JPH08326468A - Temporary earth retaining concrete form device - Google Patents

Abstract

PURPOSE: To execute unmanned temporary earth retaining work in a shaft excavation work. CONSTITUTION: A temporary earth retaining concrete form device 6 comprises a gripper device 15 and a form expanding device 16 and a side board opening and closing device 17 which are integrated into three layers. The temporary earth retaining concrete form device is suspended at an upper position of a shaft excavator and fixed with the lower end area of an existing temporary earth retaining 36 with the gripper device 15. A form 14 is expanded with the form expanding device 16 so as to provide a specified outside diameter. After a rubber-made side board 35 is pressed against the lower end face of the form 14 by means of the side board opening and closing device 16, concrete is filled up between the form 14 and the wall of a pit 13 from a concrete placement opening 13. The form 14 comprises an active form 28 connected by a hydraulic jack 19 and a passive form 29 which connects the main positive form 28. It is possible to comply with shafts having various kinds of holes by replacing the passive form 29 with that having a different arc length.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temporary earth retaining device for a vertical shaft, and more particularly to an in-situ temporary earth retaining concrete formwork device.

[0002]

2. Description of the Related Art Conventionally, a vertical shaft such as a deep foundation has been drilled vertically in a circular hole, and a segment-shaped steel liner plate that is carried from the ground to the tip of the face as the drilling progresses is manually performed. Generally, a method of assembling in a cylindrical shape and temporarily holding it is used.

Further, as a part of automation of vertical shaft excavation work, a device is also known in which a gondola and a concrete spraying machine, which an operator rides, are suspended in the mine, and concrete is sprayed on the inner wall of the mine to temporarily hold the soil.

[0004]

The work of installing the liner plate manually is a laborious work in a bad environment, the burden on the worker is heavy, and the work efficiency is difficult. Further, there is a risk of a crash accident when a worker enters the mine, or an accident due to a fall of construction materials or the like during the work. Therefore, unmanned mine work is desired.

On the other hand, the one in which a gondola is carried by a worker and suspended in the hole and the concrete is directly sprayed on the face of the face does not require labor and time for installing the liner plate, and is relatively safe for the worker. However, about 20 to 30% of the shotcrete drops from the face, which wastes concrete and is uneconomical.

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

[0007]

DISCLOSURE OF THE INVENTION The present invention is proposed in order to achieve the above object, and a plurality of jacks are arranged radially in a horizontal direction and connected by a frame, and the plurality of jacks are connected. The frames are arranged in three layers and are integrally connected by a vertical frame, and a crane wire connecting portion is provided on the upper part of the three-layer frame, and a push plate is attached to each of the upper jacks to form a gripper device. Then, each of the intermediate layer jacks is fitted with a segment-shaped shaft formwork to form a formwork expansion / contraction device, and a segment-shaped passive formwork is connected by a link between the formwork mounted on the jacks to allow expansion / contraction. Further, a vertical shaft formwork having a circular cross-section which can be exchanged with the passive formwork is constructed, and a hinge push plate arranged in a segment shape on the outer peripheral portion of the lower frame is vertically rotated. The hinge push plate is pivotally attached to the frame and the hinge push plate is interposed between the frame and the hinge push plate to make the hinge push plate expandable and contractible, and the hinge push plates arranged in an annular shape are made of an elastic resin material such as rubber. A gable plate having a hollow truncated cone shape and a diameter larger than the outer diameter of the hinge pressing plate is mounted to form a grate plate opening / closing device, and an inner wall surface of the gable plate is pressed by the hinge pressing plate to form the gable plate. It is intended to provide a temporary earth retaining concrete formwork device that can be pressed against the lower end surface of the formwork and the shaft wall of the shaft.

[0008]

[Operation] The temporary earth retaining concrete formwork device is suspended in the vertical shaft being excavated by the excavator, and the upper portion of the formwork is positioned near the lower end of the existing temporary earth retaining. The upper gripper device provided on the temporary earth retaining concrete formwork device is driven to fix the entire temporary earth retaining concrete formwork device, the formwork expansion / contraction device is used to expand the formwork to the specified dimensions, and the end plate opening / closing device is also driven. A ring-shaped end plate integrally formed with an elastic material such as rubber is pressed against the lower end surface of the vertical frame and the pit wall. After that, the pit wall is temporarily retained by filling concrete between the formwork and the pit wall.

Since the molds are radially divided and formed so that the divided segment molds can be separated from each other, it is possible to change various molds by exchanging some of the molds with molds having different arc lengths. It can be used for vertical shafts with a hole diameter of.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. 1 and 2 show a shaft excavating device 1, and as shown in FIG. 1, a traveling carriage 4 is engaged with a horizontal rail 3 of a gate-shaped frame 2 installed on the ground, and is arranged radially on the traveling carriage 4. The temporary earth retaining concrete formwork device 6 shown in FIG. 2 is suspended by three cranes 5, 5, and 5. Further, the lifting wire 8 of the traveling crane 7 arranged in the center of the cranes 5, 5, 5 shown in FIG. 1 passes through the central space portion 9 of the temporary earth retaining concrete formwork device 6 as shown in FIG. It is hung downward, and this hoisting wire 8 is used to make a full-section vertical shaft excavator 10.
Is supported. Therefore, the excavator 10 and the temporary earth retaining concrete formwork device 6 can be individually moved up and down.

[0011] The shearing of the earth and sand excavated by the excavator 10 is sucked up to the ground through the soil discharge pipe 11 and discharged by the soil discharge device 12. A temporary earth retaining concrete formwork device 6 is set on the excavated mine wall 13, concrete is placed in the gap between the formwork 14 and the mine wall 13, and excavation and temporary earth retaining of the mine wall 13 are sequentially performed from above. Vertical shafts are formed in parallel.

FIGS. 3 to 6 show a temporary earth retaining concrete formwork device 6, which includes an upper gripper device 15, an intermediate formwork expanding / reducing device 16 and a lower end plate opening / closing device 17. It consists of and.

The gripper device 15, the form expansion / contraction device 16 and the end plate opening / closing device 17 are connected to the hydraulic jacks 18, 19, 20 arranged radially by tube frames 21, 21, ... The form enlargement / reduction device 16 has hydraulic jacks 18, 18,
18, 19, 19, 19 are arranged, and in the end plate opening / closing device 17, hydraulic jacks 20, 20, ... Are arranged in 6 directions. The gripper device 15, the form expansion / contraction device 16, and the end plate opening / closing device 17, which are arranged in three layers above and below, are provided in the vertical frame 22,
22 ... are connected.

The gripper device 15 has a guide rod 2 loosely fitted in a slide guide 23 as shown in FIGS.
The pressing plate 25 is attached to the tip of the guide rod 24
The piston rod of the hydraulic jack 18 is connected to the.

The hydraulic jack 19 of the form expanding / contracting device 16 is
Similar to the gripper device 15, the guide rods 27 are loosely fitted to the slide guides 26 and are connected to the guide rods 2 respectively.
Segmental driving form 2 at the tip of 7, 27, 27
8, 28, 28 are attached. Then, the driving molds 28, 28 mounted on the hydraulic jacks 19, 19, 19,
28 is a replaceable passive formwork 29, 2 as shown in FIG.
9, 29 and links via links 30, 30, ..., The left and right end surfaces of the driving form 28 are formed in a wedge shape,
Both end surfaces of the passive molds 29, 29, 29 are inclined surfaces that match the end surfaces of the driving mold 28. Therefore, when the hydraulic jacks 19, 19, 19 of the form expanding / contracting device 16 are extended, the end faces of the driving form 28 and the passive form 29 coincide with each other, and the passive forms 29, 29 on both sides of the driving form 28 act as a wedge. It is pressed by and expanded to a predetermined outer diameter.

Further, as shown in FIG. 4, pin holes 31 and 31 are opened near the left and right ends of the passive form 29,
Form lock jack 3 in which the driving form 28 and the passive form 29 are expanded to the design size and provided on the left, right, top and bottom of the driving form 28.
Form lock jack 3 by extending 2, 32
The pin 33 pivotally attached to the second piston rod is the passive formwork 29.
The driving form 28 and the passive form 29 are fixed to each other.

On the other hand, when the diameter is reduced, the passive formwork 29, 29, 2
9 is the driving form 28, 2 by removing the link 30.
It can be attached to and detached from Nos. 8 and 28, and by exchanging with passive formwork having different arc lengths, it is possible to cope with shafts of various inner diameters. Then, depending on the curvature and the arc length of the passive formwork, the cross section of the formwork 14 which should be circular is not a perfect circle and is distorted, but the interior of the temporary earth retention is finally filled with concrete. The inner diameter does not have to be a perfect circle and does not hinder construction.

Further, as shown in FIGS. 3 and 6, the frame of the end plate opening / closing device 17 and the hydraulic jacks 20, 20, ... Are radially divided into hinge pushing plates 34, 34 ,.
, And a rubber gable plate 35 having a hollow truncated cone shape 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 vertical shaft, and when the hydraulic jacks 20, 20, ...
The lower surface of the end plate 35 is pressed in the direction of radial expansion by 4, 34, ...
Prevent the concrete from flowing out by pressing it against # 3.

In the temporary earth retaining work, the temporary earth 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 earth retaining 36 as shown in FIG. Then, the pushing plates 25, 25, 25 are pressed against the inner peripheral surface of the existing temporary earth retaining 36 to fix the temporary earth retaining concrete formwork device 6.

Subsequently, the hydraulic jacks 19, 19, 19 of the mold expanding / contracting device 16 are driven to expand the mold 14 to a preset outer diameter, and the mold lock jacks 32, 3 described above are used.
2, the driving molds 28, 28, 28 and the passive molds 29, 29, 29 are fixed and held in a circular shape. Then, the end plate opening / closing device 17 is driven to move the end plate 35 to the form 14
It is pressed against 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 earth retaining concrete formwork device 6 at a predetermined position, the passive formwork 2 which 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 ports 37, 37 ,.

After the concrete is hardened and the temporary earth retaining is completed, the mold 14 is demolded and moved by reversing the above procedure, and the temporary earth retaining is continuously performed while descending in parallel with the excavation work.

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

[0024]

EFFECTS OF THE INVENTION Since the present invention is configured as described in detail in the above-mentioned one embodiment, the series of operations of installing a concrete formwork in a shaft, placing temporary earth retaining concrete, and removing the formwork are unmanned. This can contribute to labor saving and improvement of safety. In addition, the outer diameter of the form can be easily changed, and since it has versatility that can correspond to various construction specifications, it will not waste investment cost, and will be effective in shortening the construction period and saving labor. .

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an upper portion of a shaft excavating device showing an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional end view of the lower portion of the shaft excavating device.

FIG. 3 is a vertical cross-sectional view of a temporary earth retaining concrete formwork device.

4 is a view showing the gripper device and is a view taken along the line AA of FIG.

FIG. 5 is a view taken along the line BB of FIG. 3, showing the mold expanding / contracting device.

6 is a cross-sectional view taken along the line CC of FIG. 3, showing the end plate opening / closing device.

[Explanation of Codes] 1 Vertical shaft excavating device 4 Traveling vehicle 5 Crane 6 Temporary earth retaining concrete formwork device 13 Well wall 14 Formwork 15 Gripper device 16 Formwork expanding / contracting device 17 Gable plate opening / closing device 18,19,20 Hydraulic jack 21 Tube frame 22 Vertical frame 28 Driven formwork 29 Passive formwork 30 Link 31 Pin hole 32 Formwork lock jack 33 Pin 34 Hinge push plate 35 Gable plate 36 Existing temporary earth retaining 37 Concrete pouring mouth

 ─────────────────────────────────────────────────── ─── Continuation of front page (71) Applicant 000207780 Taiho Construction Co., Ltd. 1-24-4 Shinkawa, Chuo-ku, Tokyo (71) Applicant 391035795 Shiroishi Co., Ltd. 2-4-1 Marunouchi, Chiyoda-ku, Tokyo (72) ) Inventor Akira Matsuyama 2-3-24 Yokota, Atsuta-ku, Nagoya-shi, Aichi Chuo Electric Power Co., Inc. Central Transmission and Substation Construction Site (72) Inventor Hirokazu Inagaki 2-1, Tsukudo-cho, Shinjuku-ku, Tokyo Kumagaya Gumi Tokyo Head office

Claims (1)

[Claims] 1. A plurality of jacks are arranged radially in a horizontal direction and are connected by a frame, and the frames connecting the plurality of jacks are arranged in three layers and are integrally connected by a vertical frame, and the three layers are formed. In addition to providing a crane wire connection on the upper part of the frame, the upper layer jacks are each equipped with a push plate to form a gripper device, and the intermediate layer jacks are each equipped with a segmented vertical formwork. Forming an expansion / contraction device, a segment-shaped passive formwork is linked by a link between the formwork attached to the jack to be expandable / contractible, and the passive formwork is exchangeable to form a vertical shaft formwork,
On the lower layer frame, hinge push plates arranged in a segment shape on the outer periphery of the frame are pivotally mounted so as to be rotatable up and down, and the jacks are interposed between the frame and the hinge push plate. The hinge push plate is expandable and contractible, and a hollow frustoconical shape molded from an elastic resin material such as rubber and having a diameter larger than the outer diameter of the hinge push plate is mounted on the hinge push plates arranged in an annular shape. To form an end plate opening / closing device, and press the inner wall surface of the end plate with the hinge pushing plate so that the end plate can be pressed against the lower end surface of the formwork and the pit wall surface of the vertical shaft. .