JP2003082993A - Outer form for bamboo split type pit gate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an outer form for a bamboo split type pit gate allowing quick assembling at a job site. SOLUTION: This outer form 1 is formed by connecting a plurality of outer form small units 1A to 1D dividedly constituted in the heading direction in response to a shape of the bamboo split type pit gate. The respective outer form small units 1A to 1D are constituted of connecting timbering 101 divided into a side part 1s and a top part 1t in an arch shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a formwork used for constructing a bamboo split type gate for a tunnel.

[0002]

2. Description of the Related Art A bamboo split type tunnel gate as shown in FIG. 22 has an advantage that a driver's visibility is improved by reflection of light when a vehicle enters a tunnel, as compared with a vertical tunnel gate. Therefore, it is safe and also helps alleviate traffic congestion because the driver does not suddenly slow down.
For this reason, the Takewari type gate is becoming the mainstream for road tunnel gate construction. In order to construct such a bamboo split type gate, first, base concrete is placed on the road surface side and cured. Next, place a ready-made inner formwork called "Centre" and assemble the reinforcing bars around it. Subsequently, the outer formwork is assembled, and a frame called the gable formwork on the end face of the tunnel is installed to complete the formwork. Then, concrete is poured between the inner mold and the outer mold, and after curing for a predetermined period, all the molds are removed.

[0003]

In the above construction process, it takes the longest time to assemble the outer formwork. This is because a large number of steel materials and the like that form the outer form must be assembled and adjusted on site. In addition, when removing the outer mold, it is necessary to dismantle even a large number of components, and thus it takes a similar time. Therefore, it takes a long time (about 40 days) to complete the construction of the gate, and the construction cost is high (about 12 million yen). In view of the above-mentioned conventional problems, an object of the present invention is to provide an outer mold for a bamboo split type gate that can be quickly assembled on site.

[0004]

An outer formwork for a bamboo split type gate according to the present invention comprises a plurality of outer formwork small units divided in the direction of a gallery corresponding to the form of the bamboo split type gate. The outer formwork small unit is formed by connecting in the direction of a tunnel, and the supporting structure divided into a side portion and a top portion corresponding to the gate is connected in an arch shape (claim 1). In the bamboo split type outer mold for a gate constructed as described above, a plurality of outer mold small units configured by connecting the side portion and the top portion in an arch shape are connected to each other in the tunnel direction. The outer formwork. Therefore, the outer formwork is assembled by assembling the side part and the top part of the outer formwork small unit as constituent elements.

Further, in the outer frame for the bamboo split type gate (claim 1), the metal fitting for holding the gable form for forming the end face of the bamboo split type gate is a support for the outer frame small unit. It may be attached to (claim 2). In this case, the gable formwork is held down by the metal fittings attached to the support work.

Further, in the above-mentioned bamboo split type outer mold for a gate (claim 1), another outer mold small unit having only a side support corresponding to the vicinity of the entrance of the gate is the outer mold. It may be connected to a small unit (claim 3). In this case, the top of the outer formwork is omitted according to the form of the bamboo split type gate where the end face of the gate becomes lower toward the entrance of the pit, and the number of unnecessary structural parts is reduced accordingly.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a front view of a tunnel showing a state in which concrete for a tunnel is placed in an outer form for a bamboo split type tunnel in a first embodiment of the present invention. It is the figure seen. However, the inner formwork (centre) has a known structure and is not a main part of the present invention, so that the illustration is omitted (the same applies hereinafter). In FIG. 1, the outer formwork 1
Is the side 1 against the gate (concrete to be cast) 2
s and the top part 1t are connected in an arch shape. The concrete forming the tunnel 2 is joined to the invert (concrete) 3 buried under the road surface R to form a horseshoe-shaped structure.

2 and 3 are a side view and a plan view of the outer formwork 1, respectively. The outer formwork 1 is composed of a plurality of (four in this example) outer formwork small units 1A, which are divided and configured in the direction of the tunnel of the Takewari type gate (left and right direction in FIG. 2, up and down direction in FIG. 3).
1B, 1C and 1D are connected in the direction of the gallery. Each of the outer formwork small units 1A to 1D is a vertical and horizontal assembly of a supporting member 101 having an arch shape as a whole and a linear through beam 102 arranged horizontally, which are made of H-shaped steel. Become. The lower end of the supporting structure 101 can be fixed to the invert 3 (FIG. 1) by an anchor bolt (not shown).
Further, a stopper 103 is attached to the lowest through beam 102, and this and the invert 3 can be fixed to each other via a so-called separator (not shown). Outer formwork small unit 1A ~
On the inner surface side of 1D, a steel plate 1 corresponding to the form of a bamboo split type gate.
04 is attached. A frame 105 for adjustment is attached to the tunnel-side end of the outer mold 1 as needed.

FIG. 4A shows the outer mold small unit 1 described above.
A side view of the side portions 1s (one side) of A to 1D, showing a state in which a support beam 101 and a through beam 102 are assembled,
(B) is the front view. There are a pair of left and right sides 1s. On the other hand, (a) of FIG. 5 is a front view showing a state in which the supporting structure 101 and the through beam 102 are assembled at the top part 1t of the outer mold small units 1A to 1D, (b).
Is a plan view thereof. Each of the outer formwork small units 1A to 1D has a supporting structure 101 divided into a side part 1s and a top part 1t.
Is connected in an arch shape.

FIG. 6 is a development view of the original shape of the steel plate 104. The steel plate 104 is bent so as to have the form shown in FIG. 7, and is cut at the dotted line shown in FIG. 6, and the pair of first steel plates 104as are respectively left and right side portions in the outer mold small unit 1A. It is attached to the inner surface of 1s. The second steel plate 104at is the outer mold small unit 1
It is attached to the inner surface of the top portion 1t of A. The pair of third steel plates 104b are attached to the inner surfaces of the left and right side portions 1s of the outer mold small unit 1B, respectively. A pair of 4th
The steel plates 104c are attached to the inner surfaces of the left and right side portions 1s of the outer mold small unit 1C, respectively. Then, the pair of fourth steel plates 104d are attached to the inner surfaces of both the left and right side portions 1s of the outer mold small unit 1D.

In this way, the outer formwork small units 1A to
In each steel plate attached to 1D, the side portions 1s are connected between the small units, respectively, and the side portions 1s and the top portion 1t are connected in each small unit. A steel plate 104 having a concrete forming surface corresponding to the shape of the mold gate is formed on the inner surface side of the outer mold 1. That is, the outer formwork small units 1A to 1D to which the respective parts of the steel plate 104 are attached are divided and configured in the tunnel direction corresponding to the form of the bamboo split type gate.

FIG. 8 is a perspective view showing the entire shape of the gable form 4 used for forming the end face (so-called bamboo cut end) of the bamboo split type gate. The gable formwork 4 is a steel plate 104 as shown.
It is attached so as to abut the bamboo split end face. The gable formwork 4 is, for example, a wooden formwork to which a large number of reinforcing splints are attached.

Next, a procedure for assembling the outer formwork 1 and the gable formwork 4 whose main parts are configured as described above at the site of the tunnel construction will be described. In addition, the outer formwork small unit 1
The side part 1s of A to 1D and the top part 1t are manufactured in a factory. Also, it is assumed that the invert and base concrete have already been completed at the site, and the inner formwork and reinforcing bars have been placed. FIG. 9 is a side view of the vicinity of the entrance of the tunnel. First, the side part 1s of the outer mold small unit 1A is installed on the end 5 of the lining concrete of the tunnel through the adjusting mold 105, if necessary, using the crane vehicle 6. After installation, the outer frame small unit 1A is fixed to the invert 3 (FIG. 1) using anchor bolts and separators. Then, similarly, the outer formwork small unit 1B
Are installed and fixed, and both units 1A and 1B are connected to each other (fastened with bolts or the like). In this manner, the side portions 1s of the outer mold small units 1A to 1D are sequentially installed and fixed, and are connected to each other.

Subsequently, as shown in FIG. 10, the tops 1t of the outer mold small units 1A to 1D are sequentially installed by using a crane vehicle 6. After the installation, each top 1t is fixed to each side 1s, and each top 1t is connected to each other. In this way, the outer formwork 1 shown in FIG.
Reference numeral 04 constitutes a forming surface forming the outer peripheral shape of the bamboo split type gate.

Assembling the outer formwork 1 as described above is accomplished by assembling the side part 1s and the top part 1t which are preliminarily formed as the respective constituent elements of the outer formwork small units 1A to 1D at the site of the tunnel construction. Is. Therefore, the outer formwork 1 can be quickly assembled. Specifically, the outer formwork 1 can be assembled in about one-third the construction period as compared with the conventional method of assembling the outer formwork 1 from the ground up. Also, the side part 1
Since the unit configuration includes s and the top 1t as a unit, adjustment after installation is relatively easy.

Next, the gable form 4 is attached. FIG. 11 shows
It is the figure which looked at the end form 4 arrange | positioned at a predetermined position from the direction orthogonal to the frame surface. The gable form 4 is pressed by a large number of fasteners F1 to F11 attached to the supporting structure 101. In the left half (not shown), the fasteners F1 to F10 are symmetrically arranged. Further, the wooden mold 7 is vertically pressed against the lowermost portion. FIG. 12 is a side view in which the outer formwork small units 1A to 1D are flatly developed as seen from one side surface. The fasteners F1 to F11 are arranged along the end surface of the steel plate 104 as illustrated.

The fasteners F1 to F10 are made of H-shaped steel L
They are butt-shaped and welded to each other, but the angles forming the L-shape gradually increase in the order of F1 to F11.
The shapes are all different. As two examples of them, (a) of FIG. 13 shows a fastener F1 and (c) shows a fastener F3.
Is shown. The angle θ1 shown in (a) of the fastener F1 is 90 degrees, while the angle θ1 of the fastener F3 is θ as shown in (c).
3 becomes as large as 102 degrees. Also, (b) and (d)
The attachment angles α1 and α3 of the fasteners F1 and F3 with respect to the support structure 101 are slightly different from each other. By making the shapes and attachment angles different in this way, the holding portions F1a, F3a of the fasteners F1, F3 become parallel to the frame surface of the end form 4 at the respective positions shown in FIG. Is adjusted.

The stoppers F1 and F3 are used for the support 101
It is attached to the support fitting 8 (FIG. 13) welded to the. 14A is a front view of the support fitting 8, and FIG. 14B is a side view. The support metal fitting 8 includes a square pipe portion 8a through which the metal fittings F1 and F3 are inserted and two tightening bolts 8b.
Consists of. The stoppers F1 and F3 are movable in the square pipe portion 8a, and at any position, the tightening bolt 8
It can be fixed by b.

FIG. 15 is a diagram schematically showing a structure for pressing the end form 4. 16 and 17 show an AA cross section and a BB cross section in FIG. 15, respectively. Further, FIG. 18 is a view of the structure as viewed from the side. In FIGS. 15 and 16, the support fitting 8 is welded to the supporting structure 101, and, for example, the fastening fitting F1 is attached thereto. A pair of auxiliary metal fittings 9 are attached to the stopper metal fitting F1, and a screw rod 10 is attached to each of them. The screw rod 10 holds the steel pipes 12 arranged in two rows via the holding plate 11 (FIG. 16). As a result, the two rows of two pipes 12 press down the gable formwork 4. On the other hand, as shown in FIGS. 17 and 18, the short threaded rod 13 is not located immediately below the fasteners F1 to F11.
The pipe 12 and the end form 4 are configured to be in close contact with each other via the. Further, the pipes 12 are arranged in two rows and two sets in an arch shape similar to the gable form 4. In this way, the gable form 4 is pressed by the metal fittings (F1 to F11, 8) attached to the supporting structure 101 and various members (9 to 13) attached thereto. Therefore, the gable form 4 can be securely pressed.

19 and 20 are views showing a state in which a pipe 202 is added to FIGS. 1 and 3, respectively. After mounting the gable formwork 4 as described above, FIG.
9 and FIG. 20, the base concrete 201
Between the outer mold 1 and the outer form 1, a pipe 202 of variable length for support
Is mounted, and the length of the outer mold 1 is adjusted on both left and right sides to finely adjust the position of the entire outer mold 1 to the left and right.

This completes the mounting and adjustment of the formwork. After that, concrete is placed inside the outer formwork 1 and cured, and then all formwork is removed to complete the bamboo split gate. The outer mold 1 can be removed by removing the top parts 1t in the order of the outer mold small units 1D, 1C, 1B and 1A, and then removing the side part 1s, contrary to the assembling. That is, it is not necessary to dismantle even small components as in the prior art, so that quick removal is possible. In this way, the construction period required to complete the gate is significantly shortened compared to the conventional method.
Specifically, the construction period is about 20 days, and the construction cost is about 6 million yen, making it possible to construct a bamboo split type gate with half the construction period and construction cost.

FIG. 21 is a side view of an outer formwork for a bamboo split type tunnel according to the second embodiment. The difference from the first embodiment is that the outer form small units 1A, 1B, 1C, 1D are further connected with a pair of other stair-like outer form small units 1E. This outer formwork small unit 1E has a support structure 101 only on the side corresponding to the vicinity of the entrance of the tunnel, and there is no structure at the top. Moreover, the entrance side is lowered in a staircase according to the form of the bamboo split type gate. In the first place, since the end face of the bamboo split type gate becomes lower toward the mouth of the pit, in the case of an arched outer formwork, the upper side is a structural part unnecessary for concrete pouring. In this respect, the outer mold unit 1E as described above has a small number of unnecessary structural parts, and is accordingly small and lightweight. Also,
In this unit 1E, units having a similar shape to the inside are integrally arranged with a distance corresponding to the thickness of the gate, and not only the outer mold but also the inner mold can be provided. Therefore, at the tip of the bamboo split type gate, the inner and outer molds are configured only by this unit 1E, and it is not necessary to assemble the mold on site.

[0023]

The present invention constructed as described above has the following effects. According to the outer formwork for a bamboo split type tunnel of claim 1, a plurality of outer formwork small units configured by connecting the side part and the top part in an arch shape are connected to each other in the direction of the gallery and are connected to the outside. Since the mold is configured, the outer mold can be quickly assembled by assembling the side part and the top part of the outer mold small unit as constituent elements.

[0024] According to the outer frame for the bamboo-splitting type gate, according to claim 2,
Since the gable formwork is held down by the metal fittings attached to the supporting structure, the gable formwork can be held down securely.

According to the outer frame for the bamboo-splitting type gate of claim 3,
The top of the outer formwork is omitted according to the form of the bamboo split type gate where the end face of the gate is lower toward the mine mouth side, and unnecessary structure parts are reduced accordingly, so the outer formwork is relatively small as a whole It is lightweight.

[Brief description of drawings]

FIG. 1 is a front view of a tunnel showing a state in which concrete to be a tunnel is placed in an outer form for a bamboo split type tunnel in the first embodiment of the present invention.

FIG. 2 is a side view of the outer frame for the bamboo split type gate.

FIG. 3 is a plan view of the outer frame for the bamboo split type gate.

FIG. 4 (a) is a side view showing a state in which a supporting beam and a through beam are assembled on a side portion of the outer form small unit of the outer form for a bamboo split type gate, and FIG. Is a front view thereof.

FIG. 5 (a) is a front view showing a state in which a support beam and a through beam are assembled at the top of the outer frame small unit of the outer frame for the bamboo split type gate, and FIG. It is the top view.

FIG. 6 is a development view of an original shape of a steel plate in the bamboo split type outer frame for a tunnel.

FIG. 7 is a perspective view of an assembled state of the steel plates in the bamboo split type outer frame for a tunnel.

FIG. 8 is a perspective view of a gable formwork attached to the outer formwork for the bamboo split type gate.

FIG. 9 is a view showing the procedure for assembling the outer frame for the bamboo split type gate, and is a view of the vicinity of the entrance of the tunnel as seen from the side.

FIG. 10 is a diagram showing an assembling procedure of the outer frame for the bamboo split type gate, which is a view of the vicinity of the entrance of the tunnel as seen from the side surface.

FIG. 11 is a view of the gable formwork arranged at a predetermined position with respect to the outer formwork for the bamboo-split type tunnel, viewed from a direction orthogonal to the frame surface.

FIG. 12 is a side view of the outer mold small unit viewed from one side in a plan view.

FIG. 13 is a view showing a stopper of the gable formwork and a mounting state thereof.

FIG. 14 (a) is a front view of a support metal fitting for supporting a stopper of a gable formwork, and FIG. 14 (b) is a side view.

FIG. 15 is a diagram schematically showing a structure for pressing the gable form.

16 is a diagram showing an AA cross section in FIG.

17 is a diagram showing a BB cross section in FIG.

FIG. 18 is a side view of the structure for pressing the gable formwork.

FIG. 19 shows a state in which a supporting pipe is mounted between the base concrete and the outer formwork from the state shown in FIG.

FIG. 20 shows a state in which a supporting pipe is mounted between the base concrete and the outer form from the state shown in FIG.

FIG. 21 is a side view of an outer formwork for a bamboo split type gate according to the second embodiment.

FIG. 22 is a perspective view showing a bamboo split type gate of a tunnel.

[Explanation of symbols]

1 Outer formwork 1A to 1E Outer formwork small unit 1s side 1t top 2 tunnel 101 Support work 104 steel plate F1-F11 stopper

Claims (3)

[Claims] 1. A plurality of outer formwork small units divided in the direction of the gallery corresponding to the form of a bamboo split gallery are connected in the mineway direction, and the outer formwork small unit is a gallery. An outer form for a bamboo split type gate, characterized in that the supporting work divided into a side part and a top part corresponding to is connected in an arch shape. 2. A bamboo split type gate for a bamboo split type gate according to claim 1, wherein a metal fitting for holding a gable form for forming an end face of the bamboo split type gate is attached to a support of the outer mold small unit. Outer formwork. 3. The outside of the bamboo-split type tunnel gate according to claim 1, wherein another outer formwork small unit having only a side support corresponding to the vicinity of the wellhole entrance is connected to the outer formwork small unit. Formwork.