JPH07268885A - Method of drive construction used for construction of subsurface structure - Google Patents

Abstract

PURPOSE: To decrease the term of work by constructing a raft foundation body on inner wall surface of a wall type diaphragm wall, suspending and lowering a raft foundation pile by suspending means with template and template supporting means placed and left thereon and then constructing each floor slab. CONSTITUTION: Diaphragm retaining walls are constructed along the periphery of a square property line, a supporting pile 10 is erected on the top surface of the diaphragm wall, a caisson pile 3 is built inside the site, an intermediate supporting pile 2 is erected on the caisson pile 3, and primary excavation is performed. Next, a raft foundation body 6 is built, timbering means 5 for supporting the diaphragm wall to the foundation body 6 is installed, a bracket 73 is provided on the upper portion of the piles 10 and 2 and suspending means 71 is installed. Then, a template 4 and template supporting means are placed on the top surface of the foundation body 6, and a floor slab 8 is placed on the first basement floor. And second excavation is performed below the foundation body 6, the foundation body 6 is suspended and lowered to a predetermined height by suspending means 71 with the template 4 and template supporting means kept placed, and a floor slab for the first basement floor is placed on the template 4 on the top surface of foundation body 6, and same work is repeated thereafter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention is applicable to underground structures such as
TECHNICAL FIELD The present invention relates to an excavation method suitable for constructing an underground space such as an underground parking lot of a building, and more particularly to a reverse winding excavation method using a raft foundation as a support for earth retaining supports and floor slab templates.

[0002]

2. Description of the Related Art Generally, types of excavation methods can be classified according to geological conditions, site conditions, etc., excavation methods, and construction methods of structures.

The classification according to the construction method of the structure can be roughly classified into a forward winding method and a reverse winding method. Especially in large-scale excavation with a wide excavation width and a deep excavation depth, when construction is required for a long time to construct a frame, and for example, when constructing an underground space such as an underground parking lot of a building. The reverse winding method is often used. In the conventional reverse winding method, (I) first, for example, a step of constructing a wall-type underground continuous wall soil retention by a normal excavation method, (II) a step of constructing an intermediate pillar in parallel with the soil retention work, and (III) ground The step of performing the primary excavation to a predetermined depth below the floor surface of the floor slab on the first floor, for example, a depth of -2 m from the floor surface of the ground first floor, and (IV) hitting the floor slab on the ground first floor A template for installation and a support means for supporting it on the lower floor; (V) a step of placing a floor slab on the ground first floor; (VI) a floor slab on the ground first floor The step of removing the template and the supporting means thereof to make the floor slab on the first floor above ground into an earth retaining beam, and (VII) subsequently, a predetermined depth below the floor of the first floor below ground, for example, the first floor below ground. Of secondary excavation to a depth of -2 m from the floor of the floor slab in (VIII) underground A step of placing a template for placing a floor slab on the first floor and a supporting means for supporting it on the lower floor; (IX) a step of placing the floor slab on the first basement floor; A step of removing the template of the floor slab on the first basement floor and its supporting means to make the floor slab on the first basement floor a soil retaining cut;
After the steps of I) to (X) are repeated to complete the final excavation, a step of constructing a lower floor or a raft foundation and a step (XII) of closing the work hole to complete the structure.

According to the conventional reverse winding method, since the placed floor slab can be used as a horizontal sill, a large digging width and a deep digging depth can be used for large-scale digging. Since it takes a period of time, it can be suitable when safety is required for construction, but after placing the floor slab on each floor, be sure to install the template and the template that was erected for placing the floor slab to support it. The excavation work for building the next floor slab can only be carried out after removing the support means. Further, in order to build the next floor slab, the template for driving the floor slab and the supporting means for supporting the floor slab must be re-installed, so that the template and the supporting means are erected. Since work and removal work are repeated, unnecessary work increases, a large number of personnel are required, and it also takes time, so problems such as a long construction period and high cost remain. .

Further, in the conventional reverse winding method, it is intended to use the placed floor slab as a soil retaining cut beam.
Until the concrete of the floor slab has sufficient supporting strength to support the wall type underground continuous wall soil retention,
Since it takes a long number of days, it is difficult to shorten the construction period.

[0006]

In view of the above problems, the present invention eliminates the need to remove the support means of the template of the floor slab each time the floor slab is built when building an underground structure. Moreover, it is an object of the present invention to provide a reverse winding excavation method capable of supporting wall-type underground continuous wall soil retention at an early stage.

Another object of the present invention is to provide a suspending means applicable to the reverse winding open-cutting method.

[0008]

In order to solve the above problems, in the excavation method used for the construction of an underground structure of the present invention, (I) a wall type underground continuous wall is constructed and at the same time, the wall type underground continuous wall is constructed. The step of erected a plurality of support piles so as to project from the upper surface of the wall-type underground continuous wall at a plurality of locations, and (II) at the same time as the earth retaining work, at the same time build a deep foundation and The process of standing the intermediate support pile on the foundation, and (II
I) a step of performing a primary excavation to a predetermined depth below the floor surface of the floor slab on the first floor, and (IV) constructing a raft foundation separated from the inner wall surface of the wall type continuous underground wall by a predetermined distance And (V) installing support means for supporting the wall type underground continuous wall on the raft foundation, providing a blanket on the upper part of each of the support piles and the intermediate support piles, and further on each blanket. A step of installing suspension means for suspending the raft base body and fixing the wire rope suspended from each suspension means to the raft base body, (VI) Placing a floor slab on the ground floor Placing a template for supporting and a template supporting means for supporting the template on the upper surface of the raft foundation, and (VII) ground on the template mounted on the upper surface of the raft foundation. Placing the floor slab on the first floor, and (VIII)
Up to a predetermined depth below the floor of the floor slab on the first basement floor 2
And (IX) suspending the raft base body by the suspension means while suspending the raft base body and the template support means for supporting the raft base body on the ground 1
A step of separating from the lower surface of the floor slab of the floor and suspending the raft base body to a predetermined height, and (X) a support work for supporting the wall type underground continuous wall by the support means installed on the raft base body And the step of placing a floor slab on the first basement floor on the template placed on the upper surface of the raft foundation, and (XI) repeating the operations of (VIII) to (X) above, After the completion of the excavation, the method is characterized by comprising the steps of placing the raft foundation in the ground and (XII) finally closing the work hole to complete the underground structure.

[0009]

According to the excavation method used for constructing the underground structure of the present invention as described above, the raft foundation is immediately constructed after the primary excavation, and the floor of the ground floor is on the upper surface of the raft foundation. A floor slab on the first floor of the ground can be cast simply by placing a template for placing the slab and a template support means for supporting the template. Also, when placing a floor slab below the first basement floor, the raft foundation is hung up to a predetermined height by the suspending means, and the floor slab placed on the upper surface of the raft foundation is placed. The template and template supporting means can be used as they are. Therefore, unlike the conventional reverse winding method, it is possible to omit the wasteful work of re-installing the template and the template support means each time the floor slab is placed, and thus, it is possible to greatly reduce The number of working days can be shortened, and it is particularly suitable for large-scale drilling with a deep drilling depth. In addition, since it is possible to support the wall type underground continuous wall by using the supporting means installed on the raft foundation, immediately after suspending the raft foundation to a predetermined height by the suspending means. By supporting the wall type underground continuous wall with its supporting means, the amount of deformation of the wall type underground continuous wall can be greatly suppressed compared to the conventional reverse winding method, so it is also extremely safe. ing.

[0010]

EXAMPLE An example of an excavation method used for constructing an underground structure according to the present invention will be described below in order with reference to FIGS.

FIG. 1 shows (I) to (I) of the excavation method of this embodiment.
It is sectional drawing which shows the process of I).

In the step (I), first, a wall-type underground continuous wall soil retention 1 is constructed along with a predetermined shape for constructing an underground structure by a usual method, for example, around a square site. The support piles 10 made of, for example, H-shaped steel or round steel pipes are erected at a plurality of locations on the wall type underground continuous wall 1 so as to project from the upper surface of the wall type underground continuous wall 1.

Subsequently, in the step (II), in parallel with the earth retaining work, a plurality of deep foundations 3 produced by a normal method are constructed at predetermined places in the site, and the deep foundations 3 are respectively constructed. For example, an intermediate support pile 2 made of, for example, an H-shaped steel or a round steel pipe is erected so that its upper portion projects from the ground.

FIG. 2 shows (III) to (V) of the excavation method of this embodiment.
It is sectional drawing which shows the process of I).

In the step (III), the ground 1 is formed by a usual method.
A predetermined depth below the floor surface of the floor slab, for example, the ground 1
First excavation is performed from the floor of the floor to a depth of -4m.

Subsequently, in the step (IV), the raft base body 6 is built on the floor surface of the excavated lower floor having a predetermined depth by a usual method. As shown in FIGS. 8 and 9, each edge portion of the raft base body 6 is separated from the inner wall surface of the wall type underground continuous wall 1 by a predetermined distance l. In terms of the construction accuracy of ordinary wall-type underground continuous wall soil retention, the accuracy is about 1/300.
For example, when the excavation depth is 20 m, the vertical deviation amount of the wall type underground continuous wall is about 7 cm, and as the excavation work progresses, the wall type underground continuous wall due to earth pressure acting on the soil retention Since the amount of deformation of the underground continuous wall may reach about 15 cm or more, in the case of the present embodiment, the distance between the inner wall surface of the wall type underground continuous wall 1 and the edge of the raft foundation 6 is If the predetermined distance l is set to, for example, 50 cm or more, when the raft base body 6 is suspended as described below,
It can be ensured that it does not come into contact with the inner wall surface of the wall-type underground continuous wall 1.

Further, when the raft base body 6 is built, an excavating machine, for example, a power shovel P (see FIG. 4), which will be described later, is carried to an appropriate site of the body of the raft base body 6 to an excavation site, or A working hole 65 (see FIG. 4) for a path such as a clam cell C (see FIG. 4) for taking out excavated soil from the excavation site onto the ground is provided in advance. Further, a through hole 64 is provided in advance at a portion where the intermediate support pile 2 and the raft base body 6 intersect with each other. In terms of the construction accuracy of a normal support pile, the accuracy is about 1/300. For example, when the excavation depth is 20 m, the vertical deviation amount of the support pile is about 7 cm. If the space between the intermediate support pile 2 and the intermediate support pile 2 is set to about 15 cm, the raft foundation 6
When performing a hanging operation as described below, it can be ensured that the intermediate support pile 2 and the inner wall surface of the through hole 64 of the raft foundation 6 do not come into contact with each other.

Subsequently, in the step (V), the raft base body 6 is formed.
A plurality of supporting means 5 for supporting the wall-type underground continuous wall 1 are installed near each end of the bottom plate 62, and a blanket 73 is provided on each of the support piles 10 and the intermediate support piles 2, respectively. Further, suspending means 71 for suspending the raft base body 6 is installed on each blanket 73,
The wire rope 72 suspended from each suspension means 71 is fixed to the bottom plate 62 of the raft base body 6.

Subsequently, in the step (VI), the template 4 for placing the floor slab on the first floor of the ground and the template support means 42 (see FIG. 8A) for supporting it are provided on the raft. Basic body 6
It is placed on the top surface of the top plate 61 of.

FIG. 3 is a sectional view showing a step (VII) of the excavation method of this embodiment.

In the step (VII), a floor slab 8 on the first floor of the ground is placed on the template 4 placed on the upper surface of the top plate 61 of the raft foundation 6, and the floor of the first floor of the ground is placed. The slab 8 is integrated with the upper end of the wall type continuous underground wall 1. For the same reason as in the step (IV), an excavating machine, such as a power shovel P (see FIG. 4), which will be described later, is attached to each of the floor slab 8 and the template 4 on the ground floor to the excavation site. Work holes 81 and 41 (see FIG. 4) of a path such as a clam cell C (see FIG. 4) for carrying in or removing excavated soil from the excavation site onto the ground are provided in advance.

FIG. 4 is a sectional view showing a step (VIII) of the excavation method of this embodiment.

In the step (VIII), a working hole 81 of the floor slab 8 on the first floor of the ground where an excavating machine such as a power shovel P is provided, a working hole 41 of the template 4, and the raft foundation 6 The work is introduced through the work hole 65 of No. 2, and secondary excavation is performed to a predetermined depth below the floor surface of the floor slab 84 on the first basement floor, for example, to -4 m, and the excavated earth and sand is pumped to the ground using the clam cell C.

FIG. 5 shows (IX) of the excavation method of this embodiment.
It is sectional drawing which shows the process of (X).

In the step (IX), the raft base body 6 is suspended by the suspension means 71 while the template board 4 and the template support means 42 for supporting the raft foundation body 6 are suspended. The raft foundation body 6 is hung down to a predetermined height so as to be separated from the lower surface of the floor slab 8 on the first floor and to be placed on the upper surface of the lower floor formed by the secondary excavation.

In the step (X), the supporting means 5 installed on the raft base body 6 carries out the supporting work for supporting the wall-type underground continuous wall 1, and is further placed on the upper surface of the raft base body 6. A floor slab 84 on the first basement floor is placed on the template 4.

FIG. 6 shows (XI) to (XI) of the excavation method of this embodiment.
It is sectional drawing which shows the process of I).

In the step (XI), the above (VIII)-
Repeat the operation of (X) and the floor slab 86 on the second basement floor.
To place. Further, after the final excavation is completed, the raft foundation body 6 is placed in the ground and driven so as to be integrated with the wall type underground continuous wall 1.

In the step (XII), finally, the working hole 6 is
Closing 5, 81 and 41 completes the underground structure.

Next, the detailed structure of the raft base body 6 of this embodiment will be described.

FIG. 7 illustrates two means for fixing the anchor of the wire rope of the suspending means to the raft foundation in the embodiment of the present invention. What is displayed on the right side of the drawing is that when the raft base body 6 is driven, a thread pipe 74 is vertically embedded in the vicinity of the end of the raft base body 6 in advance and the blanket 73
The rope-shaped anchor 75 provided at the end of the wire rope (eg, PC steel wire) 72 suspended from the suspension means 71 installed at the upper part of the above is inserted into the threaded pipe 74, and concrete without shrinkage control is provided. In this example, the anchor 75 is fixed in the raft base body 6 by driving 76 into the thread pipe 74. In this example,
Template 4 and floor slab 8 placed on the upper surface of raft base body 6
The beam portion 81 of FIG.

Another example shown on the left side of the figure is a wire rope (eg, a wire rope suspended from a suspension means 71 installed on the upper part of the blanket 73 when the raft base body 6 is driven. The ball-shaped anchor 78 provided at the end of the (PC steel wire, etc.) 72 is previously arranged at a predetermined portion of the raft base body 6 and then concrete is poured to directly insert the raft base body 6 into the raft base body 6. It is an example of fixing to. In this example, the template 4 placed on the upper surface of the raft base body 6
And the floor slab 8 are illustrated.

FIG. 8 shows a supporting means 5 which is arranged on the upper surface of the bottom plate 62 of the raft base body 6 and supports the wall type underground continuous wall 1. In the figure, the support means 5 comprises a hydraulic jack 52 and a cut-off member 51 made of H-shaped steel that is in contact with a piston rod 53 of the hydraulic jack 52. One end of the main body of the hydraulic jack 52 is a bolt. Is locked to a locking block 54 fixed to the upper surface of the bottom plate 62, the piston rod 53 of the hydraulic jack 52 is in contact with one end of the cut-off member 51, and the other end of the cut-off member 51 is connected to the wall. The continuous underground wall 1 is pressed and supported. Since the wall type underground continuous wall 1 is supported via the cut-off member 51, by adjusting the expansion / contraction amount of the piston rod 53 of the hydraulic jack 52, the deformation of the wall type underground continuous wall 1 into the excavated surface can be prevented. Can be suppressed.

Further, in the figure, if the interval l between the edge of the raft foundation 6 and the inner wall surface of the wall type underground continuous wall 1 is set to, for example, 50 cm or more for the above-mentioned reason, When the work of suspending the raft base body 6 is performed, it can be ensured so as not to contact the inner wall surface of the wall type underground continuous wall 1. Of course, when the raft foundation 6 is suspended, it is necessary to set the hydraulic pressure of the hydraulic jack 52 to 0 and release the cut-off member 51 from the contact state with the inner wall surface of the wall type underground continuous wall 1. is there.

In the figure, template support means made of I-shaped steel, which is installed on the top surface of the top plate 62 of the raft base body 6 and supports the template 4 for striking the floor slab 8 on the ground floor. The arrangement of 42 is also shown. Reference numeral 41 is a template for hitting the beam portion 81 of the floor slab 8 on the ground floor.

FIG. 9 shows another embodiment of the supporting means used in the excavation method of the present invention. In this example, the supporting means 5'comprises a hydraulic jack 57 and a plurality of rollers 58 provided on one surface of the hydraulic jack. The supporting means 5'is a hoisting means provided on the floor 8 on the ground floor, for example, a hoist 56. Is suspended so as to be located between the wall type underground continuous wall 1 and the raft foundation body 6,
The plurality of rollers 58 are movably provided along a guide rail 55 provided at an end edge portion of the raft base body 6.

By adjusting the amount of expansion and contraction of the piston rod of the hydraulic jack 57, the raft foundation 6 can support the ground pressure of the wall type underground continuous wall 1 through this support means 5 ', so that the wall type The deformation of the underground continuous wall 1 to the excavated surface can be suppressed. Also, compared with the supporting means 5 shown in FIG. 8, the mobility of the supporting means 5'in this example is superior to the former.

In addition, in the cutting method of the present invention, the raft base body 6
When the work of suspending the raft by the suspending means is performed, it is necessary to uniformly lower the whole raft base body 6, so that all the suspending means used are one cycle of operation to suspend the raft base body 6. Since it is required that all the wire ropes 72 for suspending are simultaneously lowered gently to a substantially constant length, the present inventor has developed a suspending means 71 capable of achieving the above-mentioned function.

Next, the structure of the suspension means 71 used for suspending the raft foundation 6 in the excavation method of the present invention will be described with reference to FIG.

As shown in FIG. 10, the suspending means 71 includes a cylindrical body 710, two main jacks 717 and 717 erected parallel to each other inside the cylindrical body 710, and the two main jacks. A support block 718 installed on the upper surfaces of the reference numerals 717 and 717, and two lower positioning jacks 7160 that are vertically erected parallel to the insides of the two main jacks 717 and 717 below the support block 718;
7160 and these two lower positioning jacks 716
No. 0, 7160 and two lower bottom toy seats 7150 and 7150 arranged in parallel, and the lower bottom toy seats 71.
Lower positioning plate 71 placed on the upper surface of the 50, 7150
40, a lower spring 7110 provided so as to abut the lower surface of the support block 718, and the lower spring 711.
Lower push plate 712 provided integrally with the spring at the bottom of 0.
0, two upper positioning jacks 716 and 716 erected parallel to the upper surface of the support block 718, the two upper positioning plates 714, and the lower surface of the top plate 719 of the cylindrical body 710. Upper spring 7 provided like
11, an upper pushing plate 712 provided integrally with the upper spring 711 below the upper spring 711, and a plurality of, for example, two wire ropes (PCs) arranged so as to vertically pass through the inside of the cylindrical body 710. 72, 72, and the cylindrical body 710.
Is provided inside and is attached so as to be movable along the wire ropes 72, 72.
Two upper tightening toys 71 for sandwiching 2, 72
3, 713 and two lower fastening toys 7130, 713
And 0.

The length of the wire rope 72 is at least a distance corresponding to the planned depth of descent from the upper surface of the suspension means 71 to the last position where the raft foundation 6 is placed in the ground. I need. In addition, the upper fastening unit 713
As shown in FIG. 18, for example, a two-piece or three-piece ear toy member 713 'is movably attached along a wire rope 72 by a stop ring 7131, and one end thereof is formed in a tapered shape. ing. When the upper tightening toy 713 is attached to the wire rope 72 and is inserted into the tapered upper upper toy seat 715 as the wire rope 72 descends, the tapered surface of the upper tightening toy 713 and the taper of the upper upper toy seat 715. The teeth formed on the inner surface of the toy member 713 'strongly bite the wire rope 72 as it abuts against the surface, that is, the wire rope 72 is clamped by the upper tightening toy 713, and is thus held by the upper yatto seat 715. Since it is supported, the lowering of the wire rope 72 is stopped in this state.

Next, referring to FIGS. 10 to 17, the operation of the suspension means 71 used in the excavation method of the present invention in one cycle will be described.

First, as shown in FIG. 10, the lower tightening toys 7130 and 7130 are inserted into the lower lower toy seats 7150 and 7150 with the wire ropes 72 and 72 being sandwiched therebetween, and the load of the wire ropes 72 and 72 (shared). (The load of the raft foundation body 6) is received by the lower yatoe seats 7150 and 7150. In this state, the upper tightening toys 713 and 713 remain attached to the wire ropes 72 and 72, and It is in a state of being separated from 715 and 715.

Next, as shown in FIG. 11, the wire rope 7
While the load of 2, 72 is being received by the lower jaw seats 7130, 7130, the upper positioning jack 71
6,716 rises by a predetermined height, for example 15 cm. The upper positioning plate 714 is also raised by 15 cm as the upper positioning jack 716 is raised. As a result, the upper tightening toys 714, 714 are moved upward by 15 cm along the wire ropes 72, 72 as the upper positioning plate 714 rises.
It is lifted and its upper surface abuts the lower surface of the upper push plate 712.

Next, as shown in FIG. 12, the wire rope 7
While the load of 2, 72 is being received by the lower jaw seats 7150, 7150, the upper positioning jack 71
6 and 716 return to their original positions and are left at the upper position of the wire ropes 72 and 72, that is, at a position approximately 15 cm above the upper positioning plate 714, as they are, by the upper tightening toys 714 and 714 that have been lifted up 15 cm.

Next, as shown in FIG. 13, the wire rope 7
While the load of 2, 72 is being received by the lower yatoi seats 7150, 7150, the main jacks 717, 71
7 has risen by a predetermined height, for example 20 cm, and the upper tightening toys 715, 715 are lifted as it rises to receive the upper tightening toys 713, 713, and the rise of the main jacks 717, 717 exceeds 15 cm. The load of the wire ropes 72, 72 is gradually transferred to the upper yatoe seats 715, 715.

Next, as shown in FIG. 14, during the period when the rise of the main jacks 717, 717 exceeds 15 cm to a predetermined height, for example, 20 cm, the wire rope 7
Since the loads of 2, 72 are received by the upper yatoi catches 715, 715, the main jacks 717, 717
The lower fastening toys 7130, 7130 are pulled up by about 5 cm from the lower bottom toy receiving seats 7150, 7150 as the ascending.

Next, as shown in FIG. 15, the wire rope 7
The lower positioning jack 7160, while the load of 2, 72 is being received by the upper jaw toys 715, 715,
7160 is raised by a predetermined height, for example 15 cm. The lower positioning plate 7140 which is raised as it rises lifts the lower tightening toys 7130, 7130 upward by 15 cm along the wire ropes 72, 72. Lower fastening toy 713
The upper surfaces of the 0 and 7130 are brought into contact with the lower surface of the lower push plate 7120.

Next, as shown in FIG. 16, the wire rope 7
The lower positioning jack 7160, while the load of 2, 72 is being received by the upper jaw toys 715, 715,
7160 descends by 15 cm, that is, returns to its original position,
The lifted lower tightening toy 7130, 7130
Is left as it is at the upper position of the wire ropes 72, that is, at a position approximately 15 cm above the lower positioning plate 7140.

Next, as shown in FIG. 17, the wire rope 7
The main jacks 717 and 717 are lowered by a predetermined height, for example, 20 cm while the loads of 2, 72 are being received by the upper yatto seats 715 and 715. Main jack 71
From the time when the descent of 7 and 717 exceeds 15 cm, the load of the wire ropes 72 and 72 gradually decreases to the lower yatto seat 715.
0, 7150, and the operation for one cycle is completed. The suspension means 71 lowers the wire ropes 72, 72 downward by a predetermined length, for example, 20 cm by this one-cycle operation, that is, the raft base body 6 moves downward by 20 cm.
It is hung down. By repeating this operation, the raft base body 6 can be uniformly lowered to a predetermined depth.

Further, FIG. 19 schematically shows the arrangement of the suspending means 71, but the portions indicated by stripes are the suspension means 71.
Indicates a portion which bears the load of the raft base body 6.
Since the load shared by each suspension means 71 can be calculated by the calculation, the main jack 7 inside the suspension means 71 arranged in each portion can be calculated according to the load of each portion.
The area of 17 pistons can also be calculated.

FIG. 20 is a block diagram showing the construction of the hydraulic circuit for controlling the hydraulic jack in the suspending means 71 used in the excavation method of the present invention. 71 can be operated synchronously.

[0053]

According to the excavation method used for the construction of the underground structure of the present invention as described above, the raft foundation is immediately constructed after the primary excavation, and the raft foundation is grounded on the upper surface of the ground floor. The floor slab on the first floor of the ground can be driven only by placing the template for striking the floor slab and the template supporting means for supporting it. Also, when placing a floor slab below the first basement floor, the raft foundation is hung up to a predetermined height by the suspending means, and the floor slab placed on the upper surface of the raft foundation is placed. Since the template and template support means of can be used as they are, waste of having to re-install the template and template support means each time the floor slab is laid, as in the conventional reverse winding method. Since repeated work can be omitted, the number of working days can be shortened significantly, which is particularly suitable for large-scale drilling with a deep drilling depth. In addition, since it is possible to support the wall type underground continuous wall using the support means installed on the raft foundation, after the raft foundation is hung up to a predetermined height by the suspension means, Immediately supporting the wall-type underground continuous wall with the supporting means can significantly reduce the amount of deformation of the wall-type underground continuous wall compared to the conventional reverse winding method, so it is very safe. Are better.

Further, since the construction equipment, such as the suspension means and the support means, both use hydraulic means, there is an advantage that not only the safety is high, but also the equipment can be reused repeatedly.

Further, since the volume of construction equipment is small and the space occupied is small, the working space can be easily secured.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing steps (I) to (II) in an embodiment of an excavation method used for constructing an underground structure according to the present invention.

FIG. 2 is a cross-sectional view showing steps (III) to (VI) in an embodiment of an excavation method used for constructing an underground structure according to the present invention.

FIG. 3 is a sectional view showing a step (VII) in an example of the excavation method used for the construction of an underground structure according to the present invention.

FIG. 4 is a sectional view showing a step (VIII) in an example of the excavation method used for the construction of an underground structure according to the present invention.

FIG. 5 is a cross-sectional view showing steps (IX) to (X) in an embodiment of an excavation method used for constructing an underground structure according to the present invention.

FIG. 6 is a cross-sectional view showing steps (XI) to (XII) in an embodiment of an excavation method used for constructing an underground structure according to the present invention.

FIG. 7 is a cross-sectional view showing two means for fixing the anchor of the wire rope of the suspension means to the raft base body in the embodiment of the present invention.

FIG. 8 is a cross-sectional view showing one embodiment of the supporting means in one embodiment of the present invention.

FIG. 9 is a sectional view showing another embodiment of the supporting means in one embodiment of the present invention.

FIG. 10 is a cross-sectional view showing an operation cycle of the hydraulic jack in the suspending means in the embodiment of the present invention, in which the lower tightening toy is inserted into the lower toy seat while holding the wire rope, and the load of the wire rope is applied. It is a figure which shows the state received by the lower Yatoi seat.

FIG. 11 is a view showing a state in which the upper tightening toy is lifted up along the wire rope by the upper positioning plate that rises as the upper positioning jack moves up while the load of the wire rope is being received by the lower yat seat.
It is a figure similar to.

FIG. 12 shows a state in which the upper positioning jack is returned to its original position while the load of the wire rope is being received by the lower yatoe seat, and the lifted upper tightening toy remains in the upper position of the wire rope. It is a figure similar to FIG.

[Fig. 13] While the load of the wire rope is being received by the lower yatoi seat, the upper tightening toy is received by the upper yatoi seat lifted by the rise of the main jack, and the load of the wire rope is transferred to the upper yatoi seat. FIG. 11 is a view similar to FIG.

FIG. 14 is a state in which the load of the wire rope is received by the upper yatoi seat, and as the main jack rises,
FIG. 11 is a view similar to FIG. 10, showing a state in which the lower tightening toy is pulled up from the lower lock toy seat.

FIG. 15 is a view showing a state in which the lower tightening toy is lifted up along the wire rope by the lower positioning plate that rises as the lower positioning jack moves up, while the load of the wire rope is being received by the upper yayto seat.
It is a figure similar to.

FIG. 16 shows a state in which the lower positioning jack is returned to its original position while the load of the wire rope is being received by the upper yatoe seat, and the lifted lower tightening toy remains in the upper position of the wire rope. It is a figure similar to FIG.

FIG. 17: With the load of the wire rope being received by the upper yatoi seat, as the main jack descends,
It is a figure similar to FIG. 10 which shows the state which has transferred the load of a wire rope to a lower yatoi seat.

FIG. 18 is a sectional view showing a tightening toy and a toy seat in the suspension means according to the embodiment of the present invention.

FIG. 19 is a schematic plan view showing the arrangement of suspension means in one embodiment of the present invention.

FIG. 20 is a block diagram showing a configuration of a hydraulic circuit for controlling a hydraulic jack of suspension means according to an embodiment of the present invention.

[Explanation of symbols]

 1 Wall-type underground continuous wall 2 Intermediate support pile 3 Deep foundation 4 Template 5, 5'Supporting means 6 Raft foundation 8 Ground floor 1st floor slab 10 Supporting pile 41 Working hole 42 Template support means 52 Hydraulic jack 53 Piston rod 54 Locking block 55 Guide rail 56 Hoisting machine 57 Hydraulic jack 58 Roller 61 Top plate 62 Bottom plate 64 Through hole 65 Working hole 71 Suspending means 72 Wire rope 73 Blanket 81 Working hole 84 Basement 1st floor slab 86 Basement 2nd floor slab 710 Cylindrical body 711 Upper spring 712 Upper push plate 713 Upper tightening toy 714 Upper positioning plate 715 Upper upper toy seat 716 Upper positioning jack 717 Main jack 718 Support block 719 Top plate 7110 Lower spring 7120 Lower pushing plate 7130 Lower tightening toy 7140 Lower -Decided Me plate 7150 lower lens holder unit seat 7160 lower positioning jack C Kuramuseru P excavators

Claims (4)

[Claims] 1. (I) A wall-type underground continuous wall earth retaining structure is constructed, and a plurality of support piles are erected at a plurality of locations on the wall-type underground continuous wall so as to project from the upper surface of the wall-type underground continuous wall. And (II) a step of building a deep foundation in at least one place in parallel with the earth retaining work, and erecting an intermediate support pile on the deep foundation, and (III) a floor slab on the ground floor A step of performing a primary excavation down to a predetermined depth, (IV) a step of constructing a raft foundation separated from an inner wall surface of the wall-type underground continuous wall by a predetermined distance, and (V) a raft foundation A support means for supporting the wall-type underground continuous wall is installed, and a blanket is provided on an upper portion of each of the support piles and the intermediate support pile, and a suspension means for suspending the raft foundation on each blanket. The wire rope suspended from each suspension means. A step of fixing to a raft foundation, and (VI) a step of placing a floor slab on the first floor of the ground and a step of supporting a template for supporting the template on the upper surface of the raft foundation. , (VII) a step of placing a floor slab on the ground floor on a template placed on the upper surface of the raft foundation, and (VIII) a predetermined depth below the floor surface of the floor slab on the basement floor. Then, the second excavation step is performed, and (IX) the suspension means suspends the raft foundation while the template and the template supporting means for supporting the raft foundation are suspended, and the template is ground 1 A step of separating from the lower surface of the floor slab of the floor and suspending the raft foundation to a predetermined height, and (X) a supporting work for supporting the wall-type underground continuous wall by the supporting means installed on the raft foundation And the ground on the template placed on the upper surface of the raft foundation. A step of placing a floor slab on the first floor, (XI) a step of placing the raft foundation in the ground after the final excavation by repeating the operations of (VIII) to (X), and (XII) Finally, the excavation method used in the construction of the underground structure, which comprises the step of closing the work hole and completing the underground structure. 2. The excavation method used in the construction of an underground structure according to claim 1, wherein the supporting means is composed of an H-shaped steel cutting member and a hydraulic jack. 3. The wall-type underground continuation means, wherein the supporting means comprises a hydraulic jack and at least one or more rollers provided on one surface of the hydraulic jack. The excavation method used for constructing an underground structure according to claim 1, wherein the method is suspended so as to be located between a wall and the raft foundation. 4. A cylindrical body, at least one or more wire ropes arranged so as to vertically penetrate through the cylindrical body, an upper clamping means and a lower clamping means for clamping the wire rope, and a series. A plurality of hydraulic jacks installed in the up-down direction, and by operating the plurality of hydraulic jacks, the load of the wire rope applied to the upper clamping means or the lower clamping means is applied to the lower clamping means or the upper clamping means. Suspending means for unilaterally suspending the wire rope by a predetermined length by operating the hydraulic jacks in one cycle.