JP2004137685A - Caisson submergement method and supporting method using regular foundation pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a caisson suspending apparatus for dispensing with an earth anchor, submerging a caisson frame body with high accuracy, improving the stability of jacking work, and overcoming an disadvantage such as the imbalance of a support force in bedding work for bottom-seating the ground at the final stage of the submergement of the caisson frame body. <P>SOLUTION: In a process of applying pressure to an open caisson by a hydraulic jack 7 submerged to a designated depth in a predetermined position, an intermediate connection pile (a reaction force pile) 2 is erected as a rigid support member from a regular foundation pile 1 driven in an area for submerging the caisson, and the intermediate connection pile 2 is connected to the hydraulic jack 7, whereby the regular foundation pile 1 can be used for a jacking reaction force material for the submergement of the caisson 4. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a method of constructing an open caisson in the field of civil engineering, and more particularly to a caisson laying method and a supporting method using a permanent foundation pile.
[0002]
[Prior art]
Conventionally, the method of constructing the substructure (footing) by the pile foundation method is to first install the required foundation pile that is to be permanently installed, then perform temporary earth retaining work, and then excavate to the top of the permanent foundation pile. After excavation, the general procedure is to build a substructure.
[0003]
In addition, the conventional open caisson submersion technology installs a required amount of ground anchoring material, such as a ground anchor, on the outer periphery slightly away from the caisson body, and sets up the caisson by using the anchor as ground reaction force. The method is commonly used.
[0004]
Further, as a method for suppressing the lateral movement of the caisson, there is a technique in which a dedicated stake or the like is separately installed near the caisson for lateral movement, and this is used as an immovable member to serve as a guide when the caisson is laid down.
[0005]
According to the pile foundation method in the prior art, the temporary soil retaining work for constructing the substructure requires a certain period of construction time, and the temporary material used for the temporary soil retaining work after the construction of the substructure is completed. Not only requires a period of time to remove the temporary material, but also it is difficult to completely remove the temporary material.
[0006]
In addition, the conventional technology for open caisson construction is based on the premise that anchoring materials such as ground anchors are installed in advance, and although it depends on the soil conditions at the construction site and the weight of the caisson frame, etc. In such cases, it is easier to increase the apparent caisson body weight by increasing the apparent caisson body weight by using press-fitting as an auxiliary construction method or installing a weight etc. on the upper part of the caisson body, and improving the construction accuracy It is a necessary condition.
[0007]
From the above, not only the construction period required for the installation of anchoring materials such as ground anchors and the appropriate occupied construction area, but also the expenses required for anchoring materials and weights are burdened, and environmental problems in the construction business were addressed. In the meantime, it is difficult for the ground anchor to completely remove the anchorage part, and it is a problem that complete removal requires additional construction time and cost.
[0008]
As an improved technique for solving the above problems, an underground skeleton construction method disclosed in JP-A-6-341154 is known. In this prior art, the earth anchor (grand anchor) is driven into an area where a caisson is to be laid, instead of a method in which an earth anchor (grand anchor) is connected to an anchor body installed separately from a foundation pile. In this way, the tension that can be obtained from the foundation pile can be obtained even when the caisson frame is laid down, and the construction period can be shortened.
[0009]
[Patent Document 1]
JP-A-6-341154
[0010]
[Problems to be solved by the invention]
However, in the prior art disclosed in Japanese Patent Application Laid-Open No. 6-341154, a caisson body can be laid by taking jack reaction force by an earth anchor integrally connected to a foundation pile. Or, because it is made of a small-diameter rod or the like and does not have rigidity itself, it can function as a reaction force member that suppresses horizontal movement during the work of submerging the caisson body, Later, it was not possible to function as a caisson's temporary support reaction material when constructing the caisson base, in order to suppress the inclination of the caisson body due to imbalance in the bearing capacity of the bottom ground, etc. It was difficult to settle down with high precision, and problems such as instability of press-fitting work still remained.
[0011]
Furthermore, with the conventional open caisson method, the caisson structure may be slightly tilted or settled after the caisson is settled due to imbalance in the bearing capacity of the ground at the end of caisson structure subsidence. In order to support the caisson body as a countermeasure, it is troublesome to install a caisson support device that requires a support pile separately from the earth anchor, and to install an abutment (sanddle) under the caisson partition wall. Such a method is adopted.
[0012]
An object of the present invention is to solve the above-mentioned problems and to provide a caisson laying method and a supporting method using a permanent foundation pile.
[0013]
[Means for Solving the Problems]
To achieve the above object, the present invention is configured as follows.
[0014]
In the first invention, in the process of applying pressure by a jack to sink an open caisson at a predetermined position to a predetermined depth, the rigid support member standing upright on a permanent foundation pile driven into an area where the caisson is to be settled is provided. By being connected to a jack, the rigid support member and the permanent foundation pile are used as a press-fitting reaction force material for caisson subsidence.
[0015]
According to a second invention, the permanent foundation pile according to the first invention is constructed by embedding the rigid support member in pile concrete, and corresponds to driving the permanent foundation pile at a predetermined depth. The rigid support member is exposed by sequentially shaking pile concrete from above the permanent foundation pile.
[0016]
According to a third aspect of the present invention, the rigid support member in the first or second aspect is formed of an intermediate connection pile made of H-section steel or the like, and the intermediate connection pile is used as a caisson horizontal support reaction force member. It is characterized in that lateral movement is suppressed.
[0017]
According to a fourth aspect of the present invention, the caisson is configured such that a stud is fixed to the rigid support member according to any one of the first to third aspects, and a guide roller provided on the strad is brought into contact with an inner side wall and a partition wall of the caisson. It is characterized in that the movement is restricted only in the vertical direction.
[0018]
According to a fifth aspect of the present invention, in the squatting method according to any one of the first to third aspects, after applying pressure with a jack to complete the laying of the open caisson to a predetermined position and a predetermined depth, the rigid support member and the permanent foundation pile are removed. The caisson is constructed as a caisson bottom plate, which is used as a caisson hanging holding reaction material, and the jack is rearranged to apply a lifting force to the caisson to prevent the caisson from subsidence (self-sinking).
[0019]
According to a sixth aspect of the present invention, in constructing the caisson bottom of the fifth aspect, the foundation concrete is poured into the caisson blade at substantially the same thickness as that of the caisson blade, so that the upper surface of the foundation concrete and the cut surface are substantially aligned. Then, the main foundation pile and the caisson skeleton are integrated by driving the caisson bottom plate.
[0020]
[Action]
According to the first and second aspects of the present invention, when the foundation pile or the like is a structure that supports the lower body, the lower body is previously constructed as a caisson on the ground, and the lower body is laid by the open caisson method. Since the caisson is laid by taking the reaction force of press-fitting into the foundation pile laid in the area where the caisson is to be laid and the rigid support member erected on the foundation pile, the conventional ground anchor or permanent foundation pile is used. Needless to say, a separate foundation pile dedicated to press-fitting is not required, and both the foundation pile and the rigid support member can be made to function as horizontal reaction members because both are rigid bodies. It can be performed with high precision and smoothly.
[0021]
In the third invention, the rigid support member in the first invention is constituted by an intermediate connection pile made of H-shaped steel, and this intermediate connection pile is removed from a permanent foundation pile which is previously installed prior to installation of a lower body. For example, by standing up to a height above the surface of the ground, it is possible to use a material that obtains a horizontal reaction force that suppresses lateral movement when the caisson is laid down. It can be performed accurately and smoothly.
[0022]
In the fourth invention, the guide roller of the guide roller-attached stradder fixed to the rigid support member according to the first to third inventions is brought into contact with the inner wall and the partition wall of the caisson, so that the movement of the caisson can be made to be a vertical component. Therefore, the caisson can be laid down with high precision and smoothly.
[0023]
In the fifth and sixth inventions, after the caisson has been laid down to the predetermined position and the predetermined depth (landing), the caisson bottom is constructed to suppress the excessive subsidence (self-sinking). It does not require a caisson skeletal suspension support pile, and does not require a complicated method of abutment (sandals). In addition, when constructing a caisson base, an intermediate connection that stands upright from a pre-installed permanent foundation pile The caisson can be reliably suspended and supported by using the stake, and the work is facilitated.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 4 are process diagrams of a caisson setting process of the present invention, FIGS. 5 to 8 are diagrams of a press-fitting device, FIGS. 9 to 11 are diagrams of a hanging device, and FIGS. It is shown as the corresponding figure. 12 to 16 are views of a caisson press-fitting device according to another embodiment.
[0025]
First, with reference to FIGS. 1 to 4, the construction order of caisson laying according to the present invention will be schematically described in the following steps (1) to (9).
[0026]
(1) In the first step, permanent foundation piles and intermediate connection piles are installed.
(2) In the second step, a caisson blade is installed.
(3) In the third step, a caisson body of the n-th lift is constructed.
(4) In the fourth step, a caisson press-fitting facility is installed.
(5) In the fifth step, the ground is excavated for caisson settlement.
(6) In the sixth step, caisson settlement is completed.
(7) In the seventh step, a caisson support member is installed.
(8) In the eighth step, final excavation (flooring) is performed.
(9) In the ninth step, the caisson work is completed.
[0027]
Hereinafter, the details of each of the construction steps (steps) (1) to (9) will be described.
[0028]
(1) Permanent foundation pile and intermediate connection pile installation stage (step)
With the existing technology such as the drilling method and the all casing method, the required number of cast-in-place piles are required as the permanent foundation piles 1 in the predetermined area where the caisson is to be submerged. An intermediate connection pile (reaction force pile) 2 such as an H-shaped steel material as an example of a rigid support member is erected on a basic foundation pile 1 such that the pile head 2a protrudes from a construction base surface (ground surface) 3. Install in the installed state. (See FIG. 1A)
[0029]
The intermediate connection pile 2 is embedded in the concrete 1a of the pile foundation 1a of the permanent foundation pile 1 as shown by a dotted line, and the connection pile head 2a is mounted on the construction base surface (ground surface) 3 of the permanent foundation pile 1 An intermediate connection pile 2 made of H-shaped steel is formed by projecting from the upper end, and in response to driving the permanent foundation pile 1 to a predetermined depth, pile concrete 1a is sequentially dropped from the upper part of the permanent foundation pile 1. May be configured to be exposed.
[0030]
(2) Caisson blade installation stage (step)
The cutting edge 4 a of the caisson (body) 4 is installed on the construction base surface 3. (See FIG. 1A)
[0031]
(3) Caisson body n-th lift construction stage (step)
The caisson frame 4 of the n-th lift is constructed. (N = 1, 2, 3, 4 ...)
[0032]
(4) Caisson press-fitting equipment installation stage (step)
A support plate 5 is installed on the constructed caisson frame 4, a reaction force girder 6 is temporarily installed on the support plate 5, and a hydraulic (hydraulic) jack 7 composed of a center hole jack is installed above the reaction girder 6. Then, a tension rod (gripper rod) 8 is inserted into the hydraulic jack 7 and connected to the pile head 2a of the intermediate connection pile 2 erected on the permanent foundation pile 1 to tension the hydraulic jack 7. The installation work of the press-in equipment 10 which obtains a press-in effect is performed. (See FIG. 1B)
[0033]
(5) Caisson subsidence excavation stage (step)
The caisson 4 is pressed and the ground 3a inside the caisson is excavated, and the caisson 4 is settled. (See Fig. 1C)
[0034]
At this time, at the same time, the straddles are laid laterally in the gap between the intermediate connection pile 2 and the intermediate connection pile 2 and in the gap between the intermediate connection pile 2 and the caisson body wall (or caisson body partition wall). A series of operations for installing bulkhead rollers on the strad located on the (or caisson body partition wall) are sequentially installed according to the excavation depth of the caisson, and by these means the movable range of the caisson body is restricted only in the vertical direction, In other words, by taking measures to prevent lateral movement, the caisson placement accuracy is improved. (The configuration in which the struts are provided horizontally on the intermediate connection pile 2 will be described in another embodiment shown in FIGS.
[0035]
(6) Caisson settlement completion stage (step)
The settlement of the caisson 4 and the excavation of the inner ground 3a are stopped, and the press-fitting equipment 10 is temporarily removed. (See FIG. 2A)
[0036]
The steps (3) to (5) are repeatedly performed up to a predetermined depth to complete the sinking of the caisson 4. (See FIGS. 2B and 2C)
[0037]
In the construction of the final lift of the caisson body 4, the caisson hanging support member 11 (the caisson hanging support member is not shown in FIG. 2C and is shown in FIGS. 3B and 3C) is projected upward from the caisson body 4. The excavator at that time ends the excavation of the ground 3a inside the caisson, leaving a ground with a necessary embedding length that can prevent excessive sinking (self-sinking) of the caisson frame 4 and leaving it. Thereafter, the press-fitting facility 10 is once removed. (See FIG. 3A)
[0038]
(7) Caisson support member installation stage (step)
A bearing girder 12 is installed on the pile head 2a of the intermediate connection pile 2, a reaction girder 6 is erected above the bearing girder 12, and a hydraulic jack (center hole jack) 7 is attached to the reaction girder 6. The suspension equipment 13 is installed on the upper part, and the suspension equipment 13 is installed by inserting a suspension bar (caisson suspension support member) 21 into the hydraulic jack 7. Then, the hydraulic jack 7 is tensioned to prevent the permanent foundation pile 1 and the caisson skeleton 4 using the intermediate connection pile 2 erected on the permanent foundation pile 1 as a supporting reaction material. (See FIG. 3B)
[0039]
(8) Final excavation (laying floor) stage (step)
After the measures to prevent the settlement of the caisson body 4 are completed, the ground 3a inside the caisson is excavated, and the ground with the remaining necessary depth is excavated (see FIG. 3C). Cast and floor. (See FIG. 4A)
[0040]
(9) Caisson work completion stage (step)
Pile head treatment of the permanent foundation pile 1 is performed, reinforcing bars are arranged on the concrete 15 on the floor, and then concrete is cast, and the caisson bottom 14 is constructed on the concrete 15 on the floor. The caisson bottom 14 and the caisson skeleton 4 are integrated by a mechanical joint (not shown), so that the permanent foundation pile 1 and the caisson skeleton 4 can be integrated via the caisson bottom 14, and then the hydraulic jack 7 Jack down. Further, thereafter, the caisson hanging equipment 13 is removed, and the intermediate connecting pile 2 projecting from the caisson bottom 14 is cut and removed at the surface of the caisson bottom 14, thereby completing the caisson work. (See FIG. 4B)
[0041]
Next, details of the press-fitting equipment will be described with reference to FIGS.
[0042]
FIG. 5 is a plan view in which the caisson body 4 of the second lift is constructed, and the press-fitting equipment 10 is installed therein, FIGS. 6 and 7 are cross-sectional views taken along aa and bb in FIG. 5, and FIG. 7 is a detailed view of a part c of FIG.
[0043]
As shown in each figure, the caisson 4 has, for example, a partition wall formed in a cross-sectional shape when viewed from a plane. Are installed, and two sets of reaction force girders 6 provided in parallel with each other and provided on each supporting plate 5 with a gap therebetween are provided at both ends of each reaction girder 6. A hydraulic jack 7 composed of a center hole jack is supported, and a gripper rod 8 inserted through the center of the hydraulic jack 7 is inserted into a gap 16 between a pair of reaction force girders 6 and rises.
[0044]
The center hole jack and the gripper rod 8 constituting the hydraulic jack 7 are known, and when the hydraulic jack 7 is operated, the upper and lower stopper members incorporated in the center hole jack are alternately expanded and contracted, and the gripper rod 8 is formed. The gripper rod 8 can be pulled up in a stepwise manner by sliding the tapered portion and engaging the engaging step portion, and the gripper rod 8 is pulled relatively to the intermediate connection pile 2 to which the lower end is connected. It can transmit reaction force.
[0045]
The connection between the gripper rod 8 and the intermediate connection pile 2 is made as shown in FIG. An adjusting rod 17 is connected to the lower end of the gripper rod 8, an anchor coupler 18 is attached to the adjusting rod 17, and a PC steel rod 20 is provided between the mounting bracket 19 provided at the upper end of the intermediate connection pile 2 and the anchor coupler 18. They are connected by PC steel wire. The connection structure between the gripper rod 8 and the intermediate connection pile 2 may be another known structure.
[0046]
As described above, the four hydraulic jacks 7 arranged at approximately four corners of the upper surface of the caisson 4 are operated in synchronization with each other, so that a few centimeters (2 cm) or less are provided through the intermediate connection pile 2 which is a rigid body. Caisson 4 can be press-fitted with an error of Note that a gripper rod 8 is connected to the upper end of the intermediate connection pile 2 in order to take out the pressure input of the hydraulic jack 7. The gripper rod 8 has a certain degree of rigidity. Since it is the shortest length necessary to take it out, there is no problem in that it can function as a reaction force material for lowering the caisson 4 with high accuracy in the intermediate connection pile 2 which is a rigid body.
[0047]
It is desirable that the intermediate connection pile 2 be given greater rigidity as a reaction force material at the time of caisson press-fitting. As described above, the pile concrete 1a of the permanent foundation pile 1 is constructed on the construction base surface (ground surface) 3 The intermediate connection pile 2 is buried in the pile concrete 1a, and the pile concrete a is sequentially cut to expose the intermediate connection pile 2 in response to the installation of the permanent foundation pile 1 at a predetermined depth. Is good.
[0048]
Next, FIG. 9 is a plan view in which the suspension equipment 13 is installed on the caisson frame 4 of the second lift after the subsidence is completed, and FIGS. 10A and 10B are d-d in FIG. , Ee cross-sectional view, and FIG. 11 is a detailed view of a portion f in FIG.
[0049]
In the present invention, after the subsidence of the caisson skeleton 4 of the n-th lift is completed while partially excavating the ground 3 a in the caisson skeleton 4, the caisson skeleton 4 is suspended and supported by the suspending equipment 13. As described above, the remaining excavated part is finally excavated, flooring is performed, and the caisson base 14 is constructed. A caisson suspension facility 13 is required for this operation.
[0050]
The details of the suspension equipment 13 according to the present invention are configured as follows.
[0051]
Of the plurality of intermediate connection piles 2 erected inside the caisson 4, the bearing girder 23 is provided in parallel at a predetermined interval using the pile head 2 a of the intermediate connection pile 2 at a predetermined position. A plurality of supporting plates 5 are provided on the supporting girder 23 at intervals, and two pairs of reaction force girders 6 provided in parallel with each other and provided on each supporting plate 5 are spaced apart from each other. It is provided. At both ends of each reaction girder 6, a hydraulic jack 7 composed of a center hole jack whose arrangement has been changed from that at the time of caisson sinking is supported, and a gripper rod 8 that passes through the center of the hydraulic jack 7. But stands up through the gap 16 of the pair of reaction girders 6
[0052]
Further, as shown in the figure, of the plurality of caisson 4 in which the partition wall is constructed in a cross-shaped shape when viewed from a plane, the suspension bars 21 are embedded near the four corners of the uppermost caisson 4, The upper part of the suspension 21 is projected from the upper surface of the caisson 4 by a predetermined length, and the suspension 21 and the gripper rod 8 are connected.
[0053]
The connection between the gripper rod 8 and the suspension 21 is made as follows. That is, an adjusting rod 17 is connected to a lower end of the gripper rod 8, an anchor coupler 18 is attached to the adjusting rod 17, and a PC steel rod 20 is provided between an anchoring bracket 19 provided at an upper end of the suspension bar 21 and the anchor coupler 18. And PC steel wires. The connection structure between the gripper rod 8 and the suspension 21 may be a known structure other than the above.
[0054]
The hydraulic jack (center hole jack) 7 and the gripper rod 8 are known as described above. In brief, the gripper rod 8 is a shaft body in which an engagement step portion and a tapered portion are alternately continued, and the center hole jack has a pair of upper and lower stopper members that are freely expandable and contractable and that can move up and down. . When the center hole jack is operated, the upper and lower stopper members move up and down while alternately expanding and contracting, and each stopper member slides down the tapered portion of the gripper rod 8 while expanding in diameter, and moves down while reducing the diameter. The gripper rod 8 can be pulled up in a stepwise manner by repeating the upward movement by engaging with the engagement step portion, and the rigid body can be pulled through the suspension 21 to which the lower end of the gripper rod 8 is connected. The caisson 4 can be suspended and supported by taking the supporting reaction force to the intermediate connection pile 2 which is the following.
[0055]
In a state where the caisson 4 is suspended and supported by the suspending equipment 13 (the state in which the anti-subsidence measure is completed), the ground 3a inside the caisson is excavated, and the ground where the necessary embedding length has been dug out is excavated, and the concrete for flooring is excavated. Is to be cast. (This has already been described)
[0056]
Next, FIG. 12 to FIG. 16 show another embodiment, and FIG. 12 shows that the press-fitting facility 10 is installed on the upper part of the caisson frame 4 of the second lift, and the gap between the press-fitting facility 10 and the intermediate connection pile 2 is provided. FIG. 13 is a sectional view taken along the line g-g in FIG. 12, FIG. 14A is a sectional view taken along the line hh in FIG. 12, and FIG. FIG. 14 is a detailed view of an i part of FIG.
[0057]
In this embodiment, a plurality of struts 22 made of H-shaped steel having different lengths are detachably provided on both flanges of the intermediate connection pile (reaction force pile) 2 made of H-shaped steel by bolts and nuts 24, and the end is provided. A guide roller 23 is attached to the tip of the stradd 22 located at the portion, and the guide roller 23 is rotatably pressed against the side wall of the caisson frame 4. Since the other configurations in FIGS. 12 to 16 are the same as those of the press-fitting facility 10 in FIGS. 5 to 8, the same components are denoted by the same reference numerals and description thereof will be omitted.
[0058]
In this embodiment, a series of operations for laying the stradd 22 in the gap between the intermediate connection pile 2 and the intermediate connection pile 2 and the gap between the intermediate connection pile 2 and the caisson body wall 4b or the caisson body partition wall 4c are as follows. The facilities will be installed sequentially according to the excavation depth of the caisson 4. Specifically, the straddles 22 are sequentially laid by bolting on the intermediate connection pile 2 exposed by peeling off the pile concrete 1a of the permanent foundation pile 1. Further, the guide roller 23 provided at the tip of the stradd 22 moves up and down while rotating while being pressed against the caisson body inner wall 4b and the partition wall 4c.
[0059]
The caisson skeleton 4 is constrained only in the vertical direction by the above-described guide roller-attached strad 22, and moves down smoothly. Thus, by taking measures to prevent lateral movement of the caisson skeleton 4 by using the intermediate connection pile (reaction pile) 2 which is a rigid body to which the stradd 22 is attached as a reaction material, the caisson laying accuracy is improved. be able to.
[0060]
Although the embodiments have been described above, the present invention is not limited to the illustrated examples, and may be appropriately modified and implemented within a scope of design change, and these belong to the scope of the present invention.
[0061]
【The invention's effect】
According to the caisson laying method and the supporting method using the permanent foundation pile according to the present invention, the work of temporary earth retaining in the open-cutting method can be omitted. In addition, the use of caisson press-fitting ground anchors in the open caisson method when using the press-in method and the installation work can be omitted, making it impossible or difficult to remove and install the ground anchors, and a temporary retaining work. And the cost of construction can be shortened. In addition, it is possible to press-fit the open caisson while securing the same subsidence accuracy as the conventional technology, and the caisson body can be used as the lower body in the pile foundation method, which has the effect of leading to labor-saving construction. .
[0062]
Furthermore, according to the present invention, after the caisson has been laid down to a predetermined position and a predetermined depth (landing), excessive subsidence (self-sinking) is suppressed and a caisson base is constructed. And the need for labor-intensive methods such as abutments (sandals) are no longer required. In addition, when constructing the caisson bottom, an intermediate connection pile that is erected from a preinstalled permanent foundation pile is used. This allows the caisson to be securely suspended and supported, contributing to labor saving in construction.
[0063]
In addition, under the high water level represented by river construction, in the prior art, for example, when constructing an abutment, a dry environment using a corrugated pipe or the like as a temporary deadline, the construction work was performed, According to the present invention, a temporary deadline or the like is not required by a caisson.
[0064]
Furthermore, in comparison with the caisson press-fitting method using a ground anchor or the like, by using a press-fitting device by interposing a H-section steel or the like as a reaction force member from a pre-installed foundation pile, Since it is possible to suppress the elongation of the anchor portion that appears, the workability is surely improved when jacking down and temporarily removing the press-fitting equipment when constructing the caisson frame.
[Brief description of the drawings]
FIG. 1 is a first process diagram of a caisson setting process of the present invention.
FIG. 2 is a second step diagram of the caisson setting process of the present invention.
FIG. 3 is a third process diagram of the caisson setting process of the present invention.
FIG. 4 is a fourth process diagram of the caisson setting process of the present invention.
FIG. 5 is a plan view in which a caisson body of a second lift is constructed and press-fitting equipment is installed therein.
FIG. 6 is a sectional view taken along line aa of FIG. 5;
FIG. 7 is a sectional view taken along the line bb of FIG. 5;
FIG. 8 is a detailed view of a portion c in FIG. 6;
FIG. 9 is a plan view showing a state in which suspending equipment is installed on the caisson body of the second lift after the laying is completed.
FIGS. 10A and 10B are sectional views taken along lines dd and ee of FIG. 9;
FIG. 11 is a detailed view of a part f in FIG. 10 (B).
FIG. 12 is a plan view showing another embodiment, in which a press-fitting device is installed above a caisson frame of a second lift, and a stradd with guide rollers is installed in a gap between the press-fitting device and an intermediate connection pile.
13 is a cross-sectional view taken along the line gg of FIG. 12, and is a view in which the depth of the left and right caissons is set differently from the center.
14A is a cross-sectional view taken along the line hh of FIG. 12, and FIG. 14B is a detailed view of a portion i of FIG.
FIG. 15 is an enlarged plan view showing a relationship between a straddle with a roller, a reaction force pile, and a caisson side wall.
FIG. 16 is an enlarged side view showing a relationship between a straddle with a roller, a reaction force pile, and a caisson side wall.
[Explanation of symbols]
1 permanent foundation pile
1a pile concrete
2 Intermediate connection pile
2a pile head
3 Construction foundation surface (ground surface)
4 caisson skeleton
4a Blade
4b Caisson body wall
4c caisson partition wall
5 Support plate
6 Reaction girder
7 Hydraulic jack
8 Gripper rod (tension rod)
10 Press-fitting equipment
12 bearing girder
13 Hanging equipment
14 caisson bottom
15 Concrete with floor
16 gap
17 Adjust rod
18 Anchor coupler
19 Mounting bracket
20 PC steel
21 Suspension bars (Caisson suspension support members)
22 Strad
23 Guide roller
24 bolt nut

Claims (6)

In the process of applying pressure with a jack and sinking an open caisson at a predetermined position to a predetermined depth, by connecting a rigid support member erected on a permanent foundation pile driven into the area where the caisson is to be installed to the jack. A method of laying a caisson using a permanent foundation pile, wherein the rigid support member and the permanent foundation pile are used as press-fitting reaction materials for laying the caisson. The permanent foundation pile is constructed by embedding the rigid support member in pile concrete, and in response to driving the permanent foundation pile at a predetermined depth, from the top of the permanent foundation pile. 2. A caisson laying method according to claim 1, wherein said rigid supporting member is exposed by sequentially shaking pile concrete. The rigid support member comprises an intermediate connection pile made of H-section steel or the like, and the intermediate connection pile is used as a caisson horizontal support reaction force member to suppress lateral movement of the caisson. The caisson setting method according to claim 1 or 2, wherein the foundation pile is used. The movement of the caisson is restricted only in the vertical direction by fixing a strud to the rigid support member and bringing a guide roller provided on the strad into contact with an inner wall and a partition wall of the caisson. 3. A caisson laying method using the permanent foundation pile according to any one of the above items 3. The caisson suspends and holds the rigid support member and the permanent foundation pile after applying pressure by a jack in the submerging method according to any one of claims 1 to 3 to complete the submerging of the open caisson to a predetermined position and a predetermined depth. A caisson using a permanent foundation pile, characterized in that the caisson is used as a power material, and the jack is rearranged to apply a lifting force to the caisson to prevent the caisson from subsidence (self-settling) and to construct a caisson base. Support method. In constructing the caisson bottom according to claim 5, the foundation concrete is poured into a thickness substantially equal to the cutting edge of the caisson, and the permanent foundation pile is cut so that the cut surface is substantially aligned with the upper surface of the foundation concrete. A caisson supporting method using a permanent foundation pile, wherein the permanent foundation pile and the caisson body are integrated by driving the caisson bottom.

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