JPH08177055A - Press-in caisson - Google Patents

Abstract

PURPOSE: To execute works for pressing-in and sinking of a caisson at the inside of the caisson by a method wherein an advantage of utilizing an anchorage material as a reaction force in pressing-in of the caisson is utilized while installation and removal of reaction force beams for pressing-in are obviated. CONSTITUTION: A plurality of anchorage materials 5, arranged at specified intervals and fixed at their ends to the ground G, are penetrated through a workroom slab 3 of a caisson 1, and a gap between each of anchorage material- piercing holes 4 and each of the anchorage materials 5 is sealed up tight with a hermetical anchorage insertion device 7, and press-in jacks 25 are arranged, corresponding to the anchorage materials 5, on the workroom slab 3. The anchorage materials 5 are connected to the press-in jacks 25. While the ground G on the bottom of a workroom 2 of the caisson 1 is excavated, the caisson 1 is pressed in and sunk into the ground G by the press-in jacks 25 with the anchorage materials 5 utilized to work as reaction force.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press-fit caisson,
More specifically, it relates to a press-fitting caisson in which a caisson is press-fitted with an anchor material as a reaction force by a press-fitting jack and then is sunk.

[0002]

2. Description of the Related Art FIGS. 9 and 10 show a prior art of a type in which a caisson is press-fitted by a reaction force of an anchor material by a press-fitting jack to be sunk.

In the prior art shown in these figures, the construction is carried out as follows. The anchor material 40 is arranged outside the caisson 1, and the lower end portion thereof is fixed to the ground G. A press-fitting reaction force girder 41 is installed on the upper part of the caisson 1, a press-fitting jack 42 is installed on the upper part of the caisson 1, and the upper end side of the anchor member 40 is connected to the press-fitting jack 42. In the working chamber 2 of the caisson 1, the ground G at the bottom of the caisson 1 is excavated, and the caisson 1 is press-fitted by the press-fitting jack 42 using the anchor material 40 as a reaction force to be sunk. After the caisson 1 is press-fitted and sunk, the press-fitting reaction force girder 41 on the upper part of the caisson 1 is removed to construct the caisson upper part. Repeating the above steps 1 to 3, the caisson structure is laid deep underground.

[0004]

However, the above-mentioned prior art has a problem that it takes a lot of time and labor to construct and remove the press-fitting reaction force girder 41. Therefore, the press-fitting reaction force girder 41 must be removed. For example, there is a problem that the upper part of the caisson cannot be constructed after the caisson 1 is press-fitted. Further, since the anchor material 40 is arranged outside the caisson 1, there is also a problem that it is necessary to perform a difficult work outside the caisson.

The present invention has been made in view of the above circumstances. An object of the present invention is to utilize the advantage of the construction method in which an anchor material is used as a reaction force for caisson press-fitting, and to construct a reaction force girder for press-fitting. ， The caisson press-fitting and digging work can be performed inside the caisson without the need for removal work, and even if it is adopted for the pneumatic caisson press-fitting and digging, the anchor material can be inserted through the anchor material hole provided in the work chamber slab. It is to provide a press-fit caisson that can accurately prevent air leakage.

Another object of the present invention is to provide a press-fit caisson which can be press-fitted and sunk without being affected by the water load for sinking the caisson.

Further, another object of the present invention is to provide a press-fit caisson which can secure a working space at atmospheric pressure for operating the press-fitting jack above the working chamber slab even if it is adopted for press-fitting and sinking of a pneumatic caisson. To provide.

[0008]

In order to achieve the above-mentioned object, the present invention provides a plurality of anchor passage holes 4 in a working chamber slab 3 of a caisson 1 at predetermined intervals.
The anchor members 5 arranged in the same number as the holes 4 and having the lower end portions fixed to the ground G are passed through the holes 4, and a filler is injected into the gap between the holes 4 and the anchor members 5 for sealing. A closed anchor threading device 7 is provided, and a press-fitting jack 25 is provided on the working chamber slab 3 so as to correspond to the anchor material 5.
The anchor material 5 is connected to the press-fitting jack 25 and the ground material G at the bottom of the working chamber 2 of the caisson 1 is excavated while the press-fitting jack 25 uses the anchor material 5 as a reaction force to move the caisson 1 to the ground G. It is press-fitted so that it can be sunk.

In order to achieve the above object, the present invention is a press-fit caisson that utilizes a water load when the caisson 1 is sunk. The press-fit jack 25 is surrounded by an open shaft 30 or a shield tunnel 31, and a press-fit shaft is provided. The working space for 25 operations is secured.

Further, in order to achieve the above object, according to the present invention, a plurality of holes 4 for anchor passage are provided in the working chamber slab 3 of the caisson 1 at predetermined intervals, and the holes 4 are arranged in the same number. An anchor material 5 having a lower end portion fixed to the ground G is penetrated through the holes 4 and a filler is injected into the space between the holes 4 and the anchor material 5 to seal the anchor material. And a press-fitting jack 25 is installed on the working chamber slab 3 so as to correspond to the anchor material 5.
The anchor material 5 is connected to the press-fitting jack 25, and a partition slab 34 is formed in an upper part of a space where the press-fitting jacks 25 are installed in parallel with the work chamber slab 3. Between 34, press-fitting jack 2
5 is provided with a working space 35 for operation, and while excavating the ground G at the bottom of the working chamber 2 of the caisson 1, the caulson 1 is pressed into the ground G by using the anchor material 5 as a reaction force by the press-fitting jack 25 so that the caisson 1 is sunk. It is the one.

[0011]

In the present invention, a plurality of anchor members 5 whose lower ends are fixed to the ground G are passed through the work chamber slab 3 of the caisson 1. Further, a press-fitting jack 25 is installed on the work chamber slab 3 so as to correspond to the anchor material 5, and the anchor material 5 is connected to the press-fitting jack 25. Then, while excavating the ground G at the bottom of the working chamber 2 of the caisson 1, the press-fitting jack 2
The caisson 1 is press-fitted into the ground G by using the anchor material 5 as a reaction force by 5 and is sunk.

In this way, the anchor material 5 is attached to the work room slab 3
Since the caisson 1 is press-fitted and sunk by using the anchor material 5 as a reaction force, it is not necessary to erection and remove the press-fitting reaction force girder, and the work efficiency is improved accordingly.
In addition, labor saving can be achieved, and immediately after the sunk, the construction of the upper part of the caisson can be started.

Further, since the press-fitting and sinking operations of the caisson 1 can all be performed inside the caisson, it is possible to carry out close construction to other structures.

Moreover, the advantage of the construction method in which the caisson 1 is press-fitted and sunk by using the anchor material 5 as a reaction force, that is, since it is possible to control the scavenging even in deep depth excavation or even on soft ground, the construction accuracy is improved and the process control is ensured. What you can do, by pressing in the pneumatic caisson, you can suppress the retraction of the surrounding ground that had occurred when the caisson subsided, so you can suppress the subsidence of the surrounding ground, the hard sand layer,
It is possible to take advantage of the advantage that the pressure in the gravel layer can be applied with the least amount of excavation.

Further, according to the present invention, a hole 4 for passing an anchor material is opened in the work chamber slab 3 and a filler such as grease is injected into the space between the hole 4 and the anchor material 5 to seal it.

Thus, when the pneumatic caisson is press-fitted and sunk, compressed air can be properly prevented from leaking from the hole 4 through which the anchor material is opened, which is opened in the work chamber slab 3, and can be accurately prevented from the hole 4. It is possible to prevent noises such as whistling noise caused by air leaks.

Further, according to the present invention, in the press-fitting caisson which utilizes a water load when the caisson 1 is sunk, the work space for operating the press-fitting jack 25 is surrounded by surrounding the press-fitting jack 25 with the open shaft 30 or the shield tunnel 31. I try to secure it.

Thus, the press-fitting jack 25 can be operated to perform the press-fitting and sinking work of the caisson 1 without being affected by the water load for caisson sinking, and the press-fitting jack 2 can be carried out.
The operation of 5 can be performed under atmospheric pressure, and the worker can be relieved from the troublesome work.

Further, according to the present invention, the press-fitting jack 2 is used.
A partition slab 34 is formed in the upper part of the space in which the work chamber 5 is installed in parallel with the work chamber slab 3, and a work space 35 for operating the press-fitting jack 25 is provided between the work chamber slab 3 and the partition slab 34. ing.

As a result, when the pneumatic caisson is press-fitted, the press-fitting jack 25 is provided above the working chamber slab 3.
It is possible to secure an atmospheric pressure working space 35 for the operation.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show a first embodiment of the present invention applied to a pneumatic caisson. FIG. 1 is a vertical sectional front view, FIG. 2 is a plan view, and FIG. 3 is a detail of part A of FIG. FIG.

In the first embodiment shown in these figures, a working chamber 2 and a working chamber slab 3 are formed below the caisson 1.

In this embodiment, the working chamber slab 3 is provided with four holes 4 for passing anchor material at equal intervals in the circumferential direction. An anchor material 5 is passed through each hole 4. Further, a press-fitting jack 25 is installed on the work chamber slab 3 at a position corresponding to each hole 4 for passing the anchor material.

The anchor material 5 is made of PC steel wire or PC.
A steel rod or the like is used. The bottom end of each anchor material 5 is fixed to the ground G via an anchor body 6. Further, each anchor material 5 is penetrated through the working chamber slab 3 through the hole 4 and is then connected to the press-fitting jack 25 through the anchor material fixing hardware 26.

The space between the hole 4 for passing the anchor material and the anchor material 5 is sealed by a closed anchor threading device 7. This closed anchor passing device 7 includes grease tanks 8 and 9 provided at the upper and lower portions of the work chamber slab 3, a packing 14 having a flat portion 14a and a sleeve portion 14b, and a flat portion 15a and a sleeve portion 15 as well.
Packing 15 having b, tube 22 accommodated in hole 4 for passing anchor material, and grease 24 as filler.
And is equipped with. The grease tank 8 has a flat portion 14 of the packing 14 between the grease tank 8 and the upper surface of the work chamber slab 3.
It is fixed by a mounting bracket 10 and a mounting bolt 12 with a in between. The gap between the anchor material 5 and the upper end of the grease tank 8 is closed by another packing 16, and this packing 16 is fixed to the grease tank 8 by a seat plate 18 and a mounting bolt 20. The grease tank 9 is fixed between the lower surface of the work chamber slab 3 and the flat portion 15a of the packing 15 by a mounting bracket 11 and a mounting bolt 13. The gap between the anchor material 5 and the lower end of the grease tank 9 is closed by another packing 17, and the packing 17 is fixed to the grease tank 9 by a seat plate 19 and a mounting bolt 21. The sleeve portion 14b of the packing 14 has a grease tank 8
It is arranged inside and contacts the outer peripheral surface of the anchor material 5 passing through the inside of the grease tank 8 to seal this portion. The sleeve portion 15b of the packing 15 is arranged in the grease tank 9, and the anchor member 5 passing through the grease tank 9
Is in contact with the outer peripheral surface of and seals this part. The tube 22 is formed of an elastic material such as rubber,
It is housed in a hole 4 through which the anchor material is provided in the work chamber slab 3, and when the grease 24 is filled, it comes into close contact with the peripheral wall of the hole 4. The grease tank 9 is provided with a nipple 23. This nipple 23
Is connected to a grease supply device (not shown),
Through this nipple 23, the grease 24 is supplied, filled and sealed in the grease tank 9, the tube 22 and the grease tank 8.

The press-fitting jack 25 is adapted to press-fit the caisson 1 using the anchor material 5 as a reaction force and to sink it.

The press-fit caisson according to the first embodiment is
It is laid down as follows.

First, the place where the caisson 1 should be sunk is dug up, and the caisson 1 is installed.

A tube 22 of a closed anchor threading device 7 is housed in each hole 4 for anchor material passage provided in the working chamber slab 3 of the caisson 1 in advance, and a sleeve portion 14b is provided on the upper surface of the working chamber slab 3. The packing 14 and the grease tank 8 having the above are attached by the attachment fitting 10 and the attachment bolt 12, and the packing 15 having the sleeve portion 15b and the grease tank 9 are attached by the attachment fitting 11 and the attachment bolt 13 to the lower surface of the work chamber slab 3.

Then, the anchor material 5 is inserted into each of the holes 5 for passing the anchor material and the closed anchor threading device 7 attached to the hole, and the work material slab 3 is penetrated. Then, a hole for fixing the anchor material is excavated in the ground G, the anchor material 5 is inserted into the hole, and the lower end portion of the anchor material 5 is fixed via the anchor body 6.

Further, the gap between the anchor material 5 and the upper end portion of the grease tank 8 is closed by the packing 16 attached by the seat plate 18 and the mounting bolt 20, and the anchor material 5 and the lower end portion of the grease tank 9 are closed. Packing 1 in which the gap is attached by a seat plate 19 and attachment bolts 21
Block at 7.

Next, the grease 24 is supplied and filled into the grease tank 9, the tube 22 and the grease tank 8 through the nipple 23 provided in the grease tank 9. As a result, the part of the anchor material 5 that passes through the grease tanks 8 and 9 is the grease 24 and the grease 2
Packing 1 adhered to the outer peripheral surface of the anchor material 5 by the pressure of 4
The portion of the anchor material 5 that is sealed by the sleeve portions 14b and 15b and that passes through the tube 22 is also filled with grease 24, and the tube 22 is closely attached to the peripheral wall surface of the hole 4, It is sealed with the grease 24 that has been removed. When the pressure of the grease 24 in the closed anchor passing device 7 drops during the process of press-fitting and sinking the caisson 1, the grease 24 is replenished through the nipple 23.

Next, a press-fitting jack 25 is installed at a position on the work chamber slab 3 corresponding to the hole 4 for passing the anchor material, and the press-fitting jack 25 is fitted with the anchor material fixing hardware 2.
The anchor member 5 is connected via 6.

As described above, after setting each member in the caisson 1, the ground G at the bottom of the working chamber 2 of the caisson 1 is excavated by hand or machine excavation, and the excavated soil is caisson shaft 28 and caisson lock. It is transported to the ground through 27 and is discharged.

After excavating the ground G in the working chamber 2 of the caisson 1, the caulson 1 is press-fitted by the press-fitting jack 25 using the anchor material 5 as a reaction force to be sunk.

After the caisson 1 is sunk, the caisson upper part 1'is constructed.

Then, the ground G at the bottom of the above-mentioned working chamber 2
Work for excavating the anchor material 5 by the press-fitting jack 25
Using the reaction force as a reaction force, the caisson 1 is press-fitted, the caisson 1 is press-fitted and set down, and then the work for constructing the caisson upper part 1 ′ is repeated, and the caisson structure is set deep underground.

According to the first embodiment described above, the anchor material 5 is passed through the working chamber slab 3 and the anchor material 5 is
Since the caisson 1 is press-fitted and sunk by using as a reaction force, it is not necessary to erection and remove the press-fitting reaction force girder, and work efficiency can be improved and labor can be saved accordingly. Immediately after the installation, the caisson upper part 1'can be constructed.

Further, since the press-fitting and sinking operations of the caisson 1 can all be carried out inside the caisson, it is possible to carry out close construction to other structures.

Moreover, the advantage of the construction method in which the caisson 1 is press-fitted and sunk by using the anchor material 5 as a reaction force, that is, since the sinking control can be performed even in deep-depth excavation and even on soft ground, the construction accuracy is improved and the process control is ensured. What you can do, by pressing in the pneumatic caisson, you can suppress the retraction of the surrounding ground that had occurred when the caisson subsided, so you can suppress the subsidence of the surrounding ground, the hard sand layer,
It is possible to take advantage of the advantage that the pressure in the gravel layer can be applied with the least amount of excavation.

Further, a grease tank 8 is provided above the hole 4 for passing the anchor material in the work chamber slab 3, a packing 14 having a sleeve portion 14b which can be adhered to the outer peripheral surface of the anchor material 5, the anchor material 5 and the grease. A packing 16 for closing the gap between the upper ends of the tanks 8 is provided, and a tube 22 that can be adhered to the peripheral wall surface of the hole 4 for passing the anchor material is provided.
Between the anchor material 5 and the lower end portion of the grease tank 9, the grease tank 9 in the lower portion of the hole 4 for passing the anchor material, the packing 15 having the sleeve portion 15b that can be adhered to the outer peripheral surface of the anchor material 5, Since a seal 17 for closing the space of the pneumatic caisson is provided, and a seal type anchor threading device 7 filled with grease 24 is provided over the inside of the grease tank 9, the tube 22 and the grease tank 8, when the pneumatic caisson is press-fitted or sunk. It is possible to accurately prevent the compressed air from leaking from the hole 4 for passing the anchor material provided in the work room slab 3 and to prevent the noise such as the whistling sound caused by the leak from the hole 4. be able to.

Next, FIG. 4 is a vertical sectional front view showing a second embodiment of the present invention, and FIG. 5 is a plan view of FIG.

The second embodiment shown in FIGS. 4 and 5 is applied to a construction method in which a water load is used for sinking the caisson 1, and is used for operating the press-fitting jacks 25 around each press-fitting jack 25. The open shaft 30, which is a facility for securing the working space of, is installed. This open shaft 30 is used for the work chamber slab 3 in the caisson 1.
It is formed to have a height higher than the load water 29 injected into the upper space of the above, and surrounds the press-fitting jack 25 to secure a working space for operating the press-fitting jack 25.

As a result, the press-fitting jack 25 can be operated to carry out the press-fitting and sinking work of the caisson 1 without being affected by the water load for caisson sinking, and the press-fitting jack 2 can be carried out.
The operation of 5 can be performed under atmospheric pressure, and the worker can be relieved from the troublesome work.

The other structure and operation of the second embodiment are the same as those of the first embodiment.

Further, FIG. 6 is a vertical sectional front view showing a third embodiment of the present invention, and FIG. 7 is a plan view of FIG.

The third embodiment shown in FIGS. 6 and 7 is also applied to the construction method in which the water load is used to sunk the caisson 1, and is used for operating the press-fitting jacks 25 to which four press-fitting jacks 25 are applied. It is surrounded by a shielding tunnel 31 which is a facility for securing the working space of. The shielding tunnel 31 secures a working space for operating the press-fitting jack 25 that is not affected by the load water 29.

In the shielding tunnel 31, the man lock 3
2 and the man shaft 33 are connected in series so that an operator can move in and out of the shield tunnel 31 through the man lock 32 and the man shaft 33.

Also in this third embodiment, the press-fitting jack 25 can be operated to perform the press-fitting and sinking work of the caisson 1 without being affected by the water load for caisson sinking, and the press-fitting jack 25 can be operated largely. It can be performed under atmospheric pressure, and the worker can be relieved from laborious work.

The other structure and operation of the third embodiment are similar to those of the first embodiment.

Next, FIG. 8 is a vertical sectional front view showing the fourth embodiment of the present invention.

In the fourth embodiment shown in FIG. 8, a partition slab 34 is formed in parallel with the work chamber slab 3 in the upper part of the space where the press-fitting jack 25 is installed. A work space 35 for operating the press-fitting jack 25 is provided between the slabs 34.

A caisson lock 27 and a caisson shaft 28 are connected to the upper part of the partition slab 34 to convey excavated earth and sand through these facilities, or a working space for a worker to operate the press-fitting jack 25. It is configured so that it can enter and leave 35.

Also in the fourth embodiment, it is possible to secure an atmospheric working space 35 for operating the press-fitting jack 25 in the pneumatic caisson.

The other structure and operation of the fourth embodiment are the same as those of the first embodiment.

The present invention is not limited to the illustrated embodiment in which four anchor members 5 are provided. The specific structure of each part is
The structure is not limited to the first, second, third, and fourth embodiments, and may be any structure that can exhibit the desired function.

[0058]

As described above, according to the first aspect of the present invention.
In the invention described, a plurality of anchor members 5 arranged at a predetermined interval from each other and having their lower end portions fixed to the ground G are passed through the work chamber slab 3 of the caisson 1, and the anchor members are placed on the work chamber slab 3. 5, the press-fitting jack 25 is installed, the anchor material 5 is connected to the press-fitting jack 25, and the anchor material 5 is removed by the press-fitting jack 25 while excavating the ground G at the bottom of the working chamber 2 of the caisson 1. As a reaction force, the caisson 1 is pressed into the ground G and is sunk. The anchor material 5 is penetrated through the work chamber slab 3, and the anchor material 5 is used as a reaction force to press the caisson 1 and set it down. Since there is no need to install and remove the reaction force girder for press-fitting, there is an effect that work efficiency can be improved and labor saving can be achieved by that amount, and press-fitting and sinking work of caisson 1 must be performed inside the caisson. In Therefore, there is an effect that it can be installed close to other structures, and the advantage of the construction method in which the caisson 1 is press-fitted and sunk by using the anchor material 5 as a reaction force, that is, even in deep-depth drilling and soft ground Because you can control
Construction accuracy is improved, process control can be ensured, and by pressing in the pneumatic caisson, it is possible to suppress the pulling in of the surrounding ground that had occurred at the time of subsidence of the conventional caisson, so it is possible to suppress the subsidence of the surrounding ground,
There is also an effect that the advantage that the pressure in the hard sand layer and the gravel layer can be applied by the minimum excavation can be utilized as it is. Further, in the present invention, a closed anchor threading device 7 for injecting and sealing a filling material into a space between the anchor material threading hole 4 provided in the work chamber slab 3 and the anchor material 5 penetrating therethrough.
Since it is provided, there is an effect that it is possible to accurately prevent the leakage of compressed air from the hole 4 through which the anchor material is provided in the working chamber slab 3 when the pneumatic caisson is press-fitted and sunk. There is also an effect that noise such as whistling sound caused by concern can be prevented.

According to the second aspect of the present invention, in the press-fitting caisson that utilizes a water load when the caisson 1 is sunk, the press-fitting jack 25 is surrounded by the open shaft 30 or the shield tunnel 31, and the press-fitting jack is provided. Since the working space for the operation of the caisson 25 is secured, there is an effect that the press-fitting jack 25 can be operated and the caisson 1 can be press-fitted and sunk without being affected by the water load for caisson sunk. The operation of the press-fitting jack 25 can be performed under the atmospheric pressure, which has the effect of relieving the worker from laborious work.

Further, in the invention according to claim 3 of the present invention, a partition slab 34 is formed in parallel with the work chamber slab 3 in the upper part of the space in which the press-fitting jack 25 is installed,
Since the working space 35 for operating the press-fitting jack 25 is provided between the work chamber slab 3 and the partition slab 34, the press-fitting jack 25 is also provided in the pneumatic caisson.
There is an effect that the working space 35 of atmospheric pressure for the operation of can be secured.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing a first embodiment of the present invention.

FIG. 2 is a plan view of FIG.

3 is an enlarged cross-sectional view showing details of a portion A in FIG.

FIG. 4 is a vertical sectional front view showing a second embodiment of the present invention.

FIG. 5 is a plan view of FIG.

FIG. 6 is a vertical sectional front view showing a third embodiment of the present invention.

FIG. 7 is a plan view of FIG. 6;

FIG. 8 is a vertical sectional front view showing a fourth embodiment of the present invention.

FIG. 9 is a vertical sectional front view showing a conventional technique.

FIG. 10 is a plan view of FIG.

[Explanation of symbols]

 1 Caisson 2 Caisson work room 3 Work room slab 4 Hole for anchor material passing 5 Anchor material 6 Anchor body fixing anchor material G Ground 7 Sealed anchor threading device 8, 9 Grease tank of sealed anchor threading device 14, 15 Seal packing for anchor type anchoring device 14a, 15a Flat part for same packing 14b, 15b Sleeve part for same packing 22 Tube for sealing type anchoring device 24 Grease for sealing type anchoring device 25 Jack for press fitting 26 Jack for press fitting Anchor fixing hardware to 29 29 Water load 30 Open shaft surrounding the press-in jack 31 Shield tunnel surrounding the press-in jack 32 Manlock connected to the shield tunnel 33 Man shaft connected to the shield tunnel 34 Compartment slab 35 Work space for operation of press-fitting jack

Claims (3)

[Claims] 1. A plurality of holes 4 for anchor passage are provided in a work chamber slab 3 of a caisson 1 at a predetermined interval from each other, and the holes 4 are arranged in the same number and the lower end portion is fixed to a ground G. The anchor material 5 is penetrated through the holes 4, and a sealed anchor threading device 7 for injecting and sealing a filler is provided in the space between each hole 4 and the anchor material 5, and the work chamber slab 3 is provided with the above-mentioned structure. The press-fitting jack 25 is installed corresponding to the anchor material 5, and the anchor material 5 is attached to the press-fitting jack 25.
The caisson 1 is press-fitted into the ground G by using the anchor material 5 as a reaction force by the press-fitting jack 25 while excavating the ground G at the bottom of the working chamber 2 of the caisson 1, and the caisson 1 is sunk. 2. In a press-fitting caisson that utilizes a water load when the caisson 1 is sunk, the press-fitting jack 25 is surrounded by an open shaft 30 or a shield tunnel 31 to secure a working space for operating the press-fitting shaft 25. The press-fit caisson according to claim 1, characterized in that 3. The working chamber slab 3 of the caisson 1 is provided with a plurality of holes 4 for passing anchors at predetermined intervals, and the holes 4 are arranged in the same number as the holes 4 and the lower end portion is fixed to the ground G. The anchor material 5 is penetrated through the holes 4, and a sealed anchor threading device 7 for injecting and sealing a filler is provided in the space between each hole 4 and the anchor material 5, and the work chamber slab 3 is provided with the above-mentioned structure. The press-fitting jack 25 is installed corresponding to the anchor material 5, and the anchor material 5 is attached to the press-fitting jack 25.
And a partition slab 34 parallel to the work chamber slab 3 in the upper part of the space where these press-fitting jacks 25 are installed.
Between the working chamber slab 3 and the partition slab 34,
A working space 35 for operating the press-fitting jack 25 is provided, and while excavating the ground G at the bottom of the working chamber 2 of the caisson 1, the caulson 1 is press-fitted into the ground G using the anchor material 5 as a reaction force by the press-fitting jack 25, A press-fit caisson characterized by being sunk.