JP6434372B2 - Removal method of existing structures - Google Patents

Description

  The present invention relates to a method for removing an existing structure when an obstacle such as an existing structure at a construction crossing is removed and the existing structure is replaced with a new structure having a large width.

  When it is necessary to renovate an underground passage that has been installed under the rail so as to cross the rail for many years, the conventional construction method first puts support piles on both sides of the underground passage and at night. After removing the ground below the rail on the underpass, laying the rail between the upper ends of the support piles and temporarily receiving it with a supported girder, destroying the existing subway and building a new underpass To be done.

  However, according to such an underpass renovation method, the rail is provisionally received with a provisional girder (construction girder), but it cannot be constructed without a covering that can install a provisional girder between the rail and the upper floor of the underground passage, In addition, since a temporary girder is installed, there is a problem that when the train passes through the construction site, it must be slowed down.

  Furthermore, it takes a lot of time to construct the temporary girder and destroy the existing underground passage, and the construction period becomes remarkably long.

The following Patent Document 1 is proposed that the train does not need to slow down because no provisional girder or the like is required as in the prior art.
Japanese Patent Publication No. 06-105025

  This patent document 1 is composed of an upper floor and a side wall, and in an existing structure where at least an edge between the upper floor and the side wall is cut, a plurality of steel plates are laid in parallel in the length direction of the existing structure on at least the upper floor At the same time, the ends of these steel plates are fixed in a fixed position, and the rear end of the existing structure is followed by the front end of the ready-made structure in a state where the top ends thereof coincide with each other. The existing structure and the ready-made structure are replaced by advancing the ready-made structure together with the upper floor of the existing structure while using the lower surface of the parallel steel plates as a guide surface while being removed by an appropriate means such as destruction.

  At this time, prior to the promotion of the prefabricated structure, the prefabricated structure is propelled while propelling the prefabricated structure while removing both side walls of the existing structure and the lower floor by an appropriate means such as destruction. The temporary floor cart supporting the upper floor of the structure is advanced on the rail laid on the lower floor, and the upper floor is pushed out to the arrival side.

  In Patent Document 1, it is necessary to tear down an existing structure existing in a crossing portion with a crossing face, and it is necessary to remove heavy objects in a narrow portion, resulting in a significant reduction in construction speed.

  An object of the present invention is to provide a method for removing an existing structure that eliminates the inconveniences of the conventional example, can safely remove the existing structure, and can improve the construction speed and the like.

In order to achieve the above object, the present invention removes the existing structure from the existing structure and constructs a new structure. Is installed through the entire length of the shaft so as to surround the outside of the existing structure, and a box for the new structure is built on the starting side, and this box is integrated with the box roof and the internal ground. By pushing to the arrival side , the existing structure surrounded by this box-shaped roof row is pushed out to the arrival side together with the surrounding natural ground surrounding it , disassembled, and the space after the extrusion is filled with the new structure Is a summary.

According to the present invention, it is possible to reduce the construction cost by omitting the time required for removing the existing structure at the crossing face face (shortening the work period) and to remove the existing structure at the arrival side light part as compared with the conventional case. Therefore, safety can be improved. In addition, by separating the punched portion and the remaining portion, it is possible to reduce the amount of inner air filling.

  As described above, the method for removing an existing structure according to the present invention is to remove the existing structure from the existing structure and construct a new structure in which the existing structure is widened. Can be removed safely and quickly, and the construction speed and the like can be improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 7 are longitudinal side views of respective steps showing one embodiment of the method for removing an existing structure of the present invention, and FIGS. 8 to 14 are front views of the same.

  In the figure, reference numeral 1 denotes an existing structure. The upper and lower slabs 1a and 1c having a constant width and a constant thickness over the entire length, and the upper and lower end surfaces are integrally formed on the lower surfaces of both upper and lower floor slabs 1a and 1c. Is a concrete structure having a rectangular cross section composed of both side walls 1b and 1b having a constant height, and is not shown in the figure, but this existing structure 1 is crossed under the rail or under the passage. It is built in the ground below this rail.

  The existing structure 1 is widened by replacing the existing structure 1 with a new structure having a horizontal box 2 made of a concrete structure having a height different from that of the existing structure 1 and having a lateral width larger than that of the existing structure 1. In some cases, the existing structure 1 is completely removed and a new structure is constructed.

  As shown in FIG. 2, the temporary earth retaining member 21 is installed with a sheet pile or the like, with the side where the box 2 follows the existing structure 1 as the start side 4 and the side where the existing structure 1 is pushed out as the arrival side 5. . (See FIG. 2) In this case, the start side 4 and the arrival side 5 are rooted and dug down 24, and a ground enough to insert a box-shaped roof 7 described below is secured below the existing structure 1.

  A box-shaped roof (steel roof with a rectangular cross section 1,000 × 1,000) 7 is inserted so as to penetrate the entire length between the start side 4 and the arrival side 5 (between the temporary earth retaining members 21). Enclose the outside of the existing structure 1 with.

  A thin steel plate 6 that is a friction cut member is stacked on the box-shaped roof 7. The steel plate 6 is intended to reduce the frictional resistance during the promotion or towing of the box 2 and to cut the edge with the surrounding ground.

  As shown in FIGS. 15 to 18, the box-shaped roof 7 is installed in a parallel manner in which a plurality of rectangular steel box-shaped roofs 7 on which steel plates 6 are placed are placed in a parallel state and connected in a lateral direction. A box-shaped roof is formed, and a plurality of steel box-shaped roofs 7 having the same size and the same shape as the box-shaped roof 7 are formed downward from both side ends of the parallel-shaped box-shaped roofs 7. 7 are placed in parallel in the longitudinal direction with the steel plates 6 placed on the outer side facing outward, thereby forming a parallel box roof stacked in a line.

  The front end of the steel plate 6 is detachably fixed to the tip of the box-shaped roof 7, and an auger (not shown) is inserted into the box-shaped roof 7 in order to drive each box-shaped roof 7 into the ground. Alternatively, it is carried out by propelling the front ground from the arrival side 5 toward the start side 4 while excavating the ground in front by the manual operation of an operator arranged in the box roof 7.

  In the illustrated example, the box-shaped roof 7 is inserted from the arrival side 5 toward the departure side 4, but conversely, it may be inserted from the departure side 4 toward the arrival side 5.

  The front ends of these parallel box-shaped roofs 7 are protruded to the starting side 4, and the front ends of all the steel plates 6 on the parallel box-shaped roofs 7 are separated from the box-shaped roofs 7, and these are aligned in a row. The front ends of all the steel plates 6 and the front ends of all the steel plates 6 arranged in the longitudinal direction are in close contact with and supported by the side surfaces of the ground from which these steel plates 6 protrude by welding or the like. On the arrival side 5, all the steel plates 6 projecting rearward are connected to each other by connecting members (not shown) made of H-section steel or the like arranged orthogonally on these steel plates 6. 6 are connected together by fixing by welding or the like.

  Note that the operation of separating the front end of the steel plate 6 from the box-shaped roof 7 and the operation of fixing the end may be performed at any time before the replacement of the existing structure 1 and the box 2 is started.

Next, as shown in FIGS. 4 to 6, the box 2 is built in the pit on the start side 4, and the box is propelled to the arrival side 5 integrally with the box-shaped roof 7 and the internal ground mountain 22. Then, the existing structure surrounded by the box-shaped roof row 7 is pushed out to the arrival side 5 together with the internal ground mountain 22 surrounding the periphery.

Thereby, the existing structure 1 is not excavated in the tunnel, but is pushed out to the arrival side 5 and replaced with the box 2. That is, the box-shaped roof 7, the inner ground 22, and the space after the existing structure 1 is pushed out are supplemented with the box 2 as a new structure.

  In the figure, reference numeral 23 denotes a pusher provided on the front surface of the box 2.

  The inner ground mountain 22 of the construction section is in a state in which the box roof 7 is vertically and horizontally left and both the starting and reaching end portions are constrained by the temporary earth retaining member 21 of the vertical shaft. The temporary earth retaining member 21 is box-shaped. The mirror is cut in accordance with the roof 7, and the portion between the box-shaped roof 7 and the existing structure 1 is used as the moving earth retaining member 21a.

  Although not shown in the figure, the box 2 is pushed out by providing a reaction force receiving wall in the pit on the starting side 4 and installing a plurality of propulsion jacks on the front surface of the reaction force receiving wall, and interposing struts as necessary. To do.

  The box-shaped roof 7 pushed out to the vertical shaft on the arrival side 5 is collected and the earth ground 22 is discharged.

  Further, the existing structure 1 pushed out to the arrival side 5 is destroyed and removed.

It is a vertical side view of the 1st process which shows one Embodiment of the removal construction method of the existing structure of this invention. It is a vertical side view of the 2nd process which shows one Embodiment of the removal construction method of the existing structure of this invention. It is a vertical side view of the 3rd process which shows one Embodiment of the removal construction method of the existing structure of this invention. It is a vertical side view of the 4th process which shows one Embodiment of the removal construction method of the existing structure of this invention. It is a vertical side view of the 5th process which shows one Embodiment of the removal construction method of the existing structure of this invention. It is a vertical side view of the 6th process which shows one Embodiment of the removal construction method of the existing structure of this invention. It is a vertical side view of the 7th process which shows one Embodiment of the removal construction method of the existing structure of this invention. It is a front view of the 1st process which shows one Embodiment of the removal construction method of the existing structure of this invention. It is a front view of the 2nd process which shows one Embodiment of the removal construction method of the existing structure of this invention. It is a front view of the 3rd process which shows one Embodiment of the removal construction method of the existing structure of the present invention. It is a front view of the 4th process which shows one Embodiment of the removal construction method of the existing structure of this invention. It is a front view of the 5th process which shows one Embodiment of the removal construction method of the existing structure of this invention. It is a front view of the 6th process which shows one Embodiment of the removal construction method of the existing structure of this invention. It is a front view of the 7th process which shows one embodiment of the removal construction method of the existing structure of the present invention. It is explanatory drawing of the 1st process which shows the installation method of a box-shaped roof. It is explanatory drawing of the 2nd process which shows the installation method of a box-shaped roof. It is explanatory drawing of the 3rd process which shows the installation method of a box-shaped roof. It is explanatory drawing of the 4th process which shows the installation method of a box-shaped roof.

DESCRIPTION OF SYMBOLS 1 Existing structure 1a Upper floor slab 1b Side wall 1c Lower floor slab 2 Box 3 Rail 4 Starting side 5 Arrival side 6 Steel plate 7 Box-shaped roof 19 Reaction force receiving wall 20 Filler 21 Temporary earth retaining member 21a Moving earth retaining member 22 Inner natural ground 23 Press corner work 24

Claims (1)

When removing this existing structure from the existing structure and constructing a new structure, the box-shaped roof should surround the outside of the existing structure from the vertical shafts installed on both sides as protective work in the construction section. This box shape is installed by penetrating the entire length between the shafts , constructing a box for the new structure on the starting side, and propelling this box to the arrival side as a unit with the box roof and internal ground . A method for removing an existing structure characterized in that an existing structure surrounded by a roof row is pushed out to the destination side along with an internal ground surrounding the roof, disassembled, and the space after the extrusion is filled with a new structure.

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