JPH10121500A - Construction method of outer peripheral beam of basement floor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To certainly support an outer peripheral beam by eliminating a reversely driven support to be driven in the neighbourhood of an earth retaining wall by supporting the outer peripheral beam by the earth retaining wall. SOLUTION: A construction method of an outer peripheral beam of a basement floor is to integrally and projectively provide a first frame 24 formed on an H section by welding 26 on an inner surface of a main pile 10 of an earth retaining wall 14. An installation plate fastened on a lower and end of a ground pillar 28 is integrally connected to the first frame 24 by welding 30, and a general beam 20 and an outer peripheral beam 22 are connected to this ground pillar 28. A second frame 36 formed of the H section is projectively provided by welding from an inner surface of the main pile 10 on a general part of the outer peripheral beam 22. A lower flange 22c of the outer peripheral beam 22 is directly paced on the second frame 36, and these second frame 36 and outer peripheral beam 22 are welded together.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a perimeter beam constructed along the inside of a retaining wall when constructing an underground floor by a reverse striking method.

[0002]

2. Description of the Related Art In recent years, when constructing an underground floor, a back strut is laid in the underground part, and then the ground is excavated to expose the strut. A beam is sequentially applied to the exposed strut from the upper floor. There is a reverse striking method in which a floor surface is constructed by connecting the floor surfaces, and the constructed floor surface is further used as a shoring support to construct an underground portion (see Japanese Patent Publication No. 3-79491).

[0003] In such a reverse striking method, a mountain retaining wall is constructed in advance at a peripheral portion of an area where a basement floor is to be constructed, and the reverse strut is cast inside the mountain retaining wall. Then, after the ground is primarily excavated, the respective back struts are connected by beams, and an outer peripheral beam is constructed along the inside of the retaining wall, and a floor surface is constructed across the upper side of the beams. It has become.

[0004]

However, when the outer strut constructed along the inner periphery of the retaining wall is supported by the reverse strut, as shown in FIG. Need to be cast. By the way, back strut 1
The lower end portion is driven into a foundation pile 5 which is driven into a foundation portion of an underground frame. For this reason, even when the reverse strut 1 is driven near the inside of the retaining wall 2, it is necessary to drive the foundation pile 5 near the retaining wall 2.
At this time, it is necessary to make the diameter of the foundation pile 5 sufficiently larger than that of the back strut 1 so that the back strut 1 is reliably driven into the foundation pile 5.

[0005] However, when the large-diameter foundation pile 5 is cast near the retaining wall 2, particularly when the foundation pile 5 is driven into the corner portion of the retaining wall 5 as shown in FIG. In order to avoid interference between the retaining wall 5 and the retaining wall 5, it is necessary to drive the retaining wall 5 slightly away from the retaining wall 5. Then, the reverse strut 1 that is driven close to the retaining wall 2
As shown in the figure, there is a possibility that the base pile 5 will not be able to be accommodated. As described above, there is a problem that the back strut 1 is not stabilized when it comes off the foundation pile 5, and the supportability of the outer strut by the back strut 1 is deteriorated.

In view of the above-mentioned problems, the present invention eliminates the use of a reverse strut installed near the retaining wall by supporting the outer peripheral beam on the retaining wall, thereby ensuring the support of the outer peripheral beam. It is an object of the present invention to provide a method of constructing a perimeter beam of a basement floor which is performed in the following manner.

[0007]

In order to achieve the above object, a method of constructing an outer beam of a basement floor according to claim 1 of the present invention comprises providing a plurality of parent piles around a basement floor to be constructed at appropriate intervals. To construct a mountain retaining wall by closing the space between these parent piles with a sheet pile, etc., and inside the mountain retaining wall,
In the reverse striking method in which the ground is excavated while constructing the beam and the floor surface in order from the upper floor to construct the underground floor, the position is located below the outer peripheral beam constructed along the inside of the retaining wall. Then, a gantry is integrally protruded from the parent pile by retrofitting, and the outer beam is constructed in a state where the outer beam is supported by the gantry.

According to a second aspect of the present invention, there is provided a method for constructing an outer peripheral beam on a basement floor, wherein a transmission means for transmitting a horizontal load acting on the gantry to the outer peripheral beam is provided between the gantry and the outer peripheral beam. . Further, in the method of constructing an outer peripheral beam of a basement floor according to claim 3 of the present invention, a column receiving gantry is provided below the gantry, and is integrally provided with the parent stake by retrofitting. The above-mentioned pillars are constructed while supporting the above-mentioned pillars arranged along the inner side of the retaining wall, and then the pillar receiving gantry is buried in the underground pillars to be constructed below the pillars.

The operation of the above-described method of constructing the outer beams on the basement floor will be described below.

[0010] In the construction method of the outer beam of the basement floor according to claim 1,
Since the outer beam is supported by the base integrally protruded from the parent pile of the retaining wall, the reverse strut connecting the outer beam can be eliminated. Therefore, it is not necessary to use a complicated device for storing the back strut on the foundation pile near the inner side of the retaining wall, so that the construction work of the outer peripheral beam is simplified and the outer peripheral beam is reliably supported.
Also, since the base is fixed to the parent pile by retrofitting,
The position accuracy of the gantry with respect to the outer peripheral beam in the height direction is improved, and the level of the outer peripheral beam is easily and accurately set. Further, by eliminating the upright strut standing upright over the entire height of the basement floor near the inner side of the retaining wall, a large work space can be secured by eliminating obstacles at the inner side of the retaining wall. Further, by increasing the support rigidity of the gantry, the gantry can support the lower end of the ground column, and the basement floor and the ground floor can be simultaneously advanced.

In the method for constructing an outer peripheral beam on a basement floor according to a second aspect of the present invention, a transmission means for transmitting a horizontal load acting on the gantry to the outer peripheral beam is provided between the pedestal and the outer peripheral beam. By the completion of the construction of the beam and the floor, a horizontal load acting on the retaining wall in the falling direction is input from the gantry to the outer peripheral beam via the transmission means, and the horizontal load is supported by the floor. This means that the retaining wall does not collapse during excavation of the lower floor.

Further, according to a third aspect of the present invention, in the method for constructing an outer peripheral beam of a basement floor, a column receiving gantry is provided below the gantry, and is integrally provided with the parent pile by retrofitting. Since the above-mentioned pillars were constructed while supporting the above-mentioned pillars arranged along the inner side of the retaining wall, and then the pillar receiving cradle was buried in the underground pillars to be constructed below the pillars. Even if the strut is abolished, the ground pillar constructed near the inner side of the retaining wall is reliably supported. For this reason,
The ground pillars can support the construction weight of the ground floor, and the construction of the basement floor and the construction of the ground floor can be performed simultaneously, so that the construction period can be shortened. In addition, since the column receiving gantry is buried in the underground column constructed in the lower part, the appearance is kept good, and the column receiving gantry alone does not protrude and does not become an obstacle.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 3 show a first embodiment of a method of constructing a perimeter beam on a basement floor according to the present invention. FIG. 1 is a sectional front view showing an attached state of a perimeter beam at a column joint portion.
FIG. 2 is a sectional plan view of the same portion, and FIG. 3 is a sectional front view showing an attached state of a general portion of the outer peripheral beam.

That is, as shown in FIGS. 1 to 3, the cross pile 12 is inserted between the flanges 10a and 10b of the parent pile 10 made of H-shaped steel, whereby the retaining wall 14 is constructed. The horizontal sheet pile 12 is in a state of being pressed against the inner flange 10 b side by earth and sand packed on the outside of the retaining wall 14. Then, the underground floor 16 is constructed while excavating the ground inside (right side in the figure) of the retaining wall 14.

On the basement floor 16, reverse struts (not shown) are laid in a grid pattern on an inward portion (not shown), and the ground is excavated from the surface after the struts are laid. First, the ground surface portion is firstly excavated to construct the floor 18 on the first floor, and then an excavating machine is carried in from the opening formed on the floor 18 to secondly excavate the first floor underground. Then, a step of constructing a floor surface 18 at the bottom of the secondary excavation and excavating the second basement portion in the same manner is repeated, and the construction is sequentially progressed to the lower floor.

When the floor 18 is constructed, prior to this, the general beams 20 are first connected between the striking struts, and the outer peripheral beams 22 are constructed along the inside of the retaining wall 14. The floor surface 18 is located above the outer beam 20 and the outer peripheral beam 22.
Are constructed by slabification. In the present embodiment, the general beam 20 and the outer peripheral beam 22 are formed of S (steel) beams, each of which is formed of H-section steel. The general beam 20 is a general term for a beam connected to a non-illustrated reverse strut.

Here, in this embodiment, as shown in FIGS. 1 and 2, the H-shaped steel is positioned on the inner surface of the parent pile 10 of the retaining wall 14 below the outer peripheral beam 22 to be constructed. The first base 24 formed by the above is integrally protruded by welding 26. Then, a mounting plate 28a fixed to the lower end of the ground column 28 is integrally joined to the first base 24 by welding 30 (may be fixed with bolts and nuts), and the general beam 20 and the outer peripheral beam are connected to the ground column 28. 22 are connected. The ground column 28 is formed of hollow steel having a rectangular cross section. The end surface of the general beam 20 is welded to the inner surface 28b of the ground column 28 by abutting on both sides 28c and 28d of the ground column 28. The end faces of the outer peripheral beam 22 are welded together.

Therefore, the general beam 20 and the outer peripheral beam 22 are supported by the first gantry 24 via the ground column 28. In this supported state, the general beam 20 and the first gantry 24 are unillustrated with the ground column 28 and the first gantry 24 included. Column formwork is built. Then, an underground column 32 is constructed by casting concrete into the column form from the upper end opening of the column form. The upper flange 22a and the web 22b of the outer peripheral beam 22 are used.
Is provided with a stud 34 to improve the binding property with concrete.

Incidentally, the first mount 24 is provided with a ground pole 28.
A large H-shaped steel is used to support the main piles. However, the parent pile 10 at the mounting portion of the first gantry 24 is provided close to the main pile 10 as shown in FIG. The first gantry 24 is welded by straddling the first gantry 24.
Is increased in mounting rigidity.

FIGS. 1 and 2 show the mounting structure of the first gantry 24 at the portion where the general beam 20, the outer beam 22 and the ground column 28 are joined (column beam joining portion).
As shown in FIG. 3, a second base 36 made of a small H-shaped steel is protruded from the inner surface of the parent pile 10 by welding, and the lower flange 2 of the outer beam 22 is attached to the second base 36 as shown in FIG.
2c is placed directly on the second frame 36 and the outer beam 22.
Are welded 38.

After fixing the outer peripheral beam 22, a wall form (not shown) is installed below the outer peripheral beam 22 along the retaining wall 14, and an upper end between the outer peripheral beam 22 and the retaining wall 14 is provided. The outer peripheral wall 40 is constructed by pouring concrete from the opening by sequential driving.

Accordingly, the outer peripheral beam 2 of the first embodiment described above
In the construction method of No. 2, the first gantry 24 is provided at the joint portion of the outer beam 22 and the second frame is provided at the general portion of the outer beam 22.
The gantry 36 is integrally protruded from the parent pile 10 of the retaining wall 14 by welding, and the first gantry 24 supports the outer peripheral beam 22 via the lower end of the ground column 28, and the second gantry 24 supports the second gantry. The outer beam 22 is directly supported on the gantry 36, and the outer beam 22 is
Is to be built. Therefore, since the hitting strut conventionally connecting and supporting the outer peripheral beam 22 can be eliminated, a complicated structure for placing the hitting strut on the foundation pile near the inside of the retaining wall 14 can be eliminated. It is not necessary to use a special device. On the other hand, in the present embodiment, since the first and second bases 24 and 36 can be welded to the parent pile 10 and the outer beam 22 can be supported thereon, the construction work of the outer beam 22 is simplified, and The support of the outer peripheral beam 22 can be reliably performed.

Further, since the first and second mounts 24 and 36 are welded to the parent pile 10 by retrofitting, the positional accuracy of the mounts 24 and 36 with respect to the outer peripheral beam 22 in the height direction can be increased. Therefore, when the outer beams 22 are supported by the mounts 24 and 36, the horizontality of the outer beams 22 can be easily and accurately set.

Further, as described above, the upside down strut standing upright over the entire height of the basement floor in the vicinity of the inside of the mountain retaining wall 14 is eliminated, so that the obstruction on the inside of the mountain retaining wall 14 is eliminated. , A wide working space can be secured. Also, a large H is attached to the first base 24 at the beam-column joint.
By using a shape steel and welding it to the two parent piles 10, 10, the support rigidity is set high. Therefore, it is possible to support the lower end of the ground column 28 on the first gantry 24, and it is possible to simultaneously advance the basement floor 16 and the ground floor (not shown).

In the present embodiment, the lower end of the ground column 28 to which the outer beam 22 is connected is welded 30 to the first base 24 at the beam-to-column joint, and the outer beam 22 is connected to the second base 36 at the general portion. Since the welding is performed directly on the welding, the respective weldings 30 and 38 can be configured as transmission means for transmitting the horizontal load. Therefore, when the construction of the outer peripheral beam 22 and the floor surface 18 is completed, the horizontal load acting on the retaining wall 14 in the falling direction is applied from the first and second mounts 24 and 36 to the weldings 30 and 38 as the transmission means. Input to the outer beam 22 through the
This horizontal load is supported by the floor surface 18, and it is possible to reliably prevent the retaining wall 14 from collapsing during excavation of the lower floor portion.

In the present embodiment, the first gantry 24 of the beam-to-column joint is formed by excavating the lower portion.
It is desirable to mount a support post 42 below the support 4 to support the load on the ground post 28. Further, the outer peripheral beam 22 shown in FIG.
In the general part of placing concrete,
The upper end of the outer peripheral beam 22 is provided with a fall prevention material 4 such as an angle material.
By supporting the outer concrete beam 4, it is possible to reliably prevent the outer peripheral beam 22 from falling down due to the lateral pressure of the cast concrete.

Further, as shown in FIG.
The portion where 6 protrudes from the outer peripheral wall 40 is covered with the refractory coating layer 46 together with the inner side surface of the outer peripheral beam 22. It may be removed.

FIGS. 4 to 6 show a second embodiment of the present invention, in which the present invention is applied to an RC (reinforced concrete) outer peripheral beam 50. The same components as those in the above embodiment are designated by the same reference numerals. Therefore, a duplicate description will be omitted. FIG.
FIG. 5 is a cross-sectional front view showing an attached state of an outer peripheral beam at a column joint portion, FIG. 5 is a cross-sectional plan view of the same portion, and FIG.

That is, in this embodiment, the outer beam 50 and the general beam 52 are formed by using the PC beam form 54 to form an RC beam, and as shown in FIGS. In the part, the outer peripheral beam 50 is supported by the first gantry 56, and the outer peripheral beam 50 of the general part is supported by the second gantry 58. As in the first embodiment, the first gantry 56 is formed of a large H-shaped steel, and the second gantry 58 is formed of a small H-shaped steel. Parent stake 10 on wall 14
Welded to the inner surface of

The first gantry 56 is formed to be longer than the second gantry 58, and a beam form 54 of the general beam 52 is provided at the tip of the first gantry 56.
The ends are placed, and the beam forms 54 of the outer peripheral beam 50 are placed on the second gantry 58, and the respective beam forms 54 are installed. Then, the beam main reinforcing bars 60 disposed in the beam form 54 of the outer peripheral beam 50 are respectively extended and overlap with each other on the upper side of the first gantry 56, and are disposed in the beam form 54 of the general beam 52. The beam main reinforcement 62 is extended and bent into an L-shape, and the L-shaped distal end portion is disposed in the extended portion of the beam main reinforcement 60.

Then, the outside of the beam-to-column joint where the beam main reinforcing bars 60 and 62 are overlapped with each other is surrounded by a column form (not shown) including the first gantry 56, and concrete is poured into the inside thereof by sequential driving. To construct the underground pillar 64. In addition, this underground pillar 6
4 is constructed as an RC column by arranging a reinforcing bar (not shown) in a column formwork.

As shown in FIG. 6, in the general portion of the outer peripheral beam 50, a beam form 54 is disposed at a predetermined distance from the retaining wall 14, and a beam main reinforcing bar 60 and a shear reinforcing bar 60a are provided in the beam form 54. The outer beam 22 and the outer wall 66 are placed by placing a wall form (not shown) below the beam form 54 and placing concrete in the beam form 54 and the wall form. Be built.

In a state where the beam form 54 is placed on the second frame 58, the beam form 54 is placed on the upper surface of the second frame 58.
A fixing piece 68 as a transmission means that comes into contact with the outer surface on the side of the mountain retaining wall 14 is attached. The fixing piece 68 is embedded in the concrete of the outer peripheral wall 66.

Accordingly, in the method of constructing the outer peripheral beam 22 of this embodiment, the first and second pedestals 5 are used in the same manner as in the first embodiment.
Since the outer peripheral beam 50 is supported by 6, 58, the back strut can be eliminated and the outer peripheral beam 50 can be reliably supported and the construction work can be simplified. Further, even in this embodiment, the first and second mounts 56,
Since 58 is retrofitted, the positional accuracy at the time of attachment to the parent pile 10 can be increased.

The horizontal load acting on the retaining wall 14 can be transmitted to the outer peripheral wall 50 by the fixing piece 68 attached to the second gantry 58. Therefore, the horizontal load can be transmitted to the floor surface. The support 18 ensures that the retaining wall 14 is prevented from collapsing.

In this embodiment, the case where the outer beam 50 and the general beam 52 are formed as RC beams is disclosed.
It may be configured as an SRC (steel reinforced concrete) beam.

FIG. 7 shows a third embodiment of the present invention, in which the same components as those in the above-described embodiments are denoted by the same reference numerals, and redundant description will be omitted. FIG. 7 is a cross-sectional front view showing an attached state of an outer peripheral beam at a column joint portion.

That is, in this embodiment, the outer beam 22 and the general beam 20 are formed as S beams as in the first embodiment, and the schematic configuration is substantially the same as that of the first embodiment. However, the main difference between the present embodiment and the first embodiment is that the first gantry 24 is abolished and the column receiving gantry 70 is provided at a position lower than the position where the outer peripheral beam 22 is formed by a predetermined distance. The receiving stand 70 is welded to the parent pile 10. Then, the lower end portion of the S-shaped ground column 28 is welded to the column receiving gantry 70 to be supported. The column receiving gantry 70 has a steel plate 72 having a predetermined thickness formed in a shelf shape.
It can also be constituted by a shape steel. In addition, the column receiving gantry 70 is buried inside the underground column 32 to improve the appearance.

Accordingly, in this embodiment, not only can the same functions as in the above-described embodiments be exerted, but also the column receiving stand 70 for exclusively supporting the ground column 28 is provided. Not only can the construction of the basement floor proceed at the same time, but also the support rigidity of the ground floor can be further improved.

[0040]

As described above, according to the method for constructing the outer peripheral beam of the basement floor according to the first aspect of the present invention, the outer peripheral beam is supported by a base integrally protruded from the parent pile of the retaining wall. As a result, the back strut connecting the outer beam can be eliminated, and the construction of the outer beam is simplified by eliminating the need for a complicated device for placing the back strut on the foundation pile near the inside of the retaining wall. In addition, it is possible to reliably support the outer peripheral beam. In addition, since the gantry is fixed to the parent pile by retrofitting, the positional accuracy of the gantry with respect to the outer peripheral beam in the height direction can be improved, and the horizontality of the outer peripheral beam can be easily and accurately set. Furthermore, by abolishing the reverse strut standing upright over the entire height of the basement floor near the inside of the retaining wall,
Obstacles at the inner side of the retaining wall can be eliminated to secure a wide working space, thereby facilitating the construction. Furthermore, by increasing the support rigidity of the gantry, the gantry can support the lower end of the ground column, enabling the basement floor and the ground floor to proceed simultaneously, thereby extending the construction period. Can be avoided.

In the method for constructing an outer peripheral beam on a basement floor according to a second aspect, a transmitting means for transmitting a horizontal load acting on the gantry to the outer peripheral beam is provided between the pedestal and the outer peripheral beam. When the construction of the beam and the floor is completed, the horizontal load acting on the retaining wall in the falling direction is input from the gantry to the outer peripheral beam via the transmission means, and the horizontal load is supported by the floor. Therefore, it is possible to reliably prevent the retaining wall from collapsing during excavation of the lower floor portion, and to enhance safety.

Further, according to a third aspect of the present invention, in the method of constructing an outer peripheral beam of a basement floor, a column receiving pedestal is integrally provided with the parent pile by retrofitting the main pile, and the column receiving pedestal is mounted on the column receiving pedestal. Since the above-mentioned pillars were constructed while supporting the above-mentioned pillars arranged along the inner side of the retaining wall, and then the pillar receiving cradle was buried in the underground pillars to be constructed below the pillars. Even when the strut is abolished, the ground pillar constructed near the inner side of the retaining wall can be reliably supported.
For this reason, it becomes possible to support the construction weight of the ground floor by the above-mentioned ground pillars, and the construction of the basement floor and the construction of the ground floor can proceed simultaneously, so that it is possible to shorten the construction period. it can. In addition, since the column receiving gantry is buried in the underground column constructed in the lower part, the appearance can be improved, and it is possible to avoid that only the column receiving pedestal is protruded and obstructed. It has various excellent effects.

[Brief description of the drawings]

FIG. 1 is a cross-sectional front view showing a first embodiment of the present invention, in which a peripheral beam is attached at a column joint portion.

FIG. 2 is a cross-sectional plan view showing an attached state of an outer peripheral beam at a column joint portion according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional front view of the outer peripheral beam according to the first embodiment of the present invention in a state where the outer peripheral beam is attached to a general portion.

FIG. 4 is a cross-sectional front view showing a second embodiment of the present invention, in which a peripheral beam is attached at a column joint portion.

FIG. 5 is a cross-sectional plan view showing a mounted state of an outer peripheral beam at a column joint portion according to a second embodiment of the present invention.

FIG. 6 is a cross-sectional front view showing a mounted state of a general part of an outer peripheral beam according to a second embodiment of the present invention.

FIG. 7 is a cross-sectional front view showing a third embodiment of the present invention, in which a peripheral beam is attached at a column joint portion.

FIG. 8 is a plan view showing a relationship between a back strut and a foundation pile by a conventional reverse striking method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Parent pile 14 Mountain retaining wall 16 Basement floor 18 Floor surface 22 Outer peripheral beam 24 1st pedestal 28 Above ground column 30, 38 Welding (transmission means) 32 Underground column 36 2nd pedestal 50 Outer peripheral beam 56 1st pedestal 58 2nd pedestal 64 Underground Post 68 Fixing piece (Transmission means) 70 Post support

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Koichiro Kurisu 4-640 Shimoseito, Kiyose-shi, Tokyo Obayashi Technical Research Institute

Claims (3)

[Claims] [Claim 1] A plurality of parent piles are cast around the basement to be constructed at appropriate intervals, and a pile retaining wall is constructed by closing a gap between the parent piles with a sheet pile or the like, and the inside of the mountain retaining wall is constructed. In the reverse striking method in which the ground is excavated while constructing the beam and the floor surface in order from the upper floor to construct the underground floor, the lower side of the outer peripheral beam constructed along the inside of the retaining wall A method of constructing an outer beam of a basement floor, comprising: projecting a stand integrally with the parent pile by retrofitting to the parent pile, and constructing the outer beam while supporting the outer beam on the stand. . 2. The underground floor outer beam according to claim 1, further comprising a transmission means for transmitting a horizontal load acting on the base to the outer beam between the base and the outer beam. Construction method. 3. A column support gantry, which is located below the gantry and is integrally formed with the parent stake by retrofitting, and supports a ground column arranged along the inside of the retaining wall on the column gantry. The method according to claim 1, wherein the column is constructed in a state in which the column is supported, and then the column support is buried in an underground column constructed below the column.