner plates 12, 12,... And a plurality of liner plates 12, 12,... Forming the preceding liner unit 3 and the cutting edge ring 2, The concrete layer 16 is integrally joined, and at the same time, as described above, the strength of the preceding liner unit 3 functioning as a preceding tubular body at the time of being pressed into the ground is improved.
[0039]
Each of the rod pieces 5a, 5a... Forming the press-fit rod 5 is provided with end plates 21 at upper and lower ends of a main body 20 obtained by cutting an H-shaped steel into a predetermined length as shown in FIGS. Are fixed by welding, and the height is set to the same height as each of the liner units 4A, 4B, 4C..., That is, 1 m which is twice the height h of the liner plate 12. Are formed in the flange portions 22 of the rod pieces 5a, 5a,..., And bolt holes 23 for connecting the rod pieces 5a, 5a are formed in the end plate 21. Are formed respectively.
[0040]
The drawings following FIG. 7 show details of the construction procedure of the shaft H shown in FIG.
[0041]
First, as shown in FIG. 7, the ground anchor 8 is driven deep into the ground near the position where the shaft H is to be constructed, while the lowermost preceding liner unit shown in FIG. 3 is installed horizontally with the cutting edge ring 2 as a ground portion.
[0042]
Subsequently, as shown in FIGS. 8 and 10, a plurality of rod pieces 5 a, 5 a, which constitute a part of the press-fit rod 5, are seated on the concrete layer 16 of the preceding liner unit 3 at an equal pitch. Are connected to the leading liner unit 3 via the reinforcing ring 6 and fixed. By doing so, the rod piece 5a projects above the preceding liner unit 3.
[0043]
More specifically, in the present embodiment, the connection between the respective liner plates 12, 12 which constitute the preceding liner unit 3 or the liner units 4A, 4B, 4C... Is as shown in FIG. Is basically connected with a bolt and nuts 18 and 19 with a water-swellable rubber 17 as a water-stopping rubber interposed therebetween. At this point, as shown in FIG. 9B, the reinforcing ring 6 made of H-section steel is connected to the upper end of the preceding liner unit 3 by bolts and nuts 18 and 19, and at the same time, as shown in FIG. As shown in FIG. 11, the lowermost rod element 5a is detachably connected to the reinforcing ring 6 by bolts and nuts 18 and 19. In this case, the lower end of the rod piece 5a to be seated on the concrete layer 16 is also connected to the concrete layer 16 with the same bolt and nut connection as described above, for example, by embedding bolts in advance in the concrete layer 16 side. You may make it.
[0044]
When the rod piece 5a functioning as a part of the press-fit rod 5 is thus erected, the press-fitting device 7 is set at a proper position as shown in FIG. The protective ring 11 is interposed between them. Then, as shown in FIG. 13, the hydraulic jack 9 of the press-fitting device 7 is operated while excavating the portion D corresponding to the pit bottom inside the preceding liner unit 3 with the clam shell 25 of the bucket type excavator, and 5a is used as a load input section to apply a press-fit load and press-fit the preceding liner unit 3 into the ground. In this case, as described above, when the ground on which the shaft H is to be constructed is soft ground and a large water level difference occurs between the outside and the inside of the preceding liner unit 3 due to the excavation by the clamshell 25, the water level difference Excavation shall be performed while replenishing water inside the preceding liner unit 3 so as to minimize as much as possible.
[0045]
When the leading liner unit 3 has been pressed into the ground by a predetermined amount, the press-in device 7 is once removed as shown in FIG. 14, and subsequently, a new liner unit 4A is inserted as shown in FIGS. While adding to the above-mentioned reinforcing ring 6, new rod segments 5a, 5a... Are also added to the respective rod segments 5a, 5a. As is clear from FIGS. 16 and 17, the rod pieces 5a made of H-shaped steel are detachably connected to each other by bolts and nuts 18 and 19.
[0046]
When the refilling work of the liner unit 4A and the rod piece 5a is thus completed, the press-fitting device 7 is set to the normal position again as shown in FIG. 18, and excavation by the clam shell 25 similar to FIG. As shown in FIG. 19, the press-in into the ground by the press-in device 7 is repeated.
[0047]
When excavation and press-fitting by the clamshell 25 are completed, the press-fitting device 7 is once removed as shown in FIG. 20, and then the third-stage liner unit 4B and rod pieces 5a, 5a as shown in FIG. … Is added. That is, the third-stage liner unit 4B is added on the second-stage liner unit 4A in the same manner as in FIG. 9A, and the reinforcing ring is provided on the upper portion of the added liner unit 4B in the same manner as in FIG. , And the third-stage rod pieces 5a, 5a... Are connected to the second-stage rod pieces 5a, 5a. Then, the third-stage rod piece 5a added in the same manner as in FIG. 10 is connected to the reinforcing ring 6 by bolts and nuts 18 and 19.
[0048]
Thereafter, as shown in FIG. 22, the press-fitting device 7 is set to the normal position again, and excavation by the clamshell 25 and press-fitting by the press-fitting device 7 shown in FIG. 19 to 22 are repeated by the number of liner units 4C, 4F... And rod pieces 5a, 5a.
[0049]
Here, when press-fitting the liner units 4A, 4B,..., The press-fit load by the press-fitting device 7 via the press-fit rod 5 composed of the plurality of rod pieces 5a, 5a. Are transmitted to the respective liner units 4A, 4B, 4C,... Via the reinforcing ring 6, so that the liner units 4A, 4B, 4C,. .. Are drawn down by the leading liner unit 3 and the press-fitting rods 5, 5,..., Thereby forming the respective liner units 4A, 4B, 4C, and finally the liner units 4A, 4B, 4C,. However, since the press-fitting load is not directly applied to the liner plates 12, 12. Over plates 12, 12 ... are without such deformation, Izutsu 1 Hiiite the necessary depth while using poor liner plates 12, 12 ... of the stiffness can construct a pit H.
[0050]
As shown in FIG. 23, if the well pipe 1 having a predetermined depth is constructed by adding and press-fitting the liner units 4A, 4B, 4C... For the required number of stages (in this example, six stages except the leading liner unit 3), The press-fitting device 7 is removed to bring it into the state shown in FIG. In this state, concrete is poured underwater to construct the bottom slab concrete 26 at the bottom of the pit. When the bottom slab concrete 26 is completely solidified, the inside of the well 1 is drained, and as shown in FIG. 25, the rod pieces 5a, 5a,. Remove it. As described above, a predetermined shaft H having the well 1 having the liner plates 12, 12,... As a unit element and having the well 1 as a retaining wall is constructed.
[0051]
In this case, since the press-fit rod 5 is completely removed from the shaft H, the effective space of the shaft H can be as large as possible. Further, the rod pieces 5a, 5a,... Of the removed press-fit rod 5 can be used repeatedly.
[0052]
FIG. 26 shows the mutual relationship between the cutting edge ring 2 of the preceding liner unit 3 and the press-fit rod 5 and the reinforcing rings 6 connecting the respective liner units 4A, 4B, 4C to the press-fit rod 5 in the above embodiment. FIG. 27 and FIG. 28 show a modification of FIG. 26, respectively. As is clear from FIGS. 27 and 28, the oval shaft H is formed by using the oval type as the liner units 4A, 4B, 4C... And the reinforcing ring 6A in addition to the leading liner unit 3 and its cutting ring 2A. However, similarly, by using a rectangular one as the liner units 4A, 4B, 4C... And the reinforcing ring 6B in addition to the leading liner unit 3 and its cutting edge ring 2B, the rectangular shaft H can be constructed.
[0053]
FIGS. 29 and 30 show a second embodiment of the present invention, in which the structure for receiving the press-fitting reaction force by the press-fitting device is different from that of the first embodiment shown in FIG. Note that parts common to those in FIG. 1 are denoted by the same reference numerals.
[0054]
As shown in FIGS. 29 and 30, a sub shaft 30 slightly larger than the vertical shaft H is formed outside the position where the shaft H is to be constructed, and the outer diameter of the sub shaft 30 gradually decreases on the inner peripheral surface of the sub shaft 30. The reaction force receiving structure 32 in which the channel-shaped rings 31, 31... Further, a pair of spar members 33 are arranged in a bridge manner on any of the rings 31 forming the reaction force receiving structure 32, and the spar members 33 support a pair of hydraulic jacks 34, respectively. There is. Then, a protection ring 36 is interposed between the piston of each hydraulic jack 34 and the press-fit rod 5, and a press-fit load is applied to the press-fit rod 5 with this.
[0055]
According to this embodiment, the press-fitting reaction force by the press-fitting device 35 is borne by the mass of the earth mass on the back side of the reaction force receiving structure 32 via the girder member 33 and the reaction force receiving structure 32. There is no need to drive the ground anchor 8 as in the first embodiment shown in FIG. This makes it possible to reduce the construction cost required for the reaction force receiving structure.
[0056]
Here, instead of the reaction force receiving structure 32 mainly composed of the plurality of rings 31, 31 as described above, a plurality of steels are arranged so as to surround the position where the shaft H is to be constructed as shown in FIGS. The sheet pile 37 and the like may be pressed into the ground to form a reaction force receiving structure 38, and the beam member 33 may be supported by the reaction force receiving structure 38 via a support 39 made of H-shaped steel or the like. In this case, the press-fitting reaction force of the press-fitting device 35 is borne by the pull-out resistance of the reaction force receiving structure 38 made of the steel sheet pile 37 or the like. In this case, the same effect as above can be obtained.
[Brief description of the drawings]
FIG. 1 is a process explanatory view showing a state in which a shaft is being constructed as a first preferred embodiment of the present invention.
2A is a perspective view of a liner plate used for constructing the shaft of FIG. 1, and FIG. 2B is an exploded view of the liner plate shown in FIG.
3 is a perspective view of a liner unit assembled using the liner plate shown in FIG. 2 as a unit element.
FIG. 4 is an enlarged explanatory view of a part a in FIG. 1;
5A is a front explanatory view of a rod element used as a unit element of the press-fit rod shown in FIG. 1, and FIG. 5B is a left side view of FIG.
FIG. 6 is a plan view of FIG.
FIG. 7 is an explanatory view showing an initial step of the construction procedure shown in FIG. 1;
FIG. 8 is an explanatory diagram of the construction procedure following FIG. 7;
FIGS. 9A and 9B are enlarged cross-sectional views of a connection portion between liner units in both FIGS.
FIG. 10 is an enlarged explanatory view of a main part of FIG. 8;
FIG. 11 is a left side view of FIG. 10;
FIG. 12 is an explanatory diagram of the construction procedure following FIG. 8;
FIG. 13 is an explanatory diagram of the construction procedure following FIG. 12;
FIG. 14 is an explanatory diagram of the construction procedure following FIG. 13;
FIG. 15 is an explanatory diagram of the construction procedure following FIG. 14;
FIG. 16 is an enlarged explanatory view of a main part of FIG. 15;
FIG. 17 is a left side view of FIG. 16;
FIG. 18 is an explanatory diagram of the construction procedure following FIG. 15;
FIG. 19 is an explanatory diagram of the construction procedure following FIG. 18;
FIG. 20 is an explanatory diagram of the construction procedure following FIG. 19;
FIG. 21 is an explanatory diagram of the construction procedure following FIG. 20;
FIG. 22 is an explanatory diagram of the construction procedure following FIG. 21;
FIG. 23 is an explanatory diagram of the construction procedure following FIG. 22;
FIG. 24 is an explanatory diagram of the construction procedure following FIG. 23;
FIG. 25 is an explanatory diagram of the construction procedure following FIG. 24;
FIG. 26 is a schematic explanatory view showing the interrelationship between the blade ring, the press-fit rod, and the reinforcing ring in FIG. 1;
FIG. 27 is a schematic explanatory view showing a modification of FIG. 26;
FIG. 28 is a schematic explanatory view showing another modification of FIG. 26;
FIG. 29 is a process explanatory view showing the second embodiment of the present invention.
FIG. 30 is an explanatory plan view of FIG. 29;
FIG. 31 is a process explanatory view showing a modification of FIG. 29;
FIG. 32 is an explanatory plan view of FIG. 31;
[Explanation of symbols]
1 ... Izutsu
2 ... Cutting ring
3. Leading liner unit
4A-4E ... Liner unit
5 ... Press-fit rod
5a… Rod element
6 ... Reinforcing ring
7. Press-in device
12 ... Liner plate
16 ... Concrete layer
30 ... side shaft
32, 38 ... reaction force receiving structure (reaction force receiving member)
D: Underground equivalent
H ... shaft

Claims (7)

A method of constructing a shaft using a liner plate formed of a corrugated steel plate as a unit element and connecting the liner plates in a circumferential direction and a plurality of the liners in a vertical direction to form a well, and using the well as a retaining wall body,
A ring-shaped liner unit functioning as a part of a well is assembled by connecting at least a plurality of liner plates in the circumferential direction, while a lower end of the liner unit is connected to a cutting edge ring, and a liner is connected to the cutting edge ring. A press-fit rod that extends upward along the inner peripheral surface of the unit is detachably erected,
A liner unit is formed by applying a press-fit load to a blade ring by a press-fitting device using the press-fit rod as a load input portion while excavating a portion corresponding to a pit bottom in a liner unit installed on the ground with the blade ring as a ground portion. Into the ground,
A method of constructing a shaft using a liner plate, wherein the press-fit rod is removed after a well having a predetermined depth is constructed with the liner unit. The liner unit of the next stage is connected to the liner unit pressed into the ground so as to be stacked and added together. The method of constructing a shaft using the liner plate according to claim 1, wherein the method is repeated. A plurality of press-fit rods are erected along the inner peripheral surface of the liner unit, and each press-fit rod is divided into a plurality of pieces in the longitudinal direction with a rod piece having an integral multiple of the height dimension of the liner plate,
3. A shaft using a liner plate according to claim 2, wherein the rod piece is replenished each time the liner unit is replenished or once for each n replenishments of the liner unit. How to build. A reinforcing ring is interposed in all or a part of the connection between the liner units, and the rod element that can function as a part of the press-fit rod can be attached to and detached from the reinforcing ring when the rod element is added. The shaft construction method using the liner plate according to claim 3, wherein the shaft is connected to the shaft. The lowermost liner unit has a plurality of liner plates connected to the lower ends of the plurality of liner plates forming the liner unit, and then covering the inner peripheral surface of the liner plate with concrete. The method for constructing a shaft using a liner plate according to any one of claims 2 to 4, wherein the mouth ring and the concrete layer are integrated. A secondary shaft that is larger than the shaft to be built is constructed in advance, and a press-fitting device is fixedly supported on the secondary shaft via a reaction force receiving member, so that the secondary shaft supports the reaction force accompanying press-fitting of the liner plate. A method for constructing a shaft using the liner plate according to any one of claims 1 to 5. The method for constructing a shaft using a liner plate according to any one of claims 1 to 6, wherein a portion corresponding to a pit bottom in the liner unit is excavated while supplying water to the liner unit.

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