JP5116443B2 - Deep foundation, construction method of deep foundation and work scaffold for deep foundation - Google Patents

Description

  The present invention relates to, for example, a deep foundation for installing a transmission tower, a construction method for the deep foundation, and a work platform for the deep foundation used when constructing the deep foundation. The present invention relates to a work foundation for a deep foundation for performing work such as assembling a reinforcing bar in a vertical shaft, a construction method for a deep foundation using the work scaffold, and a deep foundation constructed by this construction method.

  Steel towers such as power transmission towers are installed on deep foundations. As shown in FIG. 6, the deep foundation is provided with a retaining frame 110 on the inner wall of the excavated shaft 100, a reinforcing bar 120 is assembled inside the retaining frame 110, and concrete is placed therein. Is built by The shaft 100 is excavated to have an inner diameter of 3 m and a depth of about 17 m, for example.

  The earth retaining frame 110 is constructed by assembling a cylindrical plate by joining liner plates 111 whose inner and outer surfaces are corrugated and arcuate in plan view in a zigzag manner in the circumferential direction and the vertical direction. As shown in FIG. 7, the liner plate 111 is provided with end plates 112 and 112 at both ends, and flanges 113 and 113 at upper and lower edges, respectively, and fastening holes 114, 114,. 1). In such a liner plate 111, the adjacent end plate 112 and end plate 112, and the flange portion 113 and the flange portion 113 are overlapped, and the fastening holes 114, 114,. The bolts (not shown) are inserted and fastened to 114,... To construct the earth retaining frame 110 while excavating the shaft 100, that is, sequentially from the ground surface side.

  The reinforcing bar rod 120 has a plurality of vertical reinforcing bars 121, 121,..., Which are vertically arranged in a vertical posture, and a plurality of annular hoop bars 122 surrounding the vertical reinforcing bars 121, 121,. Z)). Such a reinforcing bar 120 is assembled from the bottom side when an operator works on a work scaffold 130 as shown in FIG.

  The work scaffold 130 is configured by combining a pipe 131 placed on the hoop bar 122 already bound to the steel reinforcing bars 121, 121,... And a work floor 132 placed on the pipe 131. The pipe 131 is fixed to the hoop bar 122 by a wire (not shown) or the like. Alternatively, although not shown, a work scaffold 130 that does not use the pipe 131 and is configured to hook hooks provided at both ends of the work floor 132 to the hoop muscle 122 is also used.

  Further, some work scaffolds 130 are configured by scaffold plates 135, 135,... Combined in a cross beam shape as shown in FIG. 8 (see Patent Document 2). Both end portions of each scaffold plate 135 are placed on the hoop muscle 122 and fixed by a wire (not shown) or the like.

  Such a working scaffold 130 is fixed to the upper hoop muscle 122 sequentially, for example, at an interval of 1.5 m. That is, when the work is completed, a new work scaffold 130 is provided above the work scaffold 130 that was working. The lower scaffold plate 135 and the work floor 132 are used as the upper work scaffold 130.

Japanese Patent Laid-Open No. 10-152853 Japanese Patent Laid-Open No. 10-266228

In the work scaffold 130 shown in FIG. 6, the work floor 132 is made of iron and has a heavy weight. Therefore, the work to be lifted for use as the upper work scaffold 130 is heavy labor. Further, the work scaffold 130 shown in FIG. 8 is not only poor in stability because the scaffold plates 135 are combined in a cross-beam shape, but also has a narrow width, so there is no space for placing materials and tools.

  Furthermore, since any work scaffold 130 is placed on the hoop muscle 122 and one or a plurality of workers ride on it, a large load is applied to the hoop muscle 122. However, since the hoop bar 122 is only fixed to the bar reinforcing bars 121, 121,... By a wire or the like, the hoop bar 122 may be displaced downward when a large load is applied. Then, not only the rebar rod 120 assembled with great effort will lose its shape, but also the work scaffold 130 may collapse, which may put the worker in a dangerous state.

  Therefore, the present invention provides a working platform for a deep foundation, which is set in a stable state, secures a wide working space, reduces weight, and prevents the assembled reinforcing bar rod from being out of shape. It is an object to provide a deep foundation foundation constructed by the construction method of the deep foundation using the foundation and the construction method of the deep foundation.

A working foundation for a foundation foundation according to the present invention includes a liner plate having upper and lower ribs each having a fastening hole, which is vertically continued along an inner wall of an excavated shaft, and the ribs are overlapped. It is a working scaffold for deep foundations assembled inside the earth retaining frame,
A pair of individual support bars separated from each other on the opposite flanges of the liner plate and a panel supported by the support bars are provided , and the flanges of the liner plate are spaced circumferentially. Among the plurality of fastening holes formed, the length of the line segment is in each of the pair of support bars with respect to four fastening holes in which the line segment connecting the fastening hole and the fastening hole has a parallel relationship. A pair of fixing holes that are spaced apart from each other is provided, and the pair of support bars are fixed to the liner plate in parallel by a fastener that is inserted through the corresponding fastening hole and the fixing hole . .

  According to the working foundation for the foundation foundation, a pair of support bars are bridged over the opposite ribs of the liner plate, so that even if an operator gets on the panel supported on the support bar, This work scaffold can be prevented from collapsing, and the assembled reinforcing bar rod can be prevented from collapsing. Furthermore, since the panel is supported by the pair of support bars, the panel can be enlarged to such an extent that the panel can be disposed inside the saddle reinforcing bar that is annularly installed in the earth retaining frame.

  According to the working foundation for the deep foundation, the fastener is inserted into the fixing hole provided in the support bar and the fastening hole of the liner plate, and the support bar is fixed to the liner plate. Safety can be improved by preventing the plate from dropping from the collar.

Further, a working platform for a foundation foundation according to the present invention different from the above, a liner plate having upper and lower ribs having fastening holes is continuously provided in the vertical direction along the inner wall of the excavated shaft. A working foundation for a foundation foundation assembled inside a retaining frame constructed by overlapping parts, and a pair of separate individual support bars that are spanned between opposite collars of the liner plate; And a panel supported by the support bar, and a pair of mounting bars are spanned on the support bar, and the mounting bar has the same length as the support bar. It is a feature .
According to the working foundation for the deep foundation, since the support bar and the mounting bar are assembled in a frame shape, each bar can be prevented from being displaced. Therefore, it is preferable that the support bar and the mounting bar are fixed by a fastener or the like.

Further, a working platform for a foundation foundation according to the present invention different from the above, a liner plate having upper and lower ribs having fastening holes is continuously provided in the vertical direction along the inner wall of the excavated shaft. A working foundation for a foundation foundation assembled inside a retaining frame constructed by overlapping parts, and a pair of separate individual support bars that are spanned between opposite collars of the liner plate; A panel that is supported by the support bar, and a line segment that connects the fastening hole and the fastening hole among the plurality of fastening holes formed in the flange portion of the liner plate with a circumferential interval is provided. For the four fastening holes that are in parallel relation, each of the pair of support bars is provided with a pair of fixing holes that are spaced apart according to the length of the line segment, A pair of support bars by the fasteners to be inserted Is fixed to the liner plate is parallel, said the support bar, a pair of rests bars spans, is characterized in that the placing cover is the same length as the support bar.

Further, in the working foundation for deep foundation according to the present invention, the panel is divided into a plurality of units, and one or a plurality of intermediate bars for supporting each unit are bridged between the pair of mounting bars. Preferably, the intermediate bar has the same length as the support bar .

  According to this deep foundation work platform, the panel is divided into units, so that each unit is lighter than a single panel, and the unit can be either a support bar, a mounting bar, or an intermediate bar. The burden of the work to mount can be reduced. When only one intermediate bar is spanned, the panel is divided into two units, and each unit is supported on any one of a support bar, a mounting bar, and an intermediate bar. When a plurality of intermediate bars are spanned, the panel is divided into three or more units, and each unit is supported by one support bar, one intermediate bar, and a pair of intermediate bars.

  Further, in the working foundation for a deep foundation according to the present invention, the support bar, the mounting bar and / or the intermediate bar may be configured by an L-shaped angle including a vertical portion and a horizontal portion. preferable.

  According to this work foundation for deep foundations, each bar is difficult to bend because the support bar, the mounting bar and / or the intermediate bar are configured by an L-shaped angle composed of a vertical part and a horizontal part. Can be.

  Moreover, in the working foundation for deep foundations according to the present invention, it is preferable that the support bar and the intermediate bar are bridged in a direction in which the vertical portion stops the side surface of the panel.

  According to the work foundation for deep foundation, each bar is placed in a direction where the vertical part stops the side of the panel (including the unit) so that the panel is not displaced. it can.

  Further, a construction method for a deep foundation according to the present invention is a construction method for a deep foundation using a work foundation for the deep foundation, which is constructed on the inner wall of an excavated shaft. A step of providing an earth retaining frame in which the collar portions overlap each other by continuating a liner plate provided with a collar portion, and a step of standing a plurality of braided reinforcing bars in an annular shape in a vertical posture inside the earth retaining frame; A step of assembling a working foundation for a deep foundation by bridging a pair of support bars on the flange portion of the liner plate and placing a panel on the support bar; and binding a hoop bar to the bar reinforcing bar It is characterized by including a process of assembling and a process of placing concrete in the shaft.

  According to the construction method of the deep foundation, the working scaffold for the deep foundation can be assembled using the earth retaining frame provided on the inner wall of the excavated shaft. In this work scaffold, since a pair of support bars are bridged over the ridges of the liner plate where the earth retaining frame is provided, and not over the hoop bars bound to the reinforced bars as in the prior art, the assembled reinforcement bar is not It is possible to ensure the safety of workers on the work platform without losing shape. Furthermore, since the panel of the work scaffold is placed on the support bar, the panel can be made large to the extent that it is surrounded by the steel bar. And a support bar and a mounting bar remain | survive in a shaft, are embedded in concrete, and act like a reinforcing bar.

  Moreover, in the construction method of the deep foundation according to the present invention, it is preferable that the panels are not used in the concrete that has been used in order from the bottom side of the shaft to the ground surface.

  According to the construction method of this foundation, it is possible to save the panel by sequentially reusing the panel from the bottom side of the shaft toward the ground surface.

  Moreover, the deep foundation according to the present invention is characterized by being constructed by the construction method of the deep foundation.

  According to this deep foundation, a pair of support bars used as work scaffolds are embedded in concrete and act like a reinforcing bar.

  According to the working foundation for deep foundations according to the present invention, the support bar for supporting the panel is bridged on the opposite collar portion of the liner plate, so that the panel is supported in a stable state, and safety is improved. Not only can it be improved, but also the assembled reinforcing bar can not be out of shape, and the panel can be enlarged to ensure a large work space, thereby improving work efficiency. Moreover, the construction method of the deep foundation according to the present invention and the constructed deep foundation can shorten the work period.

  A first embodiment of a deep foundation, a construction method for a deep foundation, and a working scaffold for a deep foundation according to the present invention will be described with reference to FIGS. 1 and 2. However, the same parts as in the prior art will be described with the same reference numerals.

  The working foundation for deep foundation in the present embodiment is assembled by using a liner plate 111 constituting a retaining frame 110 constructed on the inner wall of the excavated shaft 100. In other words, the working foundation for the deep foundation is composed of a pair of support bars 10, 10 spanned on the flange 113 formed on the upper and lower edges of the liner plate 111, and a panel 40 supported by the support bars 10, 10. It has. Since the earth retaining frame 110 is constructed in a cylindrical shape, there are opposing liner plates 111, 111, and end portions of the support bars 10, 10 on the flanges 113, 113 of the opposing liner plates 111, 111. Is placed.

  And the fixing holes 11 and 11 connected to the fastening holes 114 and 114 formed in the collar part 113 are provided in the both ends of the support bars 10 and 10, respectively. Therefore, the support bar 10 is formed in a length that coincides with the fastening holes 114, 114,... Of the liner plate 111 facing the pair of fixing holes 11, 11. The support bar 10 is fixed onto the flange 113 of the liner plate 111 by inserting the fastener 1 such as a bolt through the fixing holes 11 and 11 and the fastening holes 114 and 114. However, the support bar 10 may be fixed to the lower surface of the flange portion 113 of the liner plate 111.

  The working foundation for the deep foundation includes a pair of mounting bars 20, 20 spanned between the pair of support bars 10, 10 and intermediate bars 30, 30 spanned over the mounting bars 20, 20. I have. The intermediate bar 30 is stretched over the mounting bars 20, 20 in parallel with the support bar 10. The support bar 10, the mounting bar 20, and the intermediate bar 30 can all be used by setting them to the same length, but they may be different lengths. In addition, fixing holes 12, 22, and 32 for inserting the fasteners 1 such as bolts are formed at two intermediate positions of the bars 10, 20, and 30. Furthermore, fixing holes 21 and 21 communicating with the fixing hole 12 in the middle of the support bar 10 are formed at both ends of the mounting bar 20.

  The support bar 10, the mounting bar 20, and the intermediate bar 30 are L-shaped stainless steel composed of a vertical portion x and a horizontal portion y in order to prevent bending and to prevent the panel 40 from being displaced. It is made up of an angle made by us. Therefore, the support bar 10 spanned over the upper surface of the flange portion 113 of the liner plate 111 has the vertical portion x facing upward, the mounting bar 20 has the vertical portion x facing downward, and the intermediate bar 30 The direction portion x is upward, and the horizontal portions y of the bars 10, 20, and 30 are overlapped.

  Further, the intermediate bar 30 is stretched over the mounting bars 20 and 20 in an inverted T-shape in which two L-shaped angles are joined with the longitudinal portions x and x back to back. Here, unless otherwise specified, it is assumed that one intermediate bar 30, 30 is configured by combining two angles.

  And the fixing holes 12, 22, and 32 formed in the intermediate part of each bar | burr 10,20,30 connect, Fasteners 1 such as a volt | bolt are inserted in this fixing hole 12,22,32, and each bar | burr 10, 20 and 30 are fixed together. Accordingly, the bars 10, 20, and 30 are not displaced even when an external force such as kicking is applied.

  The panel 40 is supported on the horizontal portions y of the support bars 10 and 10 and the intermediate bars 30 and 30 assembled in this way. Accordingly, the panel 40 is divided into units 41, 42, and 43 that are sized to be supported by the intermediate bars 30 and 30. That is, as shown in the figure, when the two intermediate bars 30, 30 are bridged over the mounting bars 20, 20, they are divided into three units 41, 42, 43. Although not shown, when only one intermediate bar 30 is spanned over the mounting bars 20, 20, the panel 40 is divided into two units 41, 43 and three intermediate bars 30, 30, 30. , The panel 40 is divided into four units 41, 42, 43,...

  In any case, each unit 41, 42, 43 has the lower surface of the side edge portion placed on the support bar 10 and the horizontal portion y of the intermediate bar 30, and the side surface of the side edge portion is the vertical length of the support bar 10 and intermediate bar 30. It is in a state in which it strikes against the direction portion x, and is prevented from being displaced in the length direction of the mounting bars 20, 20. In addition, each unit 41, 42, 43 is in a state in which the side surface of the end edge portion is brought into contact with the fastener 1 that integrally fixes the bars 10, 20, 30, and is displaced in the length direction of the support bar 10. Not to be. Therefore, the length of each unit 41, 42, 43 is the same as the distance between the pair of fasteners 1.

  In this way, the units 41, 42, and 43 of the panel 40 are supported on the support bar 10 and the intermediate bar 30, whereby the working scaffold for the deep foundation is assembled. Then, an operator rides on the panel 40 and performs a work such as binding the hoop bars 122 to the plurality of pigeon bars 121, 121,.

  Since the support bars 10 and 10 supporting the panel 40 are fixed to the flange portion 113 of the liner plate 111 and are not bridged over the hoop bar 122, not only the stable state but also the assembled bar bar 120 is assembled. Since the panel 40 is large enough to be placed inside the steel bars 121, 121,... That are erected in a ring shape without being out of shape, tools or the like may be placed on the panel 40. It becomes possible and the worker can work efficiently.

  Here, the construction method of the foundation foundation which constructs the foundation foundation using such a working scaffold will be described. As for the deep foundation, while excavating the vertical shaft 100, a large number of liner plates 111, 111,... That is, the earth retaining frame 110 presses the liner plate 111 against the inner wall of the shaft 100 while the shaft 100 is excavated, and overlaps the flanges 113 and 113 provided on the upper and lower edges of the liner plate 111 and 111. In addition, the fastener 1 is constructed by being inserted into the fastening holes 114 and 114 formed in the flange portions 113 and 113 and fastened.

  When the shaft 100 is excavated to a predetermined depth, a plurality of vertical bars 121, 121,... Subsequently, the hoop bars 122 are surrounded by the reinforcing bars 121, 121,... At a predetermined interval from the bottom side, and are bound by a wire (not shown) or the like. For work such as binding the steel reinforcing bars 121, 121,... And the hoop bars 122, work scaffolds are assembled from the bottom at intervals of 1.5 m, for example.

  That is, first, the pair of support bars 10, 10 are bridged over the flange 113 of the liner plate 111. At this time, the fastener 1 that has been fastened to the fastening holes 114 and 114 of the flange 113 over which both ends of the support bar 10 are bridged is temporarily removed, and the fixing holes 11 of the support bar 10 and the flanges of the liner plates 111 and 111 are temporarily removed. The fastening holes 114 and 114 of the portions 113 and 113 are communicated with each other, and the fastener 1 is inserted through the fixing hole 11 and the fastening holes 114 and 114 again to fix the support bars 10 and 10 to the liner plate 111.

  When the earth retaining frame 110 is constructed, the fastening holes 114 that are not fastened by fastening the fasteners 1 are not fastened to all the fastening holes 114, 114,... Of the liner plate 111. 114 and the fixing holes 11 and 11 of the support bars 10 and 10 can be communicated, and the fastening of the liner plate 111 and the fixing of the support bar 10 can be performed at one time.

  Subsequently, the pair of mounting bars 20, 20 are bridged between the pair of support bars 10, 10. The fixing holes 21, 21 at both ends of the mounting bars 20, 20 communicate with the fixing holes 12, 12 at the intermediate part of the support bars 10, 10, and the fastener 1 is inserted into the fixing holes 21, 12. Thus, the support bars 10 and 10 and the mounting bars 20 and 20 are integrated.

  Then, intermediate bars 30 and 30 (two are shown in the drawing, but may be one or three or more) are placed between the pair of mounting bars 20 and 20. The fixing holes 22 and 32 at both intermediate portions of the mounting bar 20 and the intermediate bar 30 communicate with each other, and the fastener 1 is inserted into both the fixing holes 22 and 32, whereby the mounting bars 20 and 20 and the intermediate bar 30, 30 is integrated.

  Finally, the units 41 and 43 of the panel 40 are placed on one support bar 10 and one intermediate bar 30. Further, the unit 42 of the panel 40 is placed on the two intermediate bars 30 and 30. Therefore, the panel 40 in which the units 41, 42, and 43 are combined is set in a stable state. As shown in the figure, when the support bars 10, 10 and the intermediate bars 30, 30 are placed on the mounting bars 20, 20, the units 41, 42, 43 are mounted on the mounting bars 20, 20. It will be in a state where it cannot be placed on top.

  Each unit 41, 42, 43 is sandwiched between a pair of longitudinal portions x and a pair of fasteners 1, 1 of each bar 10, 20, 30 so as not to be displaced. Furthermore, since the support bars 10 and 10 are not bridged over the hoop bars 122, the assembled reinforcing bar rod 120 does not lose its shape.

  Then, the operator gets on the panel 40 and performs work such as binding the hoop bars 122 to the reinforcing bars 121, 121,. Since a large panel 40 is used, it is also possible to place a tool on the panel 40 and improve work efficiency. The intermediate unit 42 of the panel 40 placed on the two intermediate bars 30 and 30 is not always necessary for the work, but is set in order to prevent an operator or a tool from falling. It is preferable.

  When the work on the panel 40 is finished, for example, the pair of support bars 10 and 10 are bridged on the flange 113 of the liner plate 111 on the upper side of 1.5 m in the same manner as described above. Is bridged over a pair of support bars 10, 10, and the intermediate bars 30, 30 are bridged over a pair of mounting bars 20, 20. Then, the unit of the panel 40 on which the worker is on is placed on each of the bars 10, 20, 30 laid over the upper side. That is, the panel 40 is reused sequentially from the bottom side toward the ground surface.

  Then, the worker rides on the panel 40 of the working scaffold assembled on the upper side, and performs the work such as binding the hoop bars 122 to the steel reinforcing bars 121, 121,. When the reinforcing bar 121, 121,... And the hoop bar 122 are bound to the ground surface and the assembling work of the reinforcing bar 120 is finished, the concrete is poured into the earth retaining frame 110.

  At this time, by placing the panel 40 again on the bottom bars 10, 20, 30, the operator can get on the panel 40 and check the state of the poured concrete. And when the concrete hardens, a deep foundation is completed.

  In addition, this invention can be variously changed within the range of the technical matter described in the claim, without being limited to the said embodiment. For example, as shown in FIG. 3, the work platform for the foundation foundation does not use the mounting bars 20, 20 and the intermediate bars 30, 30, but supports the panel 40 with only a pair of support bars 10, 10. Also good. In this case, the panel 40 is not divided into units, and is formed with a length of a distance between the pair of support bars 10 and 10. In this case, the pair of support bars 10 and 10 have the fastener 1 fixed to the fixing hole or provided with a separate stopper (not shown) in order to stop each side surface of the panel 40 at the intermediate portion. Is preferred.

  Further, as shown in FIG. 4, the work foundation for the deep foundation does not use the intermediate bars 30, 30 but supports the panel 40 by the pair of support bars 10, 10 and the mounting bars 20, 20. It may be. In this case, the panel 40 may be one or a plurality of panels.

  Further, as shown in FIG. 5, the working foundation for the deep foundation is configured such that the intermediate bars 30, 30 are paired with each other by setting the length of the intermediate bars 30, 30 to the interval between the pair of mounting bars 20, 20. It can be bridged so as to be sandwiched between the loading bars 20 and 20. The mounting bar 20 in this case can have the vertical portion x upward. However, the intermediate bar 30 that is not back-to-back is also placed on the intermediate portion of the support bar 10 in a state where the vertical portion x faces upward and is joined to the vertical portion x of the support bar 10. The units 41, 42, and 43 of the panel 40 are placed on the panel. In this case, although not shown, the three units 41, 42, 43 are placed in the bars 10, 20, 30 even if the intermediate bars 30, 30 are not fixed to the mounting bars 20, 20 by the fastener 1. It is possible to prevent misalignment by being fitted and each side surface being brought into contact with the longitudinal portion x of each bar 10, 20, 30.

  In addition, the working foundation for the deep foundation may not be configured by the L-shaped angles of the bars 10, 20, and 30 but may be configured by a flat plate or a pipe (not shown). However, as for the bar comprised with a pipe, the part to fix is crushed flatly. In any case, in this case, it is preferable to provide each of the bars 10, 20, 30 with a stopper for preventing the panel 40 to be placed from being displaced.

  Further, the working foundation for the deep foundation is bridged so that both ends of the support bars 10 and 10 are in contact with the opposing liner plate 111, whereby the support bars 10 and 10 are restricted from moving in the length direction. Further, the support bars 10 and 10 are restricted from moving in the width direction by the mounting bars 20 and 20 or the placed plate. Accordingly, the support bars 10 and 10 in this case can be fixed on the flange 113 of the liner plate 111 without providing a fixing hole.

  Moreover, in the construction method of the deep foundation, the panel 40 can be operated in the same manner as the reinforcing bar of the deep foundation by leaving it on each of the bars 10, 20, and 30 without using the panel 40 again. Can be made.

  Further, in the construction method of the deep foundation, when the earth retaining frame 110 is constructed while excavating the shaft 100, both end portions of the support bars 10, 10 are sandwiched between the liner plate 111 and the liner plate 111. You can also In this case, the support bars 10 and 10 may be flat plates, or angles that do not have the vertical portion x only in the sandwiched portions.

It is a partial section perspective view showing a 1st embodiment of a work foundation for deep foundations concerning the present invention. It is a top view which shows 1st Embodiment of the work scaffold for deep foundations which concerns on this invention. It is a partial cross section perspective view which shows 2nd Embodiment of the working scaffold for deep foundations which concerns on this invention. It is a partial cross section perspective view which shows 3rd Embodiment of the working scaffold for deep foundations which concerns on this invention. It is a partial cross section perspective view which shows 4th Embodiment of the work scaffold for deep foundations which concerns on this invention. It is a partial cross section perspective view which shows the prior art example which constructs a deep foundation. It is a perspective view which shows the prior art example of a liner plate. It is a partial cross section perspective view which shows the construction method of the deep foundation including the work scaffold for the conventional deep foundation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ......... Fastener 10 ... Support bar 11 ... Fixing hole 20 ... Mounting bar 30 ... Intermediate bar x ......... Vertical part y ...... Horizontal part 40 ... Panel 41, 42, 43 ... Unit 100 ... vertical shaft 110 ... earth retaining frame 111 ... liner plate 113 ... flange 114 ... fastening hole

Claims (9)

A deep foundation that is assembled on the inside of a retaining frame that is constructed by lining up the ridges in a vertical direction along the inner wall of the excavated shaft, with liner plates that have ridges with fastening holes at the top and bottom. A working platform for the foundation,
A pair of separate individual support bars that span the opposite collars of the liner plate, and a panel that is supported by the support bars ,
Of the plurality of fastening holes formed at intervals in the circumferential direction of the flange portion of the liner plate, the four pairs of fastening holes in which the line segments connecting the fastening holes and the fastening holes are in parallel relation are described above. Each of the support bars is provided with a pair of fixing holes that are spaced apart corresponding to the length of the line segment, and the pair of support bars are paralleled by a fastener that is inserted through the corresponding fastening hole and the fixing hole. Working scaffold for deep foundations, characterized by being fixed to the liner plate . A deep foundation that is assembled on the inside of a retaining frame that is constructed by lining up the ridges in a vertical direction along the inner wall of the excavated shaft, with liner plates that have ridges with fastening holes at the top and bottom. A working platform for the foundation,
A pair of separate individual support bars that span the opposite collars of the liner plate, and a panel that is supported by the support bars,
A working foundation for a deep foundation , wherein a pair of mounting bars are spanned on the support bar, and the mounting bar has the same length as the support bar . A deep foundation that is assembled on the inside of a retaining frame that is constructed by lining up the ridges in a vertical direction along the inner wall of the excavated shaft, with liner plates that have ridges with fastening holes at the top and bottom. A working platform for the foundation,
A pair of separate individual support bars that span the opposite collars of the liner plate, and a panel that is supported by the support bars,
Of the plurality of fastening holes formed at intervals in the circumferential direction of the flange portion of the liner plate, the four pairs of fastening holes in which the line segments connecting the fastening holes and the fastening holes are in parallel relation are described above. Each of the support bars is provided with a pair of fixing holes that are spaced apart corresponding to the length of the line segment, and the pair of support bars are paralleled by a fastener that is inserted through the corresponding fastening hole and the fixing hole. Fixed to the liner plate,
Wherein the support bar, a pair of rests bars spans, work scaffolding for caisson foundation characterized in that the placing cover is the same length as the support bar. The panel is divided into a plurality of units;
Intermediate bar 1 or a plurality of supporting the respective units are bridged pair of rests bar, in claim 2 or 3 intermediate bars, characterized in that it is the same length as the support bar Work scaffold for the described foundations.   The said support bar, mounting bar, and / or intermediate | middle bar are comprised by the L-shaped angle which consists of a vertical part and a horizontal part, The any one of Claim 1 thru | or 4 characterized by the above-mentioned. Working scaffold for deep foundation.   6. The working foundation for deep foundations according to claim 5, wherein the support bar and the intermediate bar are bridged in a direction in which the vertical portion blocks the side surface of the panel. A construction method for a deep foundation using a working foundation for a deep foundation according to any one of claims 1 to 6,
A step of providing a retaining frame in which the flanges overlap with each other by continuating a liner plate provided with a flange on the inner wall of the excavated shaft, and a plurality of vertical reinforcing bars in an annular shape inside the retaining frame A step of assembling a scaffold for a deep foundation by bridging a pair of support bars on the flange portion of the liner plate and placing a panel on the support bar; and a hoop bar on the steel bar A method for constructing a deep foundation, comprising a step of assembling a reinforcing bar by binding together and a step of placing concrete in a vertical shaft.   The construction method of a deep foundation according to claim 7, wherein the panels are used in order from the bottom side of the shaft to the ground surface and are not embedded in the placed concrete.   9. A foundation foundation constructed by the construction method of the foundation foundation according to claim 7 or 8.

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