JP5819279B2 - Multi-wall construction method - Google Patents

Description

  The present invention relates to a continuous wall construction method for constructing a continuous wall by installing a continuous wall member, and an excavator used therefor.

  Conventionally, as a method for constructing an underground wall, there is a method called a steel underground continuous wall construction method. In the steel underground continuous wall method, steel joint wall members with male joints or female joints provided at both ends of the flange of an H-shaped steel material are connected to each other at the joints. In this method, a plurality of erections are performed and the surroundings are filled with a filler (see, for example, Patent Documents 1 and 2).

  As a steel underground continuous wall construction method, there is a construction method in which a steel connecting wall member is installed in an excavated part excavated while being filled with a stable liquid by a stable liquid excavation method, and then the stable liquid is replaced with concrete. There is also known a construction method in which a soil mortar is created by an in-situ soil agitation while excavating an excavation part, and a steel continuous wall member is built therein.

  By the way, in order to build a long underground wall by such a construction method, after building the wall body once by building a steel wall member, etc., work again on the next day, etc. The next wall body is constructed by connecting and building the next steel continuous wall member after the steel continuous wall member. Therefore, in order to connect with this member until the next steel continuous wall member is built, it is necessary to protect the joint of the built steel continuous wall member.

JP 2001-254352 A JP 2006-342507 A

  An example of joint protection is shown in FIG. In FIG. 8, a steel continuous wall member 20a having a female joint and a steel continuous wall member 20b having a male joint are connected and built in the excavation part 110 of the ground 100. Further, in front of the female joint of the steel continuous wall member 20a at the end portion on the unexcavated portion 120 side, a sealing material 211 is disposed between the side surface of the excavated portion 110. Around the steel continuous wall members 20a and 20b, the concrete 200 is filled up to the position of the sealing material 211 and the web of the steel continuous wall member 20a at the end.

  A sheet 212 is attached to the sealing material 211, and the side surface of the concrete unfilled portion of the excavation unit 110 is covered with the sheet 212. In addition, a plate material 213 is provided between the side surfaces, and the crushed stone 214 is disposed on the unexcavated portion 120 side from the plate material 213.

  As described above, the female joint of the steel continuous wall member 20a at the end portion on the unexcavated portion 120 side can be protected, and the intrusion of the concrete 200 or the like can be prevented. Thereafter, the work is performed again on the next day, the plate material 213 and the crushed stone 214 are removed, the unexcavated portion 120 is excavated, and the next steel continuous wall member is removed from the end steel continuous wall member 20a. Continue to connect and build.

  However, it takes time and effort to protect the joint of the steel continuous wall member in this way, and there is a problem that leads to a prolonged construction period.

  Patent Document 1 and Patent Document 2 describe that a joint protection member is disposed inside the female joint of the steel continuous wall member to prevent intrusion of concrete or soil cement. Even in this case, it may be troublesome to arrange the joint protection member.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a continuous wall construction method and the like that can easily construct a continuous wall.

The first invention for achieving the above object is drilled in the preceding drilling portion excavated soil, and step (a) constructing a wall filled with a filler around the Renkabe member, said filler and (b) forming a guide hole, and using a drilling machine mounted outside the guide member, dig into non excavation of the ground while passing the guide member in the guide hole step (c), the And a step (d) of constructing a wall body in which a surrounding wall member is filled with a filler in a subsequent excavation portion after excavating an unexcavated portion.
The second invention includes a step (a) of constructing a wall body filled with a filler around the continuous wall member in a preceding excavation part excavating the ground, and a step (b) of forming a guide hole in the filler. And (c) digging down an unexcavated portion of the ground and an end portion of the filler on the unexcavated portion side while passing the guide material through the guide hole, using an excavator with a guide material attached to the outside. And (d) constructing a wall body filled with a filler around the continuous wall member in a subsequent excavation part excavating the unexcavated part and an end of the filler on the unexcavated part side. It is the continuous wall construction method characterized by providing.

  When the connecting wall is constructed in this manner, the joint protection process as described above is not necessary, and the connecting wall can be easily constructed. Further, since the excavator is guided using the guide holes, the ground can be excavated with high excavation accuracy.

In the step (a), the male joint of the other connecting wall member is inserted inside the female joint of one of the connecting wall members, and the connecting wall member is connected and built in the preceding excavation part, and the step (b) In the step (d), the guide hole is formed inside the female joint of the end connection wall member, which is the connection wall member of the end of the preceding excavation part on the unexcavated part side of the ground. It is desirable to insert the male joint of the other continuous wall member inside the female joint of the continuous wall member, and to build the continuous wall member in the subsequent excavation part while continuously connecting the continuous wall member to the end continuous wall member. .
Thereby, when connecting the joint of a continuous wall member and building a continuous wall, a continuous wall can be constructed | assembled easily. In such a case, since excavation accuracy is particularly important, the present invention is particularly effective in that excavation accuracy is improved by performing excavation while being guided by a guide hole. Further, since the joint can be used as the inner wall of the guide hole, the guide material can be smoothly inserted into the guide hole.

The position of the guide material is separated from the cutter of the excavator by a predetermined distance on a plane, and in the step (c), the cutter does not contact the female joint, and the unexcavated portion of the ground, It is desirable to excavate the end of the preceding excavation part on the unexcavated part side at the same time.
As a result, damage to the cutter and the female joint is prevented, and unexcavated portions are not left behind.

The guide member is preferably a bar member having a hemispherical lower end.
Accordingly, the guide material can be smoothly inserted without hindering insertion of the guide material due to the filler remaining in the guide hole.

In the step (a), after a continuous wall member is built in the preceding excavation part in which the ground has been excavated while being filled with a stabilizing liquid, the stabilizing liquid is a soil mortar as a filler or fluidized soil. In the step (d), after the continuous wall member is built in the subsequent excavation part in which the unexcavated part is excavated while being filled with the stable liquid, the stable liquid is the soil that is the filler. It is desirable to replace with mortar or fluidized soil.
In this method, since the soil mortar or the like is post-filled, the period during which the continuous wall member is built is not limited, and the male joint can be continuously provided without causing water-stopping problems.

The third invention includes a step (a) of building a wall body filled with a filler around the continuous wall member in a preceding excavation part excavating the ground, and a step (b) of forming a guide hole in the filler And a step (c) of digging an unexcavated portion of the ground while passing the guide material through the guide hole using an excavator having an outer guide material attached thereto, and a subsequent excavating portion excavating the unexcavated portion And (d) constructing a wall body filled with a filler around the continuous wall member, and in the step (a), the other continuous wall member is placed inside the female joint of one continuous wall member. It is a continuous wall member at the end of the preceding excavation part on the unexcavated part side of the ground in the step (b) in which a male joint is inserted to connect the continuous wall member to the preceding excavation part. The guide hole is formed inside the female joint of the end connecting wall member, and in the step (d), one of the continuous holes is formed. A male joint of the other connecting wall member is inserted inside the female joint of the member, and the connecting wall member is connected to the end connecting wall member and is built in the subsequent excavation part. It is a wall construction method .

By using the drilling machine as described above, it allows you to construct a continuous wall. Further, the excavator can be guided using the guide hole, and the ground can be excavated with high excavation accuracy.

  According to the present invention, it is possible to provide a continuous wall construction method and the like that can be easily constructed.

The figure shown about the steel connection wall 1 The figure which shows steel continuous wall members 10a and 10b The figure which shows the construction method of the steel connection wall 1 The figure which shows the construction method of the steel connection wall 1 Diagram showing the excavator 50 Diagram showing excavation by excavator 50 Diagram showing an example of the CRM method Illustration showing joint protection

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

  FIG. 1 is a view showing a steel continuous wall 1 (continuous wall) constructed by the continuous wall construction method of the present embodiment. The steel continuous wall 1 is constructed by connecting steel continuous wall members 10a and 10b (continuous wall members) to excavation portions 110a and 110b excavating the ground 100, and surrounding the soil mortar as a filler. 140 is filled. The filler may be fluidized soil.

  FIG. 2 is a view showing a plane of the steel continuous wall members 10a and 10b. The steel continuous wall members 10 a and 10 b are steel materials having an H shape in which a center portion in the width direction of a pair of flanges 11 is connected by a web 12, and joints are provided at both ends of the flange 11 in the width direction. The steel continuous wall member 10a is provided with a female joint 13 having a shape with a part cut off the circumference, and the steel continuous wall member 10b is provided with a T-shaped male joint 14. These joints are provided continuously in the flange height direction.

  As shown in FIG. 1, the steel continuous wall members 10a and 10b are connected to each other by inserting the male joint 14 of the other member 10b into the female joint 13 of the one member 10a.

  Next, with reference to FIG. 3, FIG. 4, the continuous wall construction method for constructing this steel continuous wall 1 is demonstrated.

  In order to construct the steel continuous wall 1, first, as shown in FIG. 3A, the ground 100 is excavated to form an excavation part 110 a (preceding excavation part). In this embodiment, excavation is performed while the excavation part 110a is filled with the stabilization liquid 130 by the stable liquid excavation method.

  Next, as shown in FIG. 3 (b), the steel continuous wall members 10a and 10b are connected to the inside of the female joint 13 of one member 10a through the male joint 14 of the other member 10b while being connected to the excavation part 110a. Build it in.

  Subsequently, as shown in FIG. 3 (c), in the excavation part 110a, a soil mortar 140 is placed around the steel continuous wall members 10a and 10b, and the wall is constructed by replacing with the stabilizing liquid 130 and filling it. To do.

  Then, after a predetermined period of time such as the next day, work is continued. In this case, first, as shown in FIG. 4A, the soil mortar 140 inside the female joint 13 of the steel continuous wall member 10a (end continuous wall member) at the end portion on the unexcavated portion 120 side is drilled. A guide hole 43 is formed by drilling with a machine or the like. If necessary, a cleaning device such as a jet cleaning rod may be inserted into the guide hole 43 for cleaning, and the soil mortar 140 remaining in the guide hole 43 may be removed.

  Next, as shown in FIG. 4B, the unexcavated portion 120 and the end portion of the soil mortar 140 on the unexcavated portion 120 side are excavated to form an excavated portion 110b (following excavated portion).

  This process will be described with reference to FIGS.

  In this embodiment, excavation is performed using a horizontal multi-axis type excavator such as a TMX excavator, which is generally used for ground excavation in the steel underground wall method. This excavator is shown in FIG. The excavator 50 has a pair of rotary cutters 53 attached to a main body 51 via an arm 52, and is lowered while pressing the cutters 53 against the ground. A protective plate 54 is disposed outside the main body 51.

  In the present embodiment, the guide member 55 is further attached to the protection plate 54 using the attachment jig 56. The guide material 55 has a rod-like shape, and the lower end portion is smoothly formed in a hemispherical shape.

  In the above process, as shown in FIG. 6A, the excavator 50 is lowered and dug down while the guide material 55 is inserted into the guide hole 43 and used as a guide. Since the lower end portion of the guide material 55 is smoothly formed in a hemispherical shape, even when the soil mortar 140 is slightly left in the guide hole 43, the guide material 55 is inserted into the guide hole 43 without being blocked by this. Inserts smoothly.

  FIG. 6B is a diagram showing the positions of the cutter 53 and the guide material 55 on the plane. In the present embodiment, the guide member 55 is arranged so that the distance d1 between the end of the cutter 53 on the excavation part 110a side and the female joint 13 is maintained within a predetermined range. That is, the distance d1 is maintained within a predetermined range even when the guide material 55 is inserted deeply into the guide wall 43 toward the steel continuous wall member 10a or inserted shallowly. The position of the guide material 55 is determined. For example, the position of the outer end portion of the guide material 55 is set to a position separated from the cutter 53 of the excavator 50 by a predetermined distance d2 on the plane.

  Thus, by setting the distance d1 as a predetermined range and setting the upper limit value, the unexcavated portion 120 and the end of the soil mortar 140 on the unexcavated portion 120 side are excavated simultaneously, so that the unexcavated portion 120 is excavated. It is possible to prevent leftovers. Further, the width d3 of the soil mortar 140 remaining between the guide hole 43 of the female joint 13 and the cutter 53 is made thin so as to be fragile and easily collapsed as the mounting jig 56 passes. Moreover, the contact between the cutter 53 and the female joint 13 is prevented by setting the distance d1 to be not less than the lower limit value.

  The range of the distance d1 and the distance d2 are determined according to the diameter of the guide hole 43, the distance from the female joint 13 to the end of the soil mortar 140, and the range of the distance d1 is, for example, 10 mm to 40 mm, The distance d2 can be about 140 mm.

  As described above, in the process shown in FIG. 4B, the unexcavated portion 120 and the excavated portion 110b excavated at the end of the soil mortar 140 on the unexcavated portion 120 side are formed. This excavation is performed by the stable liquid excavation method as described above, and the excavation part 110b is filled with the stable liquid 130.

  Next, the next steel continuous wall member is built in the excavating part 110b while being connected to the inside of the female joint 13 of one member 10a through the male joint 14 of the other member 10b, as described above. As shown in FIG.4 (c), in the excavation part 110b, the steel connection wall member 10a in the edge part by the side of the excavation part 110b of the excavation part 110a is connected and built. Finally, when the wall is constructed by replacing the stabilizer 130 with the soil mortar 140 and constructing the wall body, the steel continuous wall 1 described in FIG. 1 is constructed.

  As described above, according to the present embodiment, when the steel continuous wall 1 is constructed by connecting the joints of the steel continuous wall members 10a and 10b, a conventional joint protection process is not necessary. The steel connecting wall 1 can be easily constructed. Moreover, since the excavator 50 is guided using the guide hole 43, the ground 100 can be excavated with high excavation accuracy.

  Further, in the case where the joints are fitted to each other and the steel continuous wall members 10a and 10b are connected as in this embodiment, it is difficult to finely adjust the position of the member in the excavation part. For this purpose, the excavation accuracy of the excavation part is particularly important. Therefore, the present invention is particularly effective in that excavation is performed while guiding the excavator 50 using the guide hole 43 and the guide material 55 to increase excavation accuracy. Furthermore, the female joint 13 can be used as the inner wall of the guide hole 43, and the lower end portion of the guide material 55 is formed in a hemispherical shape, so that the guide material 55 can be smoothly inserted into the guide hole 43.

  In the present embodiment, the steel continuous wall members 10a and 10b are built in the excavating portions 110a and 110b, and then the surroundings are post-filled with the soil mortar 140 or fluidized soil. For example, when the surroundings of a steel continuous wall member are post-filled with concrete as in the past, the male joint of the steel continuous wall member is intermittently provided in the flange height direction for the purpose of increasing the filling property by flowing the concrete. There is a problem of water stoppage when cracks or the like occur in concrete. In addition, when soil mortar is created by in-situ agitator while excavating the excavation part, and steel continuous wall members are built in it, it is necessary to build the members before the soil mortar is solidified. There is a problem that the construction becomes difficult when the construction possible period is limited due to regulations or the like. However, in the present embodiment, since the soil mortar 140 or the like is post-filled, the period for laying the steel continuous wall member is not limited, and the male joint can be continuously provided and the problem of water-stopping can be avoided. There is.

  The shapes of the female joint 13 and the male joint 14 are not limited to those described above, and various shapes are conceivable. Furthermore, the present invention can also be applied to a CRM method using an H-shaped steel continuous wall member having no joint, and the same effects as described above can be obtained.

  A part of the construction procedure in this case is shown in FIG. Here, as shown in FIG. 7A, the steel continuous wall members 10 c are arranged side by side in the excavation part 110 a, and the surroundings are filled with the soil mortar 140, and then the soil mortar 140 is formed at the end part on the unexcavated part 120 side. Are drilled to form guide holes 43a. Then, excavation by the excavator 50 is performed using the guide hole 43a as described above. FIG. 7B shows a state after excavation is performed in this manner to form the excavation part 110b, and thereafter, the steel continuous wall members 10c are arranged side by side on the excavation part 110b in the same manner as described above, and the surroundings are soiled. The procedure is to fill with mortar 140.

  In addition, the present invention can also be applied in a conventional method such as a method in which concrete is post-filled as a filler around a steel continuous wall member.

  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: Steel connection wall 10a, 10b, 10c, 20a, 20b: Steel connection wall member 13: Female joint 14: Male joint 43, 43a: Guide hole 50: Excavator 53: Cutter 55: Guide material 100: Ground 110 110a, 110b: excavation part 130: stabilization liquid 140: soil mortar

Claims (6)

(A) constructing a wall body filled with a filler around the continuous wall member in the preceding excavation part excavating the ground;
(B) forming a guide hole by drilling the filler;
(C) using an excavator with a guide material attached to the outside and digging an unexcavated portion of the ground while passing the guide material through the guide hole;
A step (d) of constructing a wall body filled with a filler around the continuous wall member in a subsequent excavation portion excavating the unexcavated portion;
A connecting wall construction method comprising: (A) constructing a wall body filled with a filler around the continuous wall member in the preceding excavation part excavating the ground;
Forming a guide hole in the filler (b);
(C) using an excavator with a guide material attached to the outside, digging up the unexcavated portion of the ground and the end portion of the filler on the unexcavated portion side while passing the guide material through the guide hole;
A step (d) of building a wall body filled with a filler around a continuous wall member in a subsequent excavation part excavating the unexcavated part and an end of the filler on the unexcavated part side ;
A connecting wall construction method comprising: In the step (a),
While inserting the male joint of the other connecting wall member inside the female joint of one connecting wall member and connecting the connecting wall member, it is built in the preceding excavation part,
In the step (b),
The guide hole is formed inside the female joint of the end joint wall member, which is a joint wall member of the end of the preceding excavation part on the unexcavated part side of the ground,
In the step (d),
Inserting the male joint of the other continuous wall member inside the female joint of one continuous wall member, and erection in the subsequent excavation part while connecting the continuous wall member to the end continuous wall member. The method for constructing a continuous wall according to claim 1 or 2, characterized in that: The position of the guide material is separated from the cutter of the excavator by a predetermined distance on a plane,
In the step (c),
The cutter is configured to simultaneously excavate the unexcavated portion of the ground and the end portion on the unexcavated portion side of the filler of the preceding excavated portion without contacting the female joint. The connecting wall construction method according to claim 3 . In the step (a), after a continuous wall member is built in the preceding excavation part in which the ground has been excavated while being filled with a stabilizing liquid, the stabilizing liquid is a soil mortar as a filler or fluidized soil. Replaced with
In the step (d), after the continuous wall member is built in the subsequent excavation part in which the unexcavated part has been excavated while being filled with the stable liquid, the stable liquid is filled with the soil mortar or the fluid as the filler. The method for constructing a continuous wall according to any one of claims 1 to 4, characterized in that the soil is replaced with a treated soil. (A) constructing a wall body filled with a filler around the continuous wall member in the preceding excavation part excavating the ground;
Forming a guide hole in the filler (b);
(C) using an excavator with a guide material attached to the outside and digging an unexcavated portion of the ground while passing the guide material through the guide hole;
A step (d) of constructing a wall body filled with a filler around the continuous wall member in a subsequent excavation portion excavating the unexcavated portion;
Equipped with a,
In the step (a),
While inserting the male joint of the other connecting wall member inside the female joint of one connecting wall member and connecting the connecting wall member, it is built in the preceding excavation part,
In the step (b),
The guide hole is formed inside the female joint of the end joint wall member, which is a joint wall member of the end of the preceding excavation part on the unexcavated part side of the ground,
In the step (d),
Inserting the male joint of the other continuous wall member inside the female joint of one continuous wall member, and erection in the subsequent excavation part while connecting the continuous wall member to the end continuous wall member. A method for constructing a continuous wall.

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