JP2848484B2 - Temporary retaining concrete formwork device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temporary soil retaining apparatus for a shaft, and more particularly to a cast-in-place temporary soil retaining concrete formwork apparatus.

[0002]

2. Description of the Related Art Conventionally, shafts for deep foundations and the like are formed by excavating a circular hole vertically, and a segment-shaped steel liner plate, which is carried from the ground to the tip of the face as the excavation proceeds, is sequentially performed manually. A method of assembling into a cylindrical shape and temporarily retaining the ground is common.

There is also known an apparatus for suspending a gondola and a concrete spraying machine, which is carried by an operator, as a part of automation of a shaft excavation work, and spraying concrete on an inner wall surface of the shaft to temporarily suspend soil.

[0004]

The work of installing a liner plate by hand is a troublesome operation in a bad environment, which imposes a heavy burden on a worker and has a problem in work efficiency. In addition, there is a fear that a fall accident may occur when a worker enters a mine, or an accident may occur due to a drop of construction materials or the like during the work, so that unmanned work in the mine is desired.

On the other hand, a system in which a worker is attached to a gondola and suspended in a hole, and concrete is directly sprayed on the face face does not require labor and time for installing a liner plate, and is relatively safe for the worker. However, since about 20 to 30% of the sprayed concrete falls from the face, the concrete is wasted and uneconomical.

Therefore, there is a technical problem to be solved in order to achieve unmanned temporary earth retaining work for the shaft and to improve the use efficiency of the material, and the present invention aims to solve the above problem. And

[0007]

SUMMARY OF THE INVENTION The present invention proposes to achieve the above object. A plurality of jacks are radially arranged in a horizontal direction and connected by a frame, and the plurality of jacks are connected. Frames are arranged in three layers and integrally connected by a vertical frame. A connection portion of a crane wire is provided at the upper part of the three-layer frame, and a push plate is attached to each of upper jacks to form a gripper device. Each of the intermediate layer jacks is fitted with a segmented shaft formwork to form a formwork expansion and contraction device, and a segmented passive formwork is connected between the formwork mounted on the jack by a link to be freely expandable and contractable. The passive mold is configured as a shaft with a circular cross section that can be exchanged freely, and hinge push plates arranged in segments on the outer periphery of the lower frame are pivotally moved up and down, respectively. The hinge push plate is pivotally attached to the frame, and the jack is interposed between the frame and the hinge push plate to allow the hinge push plate to expand and contract. The hinge push plates arranged in an annular shape are formed of an elastic resin material such as rubber. The end plate having a hollow truncated conical shape and a diameter larger than the outer diameter of the hinge push plate is placed to form a stop plate opening / closing device, and the inner wall surface of the end plate is pressed by the hinge push plate to push the end plate. It is an object of the present invention to provide a temporary retaining concrete formwork device capable of being pressed against a lower end surface of a formwork and a shaft wall of a shaft.

[0008]

The temporary soil retaining concrete formwork apparatus is suspended by the excavator in the shaft being excavated, and the upper part of the formwork is positioned near the lower end of the existing temporary retaining earth. Driving the upper gripper device provided on the temporary soil retaining concrete formwork device to fix the entire temporary soil retaining concrete formwork device, expanding the formwork to the specified size by the form expansion / contraction device, and driving the end plate opening / closing device An annular end plate integrally formed of an elastic material such as rubber is pressed against the lower end surface of the mold frame and the pit wall. After that, concrete is filled between the formwork and the pit wall, so that the pit wall is temporarily retained.

Since the molds are radially divided and formed so that the divided segment molds can be separated from each other, various molds can be obtained by replacing some molds with molds having different arc lengths. Can be used.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIGS. 1 and 2 show a shaft excavator 1, and as shown in FIG. 1, a traveling vehicle 4 is engaged with a lateral rail 3 of a portal frame 2 installed on the ground, and is arranged radially on the traveling vehicle 4. The temporary earth retaining concrete formwork device 6 shown in FIG. 2 is suspended by three cranes 5, 5, 5. Further, the lifting wire 8 of the traveling crane 7 disposed at the center of the cranes 5, 5, 5 shown in FIG. 1 passes through the central space 9 of the temporary retaining concrete formwork device 6 as shown in FIG. The lifting wire 8 hangs downward and the vertical cross-section
Is supported. Therefore, the excavator 10 and the temporary earth retaining concrete formwork device 6 can be individually lifted and lowered.

Soil such as earth and sand excavated by the excavator 10 is sucked to the ground through an earth discharging pipe 11 and discharged by an earth discharging device 12. On the excavated pit 13, a temporary retaining concrete formwork device 6 is set, and concrete is poured into a gap between the formwork 14 and the pit 13, and excavation and temporary earth retaining of the pit 13 are sequentially performed from above. Proceeding in parallel, a shaft is formed.

FIGS. 3 to 6 show a temporary retaining concrete formwork device 6, which comprises an upper gripper device 15, an intermediate form expanding / contracting device 16, and a lower end plate opening / closing device 17. It is composed of

The gripper device 15, the form enlarging / reducing device 16 and the end plate opening / closing device 17 are all connected with radially arranged hydraulic jacks 18, 19, 20 by tube frames 21, 21,... The form expanding / contracting device 16 moves the hydraulic jacks 18, 18,
18, 19, 19, 19 are arranged, and the bobbin opening / closing device 17 is provided with hydraulic jacks 20, 20,. The gripper device 15, the form enlarging / reducing device 16, and the end plate opening / closing device 17, which are arranged in three layers vertically, include a vertical frame 22,
.. Are connected.

As shown in FIGS. 3 and 4, the gripper device 15 includes a guide rod 2 loosely fitted on a slide guide 23.
4, a holding plate 25 is attached to the tip of the guide rod 24.
The piston rod of the hydraulic jack 18 is connected to the hydraulic jack 18.

The hydraulic jack 19 of the form expanding / contracting device 16 includes:
Like the gripper device 15, the guide rods 27 are loosely fitted to the slide guides 26, and are respectively connected to the guide rods 2.
7, 27, 27, a segment-shaped main formwork 2
8, 28, 28 are mounted. Then, the driving formwork 28, 28, which is mounted on the hydraulic jack 19, 19, 19,
28 is a passive formwork 29, 2 which can be exchanged as shown in FIG.
9 and 29 are connected via links 30, 30,..., And the left and right end faces of the driving formwork 28 are formed in a wedge shape.
Both end faces of the passive formwork 29, 29, 29 are inclined surfaces that match the end faces of the driven formwork 28. Accordingly, when the hydraulic jacks 19, 19, 19 of the form expanding / contracting device 16 are extended, the driven form 28 and the end face of the passive form 29 coincide with each other, and the passive forms 29, 29 on both sides of the driven form 28 are wedge-action. And expanded to a predetermined outer diameter.

As shown in FIG. 4, pin holes 31, 31 are formed near the left and right ends of the passive formwork 29.
Formwork lock jack 3 in which the driven formwork 28 and the passive formwork 29 are expanded to the design dimensions and provided on the left, right, top and bottom of the driven formwork 28.
Formwork lock jack 3 by extending 2, 32
The pin 33 pivotally attached to the second piston rod is
And the driven formwork 28 and the passive formwork 29 are fixed to each other.

On the other hand, when the diameter is reduced, the passive formwork 29, 29, 2
9 is the main formwork 28, 2 by removing the link 30.
It is detachable with respect to 8, 28, and can be used for shafts with various inner diameters by replacing it with a passive mold having a different arc length. Then, depending on the curvature and the arc length of the passive form, the cross section of the form 14 to be circular may not be a perfect circle and may be distorted. The inner diameter does not need to be a perfect circle and does not hinder construction.

As shown in FIGS. 3 and 6, each of the frame of the end plate opening / closing device 17 and the hydraulic jacks 20, 20,... Are provided with hinge push plates 34, 34,.
, A hollow truncated conical rubber end plate 35 is mounted on the upper surfaces of the hinge push plates 34, 34,... The outer diameter of the end plate 35 is formed to be smaller than the inner diameter of the face of the shaft, and when the hydraulic jacks 20, 20,.
The lower surface of the end plate 35 is pressed in the radially expanding direction by 4, 34,.
3 to prevent concrete from flowing out.

At the time of temporary soil retaining work, the temporary soil retaining concrete formwork device 6 is suspended and the gripper device 15 is driven so that the upper portion of the formwork 14 is located near the lower end of the existing temporary soil retaining portion 36 as shown in FIG. Then, the pressing plates 25, 25, 25 are pressed against the inner peripheral surface of the existing temporary earth retaining member 36 to fix the temporary earth retaining concrete form device 6.

Subsequently, the hydraulic jacks 19, 19, 19 of the form enlarging / reducing device 16 are driven to expand the form 14 to a predetermined outer diameter, and the form lock jacks 32, 3 described above.
2, the driven molds 28, 28, 28 and the passive molds 29, 29, 29 are fixed to be kept in a circular state. Then, the end plate opening / closing device 17 is driven to move the end plate 35 to the form 14.
Is pressed into contact with the lower end surface of the pit and the pit wall 13 to shield the space formed by the formwork 14 and the pit wall 13.

In this way, after setting the temporary retaining concrete formwork device 6 at a predetermined position, the passive formwork 2 is connected to a concrete pump (not shown) on the ground via a hose.
Concrete is filled between the formwork 14 and the pit wall 13 from the concrete pouring holes 37, 37,.

After the concrete has hardened and the temporary soil has been completed, the mold 14 is removed and moved by reversing the above procedure, and the temporary soil is continuously lowered while being lowered sequentially in parallel with the excavation work.

The present invention is not limited to the above-described embodiment. For example, the number of hydraulic jacks of the gripper device 15, the mold expanding / contracting device 16, the end plate opening / closing device 17, and the form 1
The number of divisions of 4, etc., can be variously modified within the technical scope of the present invention, and it goes without saying that the present invention extends to those modified ones.

[0024]

Since the present invention is constructed as described in detail in the above embodiment, a series of operations of installing a concrete form in a shaft, placing temporary concrete, and removing the form are unmanned. It can contribute to labor saving and improvement of safety. In addition, since the outer diameter of the formwork can be easily changed, and it has versatility to cope with various construction specifications, there is no waste of investment cost, which is effective in shortening the construction period and saving labor. .

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, and is a longitudinal sectional view of an upper part of a shaft excavation apparatus.

FIG. 2 is a vertical end view of a lower part of the shaft excavation apparatus.

FIG. 3 is a longitudinal sectional end view of a temporary retaining concrete formwork apparatus.

FIG. 4 is a view showing the gripper device, which is taken along line AA of FIG. 3;

FIG. 5 is a view showing the form enlarging / reducing device, as viewed from the direction of arrows BB in FIG. 3;

FIG. 6 is a view showing the end plate opening / closing device, as viewed from the direction of arrows CC in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vertical shaft excavation apparatus 4 Traveling trolley 5 Crane 6 Temporary retaining concrete formwork apparatus 13 Downhole wall 14 Formwork 15 Gripper apparatus 16 Formwork expansion / contraction apparatus 17 Shock opening / closing apparatus 18,19,20 Hydraulic jack 21 Tube frame 22 Vertical frame 28 Main type Frame 29 Passive formwork 30 Link 31 Pin hole 32 Formwork lock jack 33 Pin 34 Hinge push plate 35 Wife plate 36 Existing temporary soil retaining 37 Concrete pouring hole

Continued on the front page (73) Patent holder 000207780 Taitoyo Construction Co., Ltd. 1-424 Shinkawa, Chuo-ku, Tokyo (73) Patent holder 391035795 Shiraishi 3-4-1 Marunouchi, Chiyoda-ku, Tokyo (72) Inventor Akira Matsuyama 2-34-2 Yokota, Atsuta-ku, Nagoya-shi, Aichi Chubu Electric Power Co., Inc. Chuo Transmission and Substation Construction Plant (72) Inventor Hirokazu Inagaki 2-1, Tsukudo-cho, Shinjuku-ku, Tokyo Kumagaya Gumi Co., Ltd. Tokyo Head Office (56) References JP-A-8-158778 (JP, A) JP-A-8-158779 (JP, A) JP-A-7-102874 (JP, A) (58) Fields surveyed (Int. Cl. ⁶ , DB name) E21D 1/08 E21D 5/01

Claims (1)

(57) [Claims] 1. A plurality of jacks are radially arranged in a horizontal direction and connected by a frame, and a frame in which the plurality of jacks are connected is arranged in three layers and integrally connected by a vertical frame. A crane wire connection is provided on the upper part of the frame, and a push plate is attached to each of the upper jacks to form a gripper device, and a segmented vertical shaft form is attached to the intermediate layer jacks, respectively. Forming an expansion / contraction device, linking a segment-shaped passive form between the forms mounted on the jack by a link to be able to expand and contract, and to configure a shaft shaft form having a circular cross section capable of exchanging the passive form,
On the lower layer frame, hinge push plates arranged in the form of segments on the outer peripheral portion of the frame are pivotally connected to each other so as to be vertically rotatable, and the jack is interposed between the frame and the hinge push plate. The hinge push plate is made freely expandable and contractable, and a hollow frustoconical shape formed of an elastic resin material such as rubber and having a diameter larger than the outer diameter of the hinge push plate is placed on the hinge push plate arranged in an annular shape. A temporary earth retaining concrete formwork device in which a stop plate opening / closing device is formed, and the inner wall surface of the stop plate is pressed by the hinge pressing plate so that the stop plate can be pressed against the lower end surface of the formwork and the pit wall surface of the shaft. .