JP7256911B1 - Yamadome method - Google Patents

Abstract

[Problem] It is possible to construct earth retaining in places where it is difficult to bring in heavy machinery in advance due to soft ground or obstacles in the sky, and start construction using versatile earth retaining members. It is possible to shorten the period of material preparation in advance, and all earth retaining members can be removed, so that a temporary work passage or work platform can be secured at a disaster recovery construction site such as a landslide. Provide construction methods. SOLUTION: When constructing mountain retaining frame structures 1a, 1b, 1c provided with struts 2, wales 3, and mountain retaining panels 4 made of sheet piles as mountain retainings, the mountain retaining frame structures 1a, 1b, 1c are assembled and dismantled. It is possible to build the earth retaining frame structures 1a, 1b, and 1c in the starting shaft, excavate the front of the earth retaining frame structure with an excavator such as a shovel, and use the main pushing jack installed in the starting shaft. The earth retaining frame structures 1b and 1c succeeding to the rear of the leading earth retaining frame structure 1a are constructed in starting shafts and pushed out sequentially. [Selection drawing] Fig. 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth retaining method capable of securing temporary work passages and work gantrys at disaster recovery construction sites such as landslides.

In order to secure temporary work passages and work platforms, it is necessary to construct earth retaining. All are constructed by erecting and inserting earth retaining members from the top.

Therefore, when there are obstacles in the sky, or when heavy machinery, cranes, etc. cannot enter the upper part of the earth retaining structure in advance, it is difficult to construct the earth retaining structure.

As a construction method for installing a concrete box such as a box culvert and then backfilling, there are the open shield construction method and the OSJ construction method (registered trademark).

The open shield construction method, which is also described in the following patent document, excavates while correcting the direction of the open shield machine with a jack, and excavates the open shield machine by applying reaction force to the concrete box to be installed.
JP 2019-7191 A

The OSJ construction method, which is also described in the following patent document, excavates while adjusting the direction of the shield machine with a jack, compacts by taking the reaction force into the backfill soil, excavates in a short work yard, installs the box, This is a construction method in which backfilling is performed continuously.
Japanese Patent No. 3096974

In the open shield construction method, the main structure of the concrete box to be built must be a structure that can withstand the propulsion force, and this construction method cannot be used for poorly installed structures.

In the OSJ construction method, there is a method in which the OSJ machine is used as the earth retaining material for earth retaining work, and the earth retaining material is constructed inside the OSJ machine using earth retaining materials and horizontal sheet piles. Aerial work lifting height is required for backfilling the outside, and a special large earth retaining machine called a dedicated OSJ machine is required, which increases construction costs and requires a preparation period before construction starts.

Although it is possible to construct earth retaining materials in the OSJ aircraft, it is not possible to remove the earth retaining materials after construction.

The object of the present invention is to eliminate the disadvantages of the conventional example described above, and to enable the construction of earth retaining walls in places where it is difficult to bring in heavy machinery in advance due to soft ground or obstacles in the sky. Since it is possible to carry out construction by using general-purpose earth retaining members as in the case of normal construction, it is possible to shorten the material preparation period before the start of construction. Since it is possible to remove everything, it is possible to use leasing materials, which is economical and can be used to secure temporary work passages and work platforms at landslides and other disaster recovery construction sites. is to provide

In order to achieve the above object, the present invention as set forth in claim 1 provides an earth retaining frame structure having earth retaining panels made up of struts, wales, and sheet piles, and between struts that are spanned in the width direction. When constructing a rectangular framework by extending wales in an orthogonal direction, installing columns between the upper and lower rectangular frameworks, and assembling the whole into a box shape, the mountain retaining frame structure can be assembled and dismantled. The earth retaining frame structure is constructed in the starting shaft, the front of this earth retaining frame structure is excavated with an excavator such as a shovel, and the front pushing jack installed in the starting vertical shaft is used to excavate the earth retaining frame structure at the beginning. The gist of this is that the mountain retaining frame structure that follows the frame structure is constructed in the starting shaft and pushed out in sequence.

According to the first aspect of the present invention, an earth retaining frame structure having earth retaining panels is constructed in a starting shaft for earth retaining by struts, wales and sheet piles, and is excavated in advance, so that heavy machinery can enter in advance. It is possible to install a mountain stop even in a difficult place or where there are obstacles in the sky.

In addition, the earth retaining frame structure equipped with earth retaining panels using struts, wale and sheet piles is made up of struts, wale and sheet piles, and it is possible to use versatile earth retaining members made of steel. Since it is only necessary to install the main push jack in the starting shaft at the beginning, it can be constructed at a low cost.

Furthermore, since the mountain retaining frame structure can be assembled and dismantled, it can be completely removed, so lease members can be used, which is economical.

The gist of the present invention according to claim 2 is that the top opening of the mountain retaining frame structure is closed with a lining plate to form a working gantry.

According to the second aspect of the present invention, an excavator such as a shovel for excavating in front of the earth retaining frame structure can be installed on the earth retaining frame structure for work. A work passage is formed above the earth retaining frame structure, and the excavator or the like can be carried in through this work passage.

The gist of the present invention according to claim 3 is that the mountain retaining panel is made of a panel material such as a sheet pile.

According to the third aspect of the present invention, the earth retaining panel is formed as a horizontal sheet pile by laying sheet piles horizontally, so that the earth retaining panel free from resistance to excavation of the earth retaining frame structure can be manufactured at a low cost. Easy to form.

According to the fourth aspect of the present invention, a propulsion jack is interposed between the leading earth retaining frame structure and the succeeding earth retaining frame structure, and between the succeeding earth retaining frame structures, and the propelling jack is used to interpose the leading earth retaining frame structure. The gist of this is to sequentially push out the mountain retaining frame structure and the succeeding mountain retaining frame structure.

According to the fourth aspect of the present invention, the propelling jacks are interposed between the leading earth retaining frame structure and the succeeding earth retaining frame structures, and between the succeeding earth retaining frame structures. The propeller jacks can be used to sequentially push out the tandem retaining frame structures, and the propeller jacks can be made smaller than when the entire structure is excavated using only the propeller jacks installed in the starting pit, and , the whole can be extruded smoothly without difficulty.

As described above, the earth retaining method of the present invention makes it possible to construct earth retaining walls in places where it is difficult to bring in heavy machinery in advance due to soft ground or obstacles in the sky. Since it is possible to carry out construction by using general-purpose earth retaining members as in the case of ordinary construction, it is possible to shorten the material preparation period before the start of construction, and all earth retaining members are used. Since it can be removed, leased members can be used economically, and it is possible to secure temporary work passages and work platforms at disaster recovery construction sites such as landslides.

It is a top view which shows the initial process at the time of the earth retaining installation work of the earth retaining method of this invention. It is a top view which shows the intermediate process at the time of the earth retaining installation work of the earth retaining method of this invention. It is a top view which shows the latter process at the time of the earth retaining installation work of the earth retaining method of this invention. It is a longitudinal side view which shows the initial process at the time of the earth retaining installation work of the earth retaining method of this invention. It is a longitudinal side view which shows the intermediate process at the time of the earth retaining installation work of the earth retaining method of this invention. It is a longitudinal side view which shows the latter process at the time of the earth retaining installation work of the earth retaining method of this invention. It is a vertical front view at the time of the earth retaining installation work of the earth retaining method of the present invention. FIG. 4 is a partial perspective view of a sheet pile used as a mountain retaining panel; It is a vertical side view of the initial process which shows the lining plate installation at the time of the earth retaining installation work of the earth retaining method of the present invention. It is a longitudinal side view of an intermediate process which shows covering plate installation at the time of earth retaining installation work of the earth retaining method of the present invention. It is a vertical cross-sectional view of the later process which shows the lining board installation at the time of the earth retaining installation work of the earth retaining method of the present invention. It is a longitudinal front view showing installation of a lining plate during earth retaining installation work of the earth retaining method of the present invention. It is a top view which shows the initial process at the time of the earth-retaining removal of the earth-retaining construction method of this invention. It is a top view which shows the intermediate process at the time of the earth-retaining removal of the earth-retaining construction method of this invention. It is a top view which shows the latter stage process at the time of the earth-retaining removal of the earth-retaining construction method of this invention. It is a longitudinal side view which shows the initial process at the time of earth retaining removal of the earth retaining method of this invention. It is a longitudinal side view which shows the intermediate process at the time of the earth-retaining removal of the earth-retaining construction method of this invention. It is a longitudinal side view which shows the latter stage process at the time of the earth retainer removal of the earth retainer construction method of this invention. It is a longitudinal front view at the time of removing the earth retaining method of the earth retaining method of the present invention.

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a plan view showing the initial steps of the earth retaining installation work of the earth retaining method of the present invention, and FIG. 4 is a vertical cross-sectional side view of the same. The mountain retaining frame structure provided with the mountain retaining panel 4 is shown.

A rectangular framework is formed by bridging the struts 2 in the width direction of the excavation with the wale 3 across the struts 2 in the orthogonal direction, and the pillars 6 are provided between the upper and lower rectangular frameworks to form the entire structure. Assemble into a box.

The struts 2 and the wales 3 use H-shaped steel materials that are widely used as mountain retainers, and as the mountain retainer panels 4, sheet piles 5 as shown in FIG. .

Further, when the sheet pile 5 is not used as the mountain retaining panel 4, it is also possible to use a panel material made of a flat steel plate.

The earth retaining frame structures 1a, 1b, and 1c are constructed by assembling struts 2 and wales 3 into a box-like shape as a whole with piercing pieces 9, corner pieces, etc., and pillars 6 as well. The mountain retaining panel 4 was attached by means of a retaining panel connection fitting and a camber 7 .

In the figure, 8 is the rear end of the mountain retaining frame structure 1a, 1b, 1c, which is a bearing steel material provided toward the rear, and is closed with a skirt iron plate 8a to form a jack bearing pressure receiving portion.

Of the earth retaining frame structures 1a, 1b and 1c, the earth retaining frame structure 1a positioned at the top may be shorter than the other earth retaining frame structures 1b and 1c.

In the mountain retaining frame structures 1a, 1b, and 1c, the struts 2, the wales 3, and the mountain retaining panels 4 can be assembled and dismantled.

Although not shown, a bottom plate may be provided on the mountain retaining frame structures 1a, 1b, and 1c.

Furthermore, the mountain retaining frame structures 1a, 1b, and 1c can be formed as a work gantry by closing the top opening with a covering plate 11. As shown in FIG.

A starting shaft (not shown) formed by sheet piles, wales, etc. is used to construct the top mountain retaining frame structure 1a, and the sheet pile in front of the mountain retaining frame structure 1a is cut out by opening the mirror, and an excavator such as a shovel is placed in front of it. is excavated, and the earth retaining frame structure 1a is excavated by a main pushing jack as a main pushing equipment installed in the starting vertical shaft.

When the first earth retaining frame structure 1a is completely extruded into the ground from the starting shaft, the second earth retaining frame structure 1b is constructed in the starting vertical shaft, together with the earth retaining frame structure 1a. Push out with the original pushing jack.

A propelling jack 10 is interposed between the leading earth retaining frame structure 1a and the succeeding earth retaining frame structure 1b and between the earth retaining frame structure 1b and the succeeding earth retaining frame structure 1c.

As shown in FIG. 7, at least four propulsion jacks 10 are provided horizontally near the corners of the earth retaining frame structures 1a, 1b, and 1c, and more may be provided.

The push-out of the leading earth retaining frame structure 1a can also be performed by using this propelling jack 10 and using the succeeding earth retaining frame structure 1b as a reaction force. You can do it.

As shown in FIGS. 2 and 5, after the leading earth retaining frame structure 1a is pushed out, the succeeding earth retaining frame structure 1b is pushed out from the starting shaft, and the succeeding earth retaining frame structure 1c is assembled in the starting vertical shaft. Push it out too.

When the propelling jack 10 is installed, the propelling jack 10 can sequentially push out the leading earth retaining frame structure 1a and the trailing earth retaining frame structures 1b and 1c. As shown in 6, when the leading earth retaining frame structure 1a is pushed out by the propelling jack 10 between the succeeding earth retaining frame structure 1b (FIGS. 2 and 5), the succeeding earth retaining frame structure 1b is pushed out. is further pushed out by the propelling jack 10 between the following mountain retaining frame structure 1c ((FIGS. 3 and 6), and the step of advancing the whole by the jack stroke of the propelling jack 10 is repeated, and the centipede , it proceeds like a caterpillar.

In the earth retaining frame structures 1a, 1b, and 1c, support materials for panels can be used for the struts 2, wale 3, and pillars 6, and keyholes and bolt holes for installing these support materials can be used. Since the earth retaining panel 4 is fixed to the frame so as not to move in the width direction, the frame is interposed between the earth retaining panels 4 and the front earth retaining panel is pushed through the frame for the extrusion. , the earth retaining panel 4 can be pushed in together with the frame without exerting an excessive force on the fixing part of the keyhole structure of the earth retaining panel.

In addition, a steel plate or the like is fixed to the outer side of the earth retaining panel 4 on the outside of the division between the earth retaining frame structures 1a, 1b, and 1c to prevent earth retaining defects caused by extension of the jack at the division. You can also protect the spot.

9 to 11 are process diagrams showing the installation of the lining plate 11. As described above, the mountain retaining frame structures 1a, 1b, and 1c can be formed as a work platform by closing the upper opening with the lining plate 11. By doing so, excavation in front of the earth retaining frame structure 1a, which is performed when pushing forward the earth retaining frame structure 1a, can also be performed by installing an excavator such as a shovel on the lining plate 11.

The lining plate 11 can be freely opened and closed, and if necessary, the lining plate 11 may not be placed on the top openings of the mountain retaining frame structures 1a, 1b, and 1c.

In addition, the mountain retaining frame structures 1a, 1b, and 1c can be pushed forward while the top opening is closed with the lining plate 11. As shown in FIG.

Next, a description will be given of the work of removing the retaining wall. There is no particular rule as to how to remove the earth retaining frame structures 1a, 1b, and 1c when they are no longer needed.

As for the place of dismantling, it is conceivable to form an arrival shaft with sheet piles or the like and carry out dismantling in this shaft.

In addition, since the lower cross beams (struts 2) of the earth retaining frame structures 1a, 1b, and 1c interfere with the construction of the structure foundation, they should be removed if necessary, and the structure foundation 13 should be constructed first with concrete or the like, and the earth retaining frame It is considered as a substitute for the lower beams of structures 1a, 1b, and 1c.

As an example, as shown in FIGS. 13 to 18, the propulsion jack 10 is replaced with a towing member 15 made of PC steel rods or PC steel wires and a towing jack 12 made of a center hole jack. 1c are towed sequentially or simultaneously to a predetermined location and dismantled sequentially.

By replacing the propulsion jack 10 with a traction member 15 made of PC steel rods or PC steel wires and a traction jack 12 made of a center hole jack, even a gate-type structure from which the lower cross beam (strut 2) has been removed can be moved forward safely. Consideration is given to

Depending on the extension that can be towed, some of the mountain retaining frame structures 1a, 1b, and 1c are connected integrally by connecting gaps (divided points) with connecting members 14 using bolts or the like.

1a, 1b, 1c... Earth retaining frame structure 2... Strut 3... Wing 4... Earth retaining panel 5... Sheet pile 6... Column 7... Earth retaining panel connecting fitting and camber 8... Bearing steel material 8a... Skirt iron plate 9... Strikeout piece 10... Promotion jack 11... Towing member 12... Towing jack 13... Structure foundation 14... Connecting member

Claims (4)

A rectangular framework is formed by crossing the struts in the width direction and crossing the wales in the orthogonal direction between the struts. However, when pillars are provided between the upper and lower rectangular frames and the whole is assembled into a box shape, the earth retaining frame structure can be assembled and dismantled, and the earth retaining frame structure is constructed at the starting shaft. Then, an excavator such as a shovel is used to excavate the front of the earth retaining frame structure, and the ground retaining frame structure succeeding to the rear of the leading earth retaining frame structure is started by excavating with a main pushing jack installed in the starting vertical shaft. The earth retaining method is characterized by constructing a shaft and pushing it out in sequence. 2. The earth retaining method according to claim 1, wherein the upper opening of the earth retaining frame structure is closed with a lining plate to form a working gantry. 3. The earth retaining method according to claim 1, wherein the earth retaining panel is made of a panel material such as a sheet pile. A driving jack is interposed between the leading earth retaining frame structure and the succeeding earth retaining frame structure, and between the succeeding earth retaining frame structures, and the driving jack moves the leading earth retaining frame structure and the succeeding earth retaining frame structure. The earth retaining method according to any one of claims 1 to 3, wherein the frame structure is extruded sequentially.

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