JPH084004A - Method of demolishing cut beam for retaining earth - Google Patents

Abstract

PURPOSE:To demolish cut beams efficiently with a minimum of work scaffold by setting up a scaffold for demolishing under one end of cut beams, and sliding the cut beams in order and pulling them into the side of scaffold, and removing them one section by one section. CONSTITUTION:A shelf pile 6 for supporting cut beams to be demolished and a cut beam orthogonal to the cut beam 5 are provided with a slide plate for guiding longitudinal sliding and a slip preventive member in advance or at breakup. Next, under one end side of the cut beam 5 is a scaffold 18 for breakup assembled so that it may surround the shelf pile 6 supporting two sections of beam steels 5a (5a1-5a5) on one end side and that it may be positioned below the oil jack between beam members. Next, coupling members for beam steels 5a for the first section and the second section on the scaffold for breakup are removed, and the first section is dismantled. Subsequently, angle brace members at both ends of the cut beam 5 are dismantled, whereby the longitudinal shifting of the cut beams 5 is made possible. Hereafter, the cut beam 5 for shifting to the second section is drawn into the side of the scaffold 18 by sliding, and the beam steel members 5a for every section are dismantled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for disassembling a beam for a mountain retaining frame.

[0002]

2. Description of the Related Art As shown in FIGS. 14 and 15, for example, in the excavation portion 1 formed by excavating the ground to a predetermined depth in order to construct a basement portion of a building structure, surrounding ground is formed. Mountain retaining work is carried out to prevent it from collapsing. In this mountain retaining work, a plurality of sheet piles or the like are brought into contact with the ground wall 1a to form the mountain retaining wall 2, and the waving material 3 is arranged horizontally along the wall surface of the mountain retaining wall 2. Then, between the abutment walls 3 of the mountain retaining walls 2 and 2 facing each other, the cross beams 5 extending horizontally in the upper direction in the excavation section 1 via the fired material 4 are vertically and horizontally installed, and each mountain retaining wall is formed. The structure is designed to resist the earth pressure applied to 2. And each of the erected beams 5 ...
, A plurality of shelf piles 6 are erected on the ground in the excavation unit 1.

Here, each cutting beam 5 is composed of a plurality of H-shaped beams 5a ₁ , 5a ₂ ... Connected in a node shape, and each connecting portion 5b ₁ to which the ends in the longitudinal direction are connected. 5b
_2, a joint plate for bolting the webs at the abutting positions and the flanges to each other is arranged, or an oil jack covered with a cover plate is arranged.

[0004]

Then, at the stage of constructing the basement portion of the building structure, the mountain retaining members arranged in the excavating section 1 are disassembled, but the cutting beams 5 ... Excavate. Since it is installed above the part 1, it is likely to be performed at high places, which is dangerous. Therefore, when the dismantling work of the cutting beams 5 is performed, the dismantling scaffolding is erected over the entire area of the excavation portion 1 so that the entire area directly below the cutting beams 5 serves as a work floor.

As described above, when dismantling scaffolds are erected all over the excavation part 1, a great deal of labor and materials are required for assembling and dismantling the scaffolds, and there is a problem in terms of work time and work cost for dismantling the cutting beams. There is. The present invention has been made in view of the above circumstances, and for mountain retaining that enables efficient dismantling of a cutting beam while constructing a minimum required work scaffold using a scaffold or the like used for building a structure. It is intended to provide a method for dismantling a beam.

[0006]

According to the method of disassembling a mountain beam for cutting a mountain according to a first aspect of the present invention, a plurality of shelf piles standing upright at a predetermined interval in an excavating portion face each other while supporting each other. A dismantling method that disassembles a cut beam made of multiple steel beams that are laid vertically and horizontally above the mountain retaining walls and connected in a node shape via connecting members while removing the beam steel materials for each node. is there.

First, is it necessary to previously attach a guide member for guiding the sliding movement of the cut beam to be disassembled to the shelf pile supporting the cut beam to be disassembled and the cut beam orthogonal to the cut beam? , Or an oil which is attached to the guide member at the time of disassembling and encloses a shelf pile supporting at least one end side two-section steel beam below one end side of the cut beam and is connected between the steel beams. A scaffolding assembly process is performed to assemble the dismantling scaffolding so that it is located below the jack.

Next, the oil jack is loosened on the dismantling scaffold, and at the same time, the striking material at both ends of the cutting beam connected to the mountain retaining wall can be removed to move the cutting beam in the longitudinal direction. Perform the setup process. Then, the oil jack is removed, and a first removing step is performed to remove the connecting member of the beam steel material at the first and second joints on the dismantling scaffold and remove the first joint.

Next, the cutting beams after the second joint are guided by the guide member and slid into the scaffolding for dismantling, and the connecting members of the steel beams at the second and third joints are removed to remove the second joint. Perform the second removal step. Similarly, the cut beams after the third joint are also pulled in toward the dismantling scaffolding side by sliding, and the beam steel material for each joint is removed.

According to a second aspect of the present invention, there is provided a method for disassembling a mountain beam for a mountain retaining member, wherein one end portion of the mountain beam is attached to a connecting position of the mountain retaining wall on one end side which is coupled with the fired material. A holding member for holding is arranged, and when the cutting beam composed of the final two-section beam member is slid into the scaffolding for dismantling by sliding movement, the holding member holds the beam member on one end side of the cutting beam. The method is characterized by

The method for disassembling a mountain beam for a mountain retaining structure according to a third aspect is the method for disassembling a mountain beam according to the first or the second aspect, in which a scaffold for disassembling is adjacent to a first beam having a scaffold for disassembling. Remove the flint material at both ends of the second cutting beam and move the second cutting beam in parallel along the first cutting beam, and then dismantle the second cutting beam after dismantling the first cutting beam. It is a method characterized by going.

Further, the method for disassembling a mountain beam for a mountain retaining structure according to a fourth aspect is the method for disassembling a mountain beam according to the first to third aspects, wherein the guide member provided on the shelf pile is projected from the shelf pile. A slide plate that is integrated with a receiving bracket and has a downward slope from the receiving surface of the bracket toward the rear side in the sliding movement direction of the cutting beam, and the receiving surface of the bracket from the side surface of the shelf pile to the cutting beam. And a deviation prevention member provided at a position separated by substantially the same distance as the width dimension of the.

Further, in the method for disassembling the mountain beam for cut-off according to claim 5, in the method according to any one of claims 1 to 4, the guide member provided on the cross-beam orthogonal to the cross-beam to be disassembled is cut orthogonally. A slide plate which is integrated with the beam and is inclined downward from the upper surface of the orthogonal cutting beam toward the rear side in the sliding movement direction of the cutting beam to be disassembled, and disassembled on the upper surface of the orthogonal cutting beam. It is composed of a pair of cutting beam displacement prevention members provided at positions separated by the same width as the width dimension of the cutting beam.

[0014]

According to the method of disassembling a mountain beam for a mountain retaining member according to the first aspect of the present invention, the scaffold for disassembling surrounds the beam steel materials of the first and second joints below the beam to be disassembled, and the space between the beam steel materials. It is arranged so that it is located below the oil jack that is connected to, and while sliding the cutting beam to the scaffolding side for dismantling, it is a method of sequentially removing the beam steel material for each joint, so Compared with this, the construction area of the dismantling scaffolding is significantly reduced. Therefore, the work cost is reduced, and the time spent on the dismantling work is significantly reduced.

According to the method for disassembling a mountain beam for a mountain beam according to a second aspect of the present invention, in addition to the function of the first aspect, even if the beam to be dismantled becomes a beam steel material of the last two sections, a fired material is used. By engaging one end portion of the cutting beam with the holding member arranged at the connection position of the mountain retaining wall on the one end side that was connected to the work piece, it is possible to perform work safely and reliably while preventing falling.

Further, according to the method for disassembling a mountain beam for a mountain retaining rod according to a third aspect, in addition to the actions according to the first and second aspects, at least two disassembling beam members can be continuously disassembled. , It becomes possible to dismantle the cutting beam efficiently while constructing the minimum required scaffold for dismantling. Further, according to the method for disassembling the mountain beam for gluing according to claims 4 and 5,
Since the joint plates and the like arranged at the connecting portions of the steel beams constituting the cut beam move while slidingly contacting the upper surface of the slide plate, the cut beam is a bracket provided on a shelf pile or a cut beam orthogonal to each other. Go over the top smoothly. Further, the shelves to be disassembled are slid while the movement in the width direction is corrected by the shelving piles and the shift prevention members provided on the shelves orthogonal to the shelves to be disassembled.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method of disassembling the mountain beam for cut-out according to the present invention will be described below with reference to the drawings. Note that FIG.
Also, the same components as those shown in FIG. 15 are designated by the same reference numerals and the description thereof will be omitted. 1 to 4 are views showing a slide plate and a shift preventing member used at the time of disassembly of the present embodiment.

That is, as shown in FIG. 1 and FIG.
A bracket 12 made of an angle member that abuts the bottom surface of the cutting beam 5 to support the cutting beam 5 from below is horizontally provided on the flange 6a of each shelf pile 6 made of shaped steel. The slide plate 10 is connected to the outside of the bent portion of the bracket 12 by bolt joining, and the connecting portion 10a that is connected to the bracket 12 by a bolt and the connecting portion 10a are integrated with each other.
And an inclined portion 10b that is inclined downward as it is separated from the bracket 12 in the extending direction.

In the upper plate 12a of the bracket 12 with which the bottom surface of the cutting beam 5 abuts, the distance from the shelf pile 6 is set to be substantially the same as the flange width of the cutting beam 4, and the cutting beam 4
The block-shaped shift prevention member 11 set to a height of about ½ of the height is fixed. Further, as shown in FIGS. 3 and 4, a cut beam 5T orthogonal to the cut beam 5 to be disassembled
Also, the slide plate 15 and the deviation prevention member 17 are provided.

The slide plate 15 is provided in an orthogonal portion of the cut beam 5T orthogonal to the cut beam 5 to be disassembled, and is bolted to the upper flange 5T ₁ of the cut beam 5T.
The cut beams 5 are arranged so as to be inclined downward as they are separated from the cut beams 5T in the extending direction. Further, the shift preventing members 17 are arranged at positions spaced apart from each other by substantially the same width as the flange width of the cross beam 5 so as to project from the upper surface of the upper flange 5T ₁ and fix the slide plate 15. It is composed of a bolt 17a.

As a result, at the time of disassembling the cutting beam according to the present embodiment, even if the cutting beam 5 moves in the horizontal direction in the direction of the arrow in FIGS. 2 and 4, the connecting portions 5b ₁ and 5b _{2 of} each cutting beam 5 are moved.
Since the joint plate and the cover plate of the oil jack that are provided on the slide plate move while sliding the slide plates 10 and 15, the cut beam 5 includes the cut beam 5T orthogonal to the bracket 12 and the cut beam 5 to be disassembled. It is possible to get over smoothly.

Further, since the moving cutting beam 5 passes between the shelf pile 6 and the deviation preventing member 11 and also between the deviation preventing members 17 provided on the cutting beam 5T, the width at the time of movement The deviation of the direction is prevented. Next, FIG.
From now on, referring to FIG. 12, a method of disassembling the beam of this embodiment will be explained. Here, for simplification of the drawing, a cut beam 5T orthogonal to the cut beam 5 to be disassembled is not shown. In addition,
In these figures, reference numerals 15a, 15b and 15c are
It is a part of the constructed basement skeleton, and reference numeral 16 is a work scaffold for the skeleton.

First, the slide plate 10 and the displacement preventing member 11 are sequentially provided on the brackets 12 of the shelving piles 6 supporting the cutting beams 5 to be disassembled, or in advance.
The slide plate 10 and the slip prevention member 11 are attached to the brackets 12 of the shelf piles 6 ... Next, as shown in FIG. 5, the H-shaped beam (beam steel material) 5a _{1 at the first} node and the H-shaped beam 5a _{2 at the second} node on the one end side are provided at the lower position on the one end side of the cut beam 5.
Surrounding the shelf piles 6, 6 supporting the H-shaped beams 5a ₁ ,
Oil jack connected between 5a ₂ (not shown)
The dismantling scaffold 18 is assembled so that the scaffold 18 is located at a lower position.

Next, the work of loosening the oil jack is performed on the dismantling scaffold 18, and between the both ends of the waving material 3 arranged along the wall surface of the mountain retaining wall 2 and the erected beam 5. The fired material 4 connected to is lifted by a crane and removed from the excavation section 1. Then
Remove the oil jack. Next, as shown in FIG. 6, after the suspension wire 22 is engaged with the H-shaped beam 5a ₁ of the _first joint, the suspension wire 22 is engaged with the hook portion 20 of the crane, and then the scaffold 18 for dismantling 1 The connecting member (oil jack and cover plate) of the connecting portion 5b ₁ between the H-shaped beam 5a ₁ of the node and the H-shaped beam 5a _{2 of the second} node is removed. Then, the first section H-shaped beam 5a ₁ is lifted by a crane and removed from the excavation section 1.

Next, as shown in FIG. 7, the cutting beam 5 to which the H-shaped beam 5a _{2 and the} subsequent ones of the second node are connected is removed by using a retracting device such as a winch or a chain block. It is drawn toward the H-shaped beam 5a ₁ side (in the direction of the arrow shown in FIG. 7). At this time, the joint plates arranged at the connecting portions 5b ₂ , 5b ₃ , 5b ₄ of the beam 5 move while sliding on the slide plates 10 and 15 shown in FIGS. 1 to 4. Therefore, the slidably moving cutting beam 5 smoothly crosses over the bracket 12 and the orthogonal cutting beam 5T. Further, since the sliding beam 5 moves while being restrained by the preventing members 11 and 17, the widthwise deviation is prevented and there is no risk of dropping.

Next, as shown in FIG. 8, the suspension wire 22 is engaged with the H-shaped beam 5a ₂ of the _second joint, and the suspension wire 22 is engaged with the hook portion 20 of the crane, and then the dismantling scaffold 1
On 8, the connecting member (splice plate) of the connecting portion 5b ₂ between the H-shaped beam 5a _{2 at the second} node and the H-shaped beam 5a _{3 at the third} node is removed. Then, with the crane,
The mold beam 5a ₂ is lifted and removed from the excavation part 1.

Next, as shown in FIG. 9, the cutting beam 5 to which the H-shaped beam 5a _{2 and the} subsequent ones of the second section are connected is pulled in the direction of the arrow using a pulling device such as a winch or a chain block. At this time, similarly to the sliding movement shown in FIG. 7, the sliding cutting beam 5 smoothly crosses over the bracket 12 and the orthogonal cutting beams 5T,
Misalignment in the width direction is prevented.

Next, as shown in FIG.
The hanging wire 22 is engaged with the beam 5a ₃ to
After engaging with the hook part 20 of the crane, on the dismantling scaffolding 18, the H-shaped beam 5a _{3 at the} 3rd node and the H-shaped beam at the 4th node
The connecting member of the connecting portion 5b ₃ between the beam members 5a ₄ is removed. Then, the H-shaped beam 5a ₃ at the _third joint is lifted by a crane and removed from the excavation section 1.

Next, as shown in FIG.
At the stage where the beams 5a ₄ and 5a ₅ have been formed, the holding member 26 capable of holding the end portion of the cut beam 5 is connected to the bellows raising member 3 located on the disassembly scaffolding 18 side. Then, these H-shaped beams 5a ₄ and 5a ₅ are drawn in the direction of the arrow using a drawing device such as a winch or a chain block. At this time, similarly to the sliding movement shown in FIGS. 7 and 9, the cutting beam 5 composed of the H-shaped beams 5a ₄ and 5a ₅ smoothly crosses over the bracket 12 and the orthogonal cutting beam 5T, and The beam 5 is prevented from shifting in the width direction.

Then, as shown in FIG. 13, the hanging wires 22 are engaged with the H-shaped beams 5a ₄ and 5a ₅ whose ends are held by the holding members 26, and these hanging wires 22 are hooked on the crane. Scaffolding 1 for dismantling after engaging with part 20
On 8, the connecting member of the connecting portion 5b ₄ is removed. Then, the H-shaped beams 5a ₄ and 5a ₅ are lifted by a crane and removed from the excavation unit 1.

According to the above-mentioned method of dismantling the cut beam, the dismantling scaffold 18 is installed below the cut beam 5 to be disassembled so as to surround the H-shaped piles 5a ₁ and 5a ₂ at the _first and second nodes, This is a method of sequentially removing the H-shaped beam for each joint while sliding the cutting beam 5 to the side of the scaffolding 18 for dismantling, and thus efficiently dismantling the cutting beam 5 while constructing the minimum required scaffolding 18 for dismantling. As a result, it is possible to significantly reduce the time spent on the dismantling work while reducing the working cost as compared with the conventional dismantling method.

Further, the slide plate 10 for guiding the movement of the cutting beam 5 in the longitudinal direction (sliding direction) to the shelf piles 6 supporting the cutting beam 5 to be disassembled and the shift preventing member 1.
1 is arranged, and the slide plate 15 and the deviation preventing member 17 are also arranged on the cut beams 5T orthogonal to each other. Therefore, the joint plates of the connecting portions 5b ₁ , 5b ₂ ... Of the H-shaped beams 5a ₁ ... The sliding beam 5 moves while sliding on the slide plates 10 and 15 to move the cutting beam 5 to the bracket 12 and the cutting beam 5 orthogonal to each other.
Since T can be smoothly passed over and the movement in the width direction is restrained by the deviation preventing members 11 and 17, the deviation of the cutting beam 5 in the width direction can be prevented.

Further, the H-shaped beams 5a ₄ and 5a _{5 of the} last section 2
At this stage, the holding member 26 capable of holding the end of the cutting beam 5 is connected to the bellows raising member 3 located on the side of the dismantling scaffold 18, so that the H held by the holding member 26 is held. It is possible to reliably remove the beam 5a ₄ to the outside of the excavation part 1 while preventing the beam 5a ₄ from falling. Further, FIG. 13 shows a plan view of the excavation part 1 showing another embodiment of the present invention.

In this embodiment, the cutting beam 5A adjacent to the cutting beam 5 to be disassembled is translated to above the dismantling scaffold 18, and after the disassembling operation of the cutting beam 5 shown in FIGS. 5 to 12. This is a method of dismantling the cutting beam 5A. According to this method, it is possible to continuously perform the disassembly work of the two beams, so that it is possible to efficiently disassemble the beams 5 while constructing the minimum required disassembly scaffold 18.

[0035]

As described above, according to the first aspect of the present invention.
The dismantling method of the mountain beam for the mountain retaining structure described above is such that the dismantling scaffold surrounds the beam steel materials of the first and second nodes below the beam to be disassembled, and is located below the oil jack connected between the beam steel materials. It is a method to remove the beam steel material for each section one by one while sliding the cutting beam toward the dismantling scaffold side, so compared to the conventional dismantling method, the construction area of the dismantling scaffolding Can be reduced to reduce the work cost, and the time spent for dismantling work can be significantly shortened.

Further, in addition to the effect of claim 1, the method of disassembling a mountain joisting sill of claim 2 has the effect that, even if the severing girder to be dismantled becomes the beam steel material of the final 2 sections, it is connected to the fire-punched material. By engaging the one end portion of the cut beam with the holding member arranged at the connecting position of the mountain retaining wall on the one end side, it is possible to perform the work safely and reliably while preventing the steel beam material from falling. Further, in addition to the effects of claims 1 and 2, the method of disassembling a mountain beam retaining cut beam according to claim 3 can perform at least two cutting beam disassembling operations in a continuous manner, and thus is a minimum required. It is possible to more efficiently dismantle the beams while constructing the dismantling scaffold.

Further, in the method for disassembling a mountain beam for a mountain beam according to claims 4 and 5, a joint plate or the like arranged at the connecting portion of each beam steel material constituting the mountain beam is slidably brought into contact with the upper surface of the slide plate. Since the vehicle moves while moving, it is possible for the cutting beam to smoothly get over the bracket provided on the shelf pile and the cutting beam intersecting at right angles. Further, the shelving pile and the misalignment prevention member arranged on the cross beam orthogonal to the cross beam to be disassembled allow the disassembled cross beam to be normally slid and moved without causing a deviation in the width direction. .

[Brief description of drawings]

FIG. 1 is a perspective view showing a slide plate provided on a shelf pile according to the present invention.

FIG. 2 is a front view showing a shift preventing member provided on the shelf pile according to the present invention.

FIG. 3 is a perspective view showing a slide plate provided on a beam of the present invention.

FIG. 4 is a front view showing a shift preventing member provided on the beam of the present invention.

FIG. 5 is a diagram showing a setup process according to the present invention.

FIG. 6 is a view showing a state in which the beam steel material of the first knot according to the present invention is removed.

FIG. 7 is a diagram showing a first sliding movement according to the present invention.

FIG. 8 is a view showing a state in which the beam steel material of the second joint according to the present invention is removed.

FIG. 9 is a diagram showing a second slide movement according to the present invention.

FIG. 10 is a view showing a state in which the beam steel material at the third joint according to the present invention is removed.

FIG. 11 is a diagram showing a third slide movement according to the present invention.

FIG. 12 is a diagram showing a final dismantling method of the present invention.

FIG. 13 is a plan view showing a second embodiment of the present invention.

FIG. 14 is a view showing a mountain retaining frame arranged in the excavation section.

FIG. 15 is a plan view showing a mountain retaining frame arranged in the excavation section.

[Explanation of symbols]

1 excavation part 2 mountain retaining wall 4 fired material 5a ₁ , 5a ₂ , 5a ₃ , 5a ₄ beam steel material 5b ₁ , 5b ₂ , 5b ₃ , 5b ₄ connection part 5, 5A, 5T cutting beam 6 shelf pile 10, 15 slide plate (Guiding member) 11, 17 Misalignment preventing member (Guiding member) 12 Bracket 18 Scaffold for disassembly 26 Holding member

Claims (5)

[Claims] 1. While being supported by a plurality of shelf piles standing upright at a predetermined interval in the excavation portion, the piles are vertically and horizontally installed above the opposing mountain retaining walls, and are connected in a node shape through a connecting member. A method of dismantling a cut beam for mountain retaining, in which a beam made of a plurality of beam steels is disassembled while removing the beam steel for each section. A guide member for guiding sliding movement of the cut beam to be disassembled in the longitudinal direction is attached to the cut beam orthogonal to the beam in advance, or the guide member is attached at the time of disassembly, and one end of the cut beam is attached. A scaffold for assembling a dismantling scaffold so that it surrounds a shelf pile supporting at least one end bar steel beam at one end side and is located below an oil jack connected between the beam steel members below the side. Perform the assembly process, then While performing the loosening work of the oil jack on the scaffold for dismantling, a setup process is performed to remove the flint material at both ends of the cutting beam that is connected to the mountain retaining wall to enable movement of the cutting beam in the longitudinal direction. Then, the oil jack is removed, and a first removing step of removing the connecting member of the beam steel material at the first and second joints on the dismantling scaffold is performed to remove the first joint, and then the second and subsequent joints. Performing the second removal step of pulling the cutting beam of No. 2 by sliding movement to the side of the scaffolding for dismantling while guiding by the guide member and removing the connecting member of the beam steel material at the second and third nodes and removing the second node, Hereinafter, a method for disassembling a mountain beam for a mountain retaining, characterized in that the beams after the third joint are also pulled in toward the scaffolding for dismantling by sliding to remove the beam steel material at each node. 2. The method for disassembling a mountain beam for a mountain beam according to claim 1, wherein a retaining member for retaining one end portion of the mountain beam is arranged at a connecting position of the mountain retaining wall on one end side which was connected to the fire striking material. In addition, when the cutting beam composed of the beam members of the last two sections is pulled in to the scaffolding side for disassembly by sliding movement, the beam member on one end side of the cutting beam is held by the holding member. Method of dismantling a beam. 3. The method for disassembling a mountain joisting cut beam according to claim 1 or 2, wherein a second joist beam adjacent to the first joist beam having a dismantling scaffold assembled under one end thereof is provided. For mountain retaining, characterized in that the flint material at both ends is removed, the parallel movement is performed along the first cutting beam, and the second cutting beam is dismantled after the dismantling work of the first cutting beam. Method of dismantling a beam. 4. The method for disassembling a mountain joisting cut beam according to claim 1, wherein a guide member provided on the shelf pile is integrated with a cutting beam receiving bracket projecting from the shelf pile, The slide plate inclined downward from the receiving surface of the bracket toward the rear side in the sliding movement direction of the cutting beam, and the receiving surface of the bracket at the same distance as the width dimension of the cutting beam from the side surface of the shelf pile. A method of disassembling a mountain beam for gluing, comprising a shift prevention member provided at a separated position. 5. The method for disassembling a mountain beam for cutting a mountain according to any one of claims 1 to 4, wherein a guide member provided on the beam that is orthogonal to the beam to be disassembled is integrated with the orthogonal beam. The same as the width dimension of the cut beam to be disassembled on the slide plate inclined downward from the upper surface of the cut beam toward the rear side in the sliding movement direction of the cut beam to be disassembled, and on the upper surface of the orthogonal cut beam. A method of disassembling a mountain beam for use in mountain fastening, comprising a pair of beam retaining members provided at positions separated by a length.