JP2939616B1 - Pit construction method for parking facilities, etc. - Google Patents

Abstract

[Summary] [Problem] Temporary facilities are not required, post-construction and waste material treatment can be reduced, construction on site is reduced, construction is easy, construction period can be shortened, and good quality can be obtained. Also, materials can be easily brought into the site by truck. Also, it is difficult for the groundwater level to rise after the facility. An underground space having a required volume for parking or the like is secured by excavating the ground, and a plurality of precast concrete panels 2 are juxtaposed on a peripheral wall portion of the underground space and surrounded by the panels 2. A pit 1 for constructing a parking lot or the like is constructed by placing a bottom plate finishing concrete 19 at the bottom of the underground space.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a pit for an underground parking facility or the like for forming a mechanical parking facility.

[0002]

2. Description of the Related Art For example, in a mechanical parking facility, there is a type in which a basement is excavated to form a pit for the parking facility in this underground space. Conventionally, the formation of such pits for underground parking facilities and the like is performed, for example, by forming a formwork on the side wall and the bottom of an excavated underground space, casting concrete on site, and forming a concrete floor and a concrete peripheral wall. And drilling recesses for pump installation on site, especially for important drainage measures,
Here, a mold was separately assembled to construct a pump installation site using cast-in-place concrete.

[0003]

In this way, the method of performing all processes on site requires temporary facilities such as formwork assembled on site, a large amount of materials and equipment to be brought into the site, and the influence of weather is great. It is difficult to control the construction, and it takes a long time to construct concrete on site, and it is difficult to obtain a high quality and constant product. Maintenance also had to be dealt with on-site, requiring time and effort.

An object of the present invention is to eliminate the disadvantages of the prior art, eliminate the need for temporary facilities, and reduce the number of post-construction and waste material treatments, reduce on-site construction, and facilitate construction.
Construction period can be shortened, good quality can be obtained, materials can be easily brought into the site by truck, etc. Also, pit construction method for parking facilities etc. where it is difficult for floating to occur due to rising groundwater level after the facility Is to provide.

[0005]

In order to achieve the above object, the present invention secures an underground space having a required volume for parking and the like by excavating the ground, and a plurality of precast concrete In a construction method of a pit for a parking facility or the like in which bottom panels are placed at the bottom of an underground space surrounded by the panels, the panel made of precast concrete has an inner portion provided with a vertical surface, The outer part is formed in a tapered shape that spreads outward as it goes downward, and the bottom part is formed with a tapered overhang that slopes downward with the top face toward the tip, and the inside is joined with the bottom plate concrete The gist of the present invention is to form a side inverted T-shape having a projection.

Second, the upper surface of the joining projection is formed in a horizontal plane, and a slight step is provided at the center of the vertical surface at the tip, and the height of the joining projection and the tapered shape of the overhanging portion are the highest. The gist of the invention is that the height is almost equal to the height at the high position.

[0007] Third, the gist of the present invention is to make the reinforcing bars in the panel protrude from the tips of the joint protruding portions protruding to the bottom as joint reinforcing bars to be inserted into the bottom plate concrete, and to integrate them by concrete casting. is there.

According to the first aspect of the present invention, since precast concrete panels manufactured in a factory can be arranged side by side on the peripheral wall of the underground space, construction on site can be reduced. And since this panel constitutes the peripheral wall, it is not large, for example, 3.3 × 2 × 0.9
It is a substantially flat plate having a size of about m, and can be easily carried into the site by truck or the like.

The juxtaposition of the precast concrete panels in this way serves as an earth retaining structure, and the floor of the pit is constructed by casting bottom plate concrete on site. Prior to this, the panel built on the peripheral wall portion functions as a formwork, so that there is no need to separately prepare a formwork, and the work can be easily performed. In addition, even when concrete is cast on site, it can be easily performed because it is only a flat portion because it is a floor portion.

[0010] In addition, since the panel has an overhanging portion on the outside of the bottom, the overhanging portion is pressed against the ground, so that the ground has a high water level, the groundwater level rises during heavy rain, or the liquefaction of the ground. Floating at the time can be prevented. In addition, since the joining protrusion is provided on the inner side, integration with the bottom plate concrete cast on the floor can be achieved by the joining protrusion.
And since the whole shape becomes a side inverted T shape, it is stable at the time of installation, and construction becomes easy.

According to the third aspect of the present invention, in addition to the above-described operation, a reinforcing bar arranged in advance in the panel is projected as a joint reinforcing bar from the tip of the joining protrusion protruding to the bottom. The part is inserted into the bottom plate concrete, and can be integrated with the bottom plate concrete cast at the site, and the strength is reliable.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view showing an embodiment of a method for constructing a pit for a parking facility or the like of the present invention, FIG. 2 is a vertical front view of the same, and FIG. 3 is a vertical side view of the same. According to the construction method, when a pit 1 which is an underground space for parking is constructed in a mechanical parking lot constructed underground, for example, the ground is excavated to secure an underground space having a required volume. In the example shown, the underground space is approximately 25
It was a rectangular parallelepiped with a size of 00 mm, width of about 15000 mm, and height of about 7000 mm.

A plurality of precast concrete panels 2 are suspended by a crane or the like on the peripheral wall of the underground space formed by the excavation and are juxtaposed. In the illustrated example, five panels 2 are erected in the longitudinal direction of the underground space and two in the lateral direction.

The basic shape of the panel 2 is such that a protruding portion 3 for preventing floating is provided outside the bottom of the flat main body 2a.
And the inside is formed with a joint protruding portion 4 with the bottom plate concrete, and the shape thereof is described in detail with reference to FIGS. The main body 2a is formed in a tapered shape in which the inner portion is formed as a vertical surface and the outer surface is spread outward as the outer surface is lowered, and the protruding portion 3 is formed in a tapered shape in which the upper surface is inclined downward toward the top. Further, since the panel 2 was located at the corner of the pit 1, one end was formed obliquely when viewed from a plane as shown in FIG.

A joining projection 4 projecting inward from the bottom of the main body 2a.
The upper surface is formed in a horizontal plane, and a slight step portion 4a is provided at the center position of the vertical surface at the tip. The height of the joining projection 4 and the highest position of the overhanging portion 3 in the taper shape It is formed almost equal to the height.

The overall size of the panel 2 is, for example, as shown in the drawing, the overall height is 2350 mm, and the bottom width is 900 m.
m, height of main body 2a 2050mm, width of upper end of main body 2a 120m
m, width of base of body 2a 200mm, overhang length of overhang 3 350m
m, the height of the overhang base was 350 mm, the height of the overhang tip was 150 mm, the projection length of the joint protrusion 4 was 330 mm, and the height of the joint protrusion 4 was 300 mm.

A waterproof rubber 5 is attached to the joint end of the panel 2 from the main body 2a to the joint protrusion 4 in the center in the longitudinal direction in the shape of an L-shaped band.

Further, a reinforcing bar 6 is arranged inside the main body 2a, the overhanging portion 3, and the joining protrusion 4 of the panel 2 in a horizontal and vertical direction, and the end of the reinforcing bar 6 arranged horizontally inside the joining protrusion 4. From the vertical surface at the end of the joining projection 4 to form a joint reinforcing bar 6a.

The panel 2 shown in FIGS. 8 to 10 is located on the right side of the above-mentioned panel 2 which is located, for example, on the upper left side in the plan view of FIG. Since the panels 2 are continuous in the same direction, they are formed in a rectangular shape when viewed from a plane. The configuration of the panel 2 is the same as that of the panel 2 shown in FIGS.

FIG. 4 shows a pump pit 7 formed at the bottom of the pit 1 for drainage, and is made of a square precast concrete.

Further, as shown in FIG. 11, at the end of the panel 2, there are provided tie-down fittings 8 for joining with the adjacent panel 2, for example, at two positions in the vertical position. The fastening member 8 is formed in a U-shape, is disposed in a concave portion 9 formed at an end of the panel 2, and a bolt 10 and a nut 11 for connection are attached.

Further, a plurality of fence mounting holes 12 are provided at an upper end of the main body 2a of the panel 2 at appropriate intervals.

Next, a method of constructing the pit 1 using the panel 2 will be described. Excavating underground space in a plane square,
After laying a foundation crushed stone 13 on the bottom of the underground space, laying a foundation concrete 14 thereon, further laying a mortar 15 thereon and constructing a foundation, using a transportation means such as a truck here. To bring in a plurality of panels 2 produced by the factory.

Then, the panel 2 is continuously built vertically along the side wall of the underground space. At this time, the side of the overhanging portion 3 is positioned outside, and the panel 2 of a type in which the corners are formed obliquely when viewed from the planes shown in FIGS. 5 to 7 is arranged at the corners of the underground space. In this way, the shape of the panel 2 is selected so as to match the arrangement position, and a plurality of panels 2 are selected.
And surround the side wall of the underground space in a square shape.

Panel 2 with its ends butt-connected
As shown in FIG. 11, the fasteners 8 are abutted against each other, so that the fasteners 8, 8 of the adjacent panels 2 are connected with the bolts 10 and the nuts 11, and the recess 9 in which the fasteners 8 are disposed. Is filled with mortar 16.

In this state, the joining surface of the adjacent panel 2 is
As shown in FIG. 12, a water-stopping rubber 5 is interposed, and a sealing material 17 such as a urethane seal is provided at a portion facing the inside of the pit 1 at the joint to stop water at the joint.

As shown in FIG. 4, a pump pit 7 is buried at the bottom at a height slightly protruding from the upper end of the laid mortar 15. In the figure, reference numeral 20 denotes a drainage pump provided in the pump pit 7. In this case, the foundation crushed stone 13, the foundation concrete 14, the mortar spread below the pump pit 7
Fifteen layers are provided in advance.

As described above, the plurality of panels 2 are continuously arranged side by side, and the adjacent ones are connected to each other to surround the side wall of the pit 1. Since the joint reinforcing bar 6a of the reinforcing bar 6 arranged inside the panel 2 projects horizontally, as shown in FIG.
A bottom plate reinforcing bar 18 is arranged vertically and horizontally on the bottom concrete 14 at the bottom of the steel bar, and the bottom plate reinforcing bar 18 is connected to the joint reinforcing bar 6a of the reinforcing bar 6.
Combine with

Then, the finishing concrete 19 is cast on the foundation concrete 14. This finishing concrete 19
Is driven to a height that covers the upper portion of the joining protrusion 4 of the panel 2. In this case, the panel 2 is made of the finished concrete 19
Since it functions as a formwork for placing concrete, it is not necessary to separately prepare a formwork for placing the finished concrete 19.

Thus, the panel 2 and the finished concrete 19 at the bottom are integrated. A pit 1 is constructed in which the peripheral wall is composed of panels 2 and the bottom is formed of cast-in-place finish concrete 19.

Then, a fence or fence is attached to the fence attachment hole 12 provided on the upper part of the panel 2 as necessary to secure safety.

The present invention is not limited to a pit in a parking lot, but may be used for other purposes as long as the pit is an underground space whose upper surface is open and four sides are surrounded by side walls. Applicable.

[0033]

As described above, the construction method of a pit for a parking facility or the like according to the present invention can firstly be constructed by juxtaposing a precast concrete panel produced in a factory on the peripheral wall of an underground space. Therefore, the on-site construction can be reduced. And since this panel constitutes the peripheral wall,
It is not large, but is, for example, a substantially flat plate having a size of about 3.3 × 2 × 0.9 m, and can be easily brought into the site by truck or the like.

The floor of the pit is constructed by casting concrete at the site of the bottom plate. However, since the panel built on the peripheral wall in advance functions as a mold, a separate mold is prepared. There is no need to do it, and it can be easily constructed. In addition, even when concrete is cast on site, it can be easily performed because it is only a flat portion because it is a floor portion.

Further, since the panel is provided with an overhang on the outside of the bottom, the overhang is pressed against the ground, so that the ground has a high water level, the groundwater level rises during heavy rain, and the ground rises during liquefaction. Can be prevented. In addition, since the joining protrusion is provided on the inner side, integration with the bottom plate concrete cast on the floor can be achieved by the joining protrusion. And
Because the overall shape is an inverted T-shaped side surface, it is stable when installed,
Construction becomes easy.

Then, a reinforcing bar prearranged in the panel is
Since the joint rebar protrudes from the bottom of the joint to form a joint rebar, this joint rebar is inserted into the bottom plate concrete, and can be integrated with the bottom plate concrete cast at the site. It is something that can be done.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a method for constructing a pit for a parking facility or the like according to the present invention.

FIG. 2 is a longitudinal sectional front view showing an embodiment of a method for constructing a pit for a parking facility or the like according to the present invention.

FIG. 3 is a longitudinal sectional side view showing an embodiment of a method for constructing a pit for a parking facility or the like according to the present invention.

FIG. 4 is a vertical end front view of a pump pit portion showing an embodiment of a method of constructing a pit for a parking facility or the like according to the present invention.

FIG. 5 is a plan view of a panel used in a method of constructing a pit for a parking facility or the like according to the present invention.

FIG. 6 is a front view of a panel used in a pit construction method for a parking facility or the like according to the present invention.

FIG. 7 is a side view of a panel used in a pit construction method for a parking facility or the like according to the present invention.

FIG. 8 is a plan view of another type of panel used in the method of constructing a pit for a parking facility or the like according to the present invention.

FIG. 9 is a front view of another type of panel used in the method of constructing a pit for a parking facility or the like according to the present invention.

FIG. 10 is a side view of another type of panel used in the method of constructing a pit for a parking facility or the like according to the present invention.

FIG. 11 is a front view of a joint showing an embodiment of a method of constructing a pit for a parking facility or the like according to the present invention.

FIG. 12 is a cross-sectional plan view of a joint showing an embodiment of a method for constructing a pit for a parking facility or the like according to the present invention.

FIG. 13 is a plan view of a pit for parking facilities or the like according to an embodiment of the present invention, in a state where reinforcing bars are arranged.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Pit 2 ... Panel 2a ... Main body 3 ... Overhang part 4 ... Joining protrusion 5 ... Waterproof rubber 4a ... Step part 6 ... Reinforcing bar 6a ... Joint reinforcing bar 7 ... Pump pit 8 ... Tightening fitting 9 ... Recess 10 ... Bolt 11 ... Nuts 12 ... Holes for mounting fences 13 ... Foundation crushed stones 14 ... Foundation concrete 15 ... Laying mortar 16 ... Mortar 17 ... Sealing material 18 ... Bottom plate steel bar 19 ... Finishing concrete 20 ... Drainage pump

──────────────────────────────────────────────────の Continued on the front page (72) Inventor Mikio Kobayashi 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Toshiyuki Yoshimatsu 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Minoru Kobayashi 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Naoki Nishizawa 2-2-1-15 Kabukicho, Shinjuku-ku, Tokyo Within Concrete Industries Co., Ltd. 201 (72) Inventor Hiroshi Kawanishi 454-21 Kojima Yanagidacho, Kurashiki City, Okayama Prefecture (56) References JP-A-9-60010 (JP, A) JP-A-10-18315 (JP, A) Hei 10-252083 (JP, A) Actual opening Hei 58-129946 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) E04H 6/06 E02D 29/00

Claims (3)

(57) [Claims] 1. An underground space having a required volume for parking and the like is secured by excavating the ground, and a plurality of precast concrete panels are juxtaposed on a peripheral wall portion of the underground space, and an underground surrounded by the panels is provided. In the construction method of a pit for a parking facility or the like in which a bottom plate concrete is cast at the bottom of the space, the panel made of precast concrete has an inside portion on a vertical surface,
The outer part is formed in a tapered shape that spreads outward as it goes downward, and the bottom part is formed with a tapered overhang that slopes downward with the top face toward the tip, and the inside is joined with the bottom plate concrete A method of constructing a pit for a parking facility or the like, characterized in that the pit has a side-reverse T-shape having a protrusion. 2. The joining projection has an upper surface formed in a horizontal plane, a slight step provided in the center of a vertical surface at the tip, and the height of the joining projection and the highest tapered position of the overhanging portion. The pit construction method for a parking facility or the like according to claim 1, wherein the pit is formed so as to have a height substantially equal to the height of the pit. 3. The method for constructing a pit for a parking facility or the like according to claim 1, wherein the reinforcing bar in the panel is projected from a tip of a joining projection projecting to the bottom as a joint reinforcing bar inserted into the bottom plate concrete.