JPH0734451A - Structure of underground wall - Google Patents

Abstract

PURPOSE:To reduce cost by partially increasing the wall thickness in the longitudinal direction of an underground wall and inserting a core member having a large 'beam depth', and reducing the wall thickness at other parts. CONSTITUTION:Under the ground, a pillar row wall 21 is constituted by continuously arranging pillar bodies 20 in one row so that each part of the contiguous pillar bodies 20 are superposed on the plane view. A spreading pillar body 22 is formed so as to be positioned on the line crossing at right angle with the pillar row wall 21, passing through the center of the arbitrary pillar body 20 only on one surface side of the pillar row wall 21 and allow a part to be superposed on the plane view with the pillar body 20. A wide width pillar body part 23 is constituted of the spreading pillar body 22 and the pillar body 20 superposed with the pillar body 22. A core member 24 having the longer length in the width direction on the horizontal sectional surface than the diameter of the pillar body 20 is inserted into the wide width pillar body part 23. Then, the high strength can be developed with the core member 24 having the large length in the width direction of the horizontal sectional surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of underground walls such as earth retaining walls and water blocking walls.

[0002]

2. Description of the Related Art Conventionally, as an underground wall such as an earth retaining wall or a water blocking wall, as shown in FIG.
0 forms a column row wall 21 continuously arranged in a line so that parts of the column bodies 20 adjacent to each other overlap each other in a plan view. The core material 26 made of H-shaped steel was inserted to form the underground wall.

By the way, the underground wall such as the earth retaining wall and the water blocking wall must have a strength capable of resisting the earth pressure and water pressure on the back side during underground excavation. For example, in the case of earth retaining walls, it is generally considered as a vertical beam material that uses supporting points such as cutting beams and upsets as fulcrums. In the case of underground walls such as soil cement, stress-bearing materials such as H-type steel are used. It is usual that the core material 26 is inserted. And, the larger the "beam formation" of the beam material, the more advantageous the cross-sectional resistance per unit amount.
When H-shaped steel is used as the core material 26, the longer the web length, the larger the resistance per unit weight. Therefore, as the depth of underground excavation becomes deeper, an underground wall having a large wall thickness is required, and there is a problem that forming an underground wall having a large wall thickness significantly increases the cost.

Further, if deep excavation is to be performed with an underground wall having a small wall thickness, it is necessary to densely use a core material 26 having a small "beam formation", and a material having a small resistance force per unit weight. It is uneconomical to use a large amount of. Further, when a large strength is required, the required strength may not be exhibited even if the core material 26 is densely used in an underground wall having a small wall thickness.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the conventional example, and an object thereof is to partially increase the wall thickness in the longitudinal direction of the underground wall. In addition, a core material having a large "strength" can be inserted, and the other portions are provided with a structure of the underground wall in which the wall thickness can be reduced to reduce the cost.

[0006]

In order to solve the problems of the above-mentioned conventional examples and to achieve the object of the present invention, in the present invention, the pillars 20 are partly adjacent to each other in the ground. A pillar row wall 21 is continuously arranged in a line so as to overlap each other in a plan view, and the pillar row wall 21 passes through the center of an arbitrary pillar body 20 only on one side of the pillar row wall 21. The expansion columnar body 22 is formed so as to be located on a line orthogonal to 21 and partially overlap with the columnar body 20 in a plan view.
The wide column body portion 23 is configured by 2 and the column body 20 that overlaps with this, and a core material 24 having a horizontal section whose length in the width direction is longer than the diameter of the column body 20 is inserted into the wide column body portion 23. It is characterized by being formed.

Further, a large number of pillars 2 constituting the pillar row wall 21.
The column body 20 that does not overlap the column body 22 for enlargement
It is also preferable to insert a core member 25 having a width in the horizontal direction shorter than the diameter of the core member. It is also preferable that the column row wall 21 and the columnar body 22 for expansion are made of a mixture of the soil of the original ground and the consolidation liquid.

[0008]

According to the present invention having the above-described structure, however, it is located only on one side of the column wall 21 and is located on a line which passes through the center of any column 20 and is orthogonal to the column wall 21. Pillar 2
The columnar body for expansion 22 is formed so as to partially overlap with 0 in a plan view, and the columnar body for expansion 22 and the columnar body 20 overlapping with the columnar body for expansion 22 constitute a wide columnar body portion 23. The column 20 in the part 23
By inserting the core member 24 having a horizontal section whose length in the width direction is longer than the diameter of the column body 2 inserted in the wide column body portion 23.
A core material 24 having a horizontal cross section whose length in the width direction is larger than the diameter of 0
(In other words, a core material with a large "strength") can be used to develop high strength, and a core material with a large "strength" is used as compared to the case where a core material with a small "strength" is densely used. As a result, the cost of the core material can be reduced, and further, the portion of the underground wall other than the wide columnar portion 23 is narrow, and the construction cost of the underground wall can be saved. Then, in providing a part where the wall thickness is partially thick in the underground wall in this way, it is positioned on a line orthogonal to the pillar row wall 21 passing through the center of any pillar body 20 only on one side of the pillar row wall 21. In addition, by forming the expansion columnar body 22 so as to partially overlap the columnar body 20 in a plan view, the other side of the column row wall 21 where the expansion columnar body 22 does not project is excavated underground. By being on the side,
When excavating the inside of the underground wall, the wide columnar portion 23 does not hinder the underground excavation work.

In addition, among the many pillars that form the pillar row wall 21, the pillar 20 that does not overlap with the enlargement pillar 22 is included in the pillar 20.
By inserting the core material 25 having a horizontal cross section whose length in the width direction is shorter than the diameter of the core wall, the strength of the underground wall is further improved, and the underground wall having high strength can be obtained. In addition, when the column row wall 21 and the expansion column 22 are made of a mixture of the soil of the original ground and the consolidation liquid, vibration is generated after the completion of construction as compared with the case where the core material is inserted into the concrete. By giving it, it is possible to relatively easily pull out the core material having a large "beam formation" to the ground, and it is possible to reuse the core material having a large beam formation.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings. FIG. 1 shows a horizontal sectional view of an embodiment of the underground wall of the present invention. In the figure, reference numeral 20 denotes a pillar body formed in the ground, and the pillar body walls 2 are continuously arranged in a line so that parts of the pillar bodies 20 adjacent to each other overlap each other in a plan view.
1 is configured, is located on a line orthogonal to the column row wall 21 passing through the center of any column body 20 on only one side of the column row wall 21, and a part of the column body 20 in plan view. Enlarging columns 22 are formed so as to overlap each other. And the column body 2 for expansion
The wide columnar body portion 23 is configured by 2 and the columnar body 20 overlapping this. As described above, the underground wall of the present invention has the wide columnar portion 23.
One part has a thick wall and the other part has a thin wall. A core material 24 (that is, a core material having a large “beam forming”) having a horizontal section whose length in the width direction is longer than the diameter of the column body 20 is inserted into the wide column body portion 23.

The underground wall of the present invention having the above-mentioned structure is formed by using, for example, the apparatus shown in FIGS. In this device, as shown in FIGS. 2 to 5, an elevating body 12 is vertically movable along a reader 7 provided on a traveling device 6 such as a crawler crane. The axis device 10 is provided, and the multi-axis device 10 has four
The upper end of the rotary shaft 1 of the book is attached. The four rotary shafts 1 are rotated via the multi-axis device 10 by rotating the rotary device 13. Two of the four rotary shafts 1 are in the same direction, and the other two rotary shafts 1 are in the same direction. Is designed to rotate in the opposite direction. Of the four rotary shafts 1, three rotary shafts 1 are arranged side by side so that their axes are aligned in a straight line, and the remaining one rotary shaft 1b is the three rotary shafts 1 arranged in a line. Rotating shaft 1
Among them, the center is located on a line that passes through the central axis of the rotary shaft 1a and is orthogonal to the line that connects the central axes of the three rotary shafts 1, and the four rotary shafts 1 are plan view. Are arranged in a substantially T shape.

Here, a bit serving as the excavating means 5 is provided at the lower end of each rotary shaft 1. The rotation trajectories drawn by the adjacent excavation means 5 are set so as to partially overlap each other in a plan view, and therefore, the adjacent excavation means 5 are displaced from each other in the vertical direction. Out of the three rotary shafts 1 arranged in a straight line, the rotary shafts 1c and 1d on both sides
The level of the excavation means 5 provided at the lower end of the
It is located below the level of the excavating means 5 provided at the lower end of a, and the level of the excavating means 5 provided at the lower end of the fourth rotating shaft 1b is set at the lower end of the central rotating shaft 1a. It is located below the level of the excavation means 5 provided.
That is, the excavating means 5 provided at the lower ends of the rotary shafts 1b, 1c, 1d is located below the lower end of the excavating means 5 provided at the lower end of the rotary shaft 1a, and the rotary shafts 1b, 1c,
The excavation means 5 provided at the lower end of 1d are at the same level.

An arbitrary rotary shaft 1 (4
The whole rotary shaft 1 may be provided, or 1 or 2 or 3 rotary shafts 1 may be provided), and a consolidating liquid ejecting portion (not shown) for ejecting a consolidating liquid such as cement milk is provided on the whole. Provided (this consolidating liquid discharger may be provided directly on the rotary shaft 1,
Alternatively, it may be provided on the excavation means 5 provided on the rotating shaft 1). Further, the rotating shaft 1 is provided with a stirring means 4 such as a screw portion or a blade at any position in the vertical direction. Here, the rotation locus of the stirring means 4 provided on the central rotating shaft 1a of the three rotating shafts 1 arranged in a line and the remaining three rotating shafts 1 of the four rotating shafts 1 are provided. The rotation loci of the stirring means 4 partially overlap each other in plan view. Therefore, the agitating means 4 adjacent to each other laterally are arranged vertically offset from each other.

The four rotary shafts 1 are connected by a connecting device 2. As shown in FIG. 2, the coupling device 2 has a substantially T-shape in plan view and is provided with four bearing portions 3. Three of the four bearing portions 3 are arranged in a line, and the remaining one is
One bearing portion 3 is located on a line orthogonal to the line connecting the shaft cores of the three bearing portions 3 and passing through the shaft core of the central bearing portion 3, and each of the four bearing portions 3 is 4 The four rotary shafts 1 are rotatably supported by being fitted into one rotary shaft 1. The connecting device 2 holds the four rotary shafts 1 arranged in a substantially T shape in a plan view.

The underground wall of the present invention is formed by using the device in which the four rotary shafts 1 are arranged in a substantially T-shape as described above. That is, while excavating the ground by the excavating means 5 while rotating the four rotary shafts 1, the consolidating liquid is discharged from the consolidating liquid discharging portion such as cement milk, and the stirring means 4 solidifies the excavated earth and sand. The binder solution is mixed and stirred to form a first excavation hole 9a having a substantially T shape in plan view in which four holes 8 are arranged in a substantially T shape in plan view, as shown in FIG. 6 (a). At the same time, the agitated mixture 10 of excavated soil and congealing liquid is filled in the excavation hole, and then, as shown in FIG.
Similarly, four holes 8 are formed next to each other at a constant interval in a substantially T-shape in plan view to form a second excavation hole 9b having a substantially T-shape in plan view and the second drilling hole 9b is formed. The excavated hole 9b is filled with a stirring mixture 10 of excavated earth and sand and a consolidating liquid, and then the first mixture
When starting the excavation of the unexposed portion between the excavation hole 9a and the second excavation hole 9b, the rotary shafts located at both ends of the three rotary shafts 1 arranged in a line out of the above four rotary shafts 1 The excavation means 5 at the lower end of 1 is simultaneously inserted into the hole 8 at the end of the first excavation hole 9a and the hole 8 at the end of the second excavation hole 9b, and excavation is started using this as a guide. is there. In this way, the third excavation hole 9c is formed as shown in FIG. 6C, and the rotary shafts 1a and 1b are used to remove the second excavation hole 9c between the first excavation hole 9a and the second excavation hole 9b. The two holes 8 and 8 ′ are formed so as to partially overlap each other in a plan view, and this portion is filled with the agitated mixture 10 of the excavated earth and sand and the consolidation liquid.
Similarly, as shown in FIG. 6 (d), the next excavation hole is formed next to the second excavation hole 9b at regular intervals, and the unexcavated portion is further excavated in the same manner. By doing so, the holes 8 are continuous in the lateral direction (left-right direction) in a state where they partially overlap with each other in plan view, and holes 8'are formed behind each other hole 8 in plan view. In addition, in this row of 8 holes and holes 8 '
A columnar body 20 such as a soil cement column is formed in each hole 8 portion by filling and hardening an agitated mixture 10 of excavated soil and a congealing liquid, and a columnar body 22 for expansion in the hole 8 '.
Is formed. The pillars 20 such as soil cement pillars formed in the holes 8 are continuously arranged in a line so that parts of the pillars 20 adjacent to each other overlap each other in a plan view. The wall 21 is configured, and the expansion column 2
2 has an adjacent columnar body 20 partially overlapped with each other in a plan view, and the widening columnar body portion 23 is configured by the enlargement columnar body 22 and the columnar body 20 overlapping this. On the other hand, in the wide column body portion 23, a core material 24 having a horizontal section whose length in the width direction is longer than the diameter of the column body 20 is inserted in the uncured state.

In the above embodiment, an example in which the underground wall of the present invention is formed by using the apparatus shown in FIGS. 2 to 5 is shown, but the invention is not necessarily limited to the one constructed by the above apparatus. It is also possible to use a single-axis excavator or a multi-axis excavator in which a plurality of excavating shafts are arranged in a line. By the way, in the present invention, the pillars 22 for expansion are formed so as to be on the side opposite to the side where the excavation work is performed (that is, the side A in FIG. 1 is the side where the excavation work is performed). As a result, when the excavation work is performed on the A side, the excavation work can be performed without being disturbed by the expansion columnar body 22.

FIG. 7 shows another embodiment of the present invention. In this embodiment, the wide columnar body portion 23 is provided with the columnar body 20.
In addition to inserting the core material 24 (that is, the core material having a large “beam forming”) whose horizontal cross section has a length in the width direction larger than the diameter of
Among the many pillars 20 that form the pillar row wall 21, the pillar 20 that does not overlap the expanding pillar 22 has a core material 25 whose horizontal cross-section has a shorter length in the width direction than the diameter of the pillar 20 (that is, “ Hariari ”
In the example, a core material having a small diameter is inserted. In this embodiment, greater strength can be exhibited.

Further, in the above-described embodiment shown in FIGS. 1 and 7, an example in which the wide columnar body portion 23 is formed by overlapping the alternate columnar body 20 of the multiple columnar bodies 20 with the expansion columnar body 22. However, as shown in FIGS. 8 (a) and 8 (b), the columnar bodies 22 for expansion may be overlapped with every two columnar bodies 20 among a large number of columnar bodies 20, or at any necessary location. The wide column body portion 23 may be formed by overlapping the column body 20 for enlargement with the column body 20.

In the present invention, if the column wall 21 and the expansion column 22 are made of a mixture of the soil of the original ground and the consolidation liquid, vibration may be applied after the completion of construction. It is possible to relatively easily pull out a core material with a large "beam formation" to the ground, and to reuse a core material with a large "beam formation".

[0020]

According to the present invention, as described above, the pillars are continuously arranged in a line in the ground so that some of the pillars adjacent to each other overlap each other in plan view. The column row wall is configured such that it is located on a line orthogonal to the column row wall passing through the center of any column body only on one side of the column row wall, and part of the column row wall overlaps with the column body in plan view. Forming a widened column body, and the widened column body portion is constituted by the widened column body and a column body overlapping with the widened column body, and the width of the horizontal section in the width direction is larger than the diameter of the column body in the wide column body portion. Since a long core material is inserted, it is possible to develop high strength with a core material having a horizontal section whose length in the width direction is longer than the diameter of the column body (that is, a core material having a large “beam formation”). Also, the cost of core material is reduced because a core material with a large "beam formation" is used compared to the case where a core material with a small "beam formation" is densely used as in the past. In addition, since the underground wall is wide except for the wide pillars, there is an advantage that the construction cost of the underground wall can be saved, and only one side of the column wall can be selected. Since the expansion columnar body is formed so as to pass through the center of the columnar body and is orthogonal to the column row wall and partially overlap with the columnar body in plan view, the expansion columnar body is projected. When excavating the inside of the underground wall by setting the other side of the pillar column wall as the underground excavation side, the wide column does not hinder the underground excavation work, and the same way as the conventional underground wall. Underground excavation work is possible.

In addition, among a large number of pillars constituting the pillar row wall, a pillar which does not overlap with the expanding pillar is inserted with a core material having a horizontal section having a width in the width direction shorter than the diameter of the pillar. In, the strength of the underground wall is further improved, and the underground wall with high strength can be obtained. Also, if the column wall and the column for expansion are made of a mixture of the soil of the original ground and the consolidation liquid, vibration will be applied after the completion of construction, compared with the case where the core material is inserted into concrete. By doing so, it is possible to pull out the core material with a large "beam formation" to the ground relatively easily, and it is possible to reuse the core material with a large "beam formation".
The cost can be reduced.

[Brief description of drawings]

FIG. 1 is a horizontal sectional view of an underground wall of the present invention.

FIG. 2 is a perspective view of an essential part showing an example of an apparatus for forming the underground wall of the above.

FIG. 3 is an overall front view of the same device.

FIG. 4 is an overall side view of the above apparatus.

FIG. 5 is a horizontal sectional view of the same device.

6 (a), (b), (c) and (d) are explanatory views showing one construction sequence of the above.

FIG. 7 is a horizontal sectional view of another embodiment of the present invention.

8A and 8B are horizontal sectional views of still another embodiment of the present invention.

FIG. 9 is a horizontal sectional view showing an underground wall of a conventional example.

[Explanation of symbols]

 20 Columns 21 Column Row Walls 22 Columns for Expansion 23 Wide Columns 24 Cores 25 Cores

Claims (3)

[Claims] 1. A pillar row wall is continuously arranged in a row so that some of the pillar bodies adjacent to each other in the ground overlap each other in a plan view. A column for expansion is formed so that it is located on a line that passes through the center of an arbitrary column only on one surface side and that is orthogonal to the column row wall, and a part of the column overlaps with the column in plan view. A wide columnar body is configured by the columnar body and a columnar body overlapping with the columnar body, and a core material having a horizontal section with a length in the width direction longer than the diameter of the columnar body is inserted into the wide columnar body. The structure of the underground wall. 2. A core member having a horizontal section whose width in the width direction is shorter than the diameter of the pillar body is inserted into a pillar body which does not overlap with the expanding pillar body among a large number of pillar bodies forming the pillar row wall. The structure of the underground wall according to claim 1, wherein the structure is formed. 3. The structure of the underground wall according to claim 1, wherein the column wall and the column for expansion are made of a mixture of the soil of the original ground and a consolidation liquid. .