JPH10140825A - Mold for lining of shaft, and method for lining shaft using the mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the weight of a mold, to improve the workability, and to increase the economical effect by inserting the mold to which an air bag to be inflated/contracted in the diameter direction with the compressed air into a shaft, and placing the mortar in the clearance. SOLUTION: A cylindrical air bag 4 is fitted to the outside of a steel inner cylinder 3 provided with a compressed air pouring valve 6 and a discharge valve 7 to constitute a mold 1. The air bag 4 is made of fiber-reinforced rubber or resin which is capable of inflating or contracting in the diameter direction of the mold 1, and an inner side surface 4b is adhered to the steel inner cylinder 3 with the adhesive, etc. The mold 1 with the air bag 4 in a contracted condition is inserted in a shaft 2, the pouring valve 6 is opened to inflate the air bag 4, and the mortar is poured in an inclined guide 17, and placed in a clearance 5 to line a wall hole. When the mortar is of the prescribed strength, the discharge valve 7 is opened to allow an outside surface 4a to be separated, the mold 1 is pulled up onto the ground to complete the lining. The earth retaining work is unmanned, the safety is improved and the execution property is improved thereby.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for retaining a mortar, which is one of methods for retaining a hole in a vertical hole to be excavated for the foundation work in the foundation work of a bridge or a transmission line tower in a mountainous area. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical hole lining form suitable for use in an automatic lining method, and a vertical hole lining method using the form.

[0002]

2. Description of the Related Art Hitherto, in the construction of a relatively small vertical hole in a mountainous area, it has been difficult to mechanize in terms of the construction environment, the cost of bringing in a machine, and the like. However, in recent years, construction with the introduction of automated lining technology has been performed in order to reduce the working population and to solve the problems of work safety and difficult work.

[0003]

[0009] In the vertical hole, the soil was manually retained using a lining material such as a liner plate, but work in the narrow vertical hole was difficult, and there was a problem in safety. . As mentioned above, there was a request for automation, but it is difficult to automate the conventional lining technology, so instead of lining with a liner plate, by introducing mortar-in-place lining, There is a technology that realized automation of vertical hole lining. However, the formwork apparatus used has a heavy mechanical weight due to a hydraulic automatic mechanism, has poor workability, and has a negative effect on construction costs.

In view of the above-mentioned circumstances, the present invention solves the above-mentioned problems (1), (2), and (3) to enhance the technology of automating mortar, which is a method of retaining mortar, which is a method of retaining soil during excavation, by unmanning the retaining work in a vertical hole. The purpose of the present invention is to provide a vertical hole lining formwork capable of improving safety, improving workability and improving economic effects by improving the efficiency, and a vertical hole lining method using the formwork. And

[0005]

According to the present invention, there is provided a vertical hole lining form according to the present invention, comprising: an inner cylinder made of a hard material; The air bag is made of a rubber or resin air bag that expands into a predetermined shape when filled with the air bag, and the outer surface of the air bag is a mold face plate.

Further, according to the vertical hole lining method of the present invention, an inner cylinder made of a hard material is fitted in the hole being excavated, and the inner cylinder is fitted with the inner cylinder. Or, insert a pneumatic lining formwork consisting of a resin airbag and assemble the formwork by inflating the airbag by supplying compressed air to the airbag by remote control, and assembling the formwork. By pouring mortar in the gap between the frame face plate and the hole wall ground being excavated to cover the hole wall, and after the mortar is hardened, the compressed air in the air bag is exhausted to shrink the air bag. The mold is removed from the mold.

According to the present invention, the outer side surface of the air bag filled with compressed air is used as a mold face plate instead of the automatic split mold that expands and contracts by hydraulic drive, and the air bag is inflated and contracted by air pressure. With a simple mechanism of assembling (set) and demolding, the weight reduction and improvement of the construction technology are achieved, and the unmanned construction in the excavation hole is enhanced.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. The present invention is characterized by a pneumatic lining form mechanism, and in the first embodiment shown in FIGS.
The state in which the pneumatic lining formwork 1 is suspended in the standing hole 2 during excavation is shown.

In each of the drawings, a pneumatic lining form 1 mainly includes a steel inner cylinder (wheel) 3 and a cylindrical air bag (air bag) 4 fitted outside the steel inner cylinder 3. It is configured as a prime. The steel inner cylinder 3 has a function as a support frame when the air bag 4 is inflated and contracted. The height and diameter of the steel inner cylinder 3 and the air bag 4 are determined according to the inner diameter of the upright hole 2 to be excavated. For example, when the inner diameter of the upright hole 1 is about 3020φ, Approximately 280 external dimensions of steel inner cylinder 3
0φ, outer diameter about 3000 when the air bag 4 is inflated (set)
φ, dimensions about 2800φ at the time of demolding and shrinkage, height 1500 mm, and a gap 5 for mortar filling of about 10 to 20 cm between the hole wall ground surface during excavation and the expanded mold air bag outer surface. It is configured to be formed.

More specifically, the steel inner cylinder 3 is formed of a cylindrical body having a predetermined thickness, and the thick pipes have ventilation pipes 8 and 9 penetrating therethrough so as to communicate with the air bladder 4 so that the compressed air is compressed. , And an exhaust valve (electromagnetic valve) 7 are provided. Air supply piping (hose)
The other end of the air supply pipe 10 is connected to a compressed air supply device installed on the ground (not shown). Further, the pneumatic lining form 1 is suspended and inserted into the upright hole 2 being excavated.
An engagement hole 11 is provided at the upper end of the inner periphery of the, and the lower end of the hanging rope 12 is suspended and supported by the engagement hole 11. The upper end of the suspension rope 12 is wound around a drum of a hoisting machine installed on the ground (not shown).

The air bag 4 can be inflated by injection of compressed air,
The inner surface 4b and the outer surface 4a are made of a material that can be contracted by discharging, for example, rubber or resin containing reinforcing fibers.
The upper end surface 4c closing the upper and lower ends between the inner and outer surfaces 4a and 4b and the lower end surface 4d form a tubular body having a predetermined thickness when inflated. Inner surface 4 of this air bag 4
b and the steel inner cylinder 3 are fixed using, for example, an adhesive so as to be integrated with each other, but the air bag 4 is integrated with the steel inner cylinder 3 using other means. Or you may comprise so that attachment and detachment may be fixed.

The air bladder 4 is preferably constructed so that the outer surface 4a, which is a mold face plate, can reliably hold the desired shape when inflated. For example, in the case of the illustrated example, the air bladder 4 is used. Inside of the first reinforcing member 13 made of a normal elastic band material such as rubber connecting the inner side surface 4b and the outer side surface 4a.
And a second reinforcing member 1 made of a non-stretchable band material such as fiber-containing rubber
4 are alternately provided in the circumferential direction at predetermined intervals by bonding or the like.

Therefore, when the air bladder 4 is inflated by the injection of compressed air, the first reinforcing member 13 expands due to its elasticity, and the second reinforcing member 14 does not expand but is folded. It straightens from its state to its original length and serves to regulate further inflation of the bladder 4. By the combined action of the first and second reinforcing members 13 and 14, when the air bag 4 is inflated, the outer side surface 4a can surely hold the desired shape. In addition, as the air in the air bag 4 is exhausted when the mold is released, the expanded first reinforcing member 13 contracts, and the air bag 4 contracts while its outer diameter shrinks. At this time, the second reinforcing member 14 is folded.
Note that there is a gap 15 between the lower ends of the first and second reinforcing members 13 and 14 and the lower end surface 4d of the air bag 4, and the first 15
The inside of the air bag 4 is also communicated without being partitioned by the second reinforcing members 13 and 14, and the ventilation pipe 8 extends from the injection valve 6 through the steel inner cylinder 3 and into the air bag 4.
And a ventilation pipe 9 extending from the exhaust valve 7 through the steel inner cylinder 3 and extending into the air bladder 4 at different positions, but communicating with each other, so that the compressed air can be smoothly injected into the air bladder 4. Exhaust is performed. The first and second reinforcing members 13 and 14 are disposed in the air bag 4 as flexible beams (beam members) in order to securely hold the air bag 4 in the desired shape when inflated. However, this configuration may be omitted, or a support having another structure may be used instead. A plurality of positioning projections 23 are provided on the upper part of the air bladder 4 so as to be inflated by compressed air. The positioning projections 23 are for preventing the upper portion of the air bag 4 from swelling in an irregular shape and entering the gap 5 or the like while being deformed.

Next, the operation of the first embodiment will be described. FIG. 1 is a vertical sectional view showing a state immediately after the pneumatic lining form 1 suspended by the suspension rope 10 has reached the bottom surface 2a of the standing hole 2 during excavation. 4 is a plan view corresponding to FIG. 1, and FIG. 5 is a cross-sectional view corresponding to FIG. In each of the above figures, the form 1
When the air bag 4 is suspended and gradually inserted into the upright hole 2 from above, the air bag 4 is contracted by evacuating the air in the bag so as not to hit the inner wall of the hole. In this state, a lining layer of a fluid mortar 16 is cast on the inner wall of the hole above the height h of the pneumatic lining mold 1 to perform the lining inside the hole. The mortar 16 has not yet been cast on the inner wall of the vertical hole at the same height position as the height h.

Next, by remote control from the ground, the injection valve 6 is opened to supply compressed air from the air compressor to the air supply pipe 10.
And the air bag 4 is filled therein, and the air bag 4 is uniformly inflated in the vertical axis direction until the air bag 4 has a constant diameter in the diameter direction of the cylindrical lining form 1. After the air bladder 4 is inflated to a predetermined shape and the injection valve 6 is closed, it becomes as shown in FIGS.

As shown in FIG. 2, the air bag 4 is provided so that when it is inflated, an inclined guide recess 17 is formed outside the upper end thereof. Is led to the gap (about 10 cm) 5 between the outer surface (ie, the mold face plate) 4a of the air bag 4 and the vertical hole wall ground 19 via the inclined guide recess 17 and the gap 5 Mortar 16 is cast to cover the hole wall.

Next, as shown in FIG. 3, when the time for cooling the cast mortar 16 has reached the required strength, the exhaust valve 7 of the air bag 4 is set on the ground to release the lining form. At this time, the outer surface 4a of the air bag 4 is peeled off from the inner peripheral surface of the hardened mortar 16 by utilizing the vacuum effect by forced exhaust. At the time of this peeling, the contraction force of the first reinforcing member 13 acts more reliably. Furthermore, mortar 1
In order to facilitate separation of the air bag 4 from the air bag 4, the outer surface 4a of the air bag 4 is painted with oil or fat in advance. For this reason, the air bag 4 is made of a material having a resistance to repeated expansion and contraction and an oil resistance.

As described above, the pour of the mortar 16 is completed, the pneumatic lining form 1 peeled off from the mortar 16 and the air bag 4 contracted is pulled up to the ground, and the lining operation is completed.

FIGS. 7 to 9 show a second embodiment of the present invention. In the first embodiment, the steel inner cylinder 3 is shown as having an integral structure, whereas in the second embodiment, the steel inner cylinder 3 is divided into two, and the joining flanges 2 at both ends thereof are provided.
In addition, by joining the bolts 21 to each other, a bolt 21 is inserted into a bolt hole provided in the flange, and a nut 22 is fastened, the pair of opposed steel inner cylinder members 3a, 3a are integrated, and the steel inner cylinder member 3a is integrated. The cylinder 3 is configured. The other configuration is the same as that of the first embodiment, and therefore, the same components are denoted by the same reference numerals and the description thereof will not be repeated.

In carrying out the present invention, the above-described specific structure may be further changed in design as necessary, and the present invention includes these various modifications made by those skilled in the art.

[0021]

As described above, according to the present invention, the vertical hole forming form is fitted to the inner cylinder made of a hard material, and the inner cylinder is fitted into the inner cylinder, and filled with compressed air to form a predetermined shape. It is composed of an inflatable rubber or resin air bag, and the outer surface of this air bag is configured as a mold face plate. In addition, the workability is improved, the economic effect is enhanced, and the unmanned construction in the hole can be enhanced.

Further, according to the vertical hole lining method of the present invention, an inner cylinder made of a hard material is fitted in the hole being excavated, and a rubber or resin having an outer surface formed by a mold face plate. Inserting a pneumatic lining formwork consisting of an air bag and an airbag, inflating the airbag by supplying compressed air to the airbag by remote control, assembling the formwork, and forming the outer formwork. The mortar is poured into the gap between the face plate and the hole wall under excavation to cover the hole wall, and after the mortar hardens, the compressed air in the air bag is exhausted through the valve to shrink the air bag. Since the mold is removed from the mold, the weight of the mold used for automated place-in-place mortar in vertical hole construction is reduced,
The workability is improved, and the work of vertical hole lining can be performed quickly.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view of a pneumatic lining form according to a first embodiment of the present invention immediately after insertion into a standing hole.

FIG. 2 is a longitudinal sectional view of the air bag shown in FIG. 1 when inflated.

FIG. 3 is a vertical cross-sectional view of FIG. 2 after mortar filling and shrinkage of an air bag.

FIG. 4 is a plan view of FIG. 1;

FIG. 5 is a cross-sectional plan view of FIG.

FIG. 6 is a cross-sectional view of FIG. 2 when mortar is filled.

FIG. 7 is a longitudinal sectional view of the pneumatic lining form according to the first embodiment of the present invention when the air bag is inflated after being inserted into the upright hole.

FIG. 8 is a plan view of FIG. 7;

FIG. 9 is a cross-sectional plan view of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pneumatic lining formwork 2 Vertical hole 3 Steel inner cylinder 4 Air bag 5 Gap 6 Injection valve 7 Exhaust valve 8 Ventilation pipe 9 Ventilation pipe 10 Air supply pipe 11 Engagement hole 12 Hanging rope 13 First reinforcement 14 second reinforcing material 15 gap 16 mortar 17 inclined guide recess 18 mortar injection pipe 19 vertical hole wall ground 20 flange 21 bolt 22 nut 23 positioning projection

Claims (2)

[Claims] 1. An inner cylinder made of a hard material, and an air bag made of rubber or resin fitted to the inner cylinder and inflated into a predetermined shape by being filled with compressed air. A vertical hole lining form having a configuration in which an outer surface of the form is a form face plate. 2. A pneumatic cover comprising an inner cylinder made of a hard material and a rubber or resin air bag fitted in the inner cylinder and having an outer surface formed by a form plate in a hole being excavated. Inserting a working form, assembling the form by inflating the air bag by supplying compressed air by remote control to the air bag, and performing the assembling of the form surface plate on the outer surface and the hole wall ground during excavation. Pour mortar into the gap of the lining to cover the hole wall, and after curing the mortar,
A vertical hole covering method, wherein the mold is released from the mold by evacuating compressed air in the air bag and contracting the air bag.