JP2016108785A - Fitting member for water cutoff plate, water cutoff plate, rebar frame, and construction method for continuous underground wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fitting member for a water cutoff plate, a water cutoff plate, a rebar frame, and a construction method for a continuous underground wall that enable simple and efficient construction work for a continuous underground wall having water cutoff property.SOLUTION: A fitting member 13 for a water cutoff plate is made of a material that may be cut by a ground excavator, is installed at a boundary part between a preceding element 1 and a following element 2, and is formed into a cylindrical form by combining a base member 131 with a cover member 132, the base member 131 having a holding part formed for holding a water cutoff plate, and the cover member 132 having a curved part covering the holding part. Also provided are a rebar frame 10 including the fitting member 13 for a water cutoff plate, and a construction method for a continuous underground wall using the rebar frame.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a water stop plate mounting member, a water stop plate, a reinforcing steel frame, and a construction method for a continuous underground wall.

The underground continuous wall is generally constructed by dividing it into a plurality of elements.
In the joint portion between the elements, there may be a case where the cut surface (uneven surface) is formed on the end surface (joint surface) of the preceding element, thereby ensuring the joinability with the succeeding element.

  The underground underground wall is generally used as a retaining wall (temporary structure) when constructing an underground structure. However, in recent years, for the purpose of rationalizing the structure, there is a demand for an underground continuous wall that can be used as a permanent structure.

In such a joint portion between the preceding element and the succeeding element in the underground continuous wall, improvement in water-stopping is required.
On the other hand, in the joining structure of the conventional elements which form an uneven surface on the joining surface, the water-stopping property is insufficient as the main structure.

For this reason, there is a case where a water stop member is disposed across the preceding element and the succeeding element to improve water stoppage.
For example, in Patent Document 1, a hollow member made of a material that can be cut by an excavating machine is embedded in an end portion of a preceding element, and a water-stopping member is attached to an opening exposed by cutting a part of the hollow member. A construction method for mounting is disclosed.

JP 2009-185470 A

  In the construction method described in Patent Document 1, when a part of the hollow member is cut, the remaining part of the hollow member may be damaged. If damage occurs in the remaining part of the hollow member, there is a concern that the water stoppage performance may be reduced, so that the subsequent element needs to be carefully constructed.

  From such a point of view, the present invention provides a waterproof plate mounting member, a waterproof plate, a reinforcing bar mount, and a continuous underground wall construction method capable of simple and efficient construction for underground continuous walls having water-stopping properties. It is an issue to provide.

In order to solve the above-mentioned problems, the waterstop mounting member of the present invention is provided at the boundary between the preceding element and the succeeding element, and is formed into a cylindrical shape by combining the base member and the cover material. The base member is formed with a holding portion capable of holding the water stop plate, and the cover material has a curved portion that covers the holding portion, and is made of a material that can be cut by a ground excavator. It is characterized by becoming.
With the water stop plate mounting member of the present invention, a space for mounting the water stop plate is formed across the side edge of the preceding element. The cover material that forms this space is cut immediately before installing the succeeding element so that the holding portion that holds the water stop plate can be reliably exposed.
The base member is preferably formed by integrally forming a tube material in which a slit serving as the holding portion is formed and a pair of plate materials provided so as to face each other with the tube material interposed therebetween.
The water stop plate of the present invention held by the holding portion of the water stop plate mounting member includes a plate-like portion and a locking portion formed at an end of the plate-like portion.

  If such a water stop plate attachment member is arranged in the preceding element and only the cover material is cut when the subsequent element is constructed, the holding portion of the base member is exposed, so that the water stop plate can be attached. According to the present invention, there is no fear that the base member is damaged by the construction of the succeeding element, and the construction can be easily performed.

  The reinforcing bar gantry of the present invention includes a gantry body for constructing a preceding element, a reinforcing bar rod supported by the gantry body, and a pair of water stop plate mounting members fixed to both ends of the gantry body. The water stop plate attaching member is formed in a cylindrical shape by combining a base member and a cover material, and the base member has a holding portion for attaching the water stop plate. The cover material is made of a material that can be cut by a ground excavator and has a curved portion that covers the holding portion.

  If such a reinforcing bar mount is used for the construction of the preceding element, it is possible to easily construct the preceding element provided with the water stop plate attachment member with the succeeding element.

  Furthermore, the construction method of the continuous underground wall of the present invention includes a preceding excavation step for excavating a preceding excavation groove in the ground for constructing the underground wall, and a preceding bar arrangement step for installing the reinforcing bar mount in the preceding excavation groove, A preceding concrete placing step for placing concrete in the preceding excavation groove, a subsequent excavation step for excavating a subsequent excavation groove continuous to the preceding excavation groove, and a reinforcing element mount for a subsequent element in the subsequent excavation groove A post-laying step for installing and a post-concrete concrete placing step for placing concrete in the post excavation groove, and cutting the cover material together with excavation of the post excavation groove in the post excavation step And it is characterized by installing a water stop board in the above-mentioned holding part in the following rearrangement process.

  According to the construction method of the continuous underground wall, it is possible to easily construct the underground continuous wall that ensures water-stopping.

  According to the construction method of the water stop plate mounting member, water stop plate, reinforcing bar base and continuous underground wall of the present invention, there is no concern that the base member will be damaged by the construction of the trailing element, and the labor for excavating the trailing element is reduced. Since reduction can be achieved, it becomes possible to easily form a joint portion between the elements of the underground continuous wall having water-stopping properties.

It is a top view which shows the reinforcing bar mount of embodiment of this invention. It is a schematic diagram which shows the AA cross section of FIG. (A) is an enlarged view which shows the water stop board attachment member of the reinforcing bar frame of FIG. 1, (b) is an enlarged view which shows the state which attached the water stop board to the water stop board attachment member. (A)-(d) is a top view which shows each construction condition of the construction method of the continuous underground wall of embodiment of this invention. (A)-(c) is a top view which shows each construction condition of the construction method of the continuous underground wall following FIG. (A) is a top view which shows the other form of a continuous underground wall, (b) is an enlarged plan view which shows the other form of a water stop plate attachment member.

In the present embodiment, a continuous underground wall constructed by connecting the succeeding element 2 next to the preceding element 1 will be described.
As shown in FIG. 1, the preceding element 1 is composed of a reinforcing bar base 10 and concrete (not shown).

As shown in FIG. 1, the reinforcing bar base 10 includes a base body 11, a reinforcing bar 12, and a pair of water stop plate attachment members 13.
The gantry body 11 supports the reinforcing bar 12 and is formed by combining steel materials.

The gantry body 11 of the present embodiment is disposed in the inner space of the reinforcing bar 12 and extends in the height direction (perpendicular to the paper surface).
The gantry body 11 includes a cross member 111 disposed on each of the front side and the rear side (upper side and lower side in FIG. 1), and a vertical member 112 that connects the front and rear cross members 111. The configuration of the gantry body 11 is not limited.

Although the material which comprises the crosspiece 111 is not limited, L-shaped steel is used in this embodiment.
The cross member 111 is disposed along the wall surface of the excavation groove excavated when the preceding element is constructed.

In the present embodiment, the four vertical members 112 are placed between the two cross members 111 so as to have a ladder shape in plan view.
In addition, although the material which comprises the vertical member 112 is not limited, L-shaped steel is used in this embodiment.

The vertical member 112 disposed on the right side of the gantry body 11 is connected via an oblique member 113. The same applies to the longitudinal member 112 arranged on the left side of the gantry body 11.
In addition, a space for piping the tremy pipe P is secured between the adjacent vertical members 112 in the central portion of the reinforcing bar 10.

The diagonal member 113 is made of flat steel arranged in an X shape between two longitudinal members 112.
The material constituting the diagonal material 113 is not limited.

On the front surface and the rear surface of the gantry body 11 (cross member 111), rebar reinforcing bars (lattice reinforcing bars) 121 formed by combining vertical bars and horizontal bars are arranged. The reticulated reinforcing bar 121 is fixed to the front surface and the rear surface of the gantry body 11 and forms the reinforcing bar rod 12.
It should be noted that the diameters of reinforcing bars and the pitch of the reinforcing bars constituting the reinforcing bar 12 are not limited, and may be set as appropriate.

In addition, a pair of water stop plate attachment members 13 are fixed to both end portions (left and right end portions in FIG. 1) of the gantry body 11.
The water stop plate attachment member 13 is a plate member disposed at a boundary portion between the preceding element 1 and the succeeding element 2, and is fixed to a longitudinal member 112 disposed on the succeeding element 2 side. The water stop plate attachment member 13 extends in the height direction (the direction perpendicular to the paper surface).

As shown in FIGS. 2 and 3A, the water stop plate attachment member 13 is formed in a cylindrical shape by combining the base member 131 and the cover material 132, and is continuous in the depth direction of the excavation groove. A space is formed.
The base member 131 includes a holding portion 133 to which a water stop plate can be attached, and a pair of plate members 134 provided so as to face each other with the holding portion 133 interposed therebetween.

The holding part 133 is made of a pipe material. A slit 135 opening on the cover material 132 side (following element side) is formed in the tube material constituting the holding portion 133, and is formed in a C shape in a sectional view (plan view).
As shown in FIG. 3B, a water stop plate 14 is attached to the holding portion 133 when the trailing element is installed.

In this embodiment, a steel pipe is adopted as the pipe material constituting the holding portion 133, but the material constituting the holding portion 133 may be selected according to construction conditions and necessary water stop performance.
Further, the cross-sectional shape of the holding portion 133 is not limited to the C shape. Further, the holding portion 133 is not necessarily formed of a tube material, and may be a plate material in which a slit is processed on one side of a hollow rectangular cross section, for example.

  The preceding element side water stop plate 15 made of a steel plate is welded to the outer surface of the holding portion 133 opposite to the slit 135. The leading element side water stop plate 15 prevents water penetration from the leading element 1 side of the base member 131.

By sticking a water-stopping tape 140 that shields the slit 135 to the holding portion 133 of the reinforcing bar 10, it is possible to prevent the preceding concrete from flowing into the holding portion 133. In addition, when the adhesiveness of the base member 131 and the cover material 132 is good and there is no concern about the inflow of concrete, the use of the water blocking tape 140 is not limited.
Although the material which comprises the water stop tape 140 is not limited, For example, what is necessary is just to use an adhesive tape.

  The plate material 134 of the present embodiment is made of a so-called T-shaped steel (CT-shaped steel), and includes a protrusion (web) 136 that protrudes on the opposite side of the trailing element 2. The protrusion (web) 136 included in the plate member 134 prevents water from penetrating from the preceding element 1 side of the base member 131.

The side edge of the plate 134 on the holding portion 133 side is welded to the outer surface of the holding portion 133. In addition, a bolt hole (not shown) is formed at the end of the plate 134 opposite to the holding portion 133. Further, on the surface of the plate member 134 on the cover member 132 side, a protrusion 134 a for preventing the shift of the cover member 132 is formed corresponding to the position of the corner between the curved portion 137 and the attachment portion 138 of the cover member 132. Yes. However, when there is no concern about the displacement of the cover material 132, the protrusion 134a may not be provided.
In addition, the structure of the board | plate material 134 is not limited, For example, a flat plate may be sufficient and a corrugated board | plate material may be sufficient. The plate material 134 is a plate body having the same height as the entire height of the element.

As shown in FIG. 1, the base member 131 is fixed to the gantry body 11 (vertical member 112) via a fixing member 16.
In the present embodiment, channel steel is used as the fixing member 16.

The fixing member 16 connects the base member 131 and the gantry body 11 by welding one of the pair of flanges to the base member 131 and the other to the vertical member 112.
The arrangement of the fixing material 16 is not limited. Moreover, the material which comprises the fixing material 16 is not limited, For example, H-section steel may be sufficient.

The cover material 132 is made of a material that can be cut by a ground excavator, and covers the holding portion 135 as shown in FIG.
The cover member 132 is a cross-sectional hat in a plan view by a curved portion 137 having a cross-sectional shape that protrudes toward the trailing element side and a pair of attachment portions 138 that are bent and extended from both ends of the curved portion 137 to the side. It is formed in a shape.

  The attachment portion 138 is overlaid on the base member 131 and fixed to the base member 131 by fastening a bolt 139 passing through the attachment portion 138 and the bolt hole of the base member 131 to the nut.

The cover member 132 forms a space between the cover member 132 and the base member 131 by the curved portion 137 and covers the holding portion 133. The cover material 132 of this embodiment is comprised by the member made from a vinyl chloride.
The material constituting the cover material 132 is not limited as long as it can be cut by a ground excavator. For example, a resin material such as acrylic resin is used in addition to ALC (lightweight cellular concrete), fiber reinforced concrete, and the like. do it. The cross-sectional shape of the cover member 132 is not limited as long as it forms a cavity with the base member 131 and can cover the holding portion 133. Furthermore, the cover material 132 may be formed by a single member or may be formed by combining a plurality of members.

As shown in FIG. 3B, the water stop plate 14 is installed by inserting an end portion into the holding portion 133. The water stop plate 14 is inserted from the upper end side of the holding portion 133. The waterproofing tape 140 attached to the holding part 133 is peeled off by inserting the waterproofing plate 14. Further, the water stop plate 14 is installed so that the plate-like portion 141 is sandwiched between the water stop plate guides 23 (see FIG. 5B).
In addition, although the example which installs the water stop board 14 after installing the reinforcing bar base 20 was shown in the said procedure, the water stop board 14 may be previously attached to the reinforcing bar base 20, and the method of installing the reinforcing bar base 20 may be taken.

The water stop plate 14 of this embodiment includes a plate-like portion 141 made of a steel plate and a locking portion 142 provided at an end of the plate-like portion 141. The locking part 142 is made of a steel pipe and is welded to one end of the plate-like part 141.
The thickness of the plate-like portion 141 is smaller than the slit 135. On the other hand, the width (outer diameter) of the locking portion 142 is larger than that of the slit 135.

  The construction method of the continuous underground wall of the present embodiment includes a preceding excavation step, a preceding reinforcement step, a preceding concrete placement step, a subsequent excavation step, a subsequent placement step, and a subsequent concrete placement step. And.

The preceding excavation step is a step of excavating the preceding excavation groove D1 as shown in FIG.
The preceding excavation groove D1 is excavated by a ground excavator such as a trench cutter. In addition, the excavation method of a preceding excavation groove is not limited.

As shown in FIG. 4B, the preceding bar arrangement step is a step of installing the reinforcing bar mount 10 in the preceding excavation groove D1.
At this time, the spacer 18 is interposed between the reinforcing bar mount 10 and the inner wall surface of the preceding excavation groove D1. The material, shape and arrangement of the spacer 18 are not limited.

  When the reinforcing bar mount 10 is installed in the preceding excavation groove D1, the tremy pipe P is piped in the center of the reinforcing bar mount 10 (between the vertical members 112 on the center side). The tremy tube P is inserted until the tip (lower end) reaches the vicinity of the bottom of the preceding excavation groove D1.

As shown in FIG. 4 (c), the preceding concrete placing step is a step of placing the concrete in the preceding excavation groove D1 to form a leading element.
Concrete is cast from the bottom surface of the preceding excavation groove D1 using the tremy pipe P. The tremy pipe P is raised as the upper surface of the cast concrete is raised. At this time, since the cylindrical portion surrounded by the base member 131 and the cover member 132 is defined, concrete is not placed.

The subsequent excavation step is a step of excavating a subsequent excavation groove D2 continuous with the preceding excavation groove D1, as shown in FIG. 4 (d).
The subsequent excavation process is performed after a predetermined strength is exerted on the cast concrete (preceding element 1) in the preceding excavation groove D1.

The excavation of the subsequent excavation groove D2 is performed while cutting the end portion of the preceding element. In addition, excavation of the trailing excavation groove D2 is performed by a ground excavator (not shown) similarly to the preceding excavation groove D1.
Since the cover material 132 provided at the end of the preceding element 1 is cut by excavating the subsequent excavation groove D2, the base member 131 (holding portion 133) is exposed.

The succeeding bar arrangement process is a process of installing the reinforcing bar mount 20 (see FIG. 5A) for the succeeding element 2 in the succeeding excavation groove D2.
In this embodiment, the reinforcing bar rod 22 is installed using the reinforcing bar base 20.

  The configuration of the reinforcing bar base 20 for the trailing element 2 includes a base body 21 and a reinforcing bar rod 22 as in the case of the reinforcing bar base 10 for the preceding element 1, but has a water stop plate attachment member 13. Absent. The details of the gantry body 21 and the reinforcing bar rod 22 are the same as those of the gantry body 11 and the reinforcing bar rod 12 for the preceding element 1.

A spacer (not shown) is interposed between the reinforcing bar mount 20 and the inner wall surface of the subsequent excavation groove D2. The material, shape and arrangement of the spacer are not limited.
When the reinforcing bar base 20 is arranged, a tremy pipe (not shown) is piped in the center of the reinforcing element rod 21 for the succeeding element. The tremy pipe P is inserted to the vicinity of the bottom of the preceding excavation groove D1.

  In the present embodiment, a water stop plate guide member 23 is projected from the end of the reinforcing bar 20 on the preceding element 1 side. The water stop plate guide member 23 can prevent the direction of the water stop plate from deviating greatly from the continuous wall axis.

  The water stop plate guide member 23 of the present embodiment is formed by fixing L-shaped steel to the vertical member 212, but the structure of the water stop plate guide member 23 is not limited. Moreover, the number and arrangement | positioning of the water stop plate guide member 23 attached to the height direction of a reinforcing bar mount are not limited.

  Next, as shown in FIG. 5 (b), the water stop plate 14 is installed in the holding portion 133 of the base member 131 exposed by excavation of the subsequent excavation groove D2.

  The locking portion 142 of the water stop plate 14 is inserted into the inner space (the inner space of the pipe material) of the holding portion 133, and the base end portion (the end portion on the locking portion 142 side) of the plate-shaped portion 141 is inserted into the slit 135. By inserting the locking portion 142 into the inner space of the holding portion 133, the water stop plate 14 is prevented from coming out.

As shown in FIG. 3 (b), contact plates 143 made of spring steel plates are provided on both ends of the plate-like portion 141.
When one end of the water stop plate 14 is inserted into the holding portion 133, the contact plate 143 comes into contact with the outer surface of the holding portion 133 and the slit 135 of the holding portion 133 is covered. Thereby, the approach of the concrete to the inside of the holding part 133 is prevented.
In addition, the structure of the water stop board 14 and the attachment method of the water stop board 14 are not limited. Further, the contact plate 143 may be installed as necessary.

The subsequent concrete placing step is a step of placing concrete in the subsequent excavation groove D2 as shown in FIG. 5 (c).
The concrete is placed from the bottom surface of the subsequent excavation groove D2 using the tremy pipe P. The concrete is placed in a state where the water stop plate 14 is wound. Further, the tremy pipe P is raised as the upper surface of the cast concrete is raised.

  At this time, the concrete is prevented from flowing into the holding portion 133. In the present embodiment, water is poured from the upper part of the locking part 142 into the hollow part of the locking part 142, and the water that has permeated from the lower end of the locking part 142 is drained from the upper part between the locking part 142 and the holding part 133. By doing so, the water is circulated to prevent the concrete from entering the holding portion 133.

  Subsequently, grout is injected from the upper end of the hollow portion of the locking portion 142 of the water stop plate 14. The inside of the holding portion 133 is filled by the grout penetrating from the lower end of the locking portion 142 to the outer periphery of the locking portion 142.

As mentioned above, according to the construction method of the continuous underground wall of this embodiment, since the water stop plate attachment member 13 is used, the continuous ground where the water stop of the junction part of the preceding element 1 and the succeeding element 2 was excellent. The inner wall can be constructed easily.
That is, since the cover material 132 having a hat-shaped cross section is used, there is no fear that the excavator interferes with the holding portion 133 during excavation of the subsequent excavation groove D2, and construction is easy.

  Moreover, since the water stop board 14 is not installed at the time of construction of the subsequent excavation ditch D2, there is no fear that the water stop board 14 will be damaged. Moreover, it becomes possible to install the water stop board 14 of a bigger size than before by performing the water stop board 14 after excavation of the subsequent excavation groove D2, and can improve water stop.

Moreover, since installation is completed only by inserting the water stop board 14 in the holding | maintenance part 133, it is excellent in workability.
Further, the locking portion 142 of the water stop plate 14 is locked to the holding portion 133, and the plate-like portion 141 is interposed between the water stop plate guides 23, so that the water stop plate 14 accompanying the placement of concrete or the like. The tilt of the is prevented.

By cutting the cover material 132 when excavating the subsequent excavation groove D2, irregularities are formed on the end face of the preceding element 1 (see FIG. 4D). Bondability is improved (structural performance is ensured). Moreover, since the joining surface of the preceding element 1 and the succeeding element 2 is bent, the water stoppage is improved by lengthening the water passage extension of water leaking through the joining surface.
Since the holding part 133 is filled with grout, the water stoppage at the joint between the water stop plate 14 and the holding part 133 is also ensured. Further, the water stop plate guide improves the cross-sectional force transmission performance between the elements.

  The embodiment of the present invention has been described above. However, the present invention is not limited to the embodiment, and the above-described constituent elements can be appropriately changed without departing from the spirit of the present invention.

  For example, in the said embodiment, although the L-shaped steel was fixed to the edge part of the reinforcing bar mount 20 for the succeeding elements 2 as the water stop plate guide member 23, the transmission performance of the cross-sectional force between the elements 1 and 2 is improved. The member is not limited to this. For example, as shown in FIG. 6A, the reinforcing bar 24 inserted into the concave portion at the end of the preceding element 1 formed by excavation of the trailing excavation groove D <b> 2 may be fixed to the reinforcing bar base 20.

Moreover, you may provide the cross-sectional force transmission member (rebar etc.) arrange | positioned ranging over the preceding element and the succeeding element.
The material and shape which comprise a cover material are not limited, For example, as shown in FIG.6 (b), the semi-cylindrical thing which divided the vinyl chloride pipe into 2 parts may be sufficient. In that case, the attachment piece 134b is provided in the board | plate material 134, and it bolts.

DESCRIPTION OF SYMBOLS 1 Leading element 10 Reinforcement frame 11 Mounting frame main body 12 Reinforcement rod 13 Water stop plate attachment member 131 Base member 132 Cover material 133 Holding part 134 Plate material 135 Slit 137 Curved part 14 Water stop plate 2 Subsequent element D1 Precise excavation groove D2 Subsequent excavation groove

Claims (5)

A water stop plate mounting member provided at the boundary between the preceding element and the succeeding element,
It is formed in a cylindrical shape by combining the base member and the cover material,
The base member is formed with a holding portion capable of holding a water stop plate,
The water-stop plate mounting member, wherein the cover material has a curved portion that covers the holding portion and is made of a material that can be cut by a ground excavator.   The base member is formed by integrally forming a tube material in which a slit serving as the holding portion is formed and a pair of plate materials provided so as to face each other with the tube material interposed therebetween. The water-stop plate attachment member as described in 2. A waterstop plate comprising a plate-like portion and a locking portion formed at an end of the plate-like portion,
A water stop plate, which is held by the holding portion of the water stop plate mounting member according to claim 1 or 2. The gantry body for the construction of the preceding element,
A rebar rod supported by the gantry body;
A rebar gantry comprising a pair of water stop plate attachment members fixed to both ends of the gantry body,
The water stop plate mounting member is formed in a cylindrical shape by combining a base member and a cover material,
The base member has a holding portion for attaching a water stop plate,
The cover material is made of a material that can be cut by a ground excavator, and has a curved portion that covers the holding portion. A pre-excavation process for excavating a pre-excavation ditch in the ground for constructing the underground wall;
A preceding bar arranging step of installing the reinforcing bar mount according to claim 4 in the preceding excavation groove;
A preceding concrete placing step of placing concrete in the preceding excavation groove;
A subsequent excavation step of excavating a subsequent excavation groove continuous to the preceding excavation groove;
A follow-up barbing step of installing a rebar mount for a follow-up element in the follow-up excavation groove;
A subsequent concrete placement step for placing concrete in the subsequent excavation groove, and a construction method for a continuous underground wall,
In the subsequent excavation step, cutting the cover material together with excavation of the subsequent excavation groove,
A construction method for a continuous underground wall, characterized in that, in the subsequent reinforcement step, a water stop plate is installed in the holding portion.

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