JPH081063B2 - Underground continuous wall construction method and underground continuous wall construction formwork - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground continuous wall construction method and an underground continuous wall construction formwork which are carried out, for example, in construction of a retaining wall for root cutting work and an outer wall of an underground structure.

[0002]

2. Description of the Related Art Generally, the earth retaining wall and the outer wall of an underground structure are required to be prevented from collapsing the ground and have a water stopping property.

[0003]

However, in cast-in-place reinforced concrete, all the work is performed on-site, so that labor saving on site construction can hardly be performed. In addition, it is necessary to secure a sufficient curing period for concrete, which inevitably prolongs the construction period. Furthermore, since concrete is directly placed in the excavation hole without using a formwork, the surface in contact with the soil becomes the finished surface as it is, so the finished surface is rough.
The construction accuracy was poor and it was necessary to perform additional finishing work such as surface chipping work.

Further, since the construction is carried out by dividing into fixed sections, the construction of the splice joint between the sections is troublesome, and if the splice joint is defective, sufficient strength cannot be obtained.
Water may not be stopped sufficiently.

Further, there has been a problem that the structure of the joint portion with the orthogonal member such as a beam to be post-constructed is complicated and the construction of the joint portion tends to be troublesome.

The present invention has been made in order to solve the above problems, and it is possible to omit or shorten the on-site construction and to greatly shorten the construction period. The purpose is to provide a construction formwork.

[0007]

In the underground continuous wall construction method according to the first aspect of the present invention, a vertical hole is excavated, and the side plates facing each other are a PC plate and a PC plate. steel sheet,
Or build an underground continuous wall construction formwork consisting of PC board and lattice reinforcement, backfill the surroundings of this underground continuous wall construction formwork, and put concrete in this underground continuous wall construction formwork. Next, a vertical hole is newly drilled in succession to the vertical hole, and a new underground continuous wall building form is built in this vertical hole. This underground continuous wall building form and the underground continuous wall Joining the construction formwork, and backfilling around the underground continuous wall construction formwork,
Next, concrete is poured into the underground continuous wall construction formwork.

In the underground continuous wall construction method according to the second aspect of the present invention, a vertical hole is excavated, an underground continuous wall building form is built in the vertical hole, and the underground continuous wall building type is constructed. Backfill the perimeter of the frame, then excavate a new vertical hole continuously to the vertical hole, build a new underground continuous wall construction formwork in this vertical hole,
This underground continuous wall construction formwork and the underground continuous wall construction formwork are joined together, a rebar cage is built in the joint portion, and the periphery of this underground continuous wall construction formwork is backfilled, To
It is characterized in that concrete is placed at a joint portion between the underground continuous wall construction form and the underground continuous wall construction form.

The underground continuous wall construction form according to the third aspect of the present invention is formed of a steel plate in a rectangular cross-section, and has a plurality of shear connectors and a plurality of stiffening members protruding from the inner side. And stiffening members are connected by a tie plate.

According to a fourth aspect of the present invention, an underground continuous wall construction formwork has a rectangular cross section formed from a steel plate, and has a plurality of shear connectors and a plurality of stiffening members projecting inside thereof. The present invention is characterized in that a plurality of joint reinforcing bars are provided at the left and right edge portions, and a curing cover for protecting the joint reinforcing bars is detachably attached to the outside thereof.

According to a fifth aspect of the present invention, an underground continuous wall building formwork has a rectangular cross section, one of the facing side plates is formed of a steel plate or a PC plate, and the other side plate is a lattice reinforcing bar. It is characterized by being formed more.

According to a sixth aspect of the present invention, an underground continuous wall construction formwork has a rectangular cross section, and the side plates facing each other are formed of PC plates, and the side plates and the side plates are formed into a plurality of pieces. It is characterized in that they are connected by a connecting member, and an uneven sea connector is formed on the inner side portion of the side plate.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an illustrated embodiment. FIGS. 1 to 9 show an embodiment of a method for constructing an underground continuous wall according to claim 1, and In the method, an underground continuous wall construction formwork (hereinafter referred to as “formwork”) as shown in FIG. 10 is used.

The mold 1 is made of steel plate and has a rectangular cross section.
On the inner side of the side plates 1a, 1a, a plurality of shear connectors 2 such as stud bolts for integration with concrete 7 to be described later are provided over the entire surface of the side plate 1a, and the rigidity of the entire formwork is increased. A plurality of stiffeners 3 and 3 made of chevron and the like are provided in order to increase the height, and the opposing stiffeners 3 and 3 are integrally connected by a tie plate 4.

Next, a method of constructing a continuous underground wall according to the present invention will be described.

(1) First, a vertical hole 5 having a predetermined depth is excavated in the ground (see FIG. 1). Excavation of the vertical hole 5 is performed by a conventional excavation method such as an earth auger method, and is slightly larger than the lateral width and thickness of the formwork 1 (see FIG. 1).

(2) Next, the mold 1 is press-fitted or hung in the vertical hole 5 to be built (see FIG. 2), and the periphery thereof is filled with a filler 6 such as gravel. The peripheral part is backfilled, the formwork 1 is fixed in the vertical hole 5 so as not to move, and
Make sure that the inner wall of the vertical hole 5 does not collapse (see FIG. 3).

(3) Next, concrete 7 is placed in the mold 1 (see FIG. 4).

(4) Next, a new vertical hole 8 is provided adjacent to the vertical hole 5.
Excavate (see FIG. 5). The vertical hole 8 is made continuous by excavating the vertical hole 5 partially overlapping with the previous vertical hole 5.

(5) Next, a form 9 having the same structure as the form 1 is built in the vertical hole 8 and integrally joined to the form 1 previously built (see FIGS. 6 and 7). ). The formwork 1 and the formwork 9 are integrally joined by butt welding the edge portions of both side plates 1a and 9a.

Further, the peripheral portion of the mold 9 is filled with the filling material 6 to backfill the peripheral portion of the mold 9 to fix the mold 9 in the vertical hole 8 so as not to move.

(6) Next, concrete 7 is placed in the mold 9 (see FIG. 7).

In the same manner, excavation of vertical holes, erection and connection of formwork, and placing concrete 7 on the formwork are alternately repeated to construct an underground continuous wall (see FIG. 9).

When constructing a structure having a basement, the underground continuous wall of the core portion A at the center of the structure is also constructed in parallel with the construction of the underground continuous wall (FIGS. 11 and 12). And Figure 13).

In this case, the underground continuous wall of the core portion A is constructed in a rectangular shape in the same manner as the construction method of the underground continuous wall,
Prop 10 made of H-shaped steel or square steel pipe at the corner
The mold 1 and the column 10 are integrally joined by welding.

Then, concrete 7 is placed in each form 1, and immediately after that, assembling of the columns 11 and the beams 12 of the upper structure is started. In addition, excavation of the lower ground will be performed in parallel with this assembly. In this case, the pillars 11 of the upper structure are built on the pillars 10, and truss beams or the like are used for the beams 12 (see FIG. 13).

Further, in order to join a beam such as a cut beam to an underground continuous wall, a column 13 made of H-shaped steel or rectangular steel pipe is installed between the frames, and the beam is attached to the column 13. Weld the ends of 14 (see Figures 14 and 15). When the beam 14 is a simple member such as a beam, the beam 14 is directly welded to the side plate of the formwork 1 to join the beam 14 to the welded portion of the beam 14 of the formwork 1 to form an H-shaped steel or plate. Reinforce by attaching stiffeners 15 (see Figures 16 and 17).

Further, the surface of the side plate 1a of the mold 1 is subjected to necessary finishing. In this case, since the molds 1 and 9 are made of a structural steel plate, the finishing work is easy, and in some cases, it is possible to simply finish the painting.

18 to 24 show an underground continuous wall construction method using an underground continuous wall construction form (hereinafter referred to as "form") according to claim 3, and this construction method is illustrated. Such a formwork 16 is used.

The formwork 16 is made of a steel plate and has a rectangular cross-section like the formwork 1, and a plurality of joining reinforcing bars 17, 1 are provided at the left and right edge portions thereof.
7 is projected. The joining rebars 17, 17 are horizontally projected at regular intervals in the vertical direction of the formwork 16. Also the formwork
A curing cover 18 for curing the jointed reinforcing bars 17 is detachably attached to the left and right edge portions of 16. The other structure is substantially the same as that of the mold 1.

In the construction described above, the construction method will be described next. Excavation of the vertical hole 5, building of the form 16,
The filling of the filling material 6 and the placing of the concrete 7 are substantially the same as those in the previous embodiment.

Explaining the difference, the curing covers 18 are attached to the left and right edge portions of the mold 16 when the mold 16 is built (see FIG. 19). The curing cover 18 is for protecting the jointed reinforcing bars 17 from being deformed or soiled during construction, and can be freely removed and repeatedly used.

Further, after the vertical hole 8 is newly drilled adjacent to the vertical hole 5, the curing cover 18 is pulled out, and then a new mold 16 is built in the vertical hole 8 (see FIG. 23). . In such cases,
The formerly built-in mold 16 and the end of the newly built-in mold 16 are overlapped with the joining reinforcing bars 17 and 17, which are respectively projected, and are welded in some cases. Then, concrete 7 is placed in the newly built form 16 and at the joint between the form 16 and the form 16 previously built (see FIG. 24).

25 to 31 show an underground continuous wall construction method using the underground continuous wall construction form (hereinafter referred to as "form") according to claim 5, and the construction method is shown in FIG. A formwork 19 as shown at 32 is used.

Of the side plates of the formwork 19, one side plate 19a is P
It is formed of a C plate, and the other side plate 19b is formed of a lattice reinforcing bar. Further, in order to enhance the integration with the concrete 7 described later, an uneven scotter 20 which is continuous in the vertical direction is formed over the entire side plate 19a inside the side plate 19a.

33 to 36 show an underground continuous wall construction method using the underground continuous wall construction formwork (hereinafter referred to as "form") according to claim 6, and in this construction method, , Fig. 33
A formwork 21 as shown in FIG.

The side plates 21a, 21a of the mold 21 are both formed of PC plates, and inside thereof, an uneven scotter 20 which is continuous in the vertical direction is formed in order to enhance integration with the concrete 7 which will be described later. It is formed all over.
Opposing side plates 21a and 21a are integrally connected by a plurality of connecting members 22 made of a reinforcing bar, a steel material or the like.

Incidentally, one of the facing side plates 21a, 21a may be a composite structure in which one is formed of a PC plate and the other is formed of a steel plate (see FIG. 37).

In this construction, the construction method will be described. Excavation of vertical holes, building of formwork, filling of filling material and placing concrete 7 are substantially the same as in the previous embodiment.

Explaining the different points, after the formwork 21 is built in, the rebar cage is attached to the joint between the adjacent formwork 21 and 21.
23 is built (see FIG. 34), and concrete 7 is placed at the joint between the forms 21 and 21.

When the underground continuous wall to be constructed is deep, the length is adjusted by adding the formwork 21 up and down. In such a case, the side plate 21 of the upper and lower mold 21
Complete waterproofing is achieved by joining and joining the joints of a and 21a (see Fig. 36).

[0042]

Since the present invention is constructed as described above, it has the following effects. (1) Since the underground continuous wall construction formwork (formwork) is used instead of using the reinforcing steel, work such as assembling the formwork and arranging bars is not required at all, simplifying on-site construction, and reducing the construction period. It can be shortened significantly.

(2) The opposite side plates of the mold are both PC
Since it is formed from a plate, a PC plate and a steel plate, or a PC plate and a lattice rebar, it can be used as a finished surface as it is,
It is possible to omit post-work such as chipping, which was always necessary for conventional cast-in-place concrete work.

(3) When a horizontal member such as a beam is erected on a continuous underground wall, it can be joined to a pillar set up in a formwork by welding or the like, so that it can be easily joined and integrated. Become.

(4) Not only as a mountain retaining wall for root cutting work, but also as a bearing wall or an outer wall of an underground structure, the range of application is extremely wide. Also, when constructing an underground structure, if concrete is placed in the formwork, the pillars of the upper structure can be immediately erected on the formwork without waiting for the curing of the concrete. And construction of the upper structure can be performed at the same time, and the construction period can be greatly shortened.

(5) After the underground continuous wall construction formwork was built in the vertical hole, the periphery thereof was completely backfilled with a filler to fix the underground continuous wall construction formwork in the vertical hole, Since concrete is placed in the underground continuous wall construction form, it is possible to prevent the underground continuous wall from being tilted during the placing of concrete and the subsequent construction, thereby improving the construction accuracy. Further, by constructing the underground continuous wall construction form by forming the vertical holes to be slightly larger, the underground continuous wall can be easily built.

(6) The underground continuous wall construction formwork is constructed, for example, from a steel plate in a rectangular cross-sectional shape, a plurality of shear connectors and a plurality of stiffening members are provided on the inner side of the formwork, and Since the rigid members are connected by the tie plate, not only the rigidity of the mold itself is extremely high, but also the rigidity is further increased by being completely integrated with the concrete poured into the mold.

(7) Reinforcing cages are built in the joints of the underground continuous wall construction formwork, and concrete is placed at the joints of the underground continuous wall construction formwork and the underground continuous wall construction formwork. Therefore, there is an effect that the strength of the joint and the waterproof property can be improved by completely integrating the joint.

[Brief description of drawings]

FIG. 1 is a plan view showing one step of an underground continuous wall construction method according to the present invention.

FIG. 2 is a plan view showing one step of the underground continuous wall construction method according to the present invention.

FIG. 3 is a plan view showing one step of the underground continuous wall construction method according to the present invention.

FIG. 4 is a plan view showing one step of the method for constructing an underground continuous wall according to the present invention.

FIG. 5 is a plan view showing one step of a method for constructing an underground continuous wall according to the present invention.

FIG. 6 is a plan view showing one step of the underground continuous wall construction method according to the present invention.

FIG. 7 is a plan view showing one step of the underground continuous wall construction method according to the present invention.

FIG. 8 is a plan view showing one step of a construction method of the underground continuous wall construction method according to the present invention.

FIG. 9 is a plan view showing one step of the underground continuous wall construction method according to the present invention.

FIG. 10 is a plan view of an underground continuous wall construction form according to the present invention.

FIG. 11 is a plan view showing one step of a method for constructing an underground structure by the underground continuous wall construction method according to the present invention.

FIG. 12 is a plan view showing one step of a method for constructing an underground structure by the underground continuous wall construction method according to the present invention.

FIG. 13 is a partial perspective view of an underground structure showing one step of the method for constructing an underground structure by the underground continuous wall construction method according to the present invention.

FIG. 14 is a partial plan view of an underground continuous wall constructed by the underground continuous wall construction method according to the present invention.

FIG. 15 is a partial plan view of an underground continuous wall constructed by the underground continuous wall construction method according to the present invention.

FIG. 16 is a partial plan view of an underground continuous wall constructed by the underground continuous wall construction method according to the present invention.

FIG. 17 is a partial plan view of an underground continuous wall constructed by the underground continuous wall construction method according to the present invention.

FIG. 18 is a plan view showing one step of the method for constructing an underground continuous wall according to the present invention.

FIG. 19 is a plan view showing one step of the underground continuous wall construction method according to the present invention.

FIG. 20 is a plan view showing one step of the method for constructing an underground continuous wall according to the present invention.

FIG. 21 is a plan view showing one step of a method for constructing an underground continuous wall according to the present invention.

FIG. 22 is a plan view showing a step of the method for constructing an underground continuous wall according to the present invention.

FIG. 23 is a plan view showing one step of a method for constructing an underground continuous wall according to the present invention.

FIG. 24 is a plan view showing one step of the underground continuous wall construction method according to the present invention.

FIG. 25 is a plan view showing one step of the underground continuous wall construction method according to the present invention.

FIG. 26 is a plan view showing one step of a method for constructing an underground continuous wall according to the present invention.

FIG. 27 is a plan view showing one step of the method for constructing an underground continuous wall according to the present invention.

FIG. 28 is a plan view showing one step of the method for constructing an underground continuous wall according to the present invention.

FIG. 29 is a plan view showing one step of the method for constructing an underground continuous wall according to the present invention.

FIG. 30 is a plan view showing one step of the method for constructing an underground continuous wall according to the present invention.

FIG. 31 is a plan view showing one step of a method for constructing an underground continuous wall according to the present invention.

FIG. 32 is a plan view of an underground continuous wall construction form according to the present invention.

FIG. 33 is a plan view showing a step of the method for constructing an underground continuous wall according to the present invention.

FIG. 34 is a perspective view showing one step of an underground continuous wall construction method according to the present invention.

FIG. 35 is a partial plan view of an underground continuous wall constructed by the underground continuous wall construction method according to the present invention.

FIG. 36 is a partial longitudinal sectional view of an underground continuous wall constructed by the underground continuous wall construction method according to the present invention.

FIG. 37 is a partial plan view of the underground continuous wall construction form according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Underground continuous wall construction formwork (formwork), 2 ... Shear connector-, 3 ... Stiffening material, 4 ... Tie plate, 5 ... Vertical hole, 6 ... Filler material, 7 ... Concrete, 8 ... Vertical hole, 9 ... Underground continuous wall construction formwork (form), 10 ... Struts, 11 ... Upper structure columns, 12 ... Upper structure beams, 13 ... Struts, 14 ... Beams, 15 ... Brackets, 16 ... Underground Continuous wall construction formwork (formwork), 17 ... Joint rebar, 18 ...
Curing cover, 19… Underground continuous wall construction formwork (formwork), 20… Shacotter, 21… Underground continuous wall construction formwork (formwork), 22… Coupling member, 23…
Reinforcing basket.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hitoshi Yoshida 4-51 Ota-cho, Naka-ku, Yokohama, Kanagawa Kashima Construction Co., Ltd. Yokohama Branch (72) Inventor Sadao Kondo 4-Ota-cho, Naka-ku, Yokohama-shi, Kanagawa 51 Kashima Construction Co., Ltd. Yokohama Branch (72) Inventor Kuniaki Sato 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Yoichi Nojiri 2--19 Tobita, Chofu-shi, Tokyo No. 1 Kashima Construction Co., Ltd. Technical Research Institute (72) Inventor Yasuo Noda 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Inside Kashima Construction Co., Ltd. (72) Inventor Masahiko Hanamura 1-2-Chome, Moto-Akasaka, Minato-ku, Tokyo No. 7 within Kashima Construction Co., Ltd. (56) Reference JP-A-3-76922 (JP, A) JP-A-57-151725 (JP, A) JP-B 44-29104 (JP, B1) JP-B 6-63 227 (JP, B2) Jikkyohei 3-55626 (JP, Y2)

Claims (6)

[Claims] 1. A vertical hole is excavated, and an underground continuous wall construction formwork, in which opposing side plates are both PC plates, PC plates and steel plates, or PC plates and lattice reinforcing bars, is installed in the vertical holes. The surroundings of the underground continuous wall construction form are backfilled, concrete is placed in this underground continuous wall construction form, and then a new vertical hole is continuously drilled from the vertical hole. A new underground continuous wall construction form is built in the hole, this underground continuous wall construction form is joined to said underground continuous wall construction form, and then the surroundings of this underground continuous wall construction form Backfilling, and then pouring concrete into the underground continuous wall construction formwork. 2. A vertical hole is excavated, an underground continuous wall building formwork is built in the vertical hole, the periphery of the underground continuous wall building form is backfilled, and then the vertical hole is continuously formed. A new vertical hole is excavated, a new underground continuous wall construction form is built in this vertical hole,
This underground continuous wall construction formwork and the underground continuous wall construction formwork are joined together, a rebar cage is built in the joint portion, and the periphery of this underground continuous wall construction formwork is backfilled, To
A method for constructing an underground continuous wall, wherein concrete is placed at a joint between the underground continuous wall building form and the underground continuous wall building form. 3. A steel sheet having a rectangular cross-section, a plurality of shear connectors and a plurality of stiffening members protruding from the inner side of the steel sheet.
An underground continuous wall construction formwork, characterized in that the stiffeners are connected by a tie plate. 4. A steel sheet having a rectangular cross-section and a plurality of shear connectors and a plurality of stiffening members protruding from the inner side of the steel sheet,
An underground continuous wall construction formwork, characterized in that a plurality of joint reinforcing bars are projected on the left and right edge portions, and a curing cover for protecting the joint reinforcing bars is detachably attached to the outside thereof. 5. An underground continuous wall construction formwork having a rectangular cross section, wherein one of the opposing side plates is formed of a steel plate or a PC plate and the other side plate is formed of a lattice reinforcing bar. 6. A rectangular cross-section is formed, and opposing side plates are made of P.
A continuous underground wall construction characterized in that it is formed of a C plate, and the side plate and the side plate are connected by a plurality of connecting members, and an uneven sea connector is formed on the inner side of the side plate. Formwork.