JP4286433B2 - Retaining method using angled pile with variable beam support point position - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of a mountain-clamping method using a diagonal pile as a reaction force, and more particularly, relates to a mountain-clamping method using a diagonal pile in which the support point of a second-stage beam is variable.
[0002]
[Prior art]
Conventionally, for example, Japanese Patent Application Laid-Open No. 7-252835 describes a method of retaining a mountain using an oblique beam with a straight pile as a reaction force. However, it is difficult to deal with the direct pile alone when the earth pressure exceeds the design assumption.
[0003]
Japanese Patent Application Laid-Open No. 2000-45282 describes a mountain-clamping method in which diagonal piles are used as a set pile and the reaction force of the beam is made.
[0004]
The pile-clamping method, which uses this diagonal pile as a group pile and the reaction force of the beam, is characterized by the fact that the diagonal pile mainly generates axial stress and has a small bending moment and shear stress, and is structurally stable.
[0005]
As shown in FIGS. 7 (A) and 7 (B), the mountain retaining method using the diagonal pile as a set pile and the reaction force of the cut beam is shown in FIGS. 7 (A) and 7 (B). When the horizontal force acts toward the intersection of the diagonal piles 2 and 2 heads, even if the excavation is further advanced and the earth pressure of the retaining wall 1 increases from the initial state shown by the broken line, it acts on the diagonal piles 2 and 2. It was expected that the bending moment could be minimized and that the deformation of the diagonal piles 2 and 2 could be accommodated to the extent shown by the solid lines. However, in practice, since a method is used in which the slant piles 2 and 2 are assembled to each other with the connecting member 3 such as a concrete structure, depending on the accuracy error of the assembled pile state and the support ground state, the above-described method is not necessarily used. The bending moment acting on the diagonal piles 2 and 2 is not necessarily minimized, and the diagonal piles 2 and 2 may be greatly deformed as shown in FIGS.
[0006]
Therefore, conventionally, in order to solve the above problem, the following procedures (1) to (4) are performed, and the excavation of the ground is carried out by adjusting to minimize the bending moment acting on the inclined piles 2 and 2. It was.
[0007]
(1) The excavation of the ground is advanced while confirming the generation of the axial force with the stress gauges provided on the inclined piles 2 and 2.
[0008]
(2) When the axial force applied to the slant piles 2 and 2 has measured a predetermined amount of axial force, the excavation of the ground is temporarily stopped, and the hydraulic preload provided on the first-stage cut beam 5 is considerably large. After the axial force is introduced to support the retaining wall, the support point 6a of the second-stage beam 6 is removed from the connecting member 3.
[0009]
(3) A position where a bending moment acting on the inclined piles 2 and 2 is not substantially generated is estimated from the axial force state measured in the procedure of (1) above, and the support point 6a of the second-stage cut beam 6 is fixed at that position. Process and fix.
[0010]
(4) The retaining wall is supported by introducing a considerable axial force by the hydraulic preload provided on the second-stage beam 6.
If necessary, the above procedure is repeated to proceed with excavation of the ground while making adjustments that minimize the bending moment acting on the inclined piles 2 and 2.
[0011]
[Problems to be solved by the present invention]
When adjusting the position of the support point 6a of the second-stage cut beam 6, the mountain retaining wall is supported only by the first-stage cut beam 5, which is a dangerous state.
[0012]
Further, when the axial force applied to the slant piles 2 and 2 reaches a predetermined magnitude and the support point 6a of the second-stage cut beam 6 is adjusted, it is necessary to perform the procedures (1) to (4) above. , Work is complicated and time consuming.
[0013]
Furthermore, since the position where the bending moment is not substantially generated changes depending on the construction conditions of the connecting member 3 and the like as described above, a skilled technique is required to estimate the position, which is not a job that anyone can do.
[0014]
In addition, when the above steps (1) to (4) are performed, the load of the cut beam shifts the support of the retaining wall from the first-stage cut beam 5 to the second-stage cut beam 6, or vice versa. Since the transition is made from the leveling beam 6 to the first level cutting beam 5, an adverse effect is generated on the ground around the inclined piles 2 and 2 and the retaining wall.
[0015]
Therefore, the object of the present invention is to secure the safety of the retaining wall by adjusting the position of the support point of the second-stage beam while maintaining the axial force of the first-stage beam and the second-stage beam. The purpose of the present invention is to provide a mountain pile construction method using slant piles with variable beam support point positions that hardly cause adverse effects on the ground around the mountain retaining wall.
[0016]
The next object of the present invention is that it is not necessary to estimate the position of the support point of the second stage beam, so that no skill is required, and anyone can make a quick and accurate adjustment and shorten the construction period. The purpose of this is to provide a pile retaining method using slant piles with variable beam support point positions.
[0017]
[Means for Solving the Problems]
As a means for solving the problems of the prior art, a pile fixing method using a slant pile with variable beam support point positions according to the invention described in claim 1 is:
In the mountain-clamping method that uses the diagonal pile as the pile and the reaction force of the beam,
Providing a cutting beam support point variable device in the vertical direction on the connecting member of the pile head, and pin-joining the end of the second-stage cutting beam to the beam support point variable device;
The excavation of the ground is carried out while confirming the degree of axial force generated by a stress meter provided on the slant pile, and the axial force of a predetermined magnitude is measured. The support point is adjusted to be close to a position where the bending moment is not substantially generated in the slant pile, and after fixing the position, the fixing process is performed, and then the ground is excavated to the final stage.
[0018]
The invention described in claim 2 is a mountain-clamping method using a diagonal pile in which the beam support point position according to the invention described in claim 1 is variable.
The beam support point variable device is provided by fixing a pedestal having a fixed support on a side surface of a connecting member, and a movable support is provided above or below the fixed support, and a jack or the like is provided between the fixed support and the movable support. The drive means is provided, and the support point of the second stage beam is pin-joined to the movable support, and the position of the movable support is adjusted by the drive means.
[0019]
[Embodiments and Examples of the Invention]
FIG. 1 shows an initial stage of a mountain-clamping method using a diagonal pile with variable beam support point positions according to the invention described in claim 1.
[0020]
In other words, the mountain retaining wall 1 is constructed around the excavation bottom 8 of the ground, and the first excavation of the excavation bottom 8 is performed in such a manner that the slope 9 having an appropriate slope is left on the mountain retaining wall 1 side. A plurality of diagonal piles 2 and 2 are constructed on the excavation bottom 8 of the primary excavation, and the pile heads of the respective diagonal piles 2 and 2 are connected by a connecting member 3 to form a set pile. A first-stage cutting beam 5 is installed between the connecting member 3 and a protuberance 4 a provided on the top of the retaining wall 1, and the retaining wall 1 is supported by the first-stage cutting beam 5. Yes.
[0021]
FIG. 2 shows that after completing the first excavation by excavating the slope 9, the connecting member 3 of the pile pile head is provided with a cutting beam support point varying device 7 in the vertical direction. The end portion of the second-stage cut beam 6 is pin-joined to the variable device 7, and the other end portion is pin-joined to the protuberance 4 b provided in the middle portion of the mountain retaining wall 1 to support the mountain retaining wall 1. Shows the stage.
[0022]
FIG. 3 is a stage in which excavation of the excavation bottom 8 is advanced while confirming the degree of generation of the axial force by a stress meter (not shown) provided in the inclined piles 2 and 2, and the axial force of a predetermined magnitude is measured. The figure shows a stage in which the cut beam support point variable device 7 adjusts the support point 6a of the second-stage cut beam 6 to a position where a bending moment is not substantially generated, and after fixing the position, the fixing process is performed.
[0023]
As shown in FIG. 5, the beam supporting point variable device 7 is provided with a base 7a having a fixed support 7b fixed to the side surface of the connecting member 3, and a movable support 7c provided above the fixed support 7b. The fixed bearing 7b and the movable bearing 7c are connected by a jack 7d as driving means, and the support point 6a of the second-stage cut beam 6 is pin-connected to the movable bearing 7c. The position of the movable support 7c is adjusted by the jack 7d (the invention according to claim 2).
[0024]
In the jack 7d, the lower part of the adjusting bolt 7e is fixed by being passed through the nut 7g of the fixed support 7b, and the upper part is fixed by lock nuts 7f and 7f sandwiching the upper and lower surfaces of the lower surface of the movable support 7c. The back surface of the movable support 7c is configured such that the side surface of the pedestal 7a can be easily slipped by Teflon treatment, painting, or the like.
[0025]
Accordingly, when the second excavation of FIG. 3 proceeds, the earth pressure acting on the retaining wall 1 increases, and the axial force applied to the slant pile 2 reaches a predetermined magnitude, the upper nut 7f is loosened. Then, the lower nut 7f is turned to raise the movable support 7c, and the movable support 7c is moved to a position where the axial force applied to the inclined pile 2 is not substantially generated by the stress meter, and the position of the support point 6a is adjusted. To do. After an appropriate position is determined as a reading of the stress meter, the lock nuts 7f and 7f are firmly tightened to fix the position, and further welded to fix the movable support 7c. Thus, the bending moment acting on the inclined piles 2 and 2 can be minimized, and as shown in FIGS. 6 (A) and 6 (B), even if the earth pressure increases as the second excavation progresses, Deformation of the piles 2 and 2 can be minimized.
[0026]
FIG. 4 shows a stage where the second excavation is further advanced, and the slope 10 is excavated to excavate the excavation bottom 8 to the final stage.
[0027]
The above-described mountain pile fixing method using the inclined piles with variable beam support point positions can advance the adjustment of the support points 6a while maintaining the axial force of the first-stage beam 5 and the second-stage beam 6. Therefore, the safety of the retaining wall can be ensured, and the adverse effects on the surrounding ground of the inclined piles 2 and 2 and the retaining wall 1 are hardly generated.
[0028]
Furthermore, the beam support point varying device 7 can adjust the position of the support point 6a of the second-stage beam 6 only by rotating the lock nuts 7f and 7f, and is accurate by reading the stress meter. Therefore, the operation is simple and does not require a skilled technique, and anyone can adjust the position of the support point 6a quickly and accurately, which contributes to shortening the construction period.
[0029]
In the above embodiment, the case where the support point 6a is moved upward has been shown. However, when the support point 6a is moved downward to adjust, the lower nut 7f is loosened and the upper nut 7f is moved. You can turn and tighten. The subsequent procedure is the same as that when adjusting upward.
[0030]
Moreover, in the said embodiment, although the other edge part of the said 2nd-stage cut beam 6 is pin-joined with the protuberance 4b, it is not restricted to this. That is, the other end portion may be bolted to the flank 4b. In that case, when adjusting the support point 6a, the bolt joint part between the other end part and the protuberance 4b is loosened, and the gap between the bolt and the nut is separated from the gap between the bolt and the nut with respect to the displacement of the support angle of the second-stage cut beam 6. It is better to insert a member.
[0031]
Further, in the above embodiment, the movable support 7c is provided above the fixed support 7b provided on the pedestal 7a, but conversely, a structure in which the movable support 7c is provided below the fixed support 7b can be similarly implemented.
[0032]
In addition, in order to reduce the bending moment acting on the inclined pile 2, the inclined piles 2, 2 may be connected by the connecting material 11.
[0033]
In the embodiment of FIG. 5, the jack 7d is configured by the adjustment bolt 7e and the lock nuts 7f and 7f, but is not limited thereto. It can also be implemented by employing a mechanical jack or a hydraulic cylinder. In short, the configuration is not limited as long as it has means that can be driven in the vertical direction.
[0034]
In the said embodiment, although the connection member 3 is comprised with concrete, what is necessary is just to be able to install the cutting beam support point variable apparatus 7 in a side surface, The material is not limited.
[0035]
In the above embodiment, the pedestal 7 a having the fixed support 7 b is used, but only the fixed support 7 b may be fixed to the side surface of the connecting member 3.
[0036]
In the above-described embodiment, the second excavation is the final stage. However, the third excavation and the fourth excavation are also performed in the same manner. That is, in the embodiment, the adjustment of the support point 6a is performed only once, but the adjustment may be repeated a plurality of times as necessary.
[0037]
[Effects of the present invention]
According to the mountain retaining method using the slant pile with variable beam support point position according to the present invention, the axial force of the first-stage beam and the second-stage beam is maintained while maintaining the axial force of the second-stage beam. Since the adjustment can be advanced, the safety of the retaining wall can be ensured, and there is almost no adverse effect on the surrounding ground of the inclined pile and retaining wall.
[0038]
Furthermore, the cutting beam support point variable device can adjust the position of the support point of the second-stage cutting beam only by rotating the lock nut, and can be accurate by reading the stress meter. Anyone can quickly and accurately adjust the position of the support point, which contributes to shortening the construction period.
[Brief description of the drawings]
FIG. 1 is an elevational view showing an embodiment of a mountain-clamping method using slant piles with variable beam support point positions according to the present invention.
FIG. 2 is an elevational view showing a stage in the middle of excavation of a mountain retaining method using a slant pile with variable beam support point positions according to the present invention.
FIG. 3 is an elevational view showing a stage in the middle of excavation of the mountain-clamping method using a slant pile with variable beam support point positions according to the present invention.
FIG. 4 is an elevational view showing a state in which excavation has progressed to the final stage in the pile retaining method using the inclined piles with variable beam support point positions according to the present invention.
FIG. 5 is a front view showing the detail of the beam supporting point variable device in detail.
FIG. 6A is an elevation view showing the deformation of the slope pile when the mountain retaining wall is supported after adjusting the support point in the mountain pile construction method using the slope pile. B is an analysis diagram of A. FIG.
FIG. 7A is an elevation view showing deformation of a slant pile expected in a conventional mountain pile method using slant piles. B is an analysis diagram of A. FIG.
FIG. 8A is an elevational view showing deformation of a diagonal pile when a mountain retaining wall is actually supported in a conventional method of mountain retaining with a diagonal pile. B is an analysis diagram of A. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Mountain retaining wall 2 Diagonal pile 3 Connecting member 4a, 4b Raising 5 1st stage beam 6 2nd stage beam 5a, 6a Supporting point 7 Cutting beam supporting point variable device 7a Base 7b Fixed bearing 7c Movable bearing 7d Jack 8 Bottom of excavation

Claims (2)

In the mountain-clamping method that uses the diagonal pile as the pile and the reaction force of the beam,
Providing a cutting beam support point variable device in the vertical direction on the connecting member of the pile head, and pin-joining the end of the second-stage cutting beam to the beam support point variable device;
The excavation of the ground is carried out while confirming the degree of axial force generated by a stress meter provided on the slant pile, and the axial force of a predetermined magnitude is measured. Adjusting the support point closer to a position where bending moment does not substantially occur in the slant pile, fixing the position after determining the position, and then excavating the ground to the final stage A mountain-clamping method with slant piles that can be made variable. The beam support point variable device is provided by fixing a pedestal having a fixed support on a side surface of a connecting member, and a movable support is provided above or below the fixed support, and a jack or the like is provided between the fixed support and the movable support. 2. The beam according to claim 1, wherein the driving means is provided, and a support point of a second-stage cutting beam is pin-connected to the movable bearing, and the position of the movable bearing is adjusted by the driving means. A mountain-clamping method using slant piles with variable support point positions.

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