JP5428575B2 - Wall structure to be constructed on the ground and its construction method - Google Patents

Description

The present invention relates to a wall structure to be constructed on a ground such as a temporary cutoff wall or a retaining wall, which requires a water stop function, and a construction method thereof.
In the present specification, the parent pile means a pile that supports water pressure and earth pressure that are placed in the ground and acts on a steel sheet pile in construction such as temporary closing and earth retaining, and the form of a member used for it is particularly It is not limited and includes various modes such as a steel pipe pile, an H-shaped steel pile, and an I-shaped steel pile.

When a steel sheet pile or a steel pipe sheet pile is used as a structural member in a closing work or excavation work, a water stop treatment is performed when the water stop performance of the joint portion is required.
As an example of the water stop process in a steel sheet pile, there exists the water stop process method described in the prior art of patent document 1, for example. This water-stop treatment method is to apply a water-swelling water-stopping material to the fitting inscribed portion of the joint, and to place a steel sheet pile after the water-swelling water-stopping material is dried. The water-absorbing / swelling water-stopping material expands due to moisture in the ground and fills the gaps in the joint fitting portion, whereby the water-tightness of the joint fitting portion is expressed (see [0003] of Patent Document 1). ).

  Moreover, as an example of the water stop process of a steel pipe sheet pile, there exists the water stop process method described in the prior art of patent document 2, for example. This water stop treatment method is a method in which a joint member formed with a slit in a small-diameter circular steel pipe is provided on a steel pipe sheet pile, and joint members of adjacent steel pipe sheet piles are placed on the ground while fitting the slits of the joint member. By excavating, discharging, and washing the space of the fitting portion, and filling the space with a cement-based filler 7 such as mortar, the joint is provided with the required shear strength, rigidity, and waterstop. (See [0004] of Patent Document 2).

JP 2002-363974 A Japanese Patent Laid-Open No. 11-140863

When penetrating a steel sheet pile or steel pipe sheet pile into the ground, generally, a method is used in which a member is gripped by the ground portion and penetrated by applying a load, vibration, impact, or the like. At this time, a guide frame may be used to keep the distance between adjacent members constant, but it is difficult to keep the distance between the members constant up to the underground part.
As a result, when the water-stopping material is applied to the steel sheet pile joint in advance, the applied water-stopping material peels off and the water-stopping effect cannot be obtained, or the steel pipe sheet pile is filled with mortar etc. In some cases, a space necessary for filling mortar or the like cannot be secured, and mortar or the like cannot be filled, so that it is sometimes impossible to secure the water stoppage of the joint.

  This invention is made | formed in order to solve this subject, and it aims at obtaining the wall structure constructed | assembled in the ground which can ensure water-stopping after placing in a ground, and its construction method.

The problem which said prior art document has is because it is difficult to manage the fitting state of the joint part between members when penetrating a steel sheet pile or a steel pipe sheet pile into the ground.
Therefore, in order to allow the water-stopping material to be applied to the joint before or after penetration without having to manage the fitting state of the joint between the members at the time of penetration, the concave groove for filling the water-stopping material What is necessary is just to use the joint part which has.
When the water-stopping material is installed in the ditch, the water-stopping effect can be obtained by the expansion pressure of the water-swelling water-stopping material that has been installed. Repeated research.
And the inventor pays attention to the fact that earth and sand and water exist on the back side partitioned by the constructed wall in the case of deadline construction and excavation work, and earth pressure and water pressure always act on the wall from the back side. The inventors considered using a unidirectional load acting from the back side to increase the water stop effect by setting the fitting state of the joint portion to a predetermined state after the member is placed.

However, in ordinary steel sheet pile walls and steel pipe sheet pile walls, almost equal earth pressure and water pressure act on each member constituting the wall, and the entire wall tends to deform in the same way. Even if a load in the direction acts, the fitting state of the joint portion does not change greatly, and it is difficult to control the changing state.
Therefore, by adopting a composite structure consisting of the main pile and steel sheet pile, the steel sheet pile receives the earth pressure and water pressure, and the force is transmitted to the parent pile through the joint, and finally from the parent pile. We thought about making it a structure to convey to the ground and support work. By making such a structure, the load was always applied to the joint part of the main pile and the steel sheet pile, and the knowledge that the fitting state could be controlled to a predetermined state in all the joint parts was obtained.
The present invention has been made based on such knowledge, and specifically comprises the following constitution.

(1) The wall structure to be constructed on the ground according to the present invention includes a steel sheet pile having joint portions that can be fitted to each other, and a parent pile having a larger cross-sectional rigidity than the steel sheet pile, and a joint between the parent pile and the steel sheet pile. The base piles and the steel sheet piles are alternately placed by fitting the parts to each other, and a concave groove is formed in at least one of the steel sheet pile or the joint portion of the parent pile. And the concave groove is filled with a water stop material, and a part of the other joint portion that is fitted to the joint portion in which the concave groove is formed is disposed opposite to the water stop material in the fitted state, and When the drainage and / or soil removal treatment is performed from one section partitioned by the wall formed by the steel sheet pile and the parent pile, the steel sheet pile moves relative to the parent pile so that the water stop material is It is configured to be compressed by a part of the joint portion. It is.

(2) Moreover, the thing as described in said (1) WHEREIN: The said water stop material is what has a water absorption swelling property, It is characterized by the above-mentioned.

(3) Moreover, the construction method of the wall structure constructed | assembled to the ground which concerns on this invention is a construction method of the wall structure constructed to the ground as described in said (1) or (2), Comprising: The said steel sheet pile and / or After filling the concave groove of the parent pile with a water stop material in advance, the placing step of placing the steel sheet pile and the parent pile, and the wall formed by the placed steel sheet pile and the parent pile A step of performing drainage and / or soil removal treatment from one of the partitioned compartments,
The said one division is a division where the said water stop material will be compressed by a part of said joint part, when the said steel sheet pile moves relatively with respect to the said main pile by drainage and / or a soil removal process. It is characterized by this.

(4) Moreover, it is the construction method of the wall structure constructed to the ground as described in said (1) or (2), Comprising: The placing process of placing the steel sheet pile and the parent pile, the steel sheet pile, and / or Alternatively, the filling step of filling the concave groove of the parent pile with the water-stopping material, and drainage and / or drainage from one section partitioned by the wall formed by the steel sheet pile and the parent pile after the filling step A process for performing processing,
The said one division is a division where the said water stop material will be compressed by a part of said joint part, when the said steel sheet pile moves relatively with respect to the said main pile by drainage and / or a soil removal process. It is characterized by this.

  The wall structure to be constructed on the ground according to the present invention includes a steel sheet pile and a parent pile having joint parts that can be fitted to each other, and the parent pile and a joint part of the steel sheet piles are mutually fitted to the parent pile. The steel sheet piles are placed on the ground so that they are alternately arranged, and at least one of the steel sheet piles or the joint portion of the parent pile is formed with a groove and filled with a water stop material. In addition, a part of the other joint part that is fitted to the joint part in which the concave groove is formed is arranged opposite to the water stop material in the fitted state, and is partitioned by a wall formed by the steel sheet pile and the parent pile. Since the water-stopping material is compressed by a part of the joint portion when drainage and / or soil discharge treatment is performed from one of the sections formed, the water-stopping treatment of the joint portion is ensured. Can be done.

It is a top view of the wall structure constructed in the ground concerning one embodiment of the present invention. It is sectional drawing which follows the arrow AA line of FIG. It is an enlarged view which expands and shows the part enclosed with the dotted line of FIG. It is an enlarged view which expands and shows the part enclosed with the dotted line of FIG. 3, Comprising: The state before drainage is shown. It is an enlarged view which expands and shows the part enclosed with the dotted line of FIG. 3, Comprising: The state after drainage is shown. It is explanatory drawing of the other aspect of one embodiment of this invention, and has shown the state of the joint part before drainage. It is explanatory drawing of the other aspect of one embodiment of this invention, and has shown the state of the joint part after drainage. It is explanatory drawing of the wall structure constructed in the ground which concerns on other embodiment of this invention. It is a top view of FIG.

[Embodiment 1]
In the present embodiment, the wall structure of the present invention is applied to a temporary cutoff wall 1 in river cutoff work. As shown in FIG. 1, the existing revetment 3 is one side and the remaining three sides are the temporary cutoff wall 1. It is said.
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
In the wall structure according to the present embodiment, the steel pile 5 and the main pile 7 having joints that can be fitted to each other are fitted to each other, and the joint of the parent pile 7 and the steel sheet pile 5 are fitted to each other. It is placed on the riverbed so that 5 are alternately arranged. 4 and 5, the groove 11 is formed in the joint portion 9 of the steel sheet pile 5, and the water stop material 13 is filled in the groove 11.
Hereinafter, each configuration will be described in detail.

<Steel sheet pile>
The steel sheet pile 5 is U-shaped and has a Larsen-type joint portion 9 at both ends. A concave groove 11 is formed over the entire length of the claw of the joint portion 9, and the concave groove 11 is filled with a water-swelling water-stopping material 13 such as a water-expandable water-stopping rubber or silicone resin. ing.
In addition, as a steel sheet pile, it is not necessarily limited to a U type thing, For example, even a hat type thing can be used.

<Parent pile>
The parent pile 7 is formed from a steel pipe pile in which connection joints 15 are welded to both ends. The parent pile 7 needs to have a cross-sectional rigidity capable of supporting the soil water pressure acting on the adjacent steel sheet pile 5 in addition to the soil water pressure acting on itself, and at the same time, the base pile 7 also needs a rigidity that does not hinder the penetration into the ground. As long as such requirements are satisfied, other forms such as H-shaped steel piles can be used in addition to steel pipe piles. In addition, since the main pile 7 also supports the earth-water pressure which acts on the steel sheet pile 5, generally cross-sectional rigidity becomes larger than the steel sheet pile 5. FIG.

  The connection joint 15 welded to the parent pile 7 can be formed by hot rolling or hot extrusion, or can be cut out from the joint portion of the steel sheet pile 5 and is equal to or more than the joint portion 9 of the steel sheet pile 5 to be connected. It is desirable to have a fitting / removing strength of. Needless to say, the connection / disengagement strength of the connection joint 15 needs to be sufficient to transmit the earth / water pressure acting on the steel sheet pile 5 to the parent pile 7.

<Waterproof material>
As a method of filling the groove 11 of the joint portion 9 of the steel sheet pile 5 with the water stop material 13, a method of previously installing the water stop material 13 in the groove 11 and using the groove 11 after the steel sheet pile is placed. There is a method of filling the water stop material 13.
When the water stop material 13 is installed in advance, after the steel sheet pile 5 is placed, the water stop material 13 absorbs surrounding water and expands (see FIG. 4). Then, the earth and water pressure shown by the arrow of FIG. 5 acts on the steel sheet pile 5 along with excavating the inner side of the temporary cutoff wall 1 or draining the inner water, and the steel sheet pile 5 is applied to the parent pile 7. Therefore, the water stop material 13 is pressed down at the tip of the connecting joint 15 facing, and the water channel is closed and water is reliably stopped (see FIG. 5).

  In the case of the method of filling the water-stopping material 13 after the steel sheet pile is cast, the joint is filled with a hardly water-permeable material such as a silicone resin using the concave groove 11 after the steel sheet pile is cast. After the silicone resin is cured, the water stop material 13 absorbs surrounding water and expands (see FIG. 4). Then, the earth and water pressure shown by the arrow of FIG. 5 acts on the steel sheet pile 5 along with excavating the inner side of the temporary cutoff wall 1 or draining the inner water, and the steel sheet pile 5 is applied to the parent pile 7. Therefore, the silicone resin is pressed down at the tip of the connecting joint 15 facing each other, so that the water channel is closed and water is surely stopped.

Next, the construction method of the wall structure comprised as mentioned above is demonstrated.
The temporary pile wall 1 is constructed by sequentially placing the steel piles 5 in which the water stop material 13 is previously filled in the groove 11 and the main pile 7 and fitting the respective joints into the river.
After the placement, the water-stopping material 13 absorbs water and expands, and as shown in FIG. Thereafter, when the water surrounded by the temporary cutoff wall 1 and the existing revetment 3 is drained, a water level difference is generated with the temporary cutoff wall 1 as a boundary, and water pressure acts toward the inside of the temporary cutoff wall 1. At this time, the water pressure also acts on the parent pile 7, but since the intrusion portion below the river bed is deep, resistance is reduced at this portion and the deformation amount is small. On the other hand, the steel sheet pile portion has a shallow depth and has a smaller cross-sectional rigidity than that of the parent pile 7 and therefore tends to be greatly deformed toward the inner direction of the temporary fastening line. As a result, as shown in FIG. 5, the water stop material 13 is pressed against the connection joint 15 to close the water channel.
As described above, the water stop material 13 may be filled after the steel sheet pile 5 in which the concave groove 11 is formed.

As described above, in the present embodiment, the steel sheet pile 5 is driven by filling the concave groove 11 formed in the joint portion 9 of the steel sheet pile 5 with the water stop material 13. The material 13 is not peeled off, and the water-stopping material 13 is pressed against the connection joint 15 by performing the drainage treatment inside the temporary cutoff wall 1 so that the water channel is closed and the water is surely stopped.
Since the steel sheet pile 5 having the concave groove 11 is placed in the joint portion 9 and the water stop material 13 is filled in the concave groove 11, the water stop material 13 can be reliably filled and the temporary cutoff wall 1 By performing the inner drainage treatment, the water stop material 13 is pressed against the connection joint 15 and the water channel is blocked, and the water is reliably stopped.

In the above embodiment, an example in which the concave groove 11 is provided in the joint portion 9 of the steel sheet pile 5 and the water stop material 13 is filled is shown. However, as shown in FIGS. May be provided on the inner surface side of the connection joint 15 of the parent pile 7 and the water stop material 13 may be filled on the connection joint 15 side of the parent pile 7.
Moreover, you may make it provide the ditch | groove 11 in both the coupling part 9 of the steel sheet pile 5, and the connection coupling 15 of the parent pile 7. FIG. By providing both, more reliable water stop is possible.

[Embodiment 2]
In the present embodiment, as shown in FIGS. 8 and 9, the wall structure of the present invention is applied to a retaining wall 17 in excavation work. 8 and 9, the same parts as those in FIGS. 1 to 7 and corresponding parts are denoted by the same reference numerals.
In the present embodiment, the parent pile 7 uses H-shaped steel welded to the connection joint 15, and after placing the parent pile 7 and the steel sheet pile 5, the concave groove 11 formed in the joint portion 9 of the steel sheet pile 5. The water-stopping material 13 is filled in the joint using
After the earth retaining wall 17 is constructed, the inside of the earth retaining wall 17 is excavated, but as the excavation progresses, excavation proceeds while supporting the parent pile 7 by supporting works such as 19 and piercing beams 21. As the excavation progresses, earth pressure and water pressure act on the retaining wall 17, but the main pile 7 is supported by the support and does not deform greatly. On the other hand, the steel sheet pile 5 tries to deform to the excavation side In the same manner as described in the first embodiment, the water-stopping material 13 is pressed down at the front end portion of the connecting joint 15 facing each other, and the water channel is closed and water-stopped (see FIG. 5).

DESCRIPTION OF SYMBOLS 1 Temporary cut-off 3 Existing revetment 5 Steel sheet pile 7 Parent pile 9 Joint part 11 Groove 13 Water stop material 15 Connection joint 17 Earth retaining wall 19 Raising 21 Cut beam

Claims (4)

A steel sheet pile having a joint part that can be fitted to each other and a parent pile having a cross-sectional rigidity larger than that of the steel sheet pile, and the joint part of the parent pile and the steel sheet pile are mutually fitted to each other. Are formed in the ground so that they are alternately arranged, and a groove is formed in at least one of the steel sheet pile or the joint portion of the parent pile, and the groove is filled with a water stop material, One part of the other joint part that fits the joint part in which the groove is formed is opposed to the water stop material in the fitted state, and is partitioned by the wall formed by the steel sheet pile and the parent pile When the drainage and / or soil removal treatment is performed from the section, the steel sheet pile moves relative to the parent pile so that the water stop material is compressed by a part of the joint portion. Wall structure to be constructed on the ground characterized by   The wall structure to be constructed on the ground according to claim 1, wherein the water blocking material has a water absorption swelling property. It is the construction method of the wall structure of Claim 1 or 2, Comprising: After filling the water stop material in the said ditch | groove of the said steel sheet pile and / or the said main pile beforehand, the said steel sheet pile and the said main pile are cast And a step of performing drainage and / or soil removal treatment from one of the sections partitioned by the wall formed by the steel sheet pile and the parent pile that are placed,
The said one division is a division where the said water stop material will be compressed by a part of said joint part, when the said steel sheet pile moves relatively with respect to the said main pile by drainage and / or a soil removal process. The construction method of the wall structure to be constructed on the ground characterized by this. It is the construction method of the wall structure of Claim 1 or 2, Comprising: The said water stop in the placing process which drives the said steel sheet pile and the said main pile, and the said groove on the said steel sheet pile and / or the said main pile. A filling step of filling a material, and a step of performing drainage and / or soil removal treatment from one section partitioned by the wall formed by the steel sheet pile and the parent pile after the filling step,
The said one division is a division where the said water stop material will be compressed by a part of said joint part, when the said steel sheet pile moves relatively with respect to the said main pile by drainage and / or a soil removal process. The construction method of the wall structure to be constructed on the ground characterized by this.

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