JPH05311994A - Gable form device - Google Patents

Abstract

PURPOSE:To make it possible to block tightly a gap between side walls of a gable form with simple construction by expanding an elastic tube after a rod of a jack is extended to project the gable form and elastic tube. CONSTITUTION:In a gable section 3a of a form 3 enlarged in an approximate semicircular shape against an excavated wall 8, oil is supplied to a jack 22 of each of gable form devices 20, and each rod 23 is interlocked. Then, a gable form 25 and a U-shaped elastic tube 26 are projected from a jack case 21, until the front end of the gable form 25 is brought into contact with a bedrock 7. A rod 23 is extended by a required portion in correspondence with the uneveness of the excavated wall 8. After that, when fluid is poured into the elastic tube 26 to expand, adjacent elastic tubes are made to adhere to each other. A gap to be lined primarily with concrete between side walls of the gable form is tightly blocked by the gable forms 25 and the elastic tubes 26 arranged over the overall circumference of the gable section 3a of the form 3 in such a way.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a formwork device used for the primary lining of tunnels such as mountain tunnels, and more particularly to a formwork which is expanded in a semicircular shape along an excavated wall surface. To a gable formwork device for closing the gable side of the.

[0002]

2. Description of the Related Art Heretofore, in the primary lining on the excavated wall surface of a mountain tunnel, there has been proposed a movable formwork device provided with a crawler instead of the spraying method. This formwork device is a type of steel formwork that follows the excavation cross section along the excavation cross section for reasons such as suppressing dust generation, which is a drawback of the spraying method, and eliminating economic loss due to rebound of aggregates, etc. The mold is then placed and filled with fresh concrete by pouring it into the gap between the ground and the mold, and the mold is demolded after the required strength is developed to form a smooth lining surface. This formwork device is shown in FIGS. In the figure, reference numeral 1 is a movable formwork device, 2 is a crawler, 3 is a steel formwork, 4 is a jack for expanding the steel formwork on an excavation wall surface, 5 is a rubber tube for damming, and 6 is packing. , 7 is a natural ground, 8 is an excavated wall surface, 9 is lining concrete that was previously cast, 10 is a gap, and 11 is a casting pipe.

[0003]

However, in the lining method using the above-described formwork device, when focusing on the end portion of the formwork, the rubber tube 5 is inflated to serve as a endlock and the surface is brought into contact with the excavation wall surface 8. Since the structure is such that the end of the gap 10 is closed, if the degree of unevenness of the circular or horseshoe-shaped excavation cross section is large, there is a limit to the size even if the rubber tube 5 is fully expanded. May not be completely blocked. If the gable side cannot be completely closed by the rubber tube 5, fresh concrete cannot be placed in the gap 10, and the work of filling the gap between the surface of the rubber tube 5 and the excavated wall surface 8 is added. It was troublesome and the work efficiency was poor. Also,
As means for solving this in such circumstances, as shown in FIGS. 13 to 14, for example, as shown in FIGS.
There is known a gable formwork device in which a closing plate 13 having a gap of 2, ... Is slidably installed so as to be retractable (Japanese Patent Laid-Open No. 2-54097). Wife formwork 12
There is a problem in that the mechanism for retracting and retracting from the inside is complicated, and it is difficult to install it inside the gable form 12 in a narrow space.

The present invention has been made in view of the above problems, and in a formwork of a formwork device for primary lining even in a tunnel such as a mountain tunnel where there is a large unevenness in the shape of the excavated cross section. An object of the present invention is to provide a gable form device capable of easily and completely closing the gable side with a simple structure.

[0005]

Means for Solving the Problems The object of the present invention to solve the above problems and achieve the above objects is to provide a substantially semicircular formwork lined along an excavation wall surface with a gap, A gable formwork device, which is arranged in a required number over the entire circumference of the gable part and closes a gap between the gable parts of the formwork, wherein one end side is fixed to the gable part of the formwork and a jack is internally provided. A jack case, a jack whose one end side is fixed to the jack case and which is internally installed, a gable frame which can be freely retracted from the jack case in the natural direction by the jack, and a winding so as to cover a side wall of the gamma form. It is provided with a U-shaped expandable / contractible elastic tube that closes a gap between the side walls of the end molds adjacent to each other when rotated and expanded.

[0006]

According to the gable formwork device of the present invention, oil is supplied to the jacks of each gable formwork device and each rod is attached to the jack of each gable formwork device in the gable portion of the formwork which is expanded in a substantially semicircular shape with respect to the excavated wall surface. When interlocked and extended in the natural direction, from the jack case to the gable form and U
The J-shaped elastic tube protrudes, and the rod of the jack extends by a necessary amount according to the unevenness of the excavation wall surface until the tip of each gable form comes into contact with the ground.

After the extension operation of the jack rod is completed, fluid or air is appropriately poured into the elastic tube to inflate it. The expansion of this elastic tube causes the elastic tubes adjacent to each other to come into close contact with each other, and thus the gland form and the elastic tube arranged over the entire circumference of the grate part of the form form a gap for primary lining with concrete. It closes the side wall of the mold form.

After that, fresh concrete is poured into the gap, the expanding elastic tube is narrowed after a predetermined strength is developed, and then the rod of the jack housed in the jack case is retracted to make the gable mold. Immerse the frame and elastic tube in the jack case. In this way, the gusset side of the gap between the excavated wall surface and the formwork is closed to perform the primary lining.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a vertical cross-sectional view of a gable formwork apparatus according to the present invention, FIGS. 2 to 4 are respective line views of FIG. 1, and FIG. 5 shows a gable formwork and elastic tube of the gable formwork apparatus. It is a perspective view of the state which made it. In the drawings, reference numeral 20 is a gable form according to the present invention, 21 is a jack case, 22 is a jack, 23 is a rod, 24 is a fixing plate, 25 is a gable form, 26 is an elastic tube, 27 is an injection hose, and 28 is Each padding rubber is shown. The parts corresponding to the conventional example are given the same reference numerals for easy understanding.

The structure of the gable formwork apparatus 20 of the present invention will be described. The gable formwork device 20 is mounted on the gable portion 3a of the formwork 3 of the movable formwork device 1 in which the excavation wall surface 8 is first lined by the concrete method after excavating the ground 7 for a predetermined length in a mountain tunnel. It is provided.

That is, a required number of substantially semicircular molds 3 lined along the excavation wall surface 8 with a gap 10 are arranged all around the end portion 3a, and the molds 3 are formed. Gap 1 of wife part 3a
0 is closed for concrete pouring,
One end 20a is fixed to the end portion 3a of the mold 3 with bolts and nuts and the like, and a jack case 21 that houses the jack 22 and one end 22a is fixed to the jack case 21 with bolts and the like. Jack 22
A gable form 25 (25a, 25b) fixed to the tip of the rod 23 of the jack 22 so as to be retractable from the jack case 21 in the natural direction 7 and side walls 25c, 25d of the gable form 25. It is provided with a U-shaped expandable and contractible elastic tube 26 that closes the gap between the side walls of the end form 25 (between the adjacent 25c and 25d) when it is wound so as to cover and expands. The wife formwork device 20.

The jack case 21 is a rectangular metal frame body having a length and width of about 180 mm and a total length of about 800 to 900 mm. At the tip of the rod 23 of the jack 22, a gable form 25
Is fixed to the rod 23 with a bolt 24a via a flat plate-shaped fixing plate 24 integrally welded thereto.

This gable form 25 is a flat metal plate 25.
It is a rectangular box body in which a, 25b, 25c, and 25d are welded to each other, and surrounds the entire body of the jack 22. And the rod 23 of the jack 22
With the expansion and contraction, the jack case 21 can be freely retracted and retracted from the tip.

The elastic tube 26 has the end frame 25.
It is wound so as to cover the plates 25c and 25d which will be the side walls, and both ends thereof are sandwiched between the plates 25c and 25d by the tube fixing plate 25e and bolts 25f. Further, at one end of the elastic tube 26, in order to make the elastic tube 26 expandable and contractible, an opening 27a is provided for supplying a filling material such as air or water into the hollow inside thereof.

The elastic tube 26 is made of rubber and has a U
It is a letter-shaped bag. The jack form 21 can be retracted and retracted as the gable form 25 moves.

Between the tip of the jack case 21 and the plate 25a of the end form 25, the primary lining concrete is prevented from entering the jack case 21, as shown in FIGS. A padding rubber 28 is provided. The padding rubber 28 is an L-shaped angle mounting bracket 2
The bolts 9 and 29 are fastened and sandwiched by bolts 30 and nuts 31 and fixed to the jack case 21 by bolts 32. Further, an injection hose 27 that penetrates from the rear end of the jack case 21 and is connected to the opening 27a is provided as shown in FIGS. 1 and 6, and the other end side is not shown in the drawing. It is connected to the supply port of a compressor for water etc.

Thus, the gable formwork device 2 according to the present invention
0 is formed, and the required number is arranged in the mold 3 of the mold device 1. A method of constructing the primary lining concrete with the gable formwork 20 will be described. As shown in FIGS. 7 to 9, first, the formwork 3 of the formwork apparatus 1 is excavated at a place where the primary concrete lining is to be made. Expand along the wall surface 8.

Next, the oil is sent under pressure from the oil feeding device mounted on the formwork apparatus 1 to the jacks 22 of each jack case 21,
Each rod 23 is interlocked and extended. Along with this, as shown in FIGS. 7A and 7B, the elastic tube 26 and the end form 25 project in an oblique direction toward the natural ground 7. At this time, the rod 23 expands according to the large and small irregularities of the excavated wall surface 8 until the end surface of the elastic tube 26 comes into contact with the natural ground 7, as shown in FIGS. 8A and 9B. Therefore, when the pressing force of the rods 23 becomes constant, all the rods 23 have expanded to the required length, and at this time, the pressure feeding of oil from the oil feeding device is stopped.

Next, a filling material such as air or water is injected from the injection tube 27 into the hollow interior 26a of the elastic tube 26 of each gable form 25. As a result, the elastic tubes 26 expand greatly, and the elastic tubes 2 adjacent to each other are expanded.
The side surface of 6 is pressure-contacted as shown in FIGS. In this way, the gap between the end portions 3a of the formwork 3 becomes
The plate 25a and the elastic tube 26 are closed.

Next, from the state shown in FIG. 8 (a), fresh concrete is poured and filled into the gap 10 from the casting pipe 11 (see FIG. 12) of the formwork 3. When the fresh concrete reaches the required strength, the elastic tube 26
The elastic tube 26 is narrowed by removing the filling material from the opening 27a to the compressor via the injection hose 27.

Next, the rod 23 of the jack 22 is interlocked and retracted so that the elastic tube 26 and the end form 25 are retracted into the respective jack cases 21. Then, the formwork 3 of the formwork apparatus 1 is demolded, and the formwork apparatus 1 is moved to another place. In this way, the primary lining concrete surface is shown in Fig. 8.
As shown in (b). The lining surface has a rhombus-shaped cross section, and the left end portion reaches the upper part of the face 8a in the plane of FIG. 8B, so that the ground 7 is prevented from collapsing in the next excavation of the face. It is a thing.

In this way, the primary lining concrete surface using the gable formwork apparatus 20 of the present invention is formed. As another embodiment of the end form device 20, as shown in FIG. 10, a rectangular unevenness 26b is provided on the side surface of the elastic tube 26. In this way, the side surfaces of the elastic tubes 26 adjacent to each other are more closely pressed against each other, and leakage of the poured concrete is prevented with high performance. Further, it is also preferable that the cross-sectional shape of the unevenness 26b be various uneven shapes such as a sine curve, a cosine curve, a triangular shape, and a trapezoidal shape. Although the elastic tube 26 is made to project and retract in an oblique direction with respect to the natural ground 7, it may of course be in the vertical direction.

[0023]

As described above, the gable formwork apparatus of the present invention has a substantially semicircular formwork lined along the excavation wall surface with a gap over the entire circumference of the gable portion. And a jack case in which one end side is fixed to the end portion of the mold and a jack is installed, and the jack case. A jack whose one end side is fixed to the inside, a gable form which is freely retractable from the jack case in the ground direction by the jack, and a side wall of the gable form that is wound and expanded. Since the U-shaped expandable and contractible elastic tube for closing the gap between the side walls of the end-to-end form adjacent to each other is provided, the gap between the side walls of the end-to-end form can be tightly closed with a simple structure. You can

Further, since the gable formwork and the elastic tube project obliquely to the face of the natural ground, it is not necessary for an operator to go around the face of the formwork to close the end of the gable face, which eliminates the need for work. The danger of collapse is eliminated. Since the primary lining is performed up to the upper part of the face, the next excavation of face eliminates obstacles such as the collapse of the ground and improves work efficiency.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a gable formwork apparatus according to the present invention.

FIG. 2 is a sectional view taken along line aa of FIG.

3 is a cross-sectional view taken along the line bb of FIG.

FIG. 4 is a sectional view taken along line cc of FIG.

FIG. 5 is a side sectional view showing a part of the gable formwork device.

FIG. 6 is a perspective view of a gable formwork device.

FIG. 7 is an explanatory view (a) showing a usage state of the gable formwork device;
It is (b).

FIG. 8 is an explanatory view (a) showing a usage state of the gable formwork apparatus and an explanatory view after removing the mold.

9 (a) and 9 (b) are explanatory views (a) and (b) showing a protruding state of the end form and the elastic tube of the end form device.

FIG. 10 is a cross-sectional view of a part of adjacent gable formwork.

FIG. 11 is an explanatory diagram showing a usage state of the formwork apparatus according to the conventional example.

FIG. 12 is a partially enlarged sectional view of the same.

FIG. 13 is an explanatory diagram according to another embodiment of the conventional example.

FIG. 14 is a partially enlarged plan view (a) and a front view (b) of the same.

[Explanation of symbols]

20 gable form, 21 jack case, 2 according to the present invention
2 jacks, 23 rods, 24 fixed plates, 2
5 gable formwork, 26 elastic tubes, 27 injection hoses,
28 Rubber for padding.

Claims (1)

[Claims] 1. A required number of substantially semicircular molds, which are lined along the wall surface of the excavation with a gap, are arranged all around the end of the mold, and the gaps between the end portions of the mold are A gable formwork device for closing, a jack case having one end side fixed to the grate part of the formwork and having a jack inside, a jack having one end side fixedly mounted inside the jack case, and the jack A gable form that is freely retractable from the jack case in the natural direction, and a gap between the side walls of the gable form that is wound so as to cover the side wall of the gable form and expands when adjacent to each other. A gable formwork device comprising a U-shaped elastic tube that is expandable and contractible.