JPH07233532A - Caisson method - Google Patents

Abstract

PURPOSE:To execute the settlement and control of a caisson artificially according to a schedule to promote settlement accuracy and safety in a caisson method. CONSTITUTION:The inside of a caisson 1 as the foundation of a building prefabricated on the ground is excavated, at the same time, the caisson 1 is settled by adding loading with an earth anchor 3 fixed to a bearing floor 2, and the settlement is made by bringing a bearing plate 4 into contact with an excavated bottom surface 5. The settlement attitude, settlement speed, general resistance force and parameter, etc., indicating the influence to the peripheral environment are automatically measured by various kinds of measuring devices, and the measuring data is processed with a data processing device 6 in a control room 6 and is indicated on a display of a personal computer 6b, so that it is executed while making sure of it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submarine method for submerging foundations and underground parts such as bridge piers, septic tanks and buildings which have been prefabricated above ground to a predetermined depth.

[0002]

2. Description of the Related Art In general, a submarine construction method in which a bridge pier, a septic tank, and a caisson, which is a foundation of a building, which are prefabricated on the ground are sunk to a predetermined depth is performed by the method shown in FIG.

This is to construct a caisson 40 provided with a support floor 20 and a blade 30 on the ground, excavate the inside ground surrounded by the blade 30 with an excavator such as a clamshell, and use its own weight or an earth anchor. It is the one that sinks to the depth of the support ground by the pushing force of 50 etc.

When the caisson 40 is to be settled, the soil around the blade 30 is removed by its own weight or the ground anchor 50. The means for stopping the sedimentation is the amount of soil around the blade, that is, the resistance of the soil. It was only due to.

[0005]

As described above, in the conventional submarine construction method, the only means for stopping the caisson settling is by the resistance of the soil around the cutting edge. Therefore, the caisson settling control is artificially and systematically performed. Therefore, the sedimentation accuracy and its safety could not be improved. The present invention has been made in view of such a problem, and an object thereof is to artificially and systematically control sedimentation of caisson in a submersible construction method to enhance sedimentation accuracy and its safety.

[0006]

The submersible method of the present invention for achieving the above object is to provide a bearing plate along the inner peripheral surface of the blade opening of the caisson, and to support the bearing plate according to the sinking of the caisson. The caisson is sunk while moving up and down and making contact with the bottom of the excavation.The bearing plates are subdivided and each operates independently, and the bearing plates are removable from the inner peripheral surface of the blade opening. The configuration is characterized by

[0007]

[Operation] The bearing plate provided on the inner surface of the caisson is moved up and down in accordance with the sinking of the caisson to bring the caisson into contact with the bottom of the excavation to allow the caisson to settle artificially and systematically. Therefore, the sedimentation accuracy and its safety can be improved. Further, since the bearing plate is subdivided into a large number and each can independently operate, the caisson can be settled in a well-balanced manner by finely controlling these.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the submersible method of the present invention will be described in detail below with reference to the drawings. 1 is a longitudinal sectional view of a caisson showing a submersible method of the present invention, FIG. 2 is a lateral sectional view thereof, FIG. 3 is a perspective view of a bearing plate at a blade opening portion, and FIG. 4 is a fitting between the bearing plate and the blade opening portion. It is sectional drawing which shows a state.

As shown in FIG. 1, the submersible construction method of the present invention excavates the inside of a caisson 1 which is a foundation of a building manufactured on the ground in advance, and applies a loading load with an earth anchor 3 fixed to a support floor 2. By doing so, the caisson 1 is settled, and this settling is performed while the bearing plate 4 is in contact with the excavation bottom surface 5.

For the subsidence of the caisson 1, the subsidence posture and the subsidence speed, the total resistance of soil, the parameters indicating the influence on the surrounding environment, etc. are automatically measured by various measuring instruments, and the measured data are stored in the control room 6. Since the data is processed by the data processing device 6a and displayed on the screen of the personal computer 6b, the process is performed while checking it.

The pressure support plate 4 having a proper size is continuously provided along the inner peripheral surface of the blade opening portion 7 of the caisson 1, and the rollers 8 projecting from each pressure support plate 4 are provided with the blade opening portion 7. Is inserted in the guide rail 9 of.

Therefore, each pressure bearing plate 4 is a hydraulic cylinder 4 on the upper surface.
It is configured to move up and down along the guide rail 9 by a, and its operation is remotely operated from the controller 6c in the control room 6.

Each of the pressure bearing plates 4 operates independently and supports the caisson 1 by abutting it on the excavation bottom surface 5 of the blade opening 7 when the caisson 1 is settled.

The pressure support plate 4 can be removed from the blade opening 7 by pulling out the roller 8 from the guide rail 9.

Next, the work procedure of this submarine construction method will be described. First, the caisson 1 provided with the bearing plate 4 is installed at a predetermined position, the tip of the tension member 10 is driven into the support base, and the rear end thereof is inserted into the tension jack 11 of the support floor 2 of the caisson 1. To form the ground anchor 3. In this case, the bearing plate 4 is in a state of being contracted upward as shown in FIG.

Next, the ground inside the caisson 1 below the support floor 2 is sequentially excavated by a backhoe or the like, and the excavated soil is discharged to the ground by a clamshell or the like. Then, the earth and sand around the blade opening portion 7 in which the bearing plate 4 is contracted is removed as shown in (1) and (2) of FIG.

Then, in this state, as shown in (3) of the same figure, the hydraulic cylinder 4a is extended to bring the pressure bearing plate 4 into contact with the bottom surface of the excavation, and the tension jack 11 is operated to operate the caisson 1 with the earth anchor 3. Add a load to.

Then, in accordance with the addition of the applied load, the bearing plate 4
The caisson 1 is allowed to settle by controlling the settling speed by operating the.

The operation of the bearing plate 4 and the tension of the earth anchor 3 are automatically controlled by the controller 6c based on the measured data such as the sinking attitude and the sinking speed of the caisson 1. Further, the operation of the pressure bearing plate 4 can be manually operated by an operator while confirming the sinking posture and the sinking state of the caisson 1 displayed on the screen of the personal computer 6b.

This settling method is shown in FIG.
When the side is to be settled, the support plates 4 on the A side are all pulled up, and the support plates 4 on the B, C, and D sides are installed.
Are all in contact with the excavation bottom surface 5.

Then, depending on the tension of the earth anchor 3, A
By simultaneously pulling up the support plates 4 on the sides to the upper side, A
Let the side settle. In this case, the pressure-bearing plates 4 on the side A can be divided into groups of 2 or 3 or more, and these groups can be operated alternately. Further, instead of operating the pressure bearing plates 4 in groups as described above, it is possible to operate each independently.

As described above, the pressure bearing plates 4 can be operated in groups or independently of each other, whereby the caisson can be settled down more finely than before. Further, the pressure support plates 4 may be installed at predetermined intervals depending on the properties such as the strength of the ground and the size of the caisson, instead of being provided on all sides of the caisson as described above.

When the caisson 1 is submerged up to the supporting ground or the supporting pile while the sides are sequentially settled by the above-mentioned method, the ground around the bearing plate 4 is further excavated, and
The roller 8 is pulled out from the guide rail 9 and the pressure bearing plate 4 is removed from the blade opening 7.

In the present embodiment, the submarine construction method of the present invention has been described on the basis of the foundation of the building, but this is not limited to the foundation of the building, and can be applied to piers and septic tanks. You can

[0025]

EFFECTS OF THE INVENTION By providing a bearing plate along the inner peripheral surface of the blade opening of the caisson and moving the bearing plate up and down in accordance with the sinking of the caisson to bring the caisson into contact with the excavation bottom surface, the caisson is sunk. Since sedimentation can be controlled artificially and systematically, sedimentation accuracy and its safety can be improved.

The caisson can be settled in a well-balanced manner by finely controlling the pressure-bearing plates that are subdivided into a large number and each can operate independently.

By making the pressure bearing plate removable from the inner peripheral surface of the blade opening, the caisson can be easily installed on the supporting ground or the supporting pile.

By making the pressure bearing plate removable from the inner peripheral surface of the blade opening, the pressure bearing plate can be easily replaced and the size of the pressure bearing plate can be arbitrarily changed.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a caisson in a submarine method of the present invention.

FIG. 2 is a cross-sectional view of a caisson.

FIG. 3 is a perspective view of a bearing plate showing an attached state at a blade opening portion.

FIG. 4 is a sectional view of a bearing plate fitted to a guide rail of a blade opening.

FIG. 5 is a vertical cross-sectional view of a caisson with a compressed support plate.

6 (1), (2), and (3) are cross-sectional views of the blade opening portion showing the operation of the pressure bearing plate.

FIG. 7 is a conceptual diagram showing a method of operating a support plate.

FIG. 8 is a vertical cross-sectional view of a caisson showing a conventional submarine construction method.

[Explanation of symbols]

 1 Caisson 2 Support Floor 3 Earth Anchor 4 Bearing Plate 5 Excavation Bottom 6 Control Room 7 Blade

Claims (3)

[Claims] 1. A pressure support plate is provided along the inner peripheral surface of the blade opening of the caisson, and the pressure support plate is moved up and down in accordance with the sinking of the caisson to abut the excavation bottom surface to lower the caisson. The submersible method. 2. The submarine construction method according to claim 1, wherein the bearing plates are subdivided and each independently operates. 3. The submarine construction method according to claim 1, wherein the bearing plate is removable from the inner peripheral surface of the blade opening.