JP3850785B2 - Caisson laying method using main foundation pile - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an open caisson construction method in the field of civil engineering work, and more particularly to a caisson laying method and a support method using a main foundation pile.
[0002]
[Prior art]
Conventionally, the construction method of the lower structure (footing) by the pile foundation method is to install the required foundation pile first, and then perform temporary earth retaining work to the top edge of the foundation pile by open-cut method After excavation, the general procedure is to construct the substructure.
[0003]
In addition, the conventional open caisson laying technique is to install a required amount of ground fixing material represented by a ground anchor on the outer periphery slightly away from the caisson housing, and lay the caisson by using the anchor as a ground reaction force. The method is commonly used.
[0004]
Furthermore, as a method of suppressing the lateral movement of the caisson, there is a technique in which a dedicated pile or the like is separately installed in the vicinity of the caisson and used as a guide when the caisson is set as a stationary member.
[0005]
According to the pile foundation method in the prior art, the temporary earth retaining work for constructing the substructure requires a certain period of time, and the temporary material used for the temporary earth retaining work after the construction of the substructure In addition to requiring a construction period for removing the temporary material, it was difficult to completely remove the temporary material.
[0006]
In addition, the conventional technology related to open caisson construction is based on the premise that fixing materials such as ground anchors are installed in advance, and it depends on the soil conditions of the construction site and the weight of the caisson housing, but the open caisson construction In this case, it is easy to obtain an increase in caisson housing subsidence and improvement in construction accuracy by using press-fitting as an auxiliary method or by installing a weight on the upper part of the caisson housing to increase the apparent caisson housing weight. As a prerequisite.
[0007]
From the above, not only the construction period required for the installation of fixing materials such as ground anchors and the corresponding construction scope, but also the costs required for fixing materials and weights are borne, and environmental problems in the construction business have been addressed. However, it is difficult for the ground anchor to completely remove the anchoring portion, and the complete removal requires a further work period and cost.
[0008]
As an improved technique for solving the above problems, an underground building construction method disclosed in JP-A-6-341154 is known. In this prior art, instead of the construction method of connecting an earth anchor (ground anchor) to an anchor body installed separately from the foundation pile, the earth anchor was driven into the area where the caisson was submerged. In this way, the tension force obtained by the foundation pile can be obtained even when the caisson frame is set, and the construction period can be shortened.
[0009]
[Patent Document 1]
JP-A-6-341154
[Problems to be solved by the invention]
However, in the prior art disclosed in Japanese Patent Laid-Open No. 6-341154, the caisson housing can be sunk by using the reaction force of the jack by the ground anchor integrally connected to the foundation pile. Alternatively, it is made of a thin rod or the like and does not have its own rigidity, so that it can function as a reaction member that suppresses horizontal movement during the caisson housing installation work, or caisson installation Later, in order to prevent the inclination of the caisson frame due to imbalance in the support capacity of the ground, it is not possible to function as a temporary support material for the caisson when building the caisson base. It was difficult to set up with high precision, and problems such as instability of press-fitting work remained.
[0011]
Furthermore, in the conventional open caisson method, at the end of caisson frame installation, there may be some tilting or settlement of the caisson frame even after the caisson has settled due to imbalance in the bearing capacity of the landing ground. In order to support the caisson housing as a measure, it is troublesome to install a caisson support device that requires a support pile separately from the earth anchor, or to install a support (sanddle) under the caisson partition wall. This method is adopted.
[0012]
The present invention solves the above-described problems, and an object thereof is to provide a caisson laying method and a support method using a main foundation pile.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is configured as follows.
[0014]
According to a first aspect of the present invention, in the process of laying an open caisson to a predetermined depth at a predetermined position by applying pressure with a jack, the rigid support member erected on the main foundation pile driven into the area where the caisson is laid By connecting to the jack, the rigid support member and the main foundation pile are used as a press-fitting reaction force material for caisson deposition, the straddle is fixed to the rigid support member, and the guide roller provided on the straddle is connected to the caisson. The movement of the caisson is restricted only in the vertical direction by contacting the inner wall and the partition wall.
[0015]
According to a second aspect of the present invention, in the process of laying an open caisson to a predetermined depth at a predetermined position by applying pressure with a jack, the rigid support member standing on the main foundation pile driven into the area where the caisson is laid is By connecting to a jack, the rigid support member and the foundation foundation pile were used as a press-fitting reaction force material for caisson deposition, and the open caisson was completed to a predetermined position and a predetermined depth by applying pressure with the jack. Then, the rigid support member and the main foundation pile are used as a caisson suspension reaction force material, and the caisson is prevented from being oversunk (self-sinking) by applying a lifting force to the caisson with the rearranged jack. It is characterized by building a bottom board.
[0016]
In constructing the caisson bottom plate in the second invention, the third invention is that the foundation concrete is cast so that the foundation concrete is cast to approximately the same thickness as the edge of the caisson, and the top surface and the cut surface of the foundation concrete are substantially aligned. The pile is cut, and then the caisson bottom plate is placed to integrate the main foundation pile and the caisson frame.
[0017]
[Action]
In the first invention, when the foundation pile or the like is a structure that supports the lower construction body, the lower construction body is pre-constructed on the ground as a caisson, and when the caisson is set by the open caisson method, Since the caisson is laid down by taking the press-fitting reaction force on the foundation pile placed in the area to be laid and the rigid support member standing on the foundation pile, it is separate from the conventional ground anchor and main foundation pile. Needless to say, a foundation pile dedicated to press-fitting is not necessary, and both the foundation pile and the rigid support member are rigid bodies, so that they can function as a horizontal reaction force material. And can be performed smoothly. Further, by bringing the guide roller of the straddled guide roller fixed to the rigid support member into contact with the inner wall and the partition wall of the caisson, the movement of the caisson can be reliably restrained to the vertical component. It can be laid down smoothly.
[0018]
In the second and third inventions, after the caisson has been laid down to the predetermined position and the predetermined depth (bottomed), the caisson bottom plate is constructed to suppress the oversinking (self-sinking). In addition, no caisson frame suspension support pile is required, and there is no need for a laborious method (sanddle), and in addition, when constructing the caisson bottom plate, an intermediate connection is erected from the pre-installed main foundation pile. The caisson can be reliably lifted and supported using the pile, and the work becomes easy.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 are process diagrams of the caisson laying process of the present invention, FIGS. 5 to 8 are diagrams of a press-fitting device, FIGS. 9 to 11 are diagrams of a suspension device, and FIGS. It is shown as a corresponding figure. 12 to 16 are views of a caisson press-fitting device according to another embodiment.
[0020]
First, with reference to FIGS. 1-4, the construction order of caisson installation of this invention is divided into the following (1)-(9) processes, and is demonstrated roughly.
[0021]
(1) In the first step, a permanent foundation pile and an intermediate connection pile are installed.
(2) In the second step, a caisson blade portion is installed.
(3) In the third step, an nth lift caisson housing is constructed.
(4) In the fourth step, caisson press-fitting equipment is installed.
(5) In the fifth step, ground excavation is performed for caisson settlement.
(6) In the sixth step, the 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.
[0022]
Hereinafter, the details of each construction stage (step) of (1) to (9) will be described.
[0023]
(1) Main foundation pile and intermediate connection pile installation stage (step)
The required number of cast-in-place piles are constructed as the required foundation pile 1 in the predetermined area where the caisson is sunk by existing technologies such as the drilling method and all-casing method. As an example of a rigid support member, an intermediate connection pile (reaction force pile) 2 such as an H-shaped steel material is placed on a permanent foundation pile 1 such that the pile head 2a protrudes from the construction base surface (ground surface) 3. Install in the installed condition. (See Figure 1A)
[0024]
The intermediate connection pile 2 is embedded in the concrete 1a as indicated by the dotted line in the pile concrete 1a of the permanent foundation pile 1, and the connection pile head 2a is placed on the construction base surface (ground surface) 3 of the permanent foundation pile 1 The intermediate connection pile 2 made of H-shaped steel is made to protrude from the upper end, and the pile concrete 1a is crushed sequentially from the upper part of the permanent foundation pile 1 corresponding to driving the permanent foundation pile 1 to a predetermined depth. You may comprise by exposing.
[0025]
(2) Caisson blade edge installation stage (step)
The cutting edge 4 a of the caisson (frame) 4 is installed on the construction base surface 3. (See Figure 1A)
[0026]
(3) Caisson body n-th lift construction stage (step)
The caisson housing 4 of the nth lift is constructed. (N = 1, 2, 3, 4 ...)
[0027]
(4) Caisson press-fitting equipment installation stage (step)
A bearing plate 5 is installed on the constructed caisson housing 4, a reaction force girder 6 is temporarily installed on the bearing plate 5, and a hydraulic (hydraulic) jack 7 including a center hole jack is installed on the reaction force girder 6. Then, a tension rod (gripper rod) 8 is inserted into the hydraulic jack 7 and connected to the pile head 2 a of the intermediate connection pile 2 erected on the main foundation pile 1 to tension the hydraulic jack 7. The installation work of the press-fitting equipment 10 to obtain the press-fitting effect is performed. (See Figure 1B)
[0028]
(5) Caisson subsidence excavation stage
The caisson 4 is press-fitted and the ground 3a inside the caisson is excavated to sink the caisson 4. (See Figure 1C)
[0029]
At the same time, a straddle is installed 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 enclosure wall (or the caisson enclosure partition wall). (Or the caisson enclosure partition wall) The straddle that is located on the straddle is equipped with a series of operations to install the bulkhead roller in accordance with the caisson excavation depth, and the movable range of the caisson enclosure is restricted only in the vertical direction by these means, In other words, the caisson laying accuracy is improved by taking measures to prevent lateral movement. (The configuration in which the straddle is installed on the intermediate connection pile 2 will be described in other embodiments shown in FIGS. 12 to 16).
[0030]
(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 Figure 2A)
[0031]
By repeating the steps (3) to (5) to a predetermined depth, the caisson 4 is completely pressed and settled. (See FIGS. 2B and 2C)
[0032]
In the final lift construction of the caisson housing 4, the caisson suspension support member 11 (the caisson suspension support member is omitted in FIG. 2C and shown in FIGS. 3B and 3C) is projected upward from the caisson housing 4. The excavator at that time ends the excavation of the ground 3a inside the caisson, leaving a ground having a necessary depth longer than the caisson housing 4 can be prevented from being oversunk (self-sinking). Thereafter, the press-fitting equipment 10 is once removed. (See Figure 3A)
[0033]
(7) Caisson support member installation stage (step)
A supporting girder 12 is installed on the pile head 2 a of the intermediate connection pile 2, a reaction force girder 6 is installed on top of the supporting girder 12, and a hydraulic jack (center hole jack) 7 is attached to the reaction force girder 6. By installing the suspension bar (caisson suspension support member) 21 on the hydraulic jack 7 and installing the suspension facility 13 on the upper part. Then, the hydraulic jack 7 is tensed to prevent the caisson housing 4 from sinking using the main foundation pile 1 and the intermediate connection pile 2 erected on the main foundation pile 1 as a supporting reaction material. (See Figure 3B)
[0034]
(8) Final excavation (flooring) stage
After the caisson enclosure 4 settlement prevention measures are completed, the ground 3a inside the caisson is excavated, and the ground that has left the necessary penetration length is excavated (see FIG. 3C). Place and floor. (See Figure 4A)
[0035]
(9) Caisson construction completion stage (step)
Pile head processing of the foundation foundation pile 1 is performed, reinforcement is placed on the flooring concrete 15, and then the concrete is placed, and the caisson bottom 14 is constructed on the flooring concrete 15. The caisson bottom plate 14 and the caisson housing 4 are integrated by a mechanical joint (not shown). Therefore, the main foundation pile 1 and the caisson housing 4 can be integrated via the caisson bottom plate 14, and then the hydraulic jack 7 Jack down. Further, after that, the caisson suspension equipment 13 is removed, and the intermediate connection pile 2 protruding from the caisson bottom board 14 is cut and removed on the surface of the caisson bottom board 14 to complete the caisson work. (See Figure 4B)
[0036]
Next, the details of the press-fitting equipment will be described with reference to FIGS.
[0037]
FIG. 5 is a plan view in which the caisson housing 4 of the second lift is constructed and the press-fitting equipment 10 is installed thereon, FIGS. 6 and 7 are cross-sectional views taken along lines aa and bb in FIG. 5, and FIG. FIG. 7 is a detailed view of part c in FIG. 6.
[0038]
As shown in each figure, the caisson 4 has a partition wall constructed in, for example, a square shape when viewed from the plane, and a plurality of block-shaped bearing plates 5 on the left and right sides of the upper surface of the caisson 4 are separated from both sides. Are installed, and a pair of reaction force girders 6 are provided in parallel and on the left and right sides of each reaction force beam 6 at both ends of each reaction force 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 through a gap 16 between a pair of reaction force beams 6 and rises.
[0039]
The center hole jack and the gripper rod 8 constituting the hydraulic jack 7 are well known. By operating the hydraulic jack 7, the upper and lower stopper members built in the center hole jack are alternately expanded and contracted, and the gripper rod 8 The gripper rod 8 can be pulled up step by step by sliding the taper portion of the gripper and engaging with the engagement step portion, and is pulled relatively to the intermediate connection pile 2 to which the lower end of the gripper rod 8 is coupled. Can transmit reaction force.
[0040]
The connection between the gripper rod 8 and the intermediate connection pile 2 is 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 or the like is provided between the mounting bracket 19 provided at the upper end of the intermediate connection pile 2 and the anchor coupler 18. It is connected with PC steel wire. The connection structure of the gripper rod 8 and the intermediate connection pile 2 may be other known structures.
[0041]
As described above, by operating the four hydraulic jacks 7 arranged at substantially the four corners of the upper surface of the caisson 4 in synchronization, a few centimeters (2 cm) or less via the intermediate connection pile 2 which is a rigid body. Caisson 4 can be press-fitted with an error of. In addition, in order to take out the pressure input of the hydraulic jack 7, the gripper rod 8 is connected to the upper end of the intermediate connection pile 2. The gripper rod 8 has a certain degree of rigidity and the pressure input of the hydraulic jack 7. Since it is the shortest length required for taking out, there is no problem in making the intermediate connection pile 2 which is a rigid body function as a reaction force material for sinking the caisson 4 with high accuracy.
[0042]
The intermediate connection pile 2 desirably has greater rigidity as a reaction material during caisson press-fitting. As described above, the pile concrete 1a of the foundation foundation pile 1 is applied to 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 released to expose the intermediate connection pile 2 in response to placing the main foundation pile 1 to a predetermined depth. It is good.
[0043]
Next, FIG. 9 is a plan view in which the hanging equipment 13 is installed after the caisson housing 4 of the second lift is completed, and FIGS. 10A and 10B are views of FIG. FIG. 11 is a detailed view of a portion f in FIG.
[0044]
In the present invention, after the caisson housing 4 of the n-th lift is completed while leaving a part of excavation of the ground 3 a in the caisson housing 4, the caisson housing 4 is suspended and supported by the suspension equipment 13. As described above, a part of the left digging is finally excavated and floored, and the caisson bottom 14 is constructed. The caisson suspension facility 13 is required for this work.
[0045]
The details of the hanging equipment 13 according to the present invention are configured as follows.
[0046]
Of the plurality of intermediate connection piles 2 erected on the inner side of the caisson 4, the supporting girders 23 are provided in parallel at predetermined intervals using the pile heads 2a of the intermediate connection piles 2 at predetermined positions. A plurality of support plates 5 are provided on the support girders 23 at intervals, and one set of two reaction force girders 6 provided with a gap on each of the support plates 5 in parallel and in two sets on the left and right. It is provided. At both ends of each reaction force beam 6, a hydraulic jack 7 made up of a center hole jack that has been repositioned when caisson is installed is supported, and gripper rods 8 that pass through the center of the hydraulic jack 7 are supported. Are standing up through the gap 16 between the two pairs of reaction force beams 6.
Also, as shown in the figure, hanging bars 21 are embedded in the vicinity of the four corners of the uppermost caisson 4 among the multi-stage caissons 4 in which the partition walls are constructed in a U-shape when viewed from above. The upper part of the suspension bar 21 protrudes from the upper surface of the caisson 4 for a predetermined length, and the suspension bar 21 and the gripper rod 8 are connected.
[0048]
The gripper rod 8 and the suspension bar 21 are connected as follows. That is, an adjustment rod 17 is connected to the lower end of the gripper rod 8, an anchor coupler 18 is attached to the adjustment rod 17, and a PC steel rod 20 is provided between the mounting bracket 19 provided at the upper end of the suspension bar 21 and the anchor coupler 18. And PC steel wire. In addition to the above, the connection structure of the gripper rod 8 and the suspension bar 21 may be a known structure.
[0049]
The hydraulic jack (center hole jack) 7 and the gripper rod 8 are known as described above. Briefly, the gripper rod 8 is a shaft body in which engagement step portions and taper portions are alternately continued, and the center hole jack incorporates a pair of stopper members that can expand and contract and can move up and down. . When the center hole jack is operated, the upper and lower stopper members move up and down alternately, and each stopper member expands and slides the tapered portion of the gripper rod 8 while moving down. The gripper rod 8 can be pulled up step by step by repeatedly engaging with the engaging step and moving upward, and the rigid body is connected to the lower end of the gripper rod 8 via the suspension bar 21. The caisson 4 can be suspended and supported by the intermediate reaction pile 2 that is the support reaction force.
[0050]
In the state where the caisson 4 is suspended and supported by the suspension equipment 13 (when the settlement prevention measures have been completed), the ground 3a inside the caisson is excavated, and the ground where the necessary penetration length has been dug is excavated, and flooring concrete is provided. Is to be placed. (This has already been described)
[0051]
Next, FIG. 12 to FIG. 16 show another embodiment, and FIG. 12 shows that the press-fitting equipment 10 is installed on the upper part of the caisson housing 4 of the second lift, and in the gap between the press-fitting equipment 10 and the intermediate connection pile 2. FIG. 13 is a cross-sectional view taken along the line gg in FIG. 12, FIG. 14A is a cross-sectional view taken along the line hh in FIG. 12, and FIG. 14B is a plan view in which the straddle 22 having the guide roller 23 is installed. FIG. 14 is a detailed view of a part i in FIG. 13.
[0052]
In this embodiment, a plurality of H-shaped steel straddles 22 having different lengths are detachably provided by bolts and nuts 24 on both flanges of an H-shaped steel intermediate connection pile (reaction force pile) 2. A guide roller 23 is attached to the front end of the straddle 22 positioned at this portion, and this guide roller 23 is in pressure contact with the side wall of the caisson housing 4 so as to be rotatable. Other configurations in FIGS. 12 to 16 are the same as those of the press-fitting equipment 10 in FIGS. 5 to 8, and thus the same elements are denoted by the same reference numerals and description thereof is omitted.
[0053]
In this embodiment, a series of operations for laterally setting the straddle 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 enclosure wall 4b or the caisson enclosure partition wall 4c, The facilities will be installed in sequence with the caisson 4 drilling depth. Specifically, the straddles 22 are sequentially installed by bolt joints on the intermediate connection pile 2 that is exposed by peeling off the pile concrete 1a of the main foundation pile 1. Further, the guide roller 23 provided at the tip of the straddle 22 moves up and down while rotating in pressure contact with the caisson housing wall 4b and the partition wall 4c.
[0054]
The caisson housing 4 is smoothly moved downward by restraining its movable range only in the vertical direction by the straddle 22 with guide rollers. Thus, the intermediate connection pile (reaction force pile) 2 which is a rigid body to which the straddle 22 is attached is used as a reaction material, and measures for preventing lateral movement of the caisson housing 4 are taken, thereby improving caisson installation accuracy. be able to.
[0055]
Although the embodiment has been described above, the present invention is not limited to this illustrated example, and may be modified as appropriate within the scope of design changes, and these belong to the scope of the present invention.
[0056]
【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 temporary earth retaining work in the open-cut method can be omitted. In addition, the use of caisson press-fitting ground anchors in the open caisson method when using the press-fitting method and the installation work can be omitted, so it is impossible or difficult to remove and install the ground anchor, which is temporary work. It is possible to shorten the construction period required for the construction and to reduce the construction cost. Furthermore, the installation accuracy of open caisson can be secured with the same accuracy as that of the conventional technology, and the caisson frame can be used as the lower frame in the pile foundation method, resulting in labor-saving construction. .
[0057]
Furthermore, according to the present invention, after the caisson has been laid down to the predetermined position and the predetermined depth (bottomed down), the caisson bottom plate is constructed by suppressing the oversinking (self-sinking). In addition, a laborious method such as a stand (sanddle) is not required, and in addition, when constructing the caisson bottom plate, an intermediate connection pile standing up from a pre-installed foundation foundation pile is used. The caisson can be securely held and supported, which can contribute to labor saving in construction.
[0058]
Also, under the high water level represented by river construction, in the prior art, for example, when building an abutment, a corrugated pipe or the like was used as a temporary deadline, and then the building work was performed. According to the present invention, the caisson does not require a temporary deadline and the like, which is effective for shortening the construction period and reducing the construction cost as described above.
[0059]
Furthermore, compared to the caisson press-in method using a ground anchor, etc., by using a press-fitting device by interposing, for example, H-shaped steel as a reaction force member from a pre-installed foundation foundation pile, when using the ground anchor Since it becomes possible to suppress the elongation of the anchor part that appears, workability is reliably improved when jacking down at the time of caisson housing construction and temporarily removing the press-fitting equipment.
[0060]
[Brief description of the drawings]
FIG. 1 is a first process diagram of a caisson laying process of the present invention.
FIG. 2 is a second process diagram of the caisson setting process of the present invention.
FIG. 3 is a third process diagram of the caisson laying process of the present invention.
FIG. 4 is a fourth process diagram of the caisson laying process of the present invention.
FIG. 5 is a plan view in which a caisson housing for a second lift is constructed and press-fitting equipment is installed on the second caisson housing.
6 is a cross-sectional view taken along the line aa in FIG.
7 is a cross-sectional view taken along the line bb of FIG.
FIG. 8 is a detailed view of part c in FIG. 6;
FIG. 9 is a plan view in which a suspension facility is installed after the caisson housing of the second lift is completed.
10A and 10B are sectional views taken along line dd and ee in FIG.
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-fit facility is installed on the upper part of the caisson housing of the second lift, and a straddle with guide rollers is installed in the gap between the press-fit facility and the intermediate connection pile.
13 is a cross-sectional view taken along the line gg of FIG. 12 and is displayed by changing the set depth of the left and right caissons from the center.
14A is a cross-sectional view taken along the line hh in FIG. 12, and FIG. 14B is a detailed view of a portion i in FIG.
FIG. 15 is an enlarged plan view showing the relationship between the straddled roller, the reaction force pile, and the caisson side wall.
FIG. 16 is an enlarged side view showing the relationship between the straddled roller, the reaction force pile and the caisson side wall.
[Explanation of symbols]
[0061]
1 foundation foundation pile 1a pile concrete 2 intermediate connection pile 2a pile head 3 construction foundation surface (ground surface)
4 Caisson housing 4a Cutting edge 4b Caisson housing body wall 4c Caisson housing partition wall 5 Supporting plate 6 Reaction force girder 7 Hydraulic jack 8 Gripper rod (tension rod)
DESCRIPTION OF SYMBOLS 10 Press-fit equipment 12 Supporting girder 13 Suspension equipment 14 Caisson bottom board 15 Flooring concrete 16 Gap 17 Adjustment rod 18 Anchor coupler 19 Mounting bracket 20 PC steel material 21 Suspension reinforcement (caisson suspension support member)
22 Strud 23 Guide roller 24 Bolt nut

Claims (3)

In the process of laying open caisson to a predetermined depth at a predetermined position by applying pressure with a jack, by connecting to the jack a rigid support member standing on the foundation foundation pile driven into the caisson sunk area The rigid support member and the main foundation pile are used as a press-fitting reaction force material for caisson deposition , a strad is fixed to the rigid support member, and guide rollers provided on the straddle are used as inner walls and partition walls of the caisson. A caisson laying method using a main foundation pile, wherein the caisson movement is restricted only in a vertical direction by contacting. In the process of laying open caisson to a predetermined depth at a predetermined position by applying pressure with a jack, by connecting to the jack a rigid support member standing on the foundation foundation pile driven into the caisson sunk area The rigid support member and the main foundation pile are used as a press-fitting reaction force material for caisson deposition, and after the open caisson is completed to a predetermined position and a predetermined depth by applying pressure by the jack, the rigid support member And using the foundation pile as a caisson suspension reaction force material, applying the lifting force to the caisson with the rearranged jack to prevent the caisson from over-sinking (self-sinking), and building the caisson base A caisson support method using the characteristic foundation pile. In constructing the caisson bottom plate according to claim 2 , the foundation concrete is cast to a thickness substantially the same as that of the caisson blade, and the main foundation pile is cut so that the top surface and the cut surface of the foundation concrete are substantially aligned. A caisson support method using a permanent foundation pile, wherein the permanent foundation pile and the caisson frame are integrated by driving the caisson bottom plate.

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