JP2009257070A - Liner plate and deep foundation construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liner plate and a deep foundation construction method, safely performing works, improving working efficiency, reducing cost, and providing a high strength shaft. <P>SOLUTION: An abutting part 53 is abutted on a recess part 11c which constitutes a waveform of a liner plate unit 11 by sliding the abutting part 53 toward the liner plate unit 11. After abutting four abutting parts 53 on the recess part 11c of the liner plate unit 11, the liner plate unit 11 is supported with a supporting frame 5 by tightening each volt 54 to a base 51. A flange part 11a of the liner plate unit 11 and a flange part 12a of a liner plate unit 12 are connected by thread engaging a volt 3 with a nut 4 in an outside of a shaft on the ground or the like. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a liner plate and a deep foundation method.

  In recent years, liner plates are sometimes used in deep foundation methods. The liner plate is provided so as to cover the inner wall surface of the shaft and is used as a soil retaining material.

  In this deep foundation method using the liner plate, for example, as shown in Patent Document 1, a worker connects the flange portions of a plurality of liner plates with bolts in the shaft and provides the liner plate on the inner wall surface of the shaft. Had.

  In this deep foundation method, a backfill material is injected between the outer peripheral surface of the liner plate and the inner wall surface of the shaft, and concrete is placed in the shaft, and the liner plate is fixed as it is in the shaft. It was.

Japanese Patent No. 3084141

  However, in the conventional liner plate and the deep foundation method described above, the worker has to perform the connecting operation of the liner plate in the shaft, which is dangerous and the work efficiency is also poor.

  Further, in the conventional liner plate and the deep foundation method described above, the liner plate is buried in the shaft by placing concrete, so that the cost becomes high, and the outer peripheral surface of the liner plate and the inner wall surface of the shaft There was a problem that the concrete could not be sufficiently filled between the two and a shaft with sufficient strength could not be obtained.

  The present invention has been made in view of the above circumstances, and provides a liner plate and a deep foundation method capable of working safely, improving work efficiency, reducing costs, and obtaining a high-strength shaft. For the purpose.

In order to achieve the above object, the liner plate of the present invention comprises:
A liner plate that is provided on the inner wall surface of a shaft to be excavated so that it can be pulled out, and is configured by connecting a plurality of tubular and concave corrugated liner plate units in the vertical direction,
At least two of the liner plate units connected to each other have flange portions that protrude outwardly and can be connected to peripheral edges facing each other.
Around the excavation position of the shaft and on the ground, it is possible to slide and contact the concave portion of the liner plate unit provided on the base and disposed at the excavation position of the shaft It is supported by a support member having a plurality of protruding contact parts.

  Moreover, the flange part of the said liner plate unit can be connected with a volt | bolt and a nut.

  Further, the flange portions of the liner plate unit can be connected to each other outside the shaft.

  Further, it is possible to remove the connection between the flange portions of the liner plate unit outside the shaft.

  The liner plate unit is supported by the support member so as to be movable in the vertical direction at the excavation position of the shaft.

  Further, it is possible to pull out a predetermined distance from the shaft depending on a predetermined height of the concrete placed in the shaft.

In addition, the base is formed as a frame by upper and lower joining plates in which through holes are formed, and frame pieces joined by the joining plates,
The support member includes a plurality of rod-shaped fixing members that are fitted into the through holes of the joining plate and driven into the ground.

In order to achieve the above object, the deep foundation method of the present invention comprises a step of excavating a shaft and a corrugated liner plate unit having a plurality of cylindrical and concave portions on the inner wall surface of the excavated shaft in the vertical direction. A deep foundation method having a step of connecting and installing, a step of placing concrete in the shaft, and a step of pulling out the liner plate unit from the shaft,
A step of installing a base around the excavation position of the shaft and on the ground;
A plurality of protruding contact members provided on the base are slid and contacted toward the concave portion of the liner plate unit disposed at the excavation position of the shaft to support the liner plate unit. And a process of
Outside the shaft, a flange projecting outward from the upper peripheral edge of the liner plate unit supported by the contact member, and projecting outward from the lower peripheral edge of the other liner plate unit And a step of connecting the provided flange portion.

  The step of connecting the flange portions is performed by screwing a nut onto a bolt and tightening the nut.

  Moreover, it has the process of removing the connection of the said flange parts outside the said shaft.

  The liner plate unit is supported so as to be movable in the vertical direction at the excavation position of the shaft.

  Moreover, it has the process of pulling out the said liner plate unit from the said shaft within a predetermined distance according to the predetermined height of the concrete cast | placed in the shaft.

  According to the present invention, it is possible to provide a liner plate and a deep foundation method that can be safely operated, work efficiency is improved, cost is reduced, and a high-strength shaft can be obtained.

It is a perspective view showing the structure of the liner plate and support frame which concern on embodiment of this invention. It is a perspective view showing the state before the connection of the liner plate unit shown in FIG. 1, and the structure of a support frame. It is an expanded sectional view of the connection part of the liner plate shown in FIG. FIG. 2 is an enlarged partial cross-sectional view of a contact portion between a liner plate and a support frame illustrated in FIG. 1. It is sectional drawing for demonstrating the deep foundation construction method which concerns on embodiment of this invention. It is a partially-omission perspective view showing the structure of the support frame provided with the fixing member which concerns on the modification of this invention.

  A liner plate and a deep foundation method according to an embodiment of the present invention will be described below with reference to the drawings.

  The liner plate 1 can be installed on the inner wall surface of the shaft so that it can be pulled out, and is used as a soil retaining material. As shown in FIG. 1, the liner plate 1 is configured by connecting a plurality of liner plate units 11, 12, 13, 14,... In the vertical direction that is the excavation direction of the shaft 2.

The liner plate units 11, 12, 13, 14... Are formed of cylindrical steel plates and have a corrugated shape in the vertical direction. The wave shape of the liner plate units 11, 12, 13, 14... Has concave portions 11c, 12c, 13c, 14c.
As shown in FIGS. 1 and 2, the adjacent liner plate units 11 and 12 are respectively formed with flange portions 11 a and 12 a projecting outward from one peripheral edge portion. The peripheral edge of the liner plate unit 11 and the peripheral edge of the liner plate unit 12 are in a positional relationship facing each other. A plurality of bolt holes 11b and 12b (FIG. 3) are formed in the flange portions 11a and 12a, respectively.
In FIG. 1, the liner plate connected above the liner plate unit 14 and the liner plate connected below the liner plate 11 are omitted. The liner plate 11a (FIG. 5) is constituted by the liner plate 11 and the liner plate connected below the liner plate 11, and the liner plate unit connector 1b (FIG. 5) is constituted by the liner plate units 12, 13, 14. Is configured.

As shown in FIGS. 1 and 3, the liner plate unit 11 and the liner plate unit 12 are connected to each other by screwing a nut 4 to the bolt 3 outside the shaft such as on the ground as shown in FIGS. Is done. Since the positions of the flange portion 11a and the flange portion 12a are higher than the ground, it is easy to perform the connecting operation.
In order to connect the flange portion 11a and the flange portion 12a, as shown in FIG. 3, the flange portion 11a and the flange portion 12a are brought into contact with each other so that the positions of the bolt hole 11b and the bolt hole 12b coincide with each other. Then, the nut 4 is screwed onto the bolt 3.

  Moreover, the connection of the flange part 11a and the flange part 12a can be released by releasing the screwing of the nut 4 to the bolt 3 outside the shaft such as on the ground.

  The lower side of the liner plate unit 11, the upper side of the liner plate unit 12, the liner plate units 13, 14... Have a flange portion (not shown) inside the periphery, and are connected by bolts and nuts at the flange portion. Thus, liner plate unit coupling bodies 1a and 1b (FIG. 5) are formed.

  As shown in FIGS. 1, 2, and 4, the support frame 5 is a support member that guides the liner plate 1 to the shaft 2 and supports the liner plate 1. The support frame 5 includes a base 51 installed on the ground formed by joining steel materials and a projecting contact portion 53 provided near the center of each frame piece 52 of the base 51. Yes. The base 51 is installed around the excavation position of the shaft 2. The contact portion 53 is provided so as to be slidable in the direction of the liner plate 1 installed in the frame of the base 51. In FIGS. 1 and 2, only two contact portions 53 among the four contact portions 53 are illustrated.

The contact portion 53 is formed with a guide hole 53a in which the direction of the liner plate 1 installed in the frame of the base 51 is the longitudinal direction. Bolts 54 and 54 are inserted through the guide hole 53a.
The bolts 54 and 54 are screwed into fixing holes 52 a and 52 a (FIG. 4) formed in the frame piece 52. The bolts 54 and 54 restrict the sliding of the contact portion 53 in the direction of the liner plate 1 installed in the frame of the base 51 through the guide hole 53a.

  In order to support the liner plate 1 installed in the frame of the base 51 by the support frame 5, first, the screws 54 and 54 fastened to the base 51 are loosened. By loosening the screwing of the bolts 54, 54, the contact portion 53 can slide in the direction of the liner plate 1.

The contact portion 53 is slid toward the liner plate 1, and as shown in FIG. 4, a projecting contact portion 53 is formed on the concave portion 11 c constituting the wave shape of the liner plate unit 11 (liner plate 1). Abut. After the four abutting portions 53 are brought into contact with the concave portion 11c of the liner plate unit 11, the bolts 54 and 54 are screwed into the fixing holes 52a and 52a of the base 51 and tightened, whereby the support frame 5 The liner plate 1 is supported.
Similarly, the contact portion 53 can also contact the concave portions 12c, 13c, 14c... Of the liner plate units 12, 13, 14.

Next, the deep foundation method using the liner plate 1 according to the embodiment of the present invention will be described with reference to FIG.
First, the support frame 5 is installed so that the position where the shaft 2 is excavated is located in the frame. After the support frame 5 is installed, the shaft 2 is excavated by, for example, the clam shell 6 as shown in FIG. After the excavation by the clamshell 6, the worker uses the handrail 7 or the like to correct and excavate the natural ground.

  Next, as shown in FIG. 5B, the liner plate unit connection body 1a is suspended by the crane 8, and the liner plate unit connection body 1a is placed at the excavation position of the shaft 2 and set to a predetermined height. By sliding the contact portion 53 of the support frame 5 into contact with the concave portion 11c of the liner plate unit connector 1a (liner plate unit 11) and tightening the bolts 54, 54, the liner plate unit connector 1a is fixed. As shown in FIG. 5 (C), it is supported by a support frame 5.

  Next, the shaft 2 is excavated to a predetermined depth by the clam shell 6 as shown in FIG. Then, corrective excavation by workers is performed.

Next, as shown in FIG. 5D, the liner plate unit connection body 1 b is lifted by the crane 8 and overlapped on the liner plate unit connection body 1 a fixed to the support frame 5. At this time, the flange portion 11a formed on the upper peripheral edge of the liner plate unit connector 1a (liner plate unit 11) and the lower peripheral edge of the liner plate unit connector 1b (liner plate unit 12) are formed. The flange portions 12a are brought into contact with each other so that the positions of the bolt holes 11b and 12b formed in the flange portions 12a coincide with each other.
In addition, the flange part 11a formed in the periphery of the upper surface side of the liner plate unit coupling body 1a (liner plate unit 11) is fixed at a position higher than the ground by a predetermined distance.

  Then, the liner plate unit connector 1a and the liner plate unit connector 1b are connected by inserting the bolt 3 into the bolt holes 11b and 12b, screwing the nut 4 into the bolt 3, and tightening. This operation can be performed on the ground outside the shaft 2.

Thereafter, mechanical excavation by the clam shell 6, correction excavation by the worker, release of the support by the support frame 5 of the liner plate 1, lowering of the liner plate 1 into the shaft 2 while being suspended by the crane 8, the support frame The support of the liner plate 1 by 5 is repeated, and the shaft 2 is excavated to a predetermined excavation length as shown in FIG.
The liner plate 1 is supported by the support frame 5 by bringing the contact portion 53 of the support frame 5 into contact with the concave portions 11c to 14c.

  After excavation of the vertical shaft 2, as shown in FIG. 5 (F), the main reinforcement 9 and the hoop reinforcement 10 are arranged in the vertical shaft 2 to assemble the reinforcing bars.

Then, using the concrete chute 80, the concrete 90 is placed in the shaft 2, and the liner plate 1 is pulled out from the shaft 2. When the concrete 90 is placed and raised to a predetermined height or more from the foundation bottom, the liner plate 1 is moved to the crane 8 according to the predetermined height of the placed concrete 90 as shown in FIG. Is pulled out from the shaft 2 by a predetermined distance. Moreover, when the joint part of liner plate unit coupling body 1a, 1b appears outside the shaft 2, the liner plate unit coupling body 1a, 1b is disconnected.
In order to disconnect the liner plate unit coupling bodies 1a and 1b from each other, the contact portion 53 of the support frame 5 is brought into contact with the concave portion 11c of the liner plate unit coupling body 1a so that the liner plate unit coupling body 1a is supported by the support frame 5. The bolt 3 and the nut 4 are released from each other while being supported, and only the liner plate unit connector 1b is lifted by the crane 8. At the time of releasing the connection, the flange portions 11a and 12a of the liner plate unit connecting bodies 1a and 1b are located at a predetermined distance higher than the ground.
Thereafter, the remaining liner plate assembly 1 a is pulled out from the shaft 2 by a predetermined length while being suspended by the crane 8.
The concrete chute 80 is removed manually one by one.
The concrete 90 is placed by bringing the contact portion 53 of the support frame 5 into contact with the concave portions 11c to 14c of the liner plate unit coupling bodies 1a and 1b as necessary to stabilize the liner plate 1. Is called.

  As shown in FIG. 5 (H), the concrete 90 is placed in the shaft 2 and the liner plate 1 is pulled out from the shaft 2, and the deep foundation method is completed.

  Thus, in this embodiment, outside the shaft 2 such as on the ground, the nut 4 is screwed into the bolt 3 to connect the flange portion 11a and the flange portion 12a formed outward. Since the liner plate connector 1a (liner plate unit 11) and the liner plate connector 1b (liner plate unit 12) are connected to each other, it can be safely performed without any danger as in the work in the shaft 2. Work can be performed, and the work efficiency of the connecting work is improved.

  Further, in the present embodiment, the contact portion 53 is brought into contact with the concave portions 11c, 12c, 13c, 14c... Of the liner plate units 11, 12, 13, 14. 1 is supported, the liner plate 1 can be supported so as to be movable in the vertical direction at the excavation position of the shaft 2. For this reason, the liner plate 1 can be stably guided and installed to the shaft 2, and the liner plate 1 can be stably pulled out from the shaft 2. Moreover, the efficiency of the connection operation | work of the liner plate 1 and a connection release operation | work can be improved.

  Moreover, in this Embodiment, since the liner plate 1 was pulled out from the inside of the shaft 2 with the concrete 90 placement operation, the liner plate 1 is not buried and the deep foundation method is applied. Cost can be reduced. Furthermore, the concrete 90 can be sufficiently filled with the concrete by placing the concrete 90, so that a sufficiently strong shaft can be obtained.

  Further, in this embodiment, when the liner plate 1 is pulled out from the shaft 2, the connection of the liner plate 1 is facilitated by releasing the screwing of the nut 4 to the bolt 3 outside the shaft 2 such as on the ground. The work efficiency of the pulling out work is good.

While the present invention has been described with reference to the embodiment, the present invention is not limited to the above embodiment, and various modifications can be made. For example, as shown in FIG. 6, the support frame 5 may be provided with a rod-like fixing member 58 made of a pipe or the like driven into the ground. Through holes 56a and 57a are formed in an upper joining plate 56 and a lower joining plate 57 for joining the frame pieces 52 of the support frame 5 with squares, respectively. After the rod-shaped fixing member 58 is fitted into the through holes 56a and 57a, the supporting frame 5 is stably fixed on the ground by driving the fixing member 58 into the ground.
Thereby, positioning with respect to the shaft 2 of the liner plate 1 supported by the support frame 5 can be performed correctly, and the shift | offset | difference of a pile core can be suppressed slightly.

  Further, for example, in the present embodiment, an example in which the crane 8 is used in the drawing operation of the liner plate 1 has been described. However, four hydraulic winch hooks are hooked on the lower edge of the liner plate 1 at approximately equal intervals, The drawing operation may be performed by lifting the liner plate 1 using a hydraulic winch.

  In the present embodiment, the example in which the flange portion 11a and the flange portion 12a are connected by the bolt 3 and the nut 4 has been described. However, the connecting means is not limited to the bolt 3 and the nut 4, and the connection and the release of the connection can be performed. Any means is possible if possible.

  Further, in the present embodiment, the example in which the base 51 of the support frame 5 is formed as a frame has been described. However, even if the base is not integrated, the contact portion 53 can be provided, and the shaft 2 As long as it is installed on the ground around the excavation position, it may be a separate body.

  Further, in the present embodiment, an example in which four contact portions 53 are provided has been described. However, a plurality of contact portions 53 may be used, and an example in which the shape of the contact portion 53 is a U-shaped cross section and a protrusion shape is described. However, any protruding shape that can support the liner plate 1 by contacting the concave portions 11c, 12c, 13c, and 14c of the liner plate units 11, 12, 13, and 14 may be used.

  In the present embodiment, the example in which the contact portion 53 is slidably fixed to the frame piece 52 of the base 51 by the bolts 54 and 54 has been described. However, a bolt and a nut may be used, The means is not limited to a bolt or the like as long as the contact portion 53 can be slidably fixed to the base 51.

  Further, in the present embodiment, the example in which the liner plate 1 is configured by the liner plate connector 1a and the liner plate unit connector 1b has been described. However, depending on the depth of the shaft 2, the liner plate unit connector You may increase the number. Further, the liner plate 1 does not need to be configured only by the liner plate unit coupling body, and may be configured to include the liner plate unit alone. Moreover, the size of each liner plate unit does not need to be constant, and the number of concave portions each has is not limited.

  In the present embodiment, when the liner plate unit connector 1a and the liner plate unit connector 1b are connected and disconnected, the contact portion 53 contacts the recess 11c of the liner plate unit 11 of the liner plate unit connector 1a. However, the contact portion 53 may be brought into contact with the recess of the liner plate unit coupling body 1a other than the recess 11c.

DESCRIPTION OF SYMBOLS 1 Liner plate 1a, 1b Liner plate unit coupling body 11-14 Liner plate unit 11a, 12a Flange part 11b, 12b Bolt hole 11c-14c Recessed part 2 Shaft 3 Bolt 4 Nut 5 Support frame (support member)
51 Base 52 Frame piece 53 Contact part 53a Guide hole 54 Bolt 58 Fixing member 8 Crane 90 Concrete

Claims (12)

A liner plate that is provided on the inner wall surface of a shaft to be excavated so that it can be pulled out, and is configured by connecting a plurality of tubular and concave corrugated liner plate units in the vertical direction,
At least two of the liner plate units connected to each other have flange portions that protrude outwardly and can be connected to peripheral edges facing each other.
Around the excavation position of the shaft and on the ground, it is possible to slide and contact the concave portion of the liner plate unit provided on the base and disposed at the excavation position of the shaft A liner plate supported by a support member having a plurality of protruding contact portions.   The liner plate according to claim 1, wherein the flange portion of the liner plate unit is connectable by a bolt and a nut.   The liner plate according to claim 1 or 2, wherein the flange portions of the liner plate unit can be connected to each other outside the shaft.   The liner plate according to any one of claims 1 to 3, wherein the flange portions of the liner plate unit can be disconnected from each other outside the shaft.   The liner plate according to any one of claims 1 to 4, wherein the liner plate unit is supported by the support member so as to be movable in a vertical direction at an excavation position of the shaft.   The liner plate according to claim 5, wherein the liner plate can be pulled out from the shaft by a predetermined distance according to a predetermined height of the concrete cast in the shaft. The base is formed as a frame by upper and lower joining plates in which through holes are formed and frame pieces joined by the joining plates,
The liner plate according to any one of claims 1 to 6, wherein the support member includes a plurality of rod-shaped fixing members which are fitted into the through holes of the joining plate and driven into the ground. A step of excavating the shaft, a step of installing a corrugated liner plate unit having a plurality of cylindrical and concave portions on the inner wall surface of the excavated shaft, and installing concrete in the shaft A deep foundation method having a step and a step of pulling out the liner plate unit from the shaft,
A step of installing a base around the excavation position of the shaft and on the ground;
A plurality of protruding contact members provided on the base are slid and contacted toward the concave portion of the liner plate unit disposed at the excavation position of the shaft to support the liner plate unit. And a process of
Outside the shaft, a flange projecting outward from the upper peripheral edge of the liner plate unit supported by the contact member, and projecting outward from the lower peripheral edge of the other liner plate unit A deep foundation method characterized by comprising a step of connecting a flange portion provided.   The deep foundation method according to claim 8, wherein the step of connecting the flange portions is performed by screwing and tightening a nut to a bolt.   The deep foundation method according to claim 8 or 9, further comprising a step of disconnecting the flange portions from each other outside the shaft.   11. The deep foundation method according to any one of claims 8 to 10, wherein the liner plate unit is supported so as to be movable in an up-down direction at an excavation position of the shaft.   12. The method according to claim 8, further comprising a step of drawing out the liner plate unit from the shaft by a predetermined distance according to a predetermined height of the concrete placed in the shaft. Described foundation method of construction.

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