JP6941660B2 - Construction method of superstructure on water and structure of superstructure - Google Patents

Description

The present invention relates to a method for constructing a superstructure on the water and a structure for the superstructure. It relates to a method of constructing a superstructure on water and a structure of a superstructure that can efficiently construct a superstructure by reducing complicated work.

To construct a superstructure such as a pier supported by piles erected on the bottom of the water, for example, concrete is placed by surrounding the steel frames and reinforcing bars placed on the water at the upper end of the pile with a formwork. There is a way. When constructing a superstructure with so-called cast-in-place concrete in this way, there is a limit to improving work efficiency because there are many complicated works on the water.

On the other hand, a method of forming a pile head and the like with precast concrete on land and fixing these precast members to the upper end of a pile erected on the underwater ground to construct a superstructure and a structure of the superstructure. It has been proposed (see, for example, Patent Document 1). According to this proposal, complicated work on the water is reduced as compared with the case where the superstructure is constructed by cast-in-place concrete, which is advantageous for improving work efficiency.

In the precast member used in the invention described in Patent Document 1, a sheath tube extending downward, a support member crossing the inside of the sheath tube, and a formwork support member extending inside the sheath tube are integrated. (Fig. 4). The precast member is suspended by a crane, the formwork support member is inserted into the pile, the sheath pipe is fitted onto the pile, and the bearing member is brought into contact with the recess formed at the upper end of the pile. A bottom formwork fixed to the lower end of the formwork support member closes a predetermined position of the pile (paragraph 0049, FIGS. 6, 7). After that, the precast member is rotated around the pile axis direction to engage the bearing member with the engaging notch at the upper end of the pile (paragraph 0050, FIGS. 6, 7).

In the method proposed in Patent Document 1, it is necessary to cut out the upper end portion of the pile on the water in order to install the precast member at a predetermined position. In addition, since the outer diameter of the bottom formwork installed in the formwork support member to be inserted inside the pile is close to the inner diameter of the pile, a precast member (precast member) is required to insert the formwork support member into the pile. It is necessary to accurately position the formwork support member) and perform the crane work precisely. Further, after the bearing member is brought into contact with the recess at the upper end of the pile, the precast member is rotated around the pile axis direction to engage the bearing member with the engaging notch of the pile. Is required. Therefore, there is room for improvement in improving work efficiency.

As another embodiment in Patent Document 1, a sheath tube (form support member) and a precast member are separately prepared, and after the sheath tube is fitted onto a pile, a support member that crosses the precast member is piled. A method of fitting into a fitting recess formed at the upper end of the above has been proposed (paragraphs 0058 to 0060, FIG. 8). This method eliminates the work of rotating the precast member around the pile axis direction, but the shape and position of the notch at the upper end of the pile for externally fitting the sheath pipe to the pile has high processing accuracy and complicated water. The point that the work of is required is not solved. Further, additional work is required to accurately position the precast member and fit it into the fitting recess of the sheath tube.

When driving piles on the bottom of the water, it is difficult to place the piles in a predetermined position accurately due to the influence of waves and tidal currents. Generally, the pile driving position is ± 10 cm with respect to the design position, and the height position is ± 5 cm. Therefore, the position accuracy of the piles placed on the bottom ground is lower than that of the piles placed on land. In the method described in Patent Document 1, in addition to the outer diameter of the bottom formwork having a dimension close to the inner diameter of the pile, it is necessary to install the precast member according to the driving position of the upper end portion of each pile. There is. Therefore, since the precast member is strictly constrained to the position of the pile and attached, it is not possible to absorb the error of the driving position of the pile. That is, there is a problem that it is difficult to construct the superstructure at the regular position as designed because the error of the pile placing position has to be absorbed only at the place of the cast-in-place concrete.

JP-A-2018-25042

An object of the present invention is to reduce complicated work on the water and efficiently construct a superstructure at the upper end of a pile erected on the bottom ground while absorbing an error in the position of the pile. To provide a method of constructing a superstructure and a structure of a superstructure.

In order to achieve the above object, the method for constructing a superstructure on the water of the present invention is to install a pile head body formed in advance at the upper end of a plurality of piles erected on the bottom ground, and to install the pile head bodies adjacent to each other. A superstructure on the water that constructs a superstructure that is fixed and supported by the pile by connecting the heads with a beam so that the pile head and the upper part of the beam are covered with a floor slab. In the construction method, the pile head has an insertion portion extending vertically and a connecting beam portion joined to the upper end side of the insertion portion and extending in a plurality of horizontal directions. A partition plate for vertically separating the inside of the pile is provided at a position at a predetermined depth from the upper end of the pile, and the insertion portion is loosely inserted into the inside of the pile from above the pile and at the upper end of the pile, respectively. By placing the connecting beam portion of the pile and filling the filling concrete between the inner peripheral surface of the pile above the partition plate and the insertion portion, the pile head body is formed at the upper end of the pile. It is characterized by being fixed to a part.

The structure of the superstructure on the water of the present invention is such that the pile head body formed in advance and the pile head body fixed to the upper ends of a plurality of piles erected on the bottom ground are adjacent to each other. In the structure of a superstructure on the water which has a connecting beam and a pile head body and a floor slab covering the upper part of the pile, and is fixed and supported by the pile, the pile head body. However, the pile has an insertion portion extending vertically and a connecting beam portion joined to the upper end portion side of the insertion portion and extending in a plurality of horizontal directions, and the pile is the upper end thereof. A partition plate that isolates the inside from above to a predetermined depth is provided in advance before the pile head is fixed to the upper end of the pile, and the insertion portion is from above the pile to the pile. The pile is inserted with a gap that allows it to float with respect to the inner peripheral surface of the pile, and each of the connecting beam portions is placed on the upper end of the pile, and the pile is above the partition plate. The pile head is fixed to the upper end of the pile through the solidified filling concrete in which the filling concrete is filled in the gap between the inner peripheral surface of the pile and the insertion portion. ..

According to the present invention, in the pile head body, the insertion portion protrudes downward from the connecting beam portion. Then, since the insertion portion is inserted from above the pile with a gap that allows it to float with respect to the inner peripheral surface of the pile, the insertion portion is inserted with high accuracy when the insertion portion is inserted into the pile. No need to position. Then, by moving the pile head body downward and placing each of the connecting beam portions on the upper end portion of the pile, the pile head body is moved to the upper end portion of the pile while reducing complicated work on the water. Can be installed stably.

After that, the filled concrete filled between the inner peripheral surface of the pile above the partition plate and the insertion portion is solidified, so that the pile head body can be firmly fixed to the upper end portion of the pile. Even if there is an error in the driving position of the pile, since the insertion portion has an appropriate clearance with respect to the inner peripheral surface of the pile, this error can be absorbed and the pile head body can be fixed to the pile. .. Then, by making the upper part of the beam connecting the pile head body and the adjacent pile head bodies covered with a deck, the pile is placed at the upper end of the pile erected on the submerged ground. It is possible to efficiently construct superstructures by reducing complicated work on the water while absorbing positional errors.

It is explanatory drawing which illustrates the structure of the superstructure of this invention in a plan view. It is explanatory drawing which illustrates the superstructure in the cross-sectional view of AA of FIG. It is explanatory drawing which enlarges the periphery of the pile head body of FIG. 2, and illustrates in the vertical cross-sectional view. It is explanatory drawing which illustrates the superstructure in the cross-sectional view of BB of FIG. It is explanatory drawing which illustrates the pile, the sheath tube part, and the insertion part in the CC cross-sectional view of FIG. It is explanatory drawing which illustrates the pile head body before installing on a pile in a plan view. It is explanatory drawing which illustrates the pile head body of FIG. 6 in the front view. It is explanatory drawing which illustrates the pile head body in the DD cross-sectional view of FIG. It is explanatory drawing which illustrates the deformation example of a pile head body in a plan view. It is explanatory drawing which illustrates the precast beam part in a plan view. It is explanatory drawing which illustrates the precast beam part of FIG. 10 in the front view. It is explanatory drawing which illustrates the precast floor part in a plan view. It is explanatory drawing which illustrates the process of installing a pile head body at the upper end part of the pile erected on the underwater ground in a plan view. It is explanatory drawing which illustrates the process of FIG. 13 in a vertical cross-sectional view. It is explanatory drawing which illustrates the process of laying the precast beam part between pile head bodies in a plan view. It is explanatory drawing which illustrates the process of FIG. 15 in the vertical cross-sectional view. It is explanatory drawing which illustrates the state which connected the precast beam part between pile head bodies in the side view. It is explanatory drawing which illustrates the state of FIG. 17 in the vertical cross-sectional view. It is explanatory drawing which illustrates the state which formed a beam by placing concrete between a pile head body and a precast beam part in a plan view. It is explanatory drawing which illustrates the state of FIG. 19 in the vertical cross-sectional view. It is explanatory drawing which illustrates the process of filling a filler and filling concrete in a vertical cross-sectional view. It is explanatory drawing which illustrates the state which the pile head body connected by a beam is fixed to the upper end part of a pile in a plan view. It is explanatory drawing which illustrates the state of FIG. 22 in the vertical cross-sectional view. It is explanatory drawing which illustrates the process of installing a precast floor part on a pile head body and a beam in a plan view. It is explanatory drawing which illustrates the state which installed the precast floor part on the pile head body and a beam in the vertical cross-sectional view. It is explanatory drawing which illustrates the process of placing concrete on the precast floor part and forming a floor slab in a vertical cross-sectional view. It is explanatory drawing which expands and illustrates the process of installing a pile head body at the upper end part of a pile in a vertical cross-sectional view. It is explanatory drawing which expands and exemplifies another method of installing a pile head body at the upper end part of a pile in a vertical cross-sectional view. It is explanatory drawing which illustrates the pile head body / beam unit which connected adjacent pile head bodies by a precast beam part in a plan view. It is explanatory drawing which illustrates another pile head body / beam unit in a plan view. It is explanatory drawing which illustrates the pile head body / beam / floor slab unit which covered the upper part of a pile head body / beam unit with a precast floor part in a plan view. It is explanatory drawing which expands and exemplifies the process of installing a pile head body at the upper end portion of an oblique pile in a vertical cross-sectional view. It is explanatory drawing which illustrates the state in which the pile head body of FIG. 32 was installed at the upper end portion of the oblique pile in the vertical cross-sectional view.

Hereinafter, the method for constructing the superstructure on the water and the structure of the superstructure of the present invention will be described based on the embodiment shown in the figure.

As illustrated in FIGS. 1 and 2, the superstructure 1 in the present invention is a pier or the like fixed to the upper ends of a plurality of piles 16 placed on the bottom ground F and supported by these piles 16. Is. In the structure of the superstructure 1 on the water of the present invention, the pile head body 2 and the beam 10 connecting the adjacent pile head bodies 2 fixed to the upper ends of the plurality of piles 16 and these are connected to each other. It has a pile head body 2 and a floor slab 13 that covers the upper part of the beam 10. The superstructure 1 may be provided with other necessary members as appropriate. As illustrated in FIGS. 3 to 5, the insertion portion 3 of the pile head body 2 is inserted into the pile 16, and the pile head body 2 is fixed to the upper end portion of the pile 16 by the solidified filling concrete 8. There is.

The pile head body 2 is formed on land or the like in advance before being installed on the pile 16. As illustrated in FIGS. 6 to 8, the pile head body 2 is joined to the insertion portion 3 extending vertically and the upper end portion side of the insertion portion 3 and extends in a plurality of horizontal directions. It has a connecting beam portion 5. The pile head body 2 of this embodiment further has a precast concrete 4 (hereinafter referred to as PC4) in which at least a part of each connecting beam portion 5 is embedded, and a sheath pipe portion 6 embedded in the PC4. ing.

The insertion portion 3 extends vertically inside the sheath tube portion 6 and projects downward from the lower end opening of the sheath tube portion 6. Each connecting beam portion 5 penetrates the sheath pipe portion 6 and extends in the horizontal direction. The lower end of the sheath tube portion 6 projects downward from each connecting beam portion 5. The PC 4 is joined to the outer peripheral side of the sheath tube portion 6. The upper surfaces of the PC 4, the connecting beam portion 5 and the sheath pipe portion 6 are substantially at the same level.

The insertion portion 3 is formed of a steel frame or the like, and in this embodiment, it is formed by using H-shaped steel. The insertion portion 3 can adopt various forms such as a circular pipe, but is specified so that it can be loosely inserted into the pile 16.

The connecting beam portion 5 is formed of a steel frame or the like, and in this embodiment, it is formed by using I-shaped steel. The connecting beam portion 5 extends in four directions of front, back, left, and right of the insertion portion 3, but can be specified to extend in a plurality of horizontal directions. The horizontal direction is not limited to a direction orthogonal to the extending direction (longitudinal direction) of the insertion portion 3, but may be a direction substantially orthogonal to the extending direction (longitudinal direction). The connecting beam portion 5 can extend from the insertion portion 3 in two directions, three directions, five directions, and the like. Basically, it is desirable that the connecting beam portions 5 are arranged at equal intervals in the circumferential direction with the insertion portion 3 as the center in a plan view. Each connecting beam portion 5 penetrates from the inside of the sheath pipe portion 6 to the outside, further penetrates the PC 4, and projects from the side surface of the PC 4. The connecting beam portion 5 may be designed so as not to protrude from the side surface of the PC 4, and the beam 10 and the pile head body 2 may be connected only by the reinforcing bar 11c and the concrete 12 described later.

Reinforcing bars 4a extending along the respective connecting beam portions 5 are embedded in the PC 4, and these reinforcing bars 4a project from the side surface of the PC 4. In the drawings (FIGS. 17 to 23, 25, 26, 29, and 30), the reinforcing bar 4a and other reinforcing bars 11c and 14b described later are omitted without being described. A brim plate 7 is joined to the outer peripheral surface of the sheath tube portion 6 at a position below each connecting beam portion 5. The entire brim plate 7 is embedded in the PC 4. The brim plate 7 is provided to fix the reinforcing bar 4a facing the reinforcing bar 11c arranged below the steel frame beam 11a of the precast beam portion 11 described later.

Like the pile head body 2 illustrated in FIG. 9, the structure may be such that the connecting beam portions 5 are not directly connected to each other but are connected to the insertion portion 3. In FIG. 9, each connecting beam portion 5 is arranged at a position overlapping the insertion portion 3 in a plan view and is connected to the insertion portion 3. Alternatively, each connecting beam portion 5 may be indirectly connected to the insertion portion 3 with a connecting member interposed therebetween. In the case of this structure, each connecting beam portion 5 can be connected to the insertion portion 3 in an arrangement that does not overlap with the insertion portion 3 in a plan view.

A partition plate 16a that vertically isolates the inside of the pile 16 is provided in advance at a position at a predetermined depth from the upper end of the pile 16. That is, the partition plate 16a is attached to the pile 16 before the pile head body 2 is installed at the upper end of the pile 16. For example, the pile 16 is piled on land or the like before being driven into the bottom ground F. It is welded to 16. The partition plate 16a is made of a steel plate or the like.

As illustrated in FIGS. 3 to 5, the insertion portion 3 is inserted into the pile 16 with a gap that allows the insertion portion 3 to move from above the pile 16 to the inner peripheral surface of the pile 16. That is, a certain amount of gap is secured between the insertion portion 3 and the inner peripheral surface of the pile 16, and the filled concrete 8 described later is filled in this gap.

Each connecting beam portion 5 is placed on the upper end of the pile 16 inserted between the insertion portion 3 and the sheath pipe portion 6. The gap between the inner peripheral surface of the pile 16 above the partition plate 16a and the insertion portion 3,
Filling concrete 8 is filled in the gap between the inner peripheral surface of the sheath pipe portion 6 and the connecting beam portion 5. The pile head body 2 is fixed to the upper end portion of the pile 16 via the solidified filling concrete 8. A filler G is filled between the inner peripheral surface of the sheath pipe portion 6 and the pile 16.

It is not necessary to airtightly (watertightly) isolate the inside of the pile 16 by the partition plate 16a, but the partition plate 16a isolates the inside of the pile 16 so that the unsolidified filled concrete 8 is held. The partition plate 16a is installed at a depth position that does not interfere with the insertion portion 3 that is loosely inserted into the pile 16.

In this embodiment, the beam 10 is composed of a precast beam portion 11 and concrete 12. The precast beam portion 11 was formed on land or the like in advance before being installed. The concrete 12 is joined to both ends of the precast beam portion 11 in the extending direction (longitudinal direction).

As illustrated in FIGS. 10 and 11, the precast beam portion 11 is composed of a steel frame beam 11a, a precast concrete 11b (hereinafter referred to as PC 11b) joined to both side surfaces and a lower end surface of the steel frame beam 11a, and a reinforcing bar 11c. ing. The reinforcing bar 11c extends along the PC 11b and is embedded, and protrudes from the longitudinal end face of the PC 11b. The beam 10 may be composed of only a precast member (equivalent to the precast beam portion 11) previously formed on land or the like before installation.

In this embodiment, the floor slab 13 is composed of a precast floor portion 14 and concrete 15. The precast floor portion 14 was formed on land or the like in advance before being installed. The concrete 15 is joined so as to cover the upper surface of the precast floor portion 14. The floor slab 13 may be composed of only precast members (equivalent to the precast floor portion 14) formed on land or the like in advance before installation.

As illustrated in FIG. 12, the precast floor portion 14 is composed of precast concrete 14a (hereinafter referred to as PC14a) and reinforcing bars 14b. The reinforcing bars 14b are embedded in the PC 14a in a grid pattern and project from the four end faces of the PC 14a.

Next, a method of constructing the superstructure of the present invention will be described.

As illustrated in FIGS. 13 and 14, a plurality of cylindrical piles 16 are erected on the bottom ground of the area where the superstructure 1 is constructed. Steel pipe piles and the like are used as the piles 16, and the number of piles 16 is appropriately determined depending on the size of the superstructure 1 and the like. The pile 16 is driven by a known pile driving method, and the upper end portion of the pile 16 on which the superstructure 1 is constructed protrudes above the water.

Each pile 16 is generally driven at a set plane position (target position). However, since the piles are driven by the driving work on the water (on the sea), the plane position where each pile 16 is actually driven has a slight error (about several cm) with respect to the target position. ..

The pile head body 2 is suspended by a hanging wire of a crane, moved above the pile 16 to be installed, positioned, and then moved downward. As a result, as illustrated in FIGS. 13 and 14, the insertion portion 3 is loosely inserted into the inside of the pile 16 from above the pile 16, and the upper end of the pile 16 is inserted between the insertion portion 3 and the sheath pipe portion 6. Each connecting beam portion 5 is placed on the.

The loosely inserted insertion portion 3 has a certain clearance with respect to the inner peripheral surface of the pile 16. As illustrated in FIG. 5, when the center position of the insertion portion 3 and the center position of the pile 16 are matched in a plan view, the minimum clearance C1 between the insertion portion 3 and the inner peripheral surface of the pile 16 is, for example, 10 cm. More preferably, it is set to 15 cm or more. That is, the loose insertion in the present invention means that the lower limit (lower limit value C1M) of the minimum clearance C1 of this degree is secured.

When the center position of the sheath tube portion 6 and the center position of the pile 16 are matched in a plan view, the minimum clearance C2 between the inner peripheral surface of the sheath tube portion 6 and the outer peripheral surface of the pile 16 is the insertion portion 3 described above. The lower limit value C1M of the minimum clearance between the pile 16 and the inner peripheral surface of the pile 16 is secured. That is, the lower limit value C2M of the minimum clearance C2 is set to be equal to or higher than the lower limit value C1M (C2M ≧ C1M). Even if the insertion portion 3 is inserted with the maximum deviation from the pile 16 in a plan view, each connecting beam portion 5 has a length to be placed on the upper end of the pile 16.

Next, the precast beam portion 11 is suspended by the suspension wire of the crane and moved upward between the adjacent pile head bodies 2 installed at the upper end portion of the pile 16 as illustrated in FIGS. 15 and 16. After positioning it, move it downward. As a result, as illustrated in FIGS. 17 and 18, the precast beam portion 11 is installed between the adjacent pile head bodies 2. The opposing steel frame beam 11a and the connecting beam portion 5 are fixed with a connecting tool such as a bolt to connect the pile head body 2 and the precast beam portion 11.

Next, the formwork is arranged so as to surround between the connected precast beam portion 11 and the connecting beam portion 5 facing each other, and the concrete 12 is placed. Reinforcing bars 4a and 11c that are exposed facing the area where the concrete 12 is placed are connected in advance. The exposed reinforcing bars 4a and 11c are buried in the cast concrete 12. When the concrete 12 is solidified and joined to the steel beam 11a and the PC 11b, the beam 10 is formed as illustrated in FIGS. 19 and 20, and the concrete 12 is solidified and joined to the PC 4 and the connecting beam portion 5. ..

Next, as illustrated in FIG. 21, the filling concrete 8 is thrown in from the upper end opening of the sheath pipe portion 6, and the gap between the inner peripheral surface of the pile 16 above the partition plate 16a and the insertion portion 3 and the sheath pipe. Filling concrete 8 is filled in the gap between the inner peripheral surface of the portion 6 and the connecting beam portion 5. When the filled filling concrete 8 is solidified, the pile head body 2 is fixed to the upper end portion of the pile 16 via the solidified filling concrete 8 as illustrated in FIGS. 3 to 5.

Further, the filler G is filled between the inner peripheral surface of the sheath pipe portion 6 and the pile 16. The filler G prevents water from entering between the inner peripheral surface of the sheath pipe portion 6 and the pile 16. As the filler G, any material that can prevent the ingress of water can be used, and an elastic body such as rubber or concrete can be used. As a result, as illustrated in FIGS. 22 and 23, the adjacent pile heads 2 fixed to the upper end of the pile 16 are firmly connected by the beam 10.

Next, the precast floor portion 14 is suspended by a hanging wire of a crane, moved above the connected pile head body 2 and the beam 10, positioned, and then moved downward. As a result, as illustrated in FIGS. 24 and 25, the precast floor portion 14 is installed on the upper surfaces of the connected pile head body 2 and the beam 10. A gap is formed between the precast floors 14 installed adjacent to each other, and the reinforcing bar 14b is exposed in this gap. Reinforcing bars 14b that are exposed facing each other are connected in advance.

Next, as illustrated in FIG. 26, concrete 15 is cast on the upper surface of the precast floor portion 14. Concrete 15 is also placed in the gap between the precast floors 14. The reinforcing bars 14b exposed in the gaps between the precast floors 14 are buried in the cast concrete 15. The concrete 15 is solidified and joined to the upper surface of the precast floor portion 14 and the upper surface of the pile head body 2 to form the floor slab 13, and the upper part of the pile head body 2 and the beam 10 is covered with the floor slab 13. It becomes a state. In this way, the superstructure 1 fixed and supported by the plurality of piles 16 erected on the submerged ground F is constructed.

In the present invention, paying attention to the pile head body 2, the insertion portion 3 protrudes downward from the sheath pipe portion 6 and the connecting beam portion 5, and the insertion portion 3 protrudes most downward. Then, the insertion portion 3 is loosely inserted into the pile 16 from above the pile 16. Therefore, the insertion portion 3 can be inserted into the pile 16 without interfering with the pile 16 without positioning the insertion portion 3 with respect to the pile 16 with high accuracy. That is, in the present invention, the pile 16 may be driven based on the conventional control standard, and high accuracy is not required. Then, the pile head body 2 is moved downward, and the respective connecting beam portions 5 are placed on the upper ends of the pile 16 inserted between the insertion portion 3 and the sheath pipe portion 6, whereby the pile head portion is placed. The body 2 can be stably installed (temporarily placed) on the upper end of the pile 16. Therefore, complicated work on the water can be reduced.

Then, as described above, the pile head body 2 can be firmly fixed to the upper end portion of the pile 16 by solidifying the filling concrete 8. Even if the pile 16 is driven with an error with respect to the target position, the insertion portion 3 has a certain clearance with respect to the inner peripheral surface of the pile 16, so that this error is absorbed and the pile is piled up. The head body 2 can be fixed to the stake 16.

In particular, when the precast beam portion 11 formed before installation is used for the beam 10, the distance between the adjacent pile head bodies 2 is fixed to a constant value. Therefore, if there is an error in the driving position of the pile 16, it becomes difficult to connect the adjacent pile heads 2 with each other by the precast beam portion 11 having a constant length. It will be resolved. As a result, it is possible to efficiently construct the superstructure 1 by reducing complicated work on the water while absorbing the error of the driving position of the pile 16.

If not only the pile head body 2 but also the precast beam portion 11 formed in advance before connecting the adjacent pile head bodies 2 to each other is used as the beam 10 as in this embodiment, complicated work on water can be performed. It will be reduced more. Along with this, it is advantageous to efficiently construct the superstructure 1. Further, when the precast floor portion 14 formed in advance before covering the pile head body 2 and the beam 10 is used as the floor slab 13 as in this embodiment, complicated work on water is further reduced. .. Along with this, it is advantageous to efficiently construct the superstructure 1.

The pile 16 driven into the submerged ground F has an error with respect to the target value not only in the plane position but also in the vertical position. That is, there is an error in the vertical position of the upper end surface of the pile 16. Therefore, it is preferable to grasp the error of the vertical position by surveying and attach the spacer 9 having a thickness corresponding to this error to the lower end surface of the connecting beam portion 5 as illustrated in FIG. 27. By installing the pile head body 2 at the upper end of the pile 16 via the spacer 9, the pile head body 2 can be adjusted to a target height position.

As illustrated in FIG. 28, the spacer 9 can be fixed to the upper end of the pile 16 before the pile head 2 is installed on the upper end of the pile 16. It is also possible to connect the partition plate 16a to the hanging member 9a suspended from the spacer 9 and install the partition plate 16a inside the pile 16. When the partition plate 16a is installed at a desired position inside the pile 16 in this way, the work on water for installing the partition plate 16a can be reduced.

In the above-described embodiment, the pile head body 2 has an insertion portion 3, a connecting beam portion 5, a PC 4, and a sheath pipe portion 6, but the sheath pipe portion 6 may be omitted. Further, the pile head body 2 can be formed only by the insertion portion 3 and the connecting beam portion 5 by omitting the sheath pipe portion 6 and the PC 4.

As in the above-described embodiment, one independent pile head body 2 is fixed to the upper end portion of the pile 16, but the pile head body 2 is not limited to this method. It is also possible to fix each pile head body 2 to the upper end portion of the pile 16 after connecting a plurality of pile head bodies 2.

For example, as shown in FIG. 29, a pile head body / beam unit U1 in which adjacent pile head bodies 2 are connected to each other by at least a precast beam portion 11 constituting the beam 10 is formed on land or the like in advance before installation. You can also do it. In this unit U1, adjacent pile head bodies 2 are connected to each other by a precast beam portion 11. The size of the unit U1 (the number of the pile head body 2 and the precast beam portion 11) is determined in consideration of the lifting capacity of the crane and the like.

The pile head / beam unit U1 is suspended by a crane suspension wire, positioned at a predetermined position, and then moved downward. As a result, each pile head body 2 of the unit U1 is installed at the upper end portion of the corresponding pile 16. After that, as described above, the necessary work for fixing the pile head body 2 to the upper end portion of the pile 16 is performed.

FIG. 30 illustrates another pile head / beam unit U2. In this pile head body / beam unit U2, unlike the unit U1 described above, adjacent pile head bodies 2 are connected by a beam 10 (precast beam portion 11 and concrete 12). The size of the unit U2 (the number of the pile head body 2 and the beam portion 10) is determined in consideration of the lifting capacity of the crane and the like. The pile head / beam unit U2 is suspended by a crane suspension wire, positioned at a predetermined position, and then moved downward. As a result, each pile head body 2 of the unit U2 is installed at the upper end portion of the corresponding pile 16. After that, as described above, the necessary work for fixing the pile head body 2 to the upper end portion of the pile 16 is performed. When this unit U2 is used, it is not necessary to cast the concrete 12 on the water.

As illustrated in FIG. 31, adjacent pile head bodies 2 are connected to each other by a beam 10, and the upper part of the connected pile head bodies 2 and the beam 10 is covered with at least a precast floor portion 14 constituting the floor slab 13. The pile head / beam / floor unit U3 can be formed on land or the like in advance before installation. The size of the unit U3 (the number of the pile head body 2, the beam portion 10, and the precast floor portion 14) is determined in consideration of the lifting capacity of the crane and the like.

The pile head / beam / floor unit U3 is suspended by a crane suspension wire, positioned at a predetermined position, and then moved downward. As a result, each pile head body 2 of the unit U3 is installed at the upper end portion of the corresponding pile 16. After that, as described above, the necessary work for fixing the pile head body 2 to the upper end portion of the pile 16 is performed.

When the above-mentioned units U1, U2, and U3 are used, some operations conventionally performed on water will be performed on land or the like. Therefore, it is advantageous to reduce complicated work on the water and efficiently construct the superstructure 1.

The present invention is not limited to the pile 16 placed vertically on the bottom ground F, but can also be applied to a so-called oblique pile 16 placed diagonally as illustrated in FIGS. 32 and 33. In this case, the pile head body 2 includes an insertion portion 3 that is inclined and projects downward in the same manner as the inclination of the inclined pile 16. The alternate long and short dash line CL1 in FIG. 32 is the center line extending up and down the center position of the pile head body 2 excluding the insertion portion 3, and the alternate long and short dash line CL2 is the center line extending the center position of the insertion portion 3 in the inclined direction. Shown.

The pile head body 2 is suspended by a hanging wire of a crane, moved above the inclined pile 16 to be installed and positioned, and then moved diagonally downward according to the inclination of the inclined pile 16. As a result, as illustrated in FIG. 33, the insertion portion 3 is loosely inserted into the inside of the oblique pile 16 from above the oblique pile 16 and inserted between the insertion portion 3 and the sheath pipe portion 6 at the upper end of the inclined pile 16. Each connecting beam portion 5 is placed on the.

In the pile head body 2 installed at the upper end portion of the inclined pile 16, the upper end position of the center line CL2 of the insertion portion 3 may be offset by a predetermined amount g with respect to the center line CL1. That is, the insertion portion 3 is offset in the direction opposite to the side where the clearance between the insertion portion 3 and the inner peripheral surface of the facing sheath tube portion 6 is narrowed (right side in FIG. 32) (left side in FIG. 32). Due to this offset, even if the insertion portion 3 is inclined and protrudes downward, it becomes easy to secure the necessary clearance between the insertion portion 3 and the inner peripheral surface of the sheath tube portion 6. The predetermined amount g of this offset is set according to the magnitude of the inclination angle of the inclined pile 16.

1 Superstructure 2 Pile head 3 Insertion part 4 Precast concrete (PC)
4a Reinforcing bar 5 Connecting beam 6 Sheath pipe 7 Brim plate 8 Filling concrete 9 Spacer 9a Suspension material 10 Beam 11 Precast beam 11a Steel beam 11b Precast concrete (PC)
11c Reinforcing bar 12 Concrete 13 Floor slab 14 Precast floor 14a Precast concrete (PC)
14b Reinforcing bar 15 Concrete 16 Pile 16a Partition plate U1, U2 Pile head body / beam unit U3 Pile head body / beam / floor unit G Filling material F Underwater ground

Claims (10)

A pre-formed pile head body is installed at the upper end of a plurality of piles erected on the submerged ground, and the pile head bodies adjacent to each other are connected by a beam, and the pile head body and the upper part of the beam are connected. In the method of constructing a superstructure on the water, which constructs a superstructure that is fixed and supported by the pile by making it covered with a floor slab.
The pile head body has an insertion portion extending vertically and a connecting beam portion joined to the upper end portion side of the insertion portion and extending in a plurality of horizontal directions, and has an upper end portion of the pile. A partition plate that separates the inside of the pile up and down is provided at a position at a predetermined depth from the pile.
The insertion portion is loosely inserted into the inside of the pile from above the pile, the connecting beam portions are placed on the upper ends of the pile, and the inner peripheral surface of the pile above the partition plate and the insertion portion are inserted. A method for constructing a superstructure on water, which comprises fixing the pile head body to the upper end portion of the pile by filling a filling concrete between the portions. The method for constructing a superstructure on water according to claim 1, wherein as the pile head body, a pile head body in which at least a part of each of the connecting beam portions is embedded in precast concrete is used. As the pile head body, a sheath tube portion is embedded in the precast concrete, and the insertion portion extends vertically inside the sheath tube portion and protrudes downward from the lower end opening of the sheath tube portion. Using a pile head body in which the connecting beam portion penetrates the sheath pipe portion and extends in the horizontal direction, and the lower end of the sheath pipe portion projects downward from each of the connecting beam portions.
Each of the connecting beam portions is placed on the upper end of the pile inserted between the insertion portion and the sheath pipe portion, and the connecting beam portion is placed between the inner peripheral surface of the sheath pipe portion and the connecting beam portion. The method for constructing a superstructure on water according to claim 2, wherein the filling concrete is filled and a filler is filled between the inner peripheral surface of the sheath pipe portion and the pile. The method for constructing a superstructure on water according to any one of claims 1 to 3, wherein a precast beam portion formed in advance before connecting the adjacent pile head bodies is used as the beam. The method for constructing a superstructure on water according to any one of claims 1 to 4, wherein a precast floor portion formed in advance before covering the pile head body and the upper part of the beam is used as the floor slab. A pile head body / beam unit in which adjacent pile head bodies are connected to each other by a precast beam portion formed in advance is formed in advance, and each of the pile head bodies / beam units corresponds to the pile head body. The method for constructing a superstructure on water according to any one of claims 1 to 3, which is fixed to the upper end of the pile. Adjacent pile heads are connected to each other by a pre-cast beam portion formed in advance, and the connected pile head body and the upper part of the precast beam portion are covered with a pre-cast floor portion formed in advance. One of claims 1 to 3 in which a body / beam / floor unit is formed in advance and the pile head body of each of the pile head body / beam / floor unit is fixed to the upper end portion of the corresponding pile. The method of constructing the above-mentioned water superstructure. The method for constructing a superstructure on water according to any one of claims 1 to 7, wherein the connecting beam portion extends in four directions of front, back, left and right of the insertion portion. Before installing the pile head body at the upper end portion of the pile, a spacer for adjusting the vertical position of the pile head body is fixed to the upper end portion of the pile, and the partition is provided by a suspending material suspended from the spacer. The method for constructing a superstructure on water according to any one of claims 1 to 8, wherein the plate is provided at a position of the predetermined depth. A pre-formed pile head body, a beam connecting adjacent pile head bodies fixed to the upper ends of a plurality of piles erected on the bottom ground, and the pile head body. And in the structure of the superstructure on the water, which has a deck covering above the beam and is fixed and supported by the pile.
The pile head has an insertion portion extending vertically and a connecting beam portion joined to the upper end side of the insertion portion and extending in a plurality of horizontal directions.
The pile has a partition plate that isolates the inside of the pile at a predetermined depth from the upper end of the pile in advance before the pile head is fixed to the upper end of the pile.
The insertion portion is inserted from above the pile with a gap that allows it to float with respect to the inner peripheral surface of the pile, and each of the connecting beam portions is placed on the upper end of the pile. hand,
Filling concrete is filled in the gap between the inner peripheral surface of the pile above the partition plate and the insertion portion, and the pile head body is placed on the upper end portion of the pile through the solidified filling concrete. The structure of the superstructure on the water, which is characterized by being fixed.

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