JP2019190029A - Guide wall and construction method of guide wall - Google Patents

Abstract

To provide a guide wall and like allowing construction to be easily performed in a short period and missing of stable solution to be prevented.SOLUTION: A guide wall 2 is formed by burying a steel plate 6 with legs in a ground improvement part 3. The ground improvement part 3 is formed to a predetermined depth from a ground surface by improving both sides of the ground 1 at a boring position 1a of a boring groove. The steel plate 6 with the legs comprises a steel plate 5, leg parts 7, anchor plates 11 and like. The steel plate 5 is a plate member in a general vertical direction buried along an extending direction of the boring position 1a at an end part of the boring position 1a at the ground improvement part 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a guide wall and a construction method thereof.

  When a wall body is constructed by excavating an excavation groove in the ground, a guide wall is constructed in advance near the ground surface on both sides of the excavation position (see, for example, Patent Document 1). The excavation of the ground is performed between the guide walls. At this time, the excavation groove is filled with a stabilizing liquid for the stability of the groove wall.

  The guide wall is provided for the purpose of positioning the excavator, preventing collapse of the upper part of the groove wall due to the load of a large heavy machine working in the vicinity of the excavation groove, and temporarily receiving and positioning a reinforcing bar rod or steel pipe pile built in the excavation groove.

  At the time of construction of the guide wall, the ground 1 is once excavated as shown in FIG. 9A, and then the guide wall 101 is constructed of concrete, and then the excavated portion is backfilled as shown in FIG. 9B. One reason for refilling the space between the guide walls 101 is that the excavation between the guide walls 101 is performed for each block by dividing the extending direction of the excavation position into a plurality of blocks. This is to prevent the stabilizing liquid from flowing out between the guide walls 101. Another reason is to keep the interval between the guide walls 101 constant, and a width stop (not shown) or the like may be arranged between the guide walls 101 to maintain the interval. In the example of FIG. 9, the cross-sectional shape of the guide wall 101 is a U-shape, but this is not a limitation.

  As another guide wall, as shown in FIG. 10, there is a structure in which a plurality of H-section steels 103 are stacked, but the guide wall construction procedure is basically the same as described above.

JP-A-4-269210

  As described above, when the conventional guide wall is constructed, excavation, backfilling and width stop of the ground 1 are necessary, and the construction takes a long time.

  Further, the concrete guide wall 101 as shown in FIG. 9 is constructed by dividing it into several blocks along the extending direction of the excavation position. The procedure is to install the formwork, place and cure the concrete, and remove the formwork. It was necessary to step on, and it took time and effort.

  Further, in the guide wall using the H-section steel 103 as shown in FIG. 10, there is a problem that the stable liquid in the excavation groove tends to escape from the gap between the H-section steels 103, and the liquid level control of the stable liquid is difficult. there were.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a guide wall and the like that can be easily constructed in a short period of time and can prevent the loss of a stable liquid.

  According to a first aspect of the present invention for achieving the above object, a ground improvement portion formed from a ground surface to a predetermined depth on a side of a digging position of a digging groove, and an end portion of the ground improvement portion on the digging position side And a substantially vertical steel plate embedded along the extending direction of the excavation position.

  In the first invention, the guide wall can be constructed by improving the ground on the side of the excavation position of the excavation groove and burying a substantially vertical steel plate in the ground improvement portion along the extending direction of the excavation position. In this case, it is not necessary to excavate or backfill the ground, or to stop the width when constructing the guide wall, and it is not necessary to install or remove the formwork, so the guide wall can be easily constructed in a short period of time. In addition, the steel plate and the ground improvement part behind it can prevent water from leaking during the excavation of the excavation groove.

It is desirable that the steel plates adjacent in the extending direction of the excavation position are connected by a joint.
Thereby, the continuity between steel plates can be improved and the water loss of the stabilizing liquid can be reliably prevented.

It is desirable that a leg portion, which is a plate material in a substantially vertical direction, is provided on a surface of the steel plate opposite to the excavation position so as to be substantially orthogonal to the steel plate.
Thereby, the fixability of the steel plate to a ground improvement part can be improved.

It is also desirable that a fixing plate substantially parallel to the steel plate is provided at an end portion of the leg portion opposite to the excavation position. Alternatively, a reinforcing plate substantially parallel to the steel plate may be provided at an end of the leg opposite to the excavation position, and the reinforcing plates adjacent in the extending direction of the excavation position may be connected by a joint. .
In the former case, the fixing property of the steel plate to the ground improvement portion can be further enhanced by the fixing plate, and in the latter case, the ground improvement portion can be reinforced by the reinforcing plate.

According to a second aspect of the present invention, a step of forming a ground improvement portion from a ground surface to a predetermined depth at a side of the excavation position of the excavation groove, and a substantially vertical steel plate are connected to an end of the ground improvement portion on the excavation position side. And a step of burying along the extending direction of the excavation position at the section.
2nd invention is the construction method of the guide wall of 1st invention.

  ADVANTAGE OF THE INVENTION According to this invention, the guide wall etc. which can be constructed easily in a short period of time and can prevent the water loss of a stable liquid can be provided.

The figure which shows the guide wall 2. FIG. The figure shown about construction of the guide wall 2. FIG. The figure shown about the excavation of the excavation groove 21, and construction of a wall. The figure which shows the block a. The figure shown about the excavation of the excavation groove 21, and construction of a wall. The figure shown about the excavation of the excavation groove 21, and construction of a wall. The figure which shows the steel plates 6a, 6b, 6c with a leg. The figure which shows the guide wall 2a. The figure which shows the guide wall 101. FIG. The figure which shows the guide wall by the H-section steel 103.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
(1. Guide wall 2)
FIG. 1 is a view showing a guide wall 2 according to the first embodiment of the present invention. FIG. 1A is a view showing a vertical cross section of the guide wall 2, and shows a cross section taken along line BB in FIG. FIG. 1B is a view showing a horizontal cross section of the guide wall 2, and shows a cross section taken along line AA in FIG.

  The guide wall 2 is formed on the ground 1 on both sides of the excavation position 1a of the excavation groove. The guide wall 2 is obtained by burying legged steel plates 6 in the ground improvement portion 3.

  The ground improvement part 3 is formed by improving the ground 1 on both sides of the excavation position 1a from the ground surface to a predetermined depth. The ground improvement part 3 is formed in a strip shape along the extending direction of the excavation position 1a (corresponding to the vertical direction in FIG. 1B).

  The ground improvement unit 3 is formed by, for example, an in-situ mixing and stirring method in which a solidified material such as cement milk is mixed and stirred with the ground 1 in place by a power blender or the like. However, the present invention is not limited to this. For example, the solidified material may be formed using a high-pressure jet stirring method in which the solidified material is jetted onto the ground 1 in the original position and mixed with the ground 1.

  The legged steel plate 6 includes a steel plate 5, legs 7, a fixing plate 11, and the like.

  The steel plate 5 is a plate material in a substantially vertical direction, and is disposed along the extending direction of the excavation position 1a at the end of the ground improvement unit 3 on the excavation position 1a side. A substantially U-shaped joint 15 is provided at one end of the steel plate 5 in the extending direction in plan view.

  The leg 7 is a plate material in a substantially vertical direction, and is provided so that one end is fixed to the back surface of the steel plate 5 (the surface opposite to the excavation position 1 a) and is substantially orthogonal to the steel plate 5. In the present embodiment, the plurality of leg portions 7 are attached to the single steel plate 5 at intervals in the vertical direction and the extending direction of the excavation position 1a, but the present invention is not limited to this. For example, a single substantially vertical plate having a height similar to that of the steel plate 5 may be attached so as to be substantially orthogonal to the steel plate 5 to form a leg portion.

  The fixing plate 11 is a substantially vertical plate member disposed substantially in parallel with the steel plate 5. The fixing plate 11 is provided in a substantially T shape in plan view at the other end of the leg 7 (the end opposite to the excavation position 1a).

  A plurality of legged steel plates 6 are embedded in the ground improvement portion 3 along the extending direction of the excavation position 1 a, and ends of the steel plates 5 of the adjacent legged steel plates 6 are connected to each other by a joint 15.

(2. Construction of guide wall 2)
In order to construct the guide wall 2, first, as shown in FIG. 2 (a), the ground 1 on both sides of the excavation position 1a of the excavation groove is improved from the ground surface to a predetermined depth, and the ground improvement part 3 is formed. To do.

  The ground improvement part 3 has fluidity for 1 to 2 days after the completion of the construction. During this period, the legged steel plate 6 is inserted into the ground improvement part 3 as shown in FIG. Include.

  The legged steel plate 6 can be built using, for example, a hydraulic excavator with an attachment, and the plurality of legged steel plates 6 are sequentially built in the extending direction of the excavation position 1a. The steel plates 5 of the adjacent legged steel plates 6 are connected by the joint 15 described above. Since the entire steel plate 6 with legs is formed of a plate material in a substantially vertical direction, the resistance at the time of insertion into the ground improvement portion 3 is small and it is easy to install.

  After the legged steel plate 6 is built and until the ground improvement part 3 is solidified, the legged steel plate 6 is held by the retainer 19 such as a steel material straddling the ground improvement part 3, and the legged steel plate Hold the height and posture of 6. When the ground improvement part 3 solidifies and the legged steel plate 6 is fixed, the holder 19 is removed and the guide wall 2 is completed.

(3. Excavation of excavation groove 21 and construction of wall)
When the guide wall 2 is completed, an unillustrated excavator is installed on one side of the guide wall 2, and the excavation position 1a of the ground 1 is excavated to form an excavation groove 21 as shown in FIG. The excavation groove 21 is excavated in a state filled with the stabilizing liquid 23. The liquid level of the stabilizing liquid 23 is usually managed about 0.5 m below the top end of the guide wall 2.

  The excavation groove 21 is excavated so that the steel plate 5 is exposed, but the stable liquid 23 is prevented from leaking water by the steel plate 5 and the ground improvement portion 3 on the back surface thereof. In particular, in this embodiment, the steel plates 5 of the adjacent legged steel plates 6 are connected to each other by the joint 15, and the water loss of the stabilizing liquid 23 can be more reliably prevented.

  When the excavation groove 21 is excavated in this way, as shown in FIG. 3 (b), a reinforcing material (not shown) such as a reinforcing bar or steel pipe pile is installed inside the excavation groove 21, and then the concrete 10 is placed in the excavation groove 21. Placing a wall to build it. The wall body can be provided so as to protrude on the ground.

  The wall body is constructed for each block a obtained by dividing the excavation position 1a in the extending direction as illustrated in FIG. 4, and excavation of the excavation groove 21 of each block and concrete as shown in FIGS. 5 (a) to 5 (d). 10 may be placed in order along the extending direction, or the excavation of the excavation groove 21 and the placement of the concrete 10 may be performed first in every other block as shown in FIGS. 6 (a) to 6 (d). After performing, excavation of the excavation groove 21 and placement of the concrete 10 may be performed in the block between them. In any case, the distance between the guide walls 2 on both sides of the excavation groove 21 is supported by the ground 1 or the concrete 10 of the block adjacent to the excavation groove 21 and is kept constant, so that the groove wall does not collapse.

  After constructing the wall body, the guide wall 2 may be removed or left as it is. In the latter case, a wall structure including the wall body and the guide wall 2 is formed.

  Thus, in 1st Embodiment, the guide wall 2 can be constructed | assembled by improving the ground 1 of the side of the excavation position 1a of the excavation groove 21, and embedding the legged steel plate 6 in the ground improvement part 3. FIG. In this case, when the guide wall 2 is constructed, excavation, backfilling, width stop, etc. of the ground 1 are unnecessary, and it is not necessary to install or remove the formwork, so the guide wall 2 can be easily constructed in a short period of time and the cost can be reduced. . Moreover, the steel plate 5 of the legged steel plate 6 and the ground improvement part 3 behind the steel plate 5 can prevent the stable liquid 23 from leaking when the excavation groove 21 is excavated.

  Moreover, since the steel plates 5 of the legged steel plates 6 adjacent to each other in the extending direction of the excavation position 1a are connected by the joint 15, it is possible to increase the continuity between the steel plates 5 and to reliably prevent the stable liquid 23 from leaking water. it can.

  Moreover, the fixing property of the steel plate 5 to the ground improvement part 3 can be improved by providing the said leg part 7 in the back surface of the steel plate 5. FIG. In particular, in the present embodiment, since the fixing plate 11 is provided on the leg portion 7, the fixing property is higher.

  However, the present invention is not limited to this. For example, the shape of the legged steel plate is not limited to that described above, and the leg portion 7 and the fixing plate 11a may be arranged in a substantially L shape in plan view as shown in the legged steel plate 6a in FIG. .

  Moreover, in this embodiment, the steel plates 5 of the adjacent legged steel plates 6 are connected by a substantially U-shaped joint 15, but the steel plates 5 are connected by a lap joint as shown in the legged steel plate 6b of FIG. May be. Further, as shown in a legged steel plate 6c in FIG. 7 (c), a substantially C-shaped joint 15a and a substantially T-shaped joint 15b are respectively provided at both ends of the steel plate 5, and the joint 15a of one legged steel plate 6c is provided. The joint 15b of the other legged steel plate 6c may be inserted and connected inside.

  Hereinafter, another example of the present invention will be described as a second embodiment. In the second embodiment, a configuration different from that of the first embodiment will be described, and the description of the same configuration will be omitted by attaching the same reference numerals in the drawings and the like.

[Second Embodiment]
FIG. 8 is a view showing a guide wall 2a according to the second embodiment of the present invention. FIG. 8A is a view showing a vertical section of the guide wall 2a, and shows a section taken along line DD in FIG. 8B. FIG. 8B is a diagram showing a horizontal cross section of the guide wall 2a, and shows a cross section taken along line CC in FIG. 8A.

  The guide wall 2a has substantially the same configuration as the guide wall 2 of the first embodiment, except that the reinforcing plate 25 is fixed to the legged steel plate 6d instead of the fixing plate 11, and the ground improvement portion 3 is located deeper. The steel plate 5 is located in the range from the top of the ground improvement portion 3 to the intermediate depth, while the reinforcing plate 25 is deeper than that, and differs in that it is located in the range from the top to the bottom of the ground improvement portion 3. .

  The reinforcing plate 25 is a substantially vertical plate disposed substantially in parallel with the steel plate 5. Like the steel plate 5, a substantially U-shaped joint 15 is provided at one end in the extending direction of the excavation position 1 a in a plan view. It is done. The ends of the reinforcing plates 25 of the adjacent legged steel plates 6d are connected by the joint 15.

  The construction method of the guide wall 2a is the same as that of the first embodiment, but the steel plate 5 of the adjacent legged steel plate 6d and the reinforcing plate 25 are connected by the joint 15 when the legged steel plate 6d is built.

  The guide wall 2a of the second embodiment can also be constructed in the same manner as in the first embodiment, and the same effect as in the first embodiment can be obtained. In the second embodiment, the guide wall 2a can be reinforced by providing the reinforcing plate 25 on the legged steel plate 6d. In addition, the joint which connects the reinforcement board 25 is not specifically limited, For example, it is possible to apply the joint demonstrated in FIG.7 (b), (c).

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea disclosed in the present application, and these naturally belong to the technical scope of the present invention. Understood.

1: Ground 1a: Excavation position 2, 2a, 101: Guide wall 3: Ground improvement part 5: Steel plates 6, 6a, 6b, 6c, 6d: Steel plate with legs 7: Leg portions 10: Concrete 11, 11a: Fixing plate 15 15a, 15b: Joint 21: Excavation groove 23: Stabilizing liquid 25: Reinforcement plate 103: H-section steel

Claims (6)

A ground improvement part formed from the ground surface to a predetermined depth on the side of the excavation position of the excavation groove,
A steel plate in a substantially vertical direction embedded along the extending direction of the excavation position at the end of the excavation position side of the ground improvement part,
A guide wall comprising:   The guide wall according to claim 1, wherein the steel plates adjacent in the extending direction of the excavation position are connected by a joint.   The guide wall according to claim 1 or 2, wherein a leg portion, which is a plate material in a substantially vertical direction, is provided on a surface opposite to the excavation position of the steel plate so as to be substantially orthogonal to the steel plate. .   The guide wall according to claim 3, wherein a fixing plate substantially parallel to the steel plate is provided at an end portion of the leg portion opposite to the excavation position. A reinforcing plate substantially parallel to the steel plate is provided at the end of the leg opposite to the excavation position,
The guide wall according to claim 3, wherein the reinforcing plates adjacent in the extending direction of the excavation position are connected by a joint. Forming a ground improvement portion from the ground surface to a predetermined depth at the side of the excavation position of the excavation groove;
Burying a steel plate in a substantially vertical direction along the extending direction of the excavation position at the end of the excavation position side of the ground improvement part;
A guide wall construction method comprising the steps of:

Images