JP3670240B2 - How to raise the earth wall - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for raising a retaining wall, and as a typical example, relates to a method for raising a retaining wall which is preferably implemented in civil engineering work in which a vertical hole is excavated in the ground and a structure such as concrete is constructed in the vertical hole.
[0002]
[Prior art]
As shown in FIGS. 1A and 1B, when a vertical hole 1 is excavated in the ground and a concrete structure 3 rising from the base foundation 2 to the ground is built in the vertical hole 1, a sheet pile 4 is driven into a square as shown in FIG. 1A. A rectangular cylinder-shaped retaining wall 5 is formed, and, as shown in FIG. 1B, a vertical hole 1 is formed by excavating the rectangular cylindrical retaining wall 5, and the concrete structure rising to the ground in the vertical hole 1 3 is built. This method is often used in the construction of piers that support bridges.
[0003]
On the other hand, as a means for reinforcing the anti-soil pressure of the square cylindrical retaining wall 5, as shown in FIG. 1A, a bellows member 6 made of H-shaped steel is provided along the inner surface of each side of the square cylindrical retaining wall 5. In addition to laying horizontally, a cross beam 7 made of H-shaped steel that crosses the inside of the vertical hole 1 and intersects with each other is arranged to support the stretched member 6 in a stretched manner.
[0004]
As shown in FIG. 1B, the assembly of the bellows member 6 and the cut beam 7 is arranged in multiple stages according to the depth of the vertical hole 1 (the underground height of the retaining wall 5). The required anti-earth pressure is obtained by distributing the beams 7 vertically and horizontally.
[0005]
[Problems to be solved by the invention]
Thus, in the conventional erection method, that is, the earth retaining method, since the cut beam 7 crossing the vertical hole 1 exists vertically and horizontally, the lower cut beam 7 and the erection material 6 assembly are sequentially removed and backfilled. And reinforce and reinforce the concrete, and step up the concrete step by step to construct the concrete structure 3 of the required height, which results in excessive construction time and cost. It was.
[0006]
In addition, since it is an erection method in which reinforcing bars are assembled and concrete is struck, it becomes a cause of impairing the reliability of the strength of the concrete structure 3.
[0007]
In addition, the construction work of the above-mentioned urging member 6 and the beam 7 is excessively laborious and costly.
[0008]
[Means for Solving the Problems]
The present invention eliminates the erection structure by the erection material 6 and the beam 7 and forms the erection structure appropriately and easily. Therefore, the above problems caused by the conventional erection structure are drastically solved.
[0009]
The present invention provides, as a basic idea, a structure for raising an earth retaining wall by cooperation of an arc-shaped bell-raised material and a hydraulic screw-type jack having both a hydraulic cylinder structure and a screw-type jack structure .
[0010]
The method of raising the earth retaining wall includes the following a to h.
a. A large number of sheet piles are driven into a circular shape to form a cylindrical retaining wall, and a vertical hole is excavated in the cylindrical retaining wall.
b. A hydraulic screw type jack in which one end of the cylinder rod is hermetically slipped into the cylinder, a male screw is engraved on the outer peripheral surface of the other end protruding from the cylinder, and a stopper flange is screwed to the male screw is used. ,
c. A plurality of arc-shaped flank members are annularly arranged along the inner peripheral surface of the cylindrical earth retaining wall, and the earth retaining wall is supported by the convex-side arc surface of each arc-shaped lining material.
d. The hydraulic screw jack is interposed between the ends of the arc-shaped flank members,
e. By supplying hydraulic pressure into the hydraulic chamber of the cylinder, the cylinder rod is extended to give a constant axial force to the arc-shaped flank material by a certain amount of extension, and the convex side of each arc-shaped flank material Causing anti-soil pressure in the convex direction on the arc surface,
f. Check with a pressure gauge that a certain axial force has been applied by the hydraulic screw jack.
g. In the state where the constant axial force is applied, the stopper flange is screwed along the cylinder rod and seated on the end surface of the cylinder to prevent the cylinder rod from contracting, thereby maintaining the extension of the cylinder and the circular arc. Maintains a constant axial force applied to the flank
h. After blocking the cylinder rod by the stopper flange, the hydraulic pressure in the hydraulic chamber is extracted and released.
[0011]
The hydraulic screw-type jack is allowed to remain in an axially applied state until the arc-shaped erection material is removed. Alternatively, the hydraulic screw-type jack is removed by interposing a spacer that holds the axial force of the hydraulic screw-type jack between the ends of the arc-shaped bell-raised material.
[0012]
Or between the ends of the arcuate wale material was connected by a connecting joint which holds the axial force by the hydraulic type screw jack to remove the hydraulic type screw jack.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described with reference to FIGS. 2-7.
[0014]
As described above, the subject of the present invention is to provide an earth retaining method by cooperating the arc-shaped bell-raised material 8 and the jack 9 by eliminating the bell-raised structure by the bell-raised material and the cut beam in the conventional earth retaining method. .
[0015]
2 and 3 show first and second embodiments in which this is embodied in a vertical hole excavation work for starting up a concrete structure. As shown in the figure, the earth retaining wall 5 is formed in a cylindrical shape, A vertical hole (cylindrical vertical hole) 1 is excavated in the cylindrical retaining wall 5.
[0016]
Along with the progress of the vertical hole excavation, a plurality of arc-shaped urging members 8 made of H-section steel or the like are arranged annularly and horizontally along the inner peripheral surface of the cylindrical earth retaining wall 5 that defines the vertical hole 1. That is, a plurality of arc-shaped urging members 8 are arranged in an annular shape on a circular locus centering on the center of the vertical hole 1, and the earth retaining wall 5 is formed on the convex curved side arc surface of each arc-shaped urging member 8. Support.
[0017]
An axial force w1 from the jack 9 is applied to one end or both ends of the arc-shaped bulging member 8 to cause the anti-soil pressure w2 in the convex bending direction on the convex-side arc surface to be generated on the anti-protruding member 8. The earth pressure w2 is applied to the cylindrical earth retaining wall 5 to obtain strength against the earth pressure w3. The axial force w <b> 1 is a compressive force applied to the arcuate axis of the arcuate raising member 8.
[0018]
For example, as shown in FIG. 2A, the cylindrical retaining wall 5 is arranged in a single circle (perfect circle), and a circle (inscribed circle) along the inner peripheral surface of the cylindrical retaining wall 5 is formed into a plurality of arcs. Abdomen is received by a plurality of arc-shaped erection members 8 of equal length to be divided.
[0019]
Further, as shown in FIG. 3A, the cylindrical retaining wall 5 is formed into a composite cylindrical shape in which two or more arcs (dominant arcs) having substantially the same curvature are joined, and the composite cylindrical retaining wall 5 is formed. A single compound circle (inscribed compound circle) along the inner peripheral surface of the two is bent by a plurality of arc-shaped erection members 8 that are divided into a plurality of arcs.
[0020]
As shown in FIG. 2B and FIG. 3B, the above-mentioned flank structure by the arc-shaped flank member 8 and the jack 9 is assembled in upper and lower stages depending on the depth of the vertical hole 1.
[0021]
Each of the arc-shaped raising members 8 and the cylindrical retaining wall 5 made of a single circle or a compound circle have substantially the same curvature, and each of the arc-shaped raising members 8 has a convex arcuate surface. In a substantially full length, the inner circumferential surface of the cylindrical earth retaining wall 5 is in intermittent contact or continuous contact in a free contact state.
[0022]
The cylindrical earth retaining wall 5 is formed by driving a large number of sheet piles 4 into a circle, and forms a bellows raising structure by the cooperation of the arc-shaped belly raising member 8 and the jack 9.
[0023]
As shown in FIG. 7 , the commonly used sheet pile 4 is formed by bending the side plate 4b from the left and right side ends of the top plate 4a in the longitudinal direction to form a U-shaped channel, and hook-type joints 4c are provided at the ends of the left and right side plates 4b. A bent shape is formed, and the earth retaining wall 5 is formed between the adjacent sheet piles 4 by driving into the ground while assembling the hook-shaped joint 4c in the hands of the phases.
[0024]
Each of the sheet piles 4 can be rotated around the hand-assembled portion of the phase of the hook-shaped joint 4c, and an arc-shaped or cylindrical earth retaining wall 5 is constructed using this.
[0025]
When the earth retaining wall 5 is constructed by the sheet pile 4 as shown in FIG. 7 , the arc-shaped bell-raised member 8 intermittently contacts the top plate 4 a of the sheet pile 4.
[0026]
As shown in FIGS. 2A and 3A, a jack 9 is interposed between the end portions of each arc-shaped urging member 8, and the adjacent arc-shaped urging members 8 are connected to each other by extension of the jack 9. Applying an axial force w1 in the opposite direction to give an axial force w1 to the all-arc-shaped erection material 8 so that the anti-soil pressure in the convex direction in the entire length of the convex-side arc surface of each arc-shaped erection material 8 w2 is generated, and this anti-soil pressure w2 is applied to the cylindrical earth retaining wall 5 to obtain strength against the earth pressure w3.
[0027]
As shown in FIG. 2B and FIG. 3B, the above-mentioned assembly of the arc-shaped bell-raised member 8 and the jack 9 is arranged in multiple vertical stages depending on the depth of the vertical hole 1 (the underground height of the retaining wall 5). The anti-soil pressure w2 is obtained.
[0028]
2 and 3, as shown in the drawings, the vertical hole 1 defined by the cylindrical retaining wall 5 is completely opened to bring in building materials and the concrete structure 3 as in the conventional example. Therefore, an appropriate anti-soil pressure w2 can be obtained without generating an obstacle that hinders the construction. Therefore, unlike the conventional example, it is possible to construct the structure 3 by constructing the reinforcing bars at the height required for the concrete structure 3 and driving the concrete first, without performing the reinforcement of the reinforcing bars and the concrete.
[0029]
After the concrete structure 3 is constructed, the assembly of the arc-shaped bell-raised member 8 and the jack 9 may be sequentially carried out while being sequentially removed from the lower stage to the upper stage.
[0030]
When constructing a composite cylindrical retaining wall 5 by driving a large number of sheet piles 4 shown in FIG. 3, a pressure receiving member 11 ′ such as a column made of a steel material is arranged at each connecting portion of both cylindrical retaining walls 5. In other words, the pressure receiving member 11 ′ is located between the end of the end flank 8 of one cylindrical retaining wall 5 and the end of the end arch ridge 8 of the other cylindrical retaining wall 5. The end arc-raised member 8 is supported on the opposing side surfaces of the pressure receiving member 11 '.
[0031]
Further, as shown in FIG. 3, a cross beam 7 'is horizontally provided between the pressure receiving members 11' arranged at the respective connecting portions facing each other, and both the pressure receiving members 11 'are stretched and supported between the two connecting portions.
[0032]
In the embodiment shown in FIGS. 2 and 3 described above, the arcuate raising member 8 is provided on the opposite side of the earth retaining wall 5 from the earth retaining side, and the earth retaining is performed on the convex arc surface. The wall 5 is supported, and an axial force w1 by a jack 9 is applied to the arc-shaped bell-raised member 8 from the end thereof, thereby generating an anti-soil pressure w2 in the convex direction on the convex-side arc surface. It includes the erection structure of the earth retaining wall as a basic idea.
[0033]
The jack 9 used in each of the above embodiments is left in a state where the axial force w1 is applied until the arc-shaped erection material 8 is removed. Alternatively, as shown in FIG. 4 , the jack 9 is removed by interposing a spacer 12 that holds the axial force w <b> 1 by the jack 9 in the gap between the ends of the arc-shaped erection material 8.
[0034]
Alternatively, as shown in FIG. 5 , the jacks 9 are removed by connecting the ends of the arc-shaped erection members 8 with a connecting joint 13 that holds the axial force w <b> 1 by the jacks 9. For example, the jack 9 is removed by connecting the end side surface of one arcuate flank member 8 adjacent to the other side surface of the other arcuate flank member 8 with a connecting joint 13 made of a flat steel plate. To do.
[0035]
As shown in FIGS. 2 and 3, the jack 9 is interposed between the end faces of the adjacent arc-shaped protuberances 8, or as shown in FIG. 4 , the adjacent one and the other arc-shaped antinodes. A bracket 19 projecting upward or upward and downward is attached to each end portion of the raising member 8, and the jack 9 is interposed between the brackets 19. FIG. 4 shows both the case where the jack 9 is left during the construction period and the case where the jack 9 is removed by being connected by the spacer 12 or the connecting joint 13.
[0036]
The screw jack is a hydraulic type screw jack suitability capable of fixing the extended or retracted position by screwing the telescopic hydraulically shown in FIG.
[0037]
The jack having the fluid pressure cylinder structure forms a soft pressurizing structure having buffering properties, whereas the screw jack is a rigid pressurizing structure having no buffering properties.
[0038]
The above-mentioned screw-type jack is a jack in which a cylinder and a cylinder rod are screwed together, and has a structure in which the cylinder rod rotates (extends) or retreats (shrinks) by rotating the cylinder rod. An axial force w1 is applied to the belly raising member 8, and the axial force w1 is held by screwing of the female screw and the male screw.
[0039]
The screw-type jack is a rigid pressure structure as described above, has excellent pressure resistance against the large axial force w1, can always maintain a constant tension force, and can easily set the tension force according to the tension position. Is aptitude.
[0040]
As shown in FIG. 6 A, B in the present invention, a jack 9 having both hydraulic cylinder structure and screw jack structure. In this jack 9, one end of a cylinder rod 14 is airtightly fitted in a cylinder 15, a male screw is formed on the outer peripheral surface of the other end protruding from the cylinder 15, and a stopper flange 16 is screwed into the male screw. The cylinder 15 is provided with a hydraulic pressure supply port 18 for supplying hydraulic pressure into a hydraulic chamber 17 formed in the lower surface of the cylinder rod 14 at the bottom of the cylinder 15.
[0041]
Then, by supplying hydraulic pressure through the hydraulic pressure supply port 18, the cylinder rod 14 is extended to give a constant axial force w <b> 1 to the arc-shaped erection material 8 with a constant extension amount.
[0042]
Next, it is confirmed by a pressure gauge that the constant axial force w1 has been applied, and the stopper flange 16 is screwed along the cylinder rod 14 and seated on the end surface of the cylinder 15 in a state where the axial force w1 is applied. . Therefore, the contraction of the cylinder rod 14 is prevented, the extension is maintained, and the constant axial force w <b> 1 applied to the arcuate flank member 8 is maintained.
[0043]
After the cylinder rod 14 is prevented from being screwed out by the stopper flange 16 and kept in the extended state, the hydraulic pressure in the hydraulic chamber 17 is extracted and released through the hydraulic pressure supply port 18. Thereafter, the axial force w1 for the arc-shaped erection material 8 is maintained by the threaded cylinder rod 14.
[0044]
The first and second embodiments shown in FIGS. 2 and 3 are extremely effective for construction work of an overpass such as a highway or a bridge pier such as a river bridge.
[0045]
【The invention's effect】
According to the present invention, the bellows which gives an appropriate anti-soil pressure to the retaining wall by the cooperation of the arc-shaped bell-raised material and the jack without using the bell-raised structure by the bell-raised material and the cut beam in the conventional example as a whole. Can provide a wake-up method .
[0046]
In addition, when a concrete structure is launched by excavating a vertical hole, the vertical hole defined by the retaining wall is completely opened to generate obstacles that impede the construction material construction and the construction of the concrete structure as in the conventional example. Without this, an appropriate anti-soil pressure can be obtained.
[0047]
Therefore, unlike the conventional example, it is possible to construct the same structure by placing the reinforcing bars at the height required for the concrete structure without placing additional reinforcing bars or concrete, and driving concrete into the primary structure, improving the reliability. It is possible to achieve the labor saving of construction and to achieve a significant reduction in construction period and construction cost.
[Brief description of the drawings]
FIG. 1A is a plan view for explaining a bellows structure in a conventional earth retaining wall, and B is a longitudinal sectional view thereof. FIG.
FIG. 2A is a plan view showing a first embodiment of a bellows structure in a retaining wall according to the present invention, and B is a longitudinal sectional view thereof. FIG.
FIG. 3A is a plan view showing a second embodiment of a bellows raising structure in a retaining wall according to the present invention, and B is a longitudinal sectional view thereof.
FIG. 4 is a side view showing an example in which the axial force by the jack in the above-mentioned erection structure is held by a spacer.
FIG. 5 is a plan view showing an example in which an axial force by a jack in the above-mentioned erection structure is held by a coupling joint.
FIG. 6 is a cross-sectional view showing a jack used in the bellows raising structure in the retaining wall, A showing an extended state of the jack, and B showing a state in which the extended state is maintained.
FIG. 7 is a plan view showing an example in which a sheet pile forming a retaining wall is used as a combination.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Vertical hole, 2 ... Base foundation, 3 ... Concrete structure, 4 ... Sheet pile, 4a ... Top plate of sheet pile, 4b ... Left and right side plate of sheet pile, 4c ... Hook-type joint of sheet pile, 5 ... Earth retaining wall, 7 '... Cut beam , 8 ... Arc-shaped flank, 8 '... Auxiliary flank, 9 ... Hydraulic screw jack, 10 ... Bundle material, 11' ... Pressure-receiving member, 12 ... Spacer, 13 ... Connection joint, 14 ... Cylinder rod 15 ... Cylinder, 16 ... Stopper flange, 17 ... Hydraulic chamber, 18 ... Hydraulic supply port, 19 ... Bracket, w1 ... Axial force, w2 ... Anti earth pressure, w3 ... Earth pressure

Claims (3)

A method for raising the retaining wall comprising the following a to h.
a. A large number of sheet piles are driven into a circular shape to form a cylindrical retaining wall, and a vertical hole is excavated in the cylindrical retaining wall.
b. A hydraulic screw type jack in which one end of the cylinder rod is hermetically slipped into the cylinder, a male screw is engraved on the outer peripheral surface of the other end protruding from the cylinder, and a stopper flange is screwed to the male screw is used. ,
c. A plurality of arc-shaped flank members are annularly arranged along the inner peripheral surface of the cylindrical earth retaining wall, and the earth retaining wall is supported by the convex-side arc surface of each arc-shaped lining material.
d. The hydraulic screw jack is interposed between the ends of the arc-shaped flank members,
e. By supplying hydraulic pressure into the hydraulic chamber of the cylinder, the cylinder rod is extended to give a constant axial force to the arc-shaped flank material by a certain amount of extension, and the convex side of each arc-shaped flank material Causing anti-soil pressure in the convex direction on the arc surface,
f. Check with a pressure gauge that a certain axial force has been applied by the hydraulic screw jack.
g. In the state where the constant axial force is applied, the stopper flange is screwed along the cylinder rod and seated on the end surface of the cylinder to prevent the cylinder rod from contracting, thereby maintaining the extension of the cylinder and the circular arc. Maintains a constant axial force applied to the flank
h. After preventing the cylinder rod from being screwed out by the stopper flange, the hydraulic pressure in the hydraulic chamber is extracted and released.
A method of raising the earth retaining wall, characterized by that. 2. The hydraulic screw-type jack is configured to be removed by interposing a spacer for holding an axial force of the hydraulic screw-type jack between ends of the arc-shaped bell-raised material. How to upset the retaining wall. 2. The hydraulic screw-type jack is configured to be connected by connecting joints that hold axial forces of the hydraulic screw-type jack between ends of the arc-shaped bell-raised material. The method of raising the retaining wall as described.

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