JP2021173088A - Construction method of pile supporting structure - Google Patents

Abstract

To provide a construction method of a pile supporting structure in which there is no need to remove a formwork and a work can be efficiently carried out.SOLUTION: In a construction method of a pile supporting structure 1: concrete is installed onto a lower side formwork member 12 laid on a support body, to form a lower side floor slab portion 20; light weight embedded formwork members 22 are arranged in a vertical and/or horizontal direction at predetermined places on the lower side floor slab portion 20 to be installed, to form an embedded formwork 24 with a desired shape; the embedded formwork 24 is fixed via a fixing member 23; and concrete is installed between the embedded formworks 24, 24 in the above state, to form a main beam portion 5 and an upper side floor slab portion 7.SELECTED DRAWING: Figure 5

Description

It mainly relates to a method of constructing a pile support structure constituting a pile support structure such as a dolphin or a pier.

Pile support structures such as dolphins and piers have a structure in which concrete superstructures are supported by a plurality of steel pipe piles placed on the bottom ground.

This concrete superstructure is provided with a grid-like beam structure supported by steel pipe piles, and a floor slab is formed on the beam structure.

The beam structure includes a joint portion joined to the head of each steel pipe pile and a main beam portion connecting adjacent joint portions, and is formed in a plan view grid pattern.

Conventionally, in order to construct such a lattice-shaped beam structure and a floor slab portion on the beam structure, as shown in FIG. 22, after placing the steel pipe piles 50, 50 ... The support beam members 51, 51 are supported by 50, and the reinforcing bars are arranged using the support beam members 51, 51, and the formwork 52 is formed so as to straddle the steel pipe piles 50, 50. do.

In the formwork 52 forming the beam structure and the floor slab portion, a separator is arranged between the formwork plates 53 and 53 facing each other to support the formwork plates 53 and 53 with each other and to form the main beam portion. The formwork plates 53 and 53 and the formwork plate 54 forming the bottom surface of the floor slab are supported by the support members 55 and 55 installed in the support work.

Then, concrete is cast between the formwork, cured and solidified, and then the separator and the formwork plate are removed to integrate the lattice-shaped beam structure having a cavity between the beam portions and the upper surface thereof. The floor slab is formed.

On the other hand, in the construction of this type of pile support structure, one or more concrete precast members constituting the beam are manufactured in advance at a factory or a manufacturing yard on land, and the precast members are transported to a construction site to form a steel pipe pile. There is also known a construction method in which the precast member is supported on the head and a filler such as concrete is placed between the pile head and the precast member in that state to join the precast member to the pile head. (See, for example, Patent Document 1).

In such a precast member, a formwork plate for forming a beam portion supported by each other via a separator is erected on a flat floor slab, and a formwork plate for forming a floor slab portion is provided via a support work. It is formed by assembling a formwork with support and placing concrete in the formwork.

Japanese Unexamined Patent Publication No. 2008-14083

However, in the conventional technique as described above, after forming the beam structure and the floor slab, it is necessary to remove the formwork used for the formation, so that the work is laborious and the work efficiency is improved. There was a problem that it was bad.

In particular, when assembling a formwork at a construction site on the water, the formwork must be assembled and disassembled on the water, which is greatly affected by sea conditions, weather conditions, etc., and has a problem that the construction period is prolonged. there were.

Further, when the beam structure is formed of the precast member, the lower surface side of the precast member is blocked by the floor slab, and the formwork plate, the support work, etc. cannot be removed from the lower side. Or, it was necessary to provide a hole for removal work in the floor slab.

Therefore, in view of such a conventional problem, the present invention has been made for the purpose of providing a method for constructing a pile support structure capable of efficiently performing work without having to remove the formwork.

The feature of the invention according to claim 1 for solving the conventional problem as described above is a beam structure formed by a main beam portion supported by a pile columnar body and supported on the beam structure. In the method of constructing a pile support structure provided with an upper deck portion, concrete is cast on a lower mold member laid on the support to form a lower deck portion, and then the lower side thereof. One or more block-shaped lightweight embedded frame members are installed side by side in the vertical and / or horizontal directions at a predetermined location on the deck to form a buried mold of a desired shape, and one end of the rod-shaped fixing member. Is connected to the anchor member embedded in the lower floor slab, and the other end is fixed to the lifting prevention holding member arranged on the upper surface of the embedded beam, and in that state, concrete is formed between the embedded frames. Is placed to form the main beam portion, and concrete is cast onto the main beam portion and the embedded mold to form the upper deck portion.

The feature of the invention according to claim 2 is that, in addition to the configuration of claim 1, an insertion hole penetrating the embedded formwork is provided, and one end of the fixing member is embedded in the lower deck portion through the insertion hole. It is to be connected to the anchor member.

The feature of the invention according to claim 3 is that, in addition to the configuration of claim 1 or 2, the lift-preventing pressing member is formed in the shape of a long plate and is placed over the upper surfaces of the plurality of embedded formwork. To be.

The feature of the invention according to claim 4 is that, in addition to the configuration of claim 2, a diameter-expanded portion is formed on the upper surface portion of the embedded formwork by expanding the diameter of the upper edge portion of the insertion hole. The purpose is to place the lifting member for preventing lifting on the bottom portion.

The feature of the invention according to claim 5 is that, in addition to the configuration of any one of claims 2 to 4, a guide tube is fitted inside the insertion hole, and the upper end surface of the guide tube is pressed to prevent lifting. The purpose is to support the members.

The feature of the invention according to claim 6 is that, in addition to the configuration of any one of claims 1 to 5, a gap is provided between the buried formwork arranged between the main beams, and concrete is cast in the gap. The purpose is to form an auxiliary beam between the main beams.

The feature of the invention according to claim 7 is that, in addition to the configuration of any one of claims 1 to 5, the buried formwork is stacked on the upper part, and adjacent lightweight buried formwork members of different heights are placed on each other. The present invention is to form an auxiliary beam having a height different from that of the main beam portion by placing concrete between the adjacent lightweight buried formwork members having different heights.

The feature of the invention according to claim 8 is that, in addition to the configuration of any one of claims 1 to 7, a part of the lightweight buried formwork members to be stacked is formed low, and the height is raised on the upper surface portion of the buried formwork. The purpose is to form different steps.

A feature of the invention according to claim 9 is that, in addition to the configuration of any one of claims 1 to 8, an inclined portion inclined outward and downward is formed on the upper edge portion of the embedded formwork.

A feature of the invention according to claim 10 is that, in addition to the configuration of any one of claims 1 to 9, an outwardly inclined inclined wall is formed on a side surface portion of the embedded formwork.

The feature of the invention according to claim 11 is that, in addition to the configuration of any one of claims 1 to 10, the side surface portion of the embedded formwork is formed into a mountain-shaped cross section protruding outward.

The feature of the invention according to claim 12 is that, in addition to the configuration of any one of claims 1 to 11, one or a plurality of block-shaped lightweight buried formwork members are stacked between the buried formwork to have a desired height. A pair of main beam portions parallel to each other are formed by installing a buried formwork for the main beam and placing concrete between the buried formwork and the main beam formwork.

A feature of the invention according to claim 13 is that, in addition to the configuration of any one of claims 1 to 12, the support is a support work supported by the pile columnar body.

The feature of the invention according to claim 14 is that, in addition to the configuration of any one of claims 1 to 12, the lower formwork member is a flat formwork-combined concrete installed on the ground that also serves as the support. In the case of concrete, a precast concrete structure having the lower floor slab and the beam structure is constructed in advance on the leveling concrete that also serves as a formwork, and then the precast concrete structure is used as the pile columnar body. To support it.

The feature of the invention according to claim 15 is that, in addition to the configuration of any one of claims 1 to 14, the lightweight embedded formwork member is formed in a block shape by a foamed resin.

The method for constructing the pile support structure according to the present invention has a high degree of freedom in designing the shape of the beam structure by providing the configuration of claim 1, omits the work of removing the formwork, and efficiently constructs a concrete structure. You can build your body. Further, since the lower surface of the concrete structure is closed by the lower deck portion, the connecting portion (spray zone) with the pile column is not exposed to the water surface, and the durability can be improved.

Further, in the present invention, by providing the configuration of claim 2, it is possible to prevent (avoid) interference with the beam reinforcing bar when installing the fixing member.

Further, in the present invention, by providing the configuration of claim 3, it is possible to hold down a plurality of buried formwork at once.

Furthermore, in the present invention, by providing the configuration of claim 4, the lifting prevention pressing member does not have to be exposed on the upper surface of the embedded formwork, and the lower surface of the upper deck portion can be formed flat.

Further, in the present invention, by providing the configuration of claim 5, the height of the lifting prevention holding member can be kept constant, and the plurality of stacked lightweight buried formwork members are lifted and displaced in the horizontal direction. Can be prevented.

Further, in the present invention, by providing the configurations of claims 6 to 7, auxiliary beams and small beams can be provided at arbitrary positions based on the strength design.

Further, in the present invention, by providing the configuration of claim 8, the thickness of the upper deck portion can be changed as needed.

Further, in the present invention, by providing the configuration of claim 9, a haunch can be easily formed at the connection portion between the main beam and the upper deck.

Further, in the present invention, by providing the configurations of claims 10 to 12, it is possible to form a main beam portion having a cross-sectional shape (cross-sectional trapezoidal shape, spindle shape, double wall shape) according to the design specifications.

Furthermore, in the present invention, by providing the configuration of claim 13, the work can be performed on water.

Further, in the present invention, by providing the configuration of claim 14, it can be applied to the construction of a precast member in a factory, a yard, or the like, and it is not necessary to remove the formwork member, so that the formwork is removed. It is not necessary to provide a hole for the upper floor slab, and the upper floor slab can be integrally formed.

Furthermore, in the present invention, by providing the configuration of claim 15, it is easy to process and it is possible to correspond to various shapes according to a request.

It is a front view which shows an example of the pile support structure constructed by the construction method of the pile support structure which concerns on this invention. It is a partially enlarged cross-sectional view which shows the state of the support construction installation process in the construction method of the pile support structure of the same above. It is a partially enlarged vertical cross-sectional view which shows the state which the lower floor slab part was formed in the same above. It is a partially enlarged cross-sectional view which shows the same bar arrangement. It is a partially enlarged vertical cross-sectional view which shows the state in which the above-mentioned buried formwork is installed. It is a top view which shows the state which installed the above-mentioned buried formwork. (a) is a vertical cross-sectional view showing the same buried formwork, and (b) is a plan view of the same. (A) to (e) are partially enlarged cross-sectional views showing the outline of the installation process of the buried formwork as described above. It is a vertical cross-sectional view which shows the state which the concrete was placed in the same as above. It is a vertical cross-sectional view which shows the other embodiment of the construction method of the pile support structure which concerns on this invention. It is a vertical cross-sectional view which shows the other embodiment of the construction method of the pile support structure which concerns on this invention. It is a vertical cross-sectional view which shows the other embodiment of the construction method of the pile support structure which concerns on this invention. It is a vertical cross-sectional view which shows the other embodiment of the construction method of the pile support structure which concerns on this invention. It is a vertical cross-sectional view which shows the other embodiment of the construction method of the pile support structure which concerns on this invention. It is a vertical cross-sectional view which shows the other embodiment of the construction method of the pile support structure which concerns on this invention. It is still another embodiment of the method of constructing a pile support structure which concerns on this invention, and is the top view which shows the state which installed the buried formwork. It is a top view which shows an example of another fixing method of the buried formwork in the method of constructing a pile support structure which concerns on this invention. It is an enlarged vertical sectional view which shows the state between the buried formwork of the same above. It is a vertical cross-sectional view which shows the state which the concrete was placed in the same as above. It is a vertical cross-sectional view which shows the other embodiment of the construction method of the pile support structure which concerns on this invention, (a) is the state which installed the leveling concrete part which also serves as a formwork, (b) is the same lower floor slab. It is a figure which shows the state which formed the part, (c) is the state which installed the lightweight embedded formwork member, and (d) is the state which the precast concrete body was formed. It is a schematic plan view of FIG. 20B of the same above. It is a vertical cross-sectional view which shows the mode of the construction method of the conventional pile support structure.

Next, the first embodiment of the method for constructing a pile support structure according to the present invention will be described based on the examples shown in FIGS. 1 to 19.

In this embodiment, a case where a pile support structure 1 such as a pier is constructed by on-site construction will be described as an example, and the pile support structure 1 will be described as a plurality of pile support structures 1 cast on the bottom ground 2 as shown in FIG. A concrete structure 4 forming a superstructure is supported on pile columnar bodies 3, 3 ... Such as steel pipe piles. The reference numeral w in the figure is the water surface.

The concrete structure 4 is formed on a concrete beam structure 6 composed of a plurality of main beam portions 5, 5 ... Supported by pile columnar bodies 3, 3 ... And intersecting each other, and a beam structure 6. It is provided with an upper floor slab portion 7.

In order to construct the concrete structure 4, first, as shown in FIG. 2, the supports 8 and 8 are attached to the supports 8 and 8 with the piled columnar bodies 3, 3 ... As shown in FIG. A support girder 9 made of H-shaped steel is supported, and each support girder 9 is supported, and a support beam 10 is erected between the pile columnar bodies 3, 3 ....

Next, a plurality of joists 11 and 11 are erected on the support beam member 10 at intervals, and a lower formwork member 12 is laid on the joists 11 and 11, and an area in which the concrete structure 4 is constructed. A flat lower formwork is formed over the entire lower surface of the.

Further, as shown in FIG. 6, an outer formwork that covers the outside of the entire area where the concrete structure 4 is constructed is installed so as to surround the lower surface and the side surface of the entire concrete structure 4.

Then, as shown in FIGS. 3 and 4, a plurality of rod-shaped lower floor slab main bars 13, 13 ... Are arranged on the lower formwork member 12 at horizontal intervals, and the main beam portion is provided. A main bar group 14 composed of a plurality of main bars directed in the direction between the adjacent pile column bodies 3, 3 is formed according to the positions where the 5, 5 ... Are formed.

As shown in FIG. 4, the main muscle group 14 is arranged in two upper and lower stages at the same height as the lower floor slab main bars 13, 13 ... The beam main bars 15, 15 ... and the rod-shaped upper deck main bars 16, 16 ... It is provided with the main bars 17, 17 ... For the upper beam.

Then, beam side surface reinforcing bars 18, 18 ... Are arranged on both sides between the upper and lower beam main bars at intervals, and shear reinforcing bars 19, 19 ... The cage-shaped main muscle group 14 is formed by restraining with.

When the reinforcement arrangement is completed, concrete is cast on the lower formwork member 12 to form a flat plate-shaped lower deck portion 20 having a certain thickness.

In the lower floor slab portion 20, the lower floor slab main bars 13, 13 ... Are embedded, and the upper lower beam main bars 15, 15 ... Are exposed on the lower floor slab 20. The lower end portions of the shear reinforcing bars 19, 19 ... Are also embedded in the lower deck portion 20.

An anchor member 21 is embedded in each lower deck portion 20 at a predetermined position, that is, at a position where a buried formwork 24, which will be described later, is installed, with the connecting portion at the upper end protruding from the upper surface.

Then, after curing the concrete constituting the lower floor slab portion 20 for a certain period of time, as shown in FIGS. 5 to 8, the lower floor slab portion 20 is surrounded by a predetermined portion, that is, the main muscle group 14. One or more block-shaped lightweight buried formwork members 22, 22 ... Are installed side by side in the vertical and horizontal directions in the space, and the buried formwork 24 having a desired shape for forming the main beam portions 5, 5 ... Is provided. Form.

The lightweight buried formwork members 22, 22 ... Are formed in a fixed solid block shape by a foamed resin such as styrofoam having water repellency and flame retardancy, and are fixed members that penetrate in the vertical direction according to the position of the anchor member 21. An insertion hole 28 through which the 23 is inserted is formed.

This lightweight buried type frame member 22, 22, together with the unit weight is 0.12~0.35kN / ^{m 3} and weight, the allowable compressive stress has a high strength and 20~200kN / ^{m 2} .. Further, the lightweight buried formwork members 22, 22 ... Are excellent in workability, can be processed into a desired shape by a saw, a heating wire, or the like at the site, and can correspond to a beam shape having a curved surface. There is.

Then, each of the lightweight buried formwork members 22 and 22 is processed into a desired shape by a processing tool such as a saw or a heating wire according to the shape of the main beam portion 5 and the upper floor slab portion 7 to be constructed at the construction site. , The embedded formwork 24 having a desired height and shape is formed by stacking them side by side in the vertical and horizontal directions.

In this embodiment, a part of the lightweight buried formwork members 22 to be stacked is formed low, and stepped portions 24a having different heights are formed on the upper surface portion of the buried formwork 24.

In the work of stacking the lightweight buried formwork members 22 and 22, as shown in FIG. 8B, first, the lower end of the fixing member 23 is screwed into the anchor member 21 embedded in the lower deck portion 20. The fixing member 23 is erected on the lower floor slab 20 by connecting them.

The fixing member 23 is formed in a rod shape and has screw portions at the top and bottom. The screw portion at the lower end can be screwed into the anchor member 21, and the fixing nut 26 is screwed into the screw portion at the upper end to lift the fixing member 23. It can be fixed to the prevention holding member 25.

Next, as shown in FIG. 8C, while passing the fixing member 23 through the insertion hole 28, the lowermost lightweight buried formwork member 22 is hung and placed on the lower deck portion 20. After that, the guide tube 29 is fitted to the outside of the fixing member 23 and the inside of the insertion hole 28.

The guide pipe 29 is composed of a pipe body such as a vinyl chloride pipe or a steel pipe, and its end is cut according to the height of each embedded form 24 to be installed, and the length is adjusted.

Then, as shown in FIG. 8D, the insertion holes 28 are fitted into the guide pipe 29, and while guiding the guide pipe 29, the lightweight buried formwork members 22 and 22 at each stage are suspended, and a plurality of lightweight buried molds are suspended. The frame members 22, 22 are stacked. As an auxiliary fixing method between the stacked lightweight formwork members 22, the lightweight formwork members 22 may be fixed by using an adhesive or an adhesive tape.

A diameter-expanded portion 28a with an enlarged diameter of the upper edge portion of the insertion hole 28 is formed on the upper surface portion of the uppermost lightweight formwork member 22, that is, the upper surface portion of the embedded formwork 24, and the diameter-expanded portion 28a rises. The prevention pressing member 25 is fitted, and the lifting prevention pressing member 25 is placed on the bottom of the enlarged diameter portion 28a. The upper surface portion of the buried form 24 refers to a portion on the upper surface side of the buried form 24 that is pressed by the lifting prevention pressing member 25, and is a concave expansion that opens on the upper surface and the upper surface of the buried form 24. It is assumed that the diameter portion 28a is included.

Further, the lifting prevention pressing member 25 is supported on the upper end surface of the guide pipe 29, and the upper end portion of the fixing member 23 is passed through the lifting prevention pressing member 25 and protrudes from the lifting prevention pressing member 25.

The lift-preventing pressing member 25 is made of a steel plate, a reinforced plastic plate, or the like, and has a protruding hole formed in the center through which the tip of the fixing member 23 is inserted.

Then, the fixing nut 26 is screwed into the upper end portion of the fixing member 23, and the upper end portion of the fixing member 23 is fixed to the lifting prevention pressing member 25.

After that, as shown in FIG. 8E, the enlarged diameter portion 28a is filled with a backfill material 28b such as sand or slag, and the installation is completed. It is desirable that the width dimension of the lifting prevention holding member 25 to be used is equal to or larger than the diameter width of the guide pipe 29 so that no gap is formed on the upper surface of the guide pipe 29.

Then, as shown in FIG. 9, in this state, concrete is cast between the buried formwork 24, 24 to form the main beam portions 5, 5 ..., And the cast main beam portions 5, 5 ... Concrete is cast on the buried form 24 to form the upper deck portion 7.

When the concrete is cast, the lightweight buried formwork members 22, 22 ... Are in a state of being pressed against the lower deck portion 20 side by the lifting prevention pressing member 25 and the fixing member 23, and the concrete lifts and lifts. Lateral displacement is prevented, and the main beam portions 5, 5 ... And the upper floor slab portion 7 are formed in a predetermined shape.

Further, since each of the uppermost lightweight buried formwork members 22 is provided with a chamfering inclined portion 22a at the upper edge portion, the cross-sectional triangle is formed at the connecting portion between the main beam portions 5, 5 ... And the upper floor slab portion 7. The shaped haunch 5a can be easily formed. Reference numeral 27 in the drawing is an oblique streak embedded in the haunch 5a.

Then, the concrete is cured and solidified, and the concrete structure 4 in a state where the lightweight buried formwork members 22, 22 ... And the fixing member 23 are embedded inside is constructed, and finally the support work is removed to complete the work. ..

In the method for constructing the pile support structure configured in this way, since the buried formwork 24 composed of the lightweight buried formwork members 22, 22 ... Is left in the concrete structure 4, the work of removing the formwork is omitted. It is possible to work efficiently.

Further, since the lower surface of the concrete structure 4 to be constructed is closed by the lower deck portion 20, the joint portion between the pile columnar bodies 3, 3 ... And the concrete (spray zone in the conventional structure) is on the water surface. Since it is not exposed, it prevents corrosion of the reinforcing bars arranged at the joint portion between the pile columnar bodies 3, 3 ... And the concrete, the lower surface of the lower deck portion 20, and the side surface side of the main beam portion 5, and has high durability. Can be obtained.

Furthermore, in this method of constructing the pile support structure, the workability of the lightweight buried formwork members 22, 22 ... Is excellent, so that the workability at the construction site is good, and the lightweight buried formwork members 22, 22 ... Are arranged. And, by combining the shapes, it is possible to obtain a high degree of design freedom regarding the shape of the beam structure 6, that is, the cross section (thickness) of the main beam portion 5 and the upper deck portion 7, and flexibly respond to design changes. It is possible to cope with cases where there is a difference in the loading load acting on the upper floor slab portion 7 depending on the location.

For example, as shown in FIG. 10, the buried form 24 may be formed only by stacking the lightweight buried form members 22, 22 ... Formed in a fixed block shape, and arranged between the main beam portions 5, 5. The buried formwork 24 may be arranged at intervals from each other, and concrete may be cast between the buried formwork 24 to form an auxiliary beam between the main beams.

Further, as shown in FIGS. 11 and 12, an integral buried formwork 24 is formed by arranging the adjacent lightweight buried formwork members 22 and 22 stacked on the upper part so as to be in contact with each other, and then on the upper part. A part of the joint portion of the stacked adjacent lightweight buried formwork members 22 and 22 is cut off to form a groove between the lightweight buried formwork members 22 and 22, and formed between the adjacent lightweight buried formwork members 22 and 22. Concrete may be cast in the groove to form an auxiliary beam 30 having a height different from that of the main beam portion 5. It should be noted that the lightweight buried formwork members 22, 22 which have been partially cut out so that the auxiliary beam 30 can be provided from the beginning may be stacked to form a groove for forming the auxiliary beam 30.

Further, as shown in FIG. 13, the inclined walls 31 and 31 inclined outward and downward may be formed on the side surface portion of the buried form 24, and the main beam portion 5 may be formed in a trapezoidal cross section, as shown in FIG. In addition, the side surface portion of the embedded form 24 may be formed on the projecting portions 32, 32 having a mountain-shaped cross section protruding outward, and the tapered portions 33, 33 may be formed on the side surface portion of the main beam portion 5.

Further, as shown in FIG. 15, one or a plurality of block-shaped lightweight buried formwork members 22 and 22 are stacked between the buried formwork 24 to install a main beam buried formwork 34 having a desired height, and the formwork is buried. Concrete may be cast between the formwork 24 and the main beam formwork 34 to form a pair of main beam portions 35, 35 parallel to each other.

Further, since the lightweight buried formwork member 22 can be freely processed, it can also correspond to a circular or arcuate beam as shown in FIG.

In the above-described embodiment, the upper surface of the buried form 24 is provided with a diameter-expanded portion 28a having an enlarged diameter at the upper edge of the insertion hole 28 penetrating the buried form 24, and the diameter-expanded portion 28a rises to the bottom. By placing the prevention holding member 25 and fixing the upper end portion of the fixing member 23 passed through the insertion hole 28 to the lifting prevention holding member 25, the embedded form 24 is pressed against the lower deck portion 20. However, the mode of fixing the buried form 24 is not limited to this, and for example, the lifting prevention pressing member 25 similar to the above-described embodiment is inserted into the insertion hole 28 without providing the enlarged diameter portion 28a. It may be placed on the upper end edge, that is, on the upper surface of the embedded form 24.

Further, as in the examples shown in FIGS. 17 to 19, long plate-shaped lifting prevention holding members 47, 47 ... made of angle steel, channel steel, steel plate, etc. are placed on the upper surfaces of the embedded formwork 24, 24. It may be placed. The same reference numerals are given to the same configurations as those in the above-described embodiment, and the description thereof will be omitted.

In this embodiment, the lightweight buried formwork members 22, 22 ... Are stacked, and when the installation of the buried formwork 24 is completed, the long plate-shaped lifting prevention holding members 47, 47 are placed on the adjacent buried formwork 24, 24. ... Is bridged and placed, one end of the rod-shaped fixing member 23 is connected to the lifting prevention holding member 47, and the other end is connected to the anchor member 21 embedded in the lower floor slab portion 20 for lightweight embedding. The buried form 24 formed by stacking the form members 22, 22 ... Is pressed down.

Through holes 47a are formed at predetermined positions in the longitudinal direction of the lifting prevention pressing members 47, 47 .... As shown in FIG. 18, a rod-shaped fixing member 23 is passed through the through holes 47a, and the lower end is lowered. It is connected to the anchor member 21 embedded in the side deck portion 20, and the upper end is connected to the lifting prevention holding member 47.

The fixing member 23 is formed in a rod shape and has screw portions at the top and bottom. The screw portion at the lower end can be screwed into the anchor member 21, and the fixing nut 26 is screwed into the screw portion at the upper end to lift the fixing member 23. It can be fixed to the preventive holding members 47, 47 ...

When the long plate-shaped pressing members 47, 47 ... For preventing lifting are used, as shown in FIG. 18, the fixing member 23 can be installed between the adjacent buried formwork 24, 24. By using it together with the fixing member 23 through the insertion hole 28, the embedded form 24 can be pressed more stably.

Reference numeral 48 in the drawing is a shear reinforcing bar for auxiliary beams installed between adjacent buried formwork 24, 24, and the lower end of the lower floor slab main bar 15 is buried in the lower deck portion 20. The upper end is connected to the upper floor slab main bar 17 arranged on the lifting prevention holding member 47. The lower beam main bar 15 and the upper beam main bar 17 are different from the other lower deck main bars 13 and the upper deck main bar 16 arranged at the same level according to the required strength of the auxiliary beam. The diameter may be changed to that of the reinforcing bar, or the lower auxiliary beam main bar and the upper auxiliary beam main bar may be arranged in two stages in the same manner as the main beam portions 5, 5 ....

Then, as shown in FIG. 19, in this state, concrete is cast between the buried formwork 24, 24 to form the main beam portions 5, 5 ... And the auxiliary beam portion 30, and the cast main beam portion is formed. 5, 5 ..., Concrete is cast on the auxiliary beam portion 24 and the buried formwork 24, 24 to form the upper deck portion 7.

When the concrete is cast, the lightweight buried formwork members 22, 22 ... Constituting the buried formwork 24 are pressed against the lower deck portion 20 side by the lifting prevention pressing member 47 fixed by the fixing member 23. In this state, the concrete is prevented from being lifted and displaced, and the main beam portions 5, 5 ..., the auxiliary beam portion 30, and the upper floor slab portion 7 are formed in a predetermined shape.

In the above-described embodiment, the case where the concrete structure 4 supported by the pile columnar bodies 3, 3 ... Is constructed by on-site construction has been described, but the method of the present invention describes the pile columnar body as shown in FIG. It can also be applied to the production of the precast concrete structure 40 supported by 3, 3 ... The same components as those in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted.

In this embodiment, a flat formwork leveling concrete 42 installed on the ground 41 that also serves as a support is used as the lower formwork member, and the lower floor slab is previously placed on the formwork leveling concrete 42. After constructing the precast concrete structure 40 provided with the portion 20 and the beam structure 6, the precast concrete structure 40 is supported by the pile column bodies 3, 3 ...

As shown in FIG. 20A, the formwork-combined leveling concrete 42 is formed into a floor slab having a flat upper surface by placing concrete on a base 43 made of crushed stone or the like constructed on a flat ground 41. It is formed, and a structure in which the lower form member and the support supporting the lower formwork member are integrated is formed.

Further, although not particularly shown, an outer formwork plate that covers the outside of the entire area where the precast concrete structure 40 is constructed is installed so as to surround the side surface of the entire area where the concrete structure 4 is constructed.

Then, as shown in FIG. 20B, a plurality of rod-shaped lower floor slab main bars 13, 13 ... Are arranged on the formwork-combined leveling concrete 42 at intervals in the horizontal direction, and the main beam portion is formed. A main bar group 14 composed of a plurality of main bars directed in the longitudinal direction of the beam is formed according to the positions where the auxiliary beam portions 45 are formed.

Further, as shown in FIG. 21, a cylindrical formwork member for forming a vertically penetrating hole to which the pile columnar bodies 3, 3 ... Are joined is formed at a portion where the main beam portions 5, 5 ... Alternatively, a sheath tube 44 is arranged.

After the reinforcement is completed, the edge cutting sheet 49 is laid on the formwork leveling concrete 42 so that the concrete forming the lower floor slab 20 does not adhere to the formwork leveling concrete 42, and then the concrete is placed. It is cast to form a flat plate-shaped lower deck portion 20 having a certain thickness.

In the lower floor slab portion 20, the lower floor slab main bars 13, 13 ... Are embedded, and the upper lower beam main bars 15, 15 ... Are exposed on the lower floor slab 20. The lower end portions of the shear reinforcing bars 19, 19 ... Are also embedded in the lower deck portion 20.

An anchor member 21 is embedded in each lower deck portion 20 in a state where the connecting portion at the upper end protrudes from the upper surface at a predetermined position.

Then, after curing the concrete constituting the lower floor slab portion 20 for a certain period of time, as shown in FIG. 20 (c), the concrete is surrounded by a predetermined portion on the lower floor slab portion 20, that is, the main muscle group 14. The block-shaped lightweight buried formwork members 22, 22 ... Are piled up in the space to form the buried formwork 24 having a desired shape for forming the main beam portions 5, 5 ....

Further, the lightweight buried formwork members 22, 22 ... Adjacent to each other in a predetermined direction are spaced apart from each other with the reinforcing bar group 14 for the auxiliary beam 45 sandwiched in the space surrounded by the main bar group 14 on the lower deck portion 20. To form a gap for forming the auxiliary beam portion 45 between the two lightweight buried form 24 members. When it is not necessary to form the auxiliary beam portion 45, it can be dealt with by adjusting the manufacturing dimensions of the lightweight buried formwork member 22 installed in the space surrounded by the main bar group 14. Further, the auxiliary beam 45 does not have to have a depth up to the upper part of the lower floor slab portion 20, and may have a predetermined depth set by adjusting the manufacturing dimensions of the lightweight buried formwork member 22.

Then, when the installation of the lightweight buried formwork members 22, 22 ... Is completed, the lifting prevention pressing member 25 supported by the guide pipe is supported, and one end of the rod-shaped fixing member 23 is connected to the lifting prevention pressing member 25. At the same time, the other end is connected to the anchor member 21 embedded in the lower deck portion 20, and the lightweight embedded formwork members 22, 22 ... Are fixed.

Then, in this state, concrete is cast between the lightweight buried formwork members 22, 22 ... To form the main beam portions 5, 5 ... And the auxiliary beam portions 45, and the cast main beam portions 5, 5 ... , Auxiliary beam portion 45 and lightweight buried formwork members 22, 22 ... Concrete is cast on the auxiliary beam portion 45 to form the upper floor slab portion 7.

When the concrete is cast, the lightweight buried formwork members 22, 22 ... Are in a state of being pressed against the lower deck portion 20 side by the lifting prevention pressing member 25 fixed by the fixing member 23, and the concrete. Since the floating and the displacement due to the above-mentioned are prevented, the main beam portions 5, 5 ..., the auxiliary beam portion 45, and the upper deck portion 7 are formed in a predetermined shape. As an auxiliary fixing method between the stacked lightweight formwork members 22, the lightweight formwork members 22 may be fixed by using an adhesive or an adhesive tape.

Then, the concrete is cured and solidified, and the precast concrete structure 40 in a state where the lightweight buried formwork members 22, 22 ..., the lifting prevention holding member 25 and the fixing member 23 are embedded in the concrete structure 4 is constructed. ..

As shown in FIG. 20D, the constructed precast concrete structure 40 is lifted by a crane or the like and joined to the heads of the pile columnar bodies 3, 3 ... Reference numeral 46 in the drawing is a lifting wire.

Further, in the above-described embodiment, the case where the lightweight buried formwork members 22, 22 ... Are made of foamed resin has been described, but the materials of the lightweight buried formwork members 22, 22 ... Are not limited to this, and are lightweight and lightweight. Any material having sufficient strength may be used, and for example, a corrugated cardboard material may be used for formation.

1 Pile support structure 2 Underwater ground 3 Pile columnar body 4 Concrete structure 5 Main beam part 6 Beam structure 7 Upper floor slab part 8 Support tool 9 Support girder material 10 Support beam material 11 Root 12 Lower type Frame member 13 Lower floor slab main reinforcement 14 Main reinforcement group 15 Lower beam main reinforcement 16 Upper floor slab main reinforcement 17 Upper beam main reinforcement 18 Beam side reinforcement 19 Shear reinforcement 20 Lower floor slab 21 Anchor member 22 Lightweight embedded type Frame member 23 Fixing member 24 Embedded mold 25 Lifting prevention holding member 26 Fixing nut 27 Oblique bar 28 Insertion hole 29 Guide pipe 30 Auxiliary beam 31 Inclined wall 32 Protruding part 33 Tapered part 34 Embedded mold for main beam 35 Main beam 40 Precast concrete structure 41 Above ground 42 Flattened concrete for both form frame 43 Base 44 Sheath pipe 45 Auxiliary beam 46 Wire 47 Lifting prevention holding member 48 Auxiliary tension shear reinforcing reinforcing bar 49 Edge cutting sheet

It mainly relates to a method of constructing a pile support structure constituting a pile support structure such as a dolphin or a pier.

Pile support structures such as dolphins and piers have a structure in which concrete superstructures are supported by a plurality of steel pipe piles placed on the bottom ground.

This concrete superstructure is provided with a grid-like beam structure supported by steel pipe piles, and a floor slab is formed on the beam structure.

The beam structure includes a joint portion joined to the head of each steel pipe pile and a main beam portion connecting adjacent joint portions, and is formed in a plan view grid pattern.

Conventionally, in order to construct such a lattice-shaped beam structure and a floor slab portion on the beam structure, as shown in FIG. 22, after placing the steel pipe piles 50, 50 ... The support beam members 51, 51 are supported by 50, and the reinforcing bars are arranged using the support beam members 51, 51, and the formwork 52 is formed so as to straddle the steel pipe piles 50, 50. do.

In the formwork 52 forming the beam structure and the floor slab portion, a separator is arranged between the formwork plates 53 and 53 facing each other to support the formwork plates 53 and 53 with each other and to form the main beam portion. The formwork plates 53 and 53 and the formwork plate 54 forming the bottom surface of the floor slab are supported by the support members 55 and 55 installed in the support work.

Then, concrete is cast between the formwork, cured and solidified, and then the separator and the formwork plate are removed to integrate the lattice-shaped beam structure having a cavity between the beam portions and the upper surface thereof. The floor slab is formed.

On the other hand, in the construction of this type of pile support structure, one or more concrete precast members constituting the beam are manufactured in advance at a factory or a manufacturing yard on land, and the precast members are transported to a construction site to form a steel pipe pile. There is also known a construction method in which the precast member is supported on the head and a filler such as concrete is placed between the pile head and the precast member in that state to join the precast member to the pile head. (See, for example, Patent Document 1).

In such a precast member, a formwork plate for forming a beam portion supported by each other via a separator is erected on a flat floor slab, and a formwork plate for forming a floor slab portion is provided via a support work. It is formed by assembling a formwork with support and placing concrete in the formwork.

Japanese Unexamined Patent Publication No. 2008-14083

However, in the conventional technique as described above, after forming the beam structure and the floor slab, it is necessary to remove the formwork used for the formation, so that the work is laborious and the work efficiency is improved. There was a problem that it was bad.

In particular, when assembling a formwork at a construction site on the water, the formwork must be assembled and disassembled on the water, which is greatly affected by sea conditions, weather conditions, etc., and has a problem that the construction period is prolonged. there were.

Further, when the beam structure is formed of the precast member, the lower surface side of the precast member is blocked by the floor slab, and the formwork plate, the support work, etc. cannot be removed from the lower side. Or, it was necessary to provide a hole for removal work in the floor slab.

Therefore, in view of such a conventional problem, the present invention has been made for the purpose of providing a method for constructing a pile support structure capable of efficiently performing work without having to remove the formwork.

The feature of the invention according to claim 1 for solving the conventional problem as described above is a beam structure formed by a main beam portion supported by a pile columnar body and supported on the beam structure. In the method of constructing a pile support structure provided with an upper deck portion, concrete is cast on a lower mold member laid on the support to form a lower deck portion, and then the lower side thereof. One or more block-shaped lightweight embedded frame members are installed side by side in the vertical and / or horizontal directions at a predetermined location on the deck to form a buried mold of a desired shape, and one end of the rod-shaped fixing member. Is connected to the anchor member embedded in the lower floor slab, and the other end is fixed to the lifting prevention holding member arranged on the upper surface of the embedded beam, and in that state, concrete is formed between the embedded frames. Is placed to form the main beam portion, and concrete is cast onto the main beam portion and the embedded mold to form the upper deck portion.

The feature of the invention according to claim 2 is that, in addition to the configuration of claim 1, an insertion hole penetrating the embedded formwork is provided, and one end of the fixing member is embedded in the lower deck portion through the insertion hole. It is to be connected to the anchor member.

The feature of the invention according to claim 3 is that, in addition to the configuration of claim 1 or 2, the lift-preventing pressing member is formed in the shape of a long plate and is placed over the upper surfaces of the plurality of embedded formwork. To be.

The feature of the invention according to claim 4 is that, in addition to the configuration of claim 2, a diameter-expanded portion is formed on the upper surface portion of the embedded formwork by expanding the diameter of the upper edge portion of the insertion hole. The purpose is to place the lifting member for preventing lifting on the bottom portion.

The feature of the invention according to claim 5 is that, in addition to the configuration of any one of claims 2 to 4, a guide tube is fitted inside an insertion hole penetrating the embedded formwork , and the guide tube is fixed through the guide tube. One end of the member is connected to an anchor member embedded in the lower floor slab portion, and the upper end surface of the guide pipe supports the lifting prevention holding member.

The feature of the invention according to claim 6 is that, in addition to the configuration of any one of claims 1 to 5, a gap is provided between the buried formwork arranged between the main beams, and concrete is cast in the gap. The purpose is to form an auxiliary beam between the main beams.

The feature of the invention according to claim 7 is that, in addition to the configuration of any one of claims 1 to 5, the buried formwork is stacked on the upper part, and adjacent lightweight buried formwork members of different heights are placed on each other. The present invention is to form an auxiliary beam having a height different from that of the main beam portion by placing concrete between the adjacent lightweight buried formwork members having different heights.

The feature of the invention according to claim 8 is that, in addition to the configuration of any one of claims 1 to 7, a part of the lightweight buried formwork members to be stacked is formed low, and the height is raised on the upper surface portion of the buried formwork. The purpose is to form different steps.

A feature of the invention according to claim 9 is that, in addition to the configuration of any one of claims 1 to 8, an inclined portion inclined outward and downward is formed on the upper edge portion of the embedded formwork.

A feature of the invention according to claim 10 is that, in addition to the configuration of any one of claims 1 to 9, an outwardly inclined inclined wall is formed on a side surface portion of the embedded formwork.

The feature of the invention according to claim 11 is that, in addition to the configuration of any one of claims 1 to 10, the side surface portion of the embedded formwork is formed into a mountain-shaped cross section protruding outward.

The feature of the invention according to claim 12 is that, in addition to the configuration of any one of claims 1 to 11, one or a plurality of block-shaped lightweight buried formwork members are stacked between the buried formwork to have a desired height. The purpose is to install the buried formwork for the main beam, and to cast concrete between the buried formwork and the buried formwork for the main beam to form a pair of main beam portions parallel to each other.

A feature of the invention according to claim 13 is that, in addition to the configuration of any one of claims 1 to 12, the support is a support work supported by the pile columnar body.

The feature of the invention according to claim 14 is that, in addition to the configuration of any one of claims 1 to 12, the lower formwork member is a flat formwork-combined concrete installed on the ground that also serves as the support. In the case of concrete, a precast concrete structure having the lower floor slab and the beam structure is constructed in advance on the leveling concrete that also serves as a formwork, and then the precast concrete structure is used as the pile columnar body. To support it.

The feature of the invention according to claim 15 is that, in addition to the configuration of any one of claims 1 to 14, the lightweight embedded formwork member is formed in a block shape by a foamed resin.

The method for constructing the pile support structure according to the present invention has a high degree of freedom in designing the shape of the beam structure by providing the configuration of claim 1, omits the work of removing the formwork, and efficiently constructs a concrete structure. You can build your body. Further, since the lower surface of the concrete structure is closed by the lower deck portion, the connecting portion (spray zone) with the pile column is not exposed to the water surface, and the durability can be improved.

Further, in the present invention, by providing the configuration of claim 2, it is possible to prevent (avoid) interference with the beam reinforcing bar when installing the fixing member.

Further, in the present invention, by providing the configuration of claim 3, it is possible to hold down a plurality of buried formwork at once.

Furthermore, in the present invention, by providing the configuration of claim 4, the lifting prevention pressing member does not have to be exposed on the upper surface of the embedded formwork, and the lower surface of the upper deck portion can be formed flat.

Further, in the present invention, by providing the configuration of claim 5, the height of the lifting prevention holding member can be kept constant, and the plurality of stacked lightweight buried formwork members are lifted and displaced in the horizontal direction. Can be prevented.

Further, in the present invention, by providing the configurations of claims 6 to 7, auxiliary beams and small beams can be provided at arbitrary positions based on the strength design.

Further, in the present invention, by providing the configuration of claim 8, the thickness of the upper deck portion can be changed as needed.

Further, in the present invention, by providing the configuration of claim 9, a haunch can be easily formed at the connection portion between the main beam and the upper deck.

Further, in the present invention, by providing the configurations of claims 10 to 12, it is possible to form a main beam portion having a cross-sectional shape (cross-sectional trapezoidal shape, spindle shape, double wall shape) according to the design specifications.

Furthermore, in the present invention, by providing the configuration of claim 13, the work can be performed on water.

Further, in the present invention, by providing the configuration of claim 14, it can be applied to the construction of a precast member in a factory, a yard, or the like, and it is not necessary to remove the formwork member, so that the formwork is removed. It is not necessary to provide a hole for the upper floor slab, and the upper floor slab can be integrally formed.

Furthermore, in the present invention, by providing the configuration of claim 15, it is easy to process and it is possible to correspond to various shapes according to a request.

It is a front view which shows an example of the pile support structure constructed by the construction method of the pile support structure which concerns on this invention. It is a partially enlarged cross-sectional view which shows the state of the support construction installation process in the construction method of the pile support structure of the same above. It is a partially enlarged vertical cross-sectional view which shows the state which the lower floor slab part was formed in the same above. It is a partially enlarged cross-sectional view which shows the same bar arrangement. It is a partially enlarged vertical cross-sectional view which shows the state in which the above-mentioned buried formwork is installed. It is a top view which shows the state which installed the above-mentioned buried formwork. (a) is a vertical cross-sectional view showing the same buried formwork, and (b) is a plan view of the same. (A) to (e) are partially enlarged cross-sectional views showing the outline of the installation process of the buried formwork as described above. It is a vertical cross-sectional view which shows the state which the concrete was placed in the same as above. It is a vertical cross-sectional view which shows the other embodiment of the construction method of the pile support structure which concerns on this invention. It is a vertical cross-sectional view which shows the other embodiment of the construction method of the pile support structure which concerns on this invention. It is a vertical cross-sectional view which shows the other embodiment of the construction method of the pile support structure which concerns on this invention. It is a vertical cross-sectional view which shows the other embodiment of the construction method of the pile support structure which concerns on this invention. It is a vertical cross-sectional view which shows the other embodiment of the construction method of the pile support structure which concerns on this invention. It is a vertical cross-sectional view which shows the other embodiment of the construction method of the pile support structure which concerns on this invention. It is still another embodiment of the method of constructing a pile support structure which concerns on this invention, and is the top view which shows the state which installed the buried formwork. It is a top view which shows an example of another fixing method of the buried formwork in the method of constructing a pile support structure which concerns on this invention. It is an enlarged vertical sectional view which shows the state between the buried formwork of the same above. It is a vertical cross-sectional view which shows the state which the concrete was placed in the same as above. It is a vertical cross-sectional view which shows the other embodiment of the construction method of the pile support structure which concerns on this invention, (a) is the state which installed the leveling concrete part which also serves as a formwork, (b) is the same lower floor slab. It is a figure which shows the state which formed the part, (c) is the state which installed the lightweight embedded formwork member, and (d) is the state which the precast concrete body was formed. It is a schematic plan view of FIG. 20B of the same above. It is a vertical cross-sectional view which shows the mode of the construction method of the conventional pile support structure.

Next, the first embodiment of the method for constructing a pile support structure according to the present invention will be described based on the examples shown in FIGS. 1 to 19.

In this embodiment, a case where a pile support structure 1 such as a pier is constructed by on-site construction will be described as an example, and the pile support structure 1 will be described as a plurality of pile support structures 1 cast on the bottom ground 2 as shown in FIG. A concrete structure 4 forming a superstructure is supported on pile columnar bodies 3, 3 ... Such as steel pipe piles. The reference numeral w in the figure is the water surface.

The concrete structure 4 is formed on a concrete beam structure 6 composed of a plurality of main beam portions 5, 5 ... Supported by pile columnar bodies 3, 3 ... And intersecting each other, and a beam structure 6. It is provided with an upper floor slab portion 7.

In order to construct the concrete structure 4, first, as shown in FIG. 2, the supports 8 and 8 are attached to the supports 8 and 8 with the piled columnar bodies 3, 3 ... As shown in FIG. A support girder 9 made of H-shaped steel is supported, and each support girder 9 is supported, and a support beam 10 is erected between the pile columnar bodies 3, 3 ....

Next, a plurality of joists 11 and 11 are erected on the support beam member 10 at intervals, and a lower formwork member 12 is laid on the joists 11 and 11, and an area in which the concrete structure 4 is constructed. A flat lower formwork is formed over the entire lower surface of the.

Further, as shown in FIG. 6, an outer formwork that covers the outside of the entire area where the concrete structure 4 is constructed is installed so as to surround the lower surface and the side surface of the entire concrete structure 4.

Then, as shown in FIGS. 3 and 4, a plurality of rod-shaped lower floor slab main bars 13, 13 ... Are arranged on the lower formwork member 12 at horizontal intervals, and the main beam portion is provided. A main bar group 14 composed of a plurality of main bars directed in the direction between the adjacent pile column bodies 3, 3 is formed according to the positions where the 5, 5 ... Are formed.

As shown in FIG. 4, the main muscle group 14 is arranged in two upper and lower stages at the same height as the lower floor slab main bars 13, 13 ... The beam main bars 15, 15 ... and the rod-shaped upper deck main bars 16, 16 ... It is provided with the main bars 17, 17 ... For the upper beam.

Then, beam side surface reinforcing bars 18, 18 ... Are arranged on both sides between the upper and lower beam main bars at intervals, and shear reinforcing bars 19, 19 ... The cage-shaped main muscle group 14 is formed by restraining with.

When the reinforcement arrangement is completed, concrete is cast on the lower formwork member 12 to form a flat plate-shaped lower deck portion 20 having a certain thickness.

In the lower floor slab portion 20, the lower floor slab main bars 13, 13 ... Are embedded, and the upper lower beam main bars 15, 15 ... Are exposed on the lower floor slab 20. The lower end portions of the shear reinforcing bars 19, 19 ... Are also embedded in the lower deck portion 20.

An anchor member 21 is embedded in each lower deck portion 20 at a predetermined position, that is, at a position where a buried formwork 24, which will be described later, is installed, with the connecting portion at the upper end protruding from the upper surface.

Then, after curing the concrete constituting the lower floor slab portion 20 for a certain period of time, as shown in FIGS. 5 to 8, the lower floor slab portion 20 is surrounded by a predetermined portion, that is, the main muscle group 14. One or more block-shaped lightweight buried formwork members 22, 22 ... Are installed side by side in the vertical and horizontal directions in the space, and the buried formwork 24 having a desired shape for forming the main beam portions 5, 5 ... Is provided. Form.

The lightweight buried formwork members 22, 22 ... Are formed in a fixed solid block shape by a foamed resin such as styrofoam having water repellency and flame retardancy, and are fixed members that penetrate in the vertical direction according to the position of the anchor member 21. An insertion hole 28 through which the 23 is inserted is formed.

This lightweight buried type frame member 22, 22, together with the unit weight is 0.12~0.35kN / ^{m 3} and weight, the allowable compressive stress has a high strength and 20~200kN / ^{m 2} .. Further, the lightweight buried formwork members 22, 22 ... Are excellent in workability, can be processed into a desired shape by a saw, a heating wire, or the like at the site, and can correspond to a beam shape having a curved surface. There is.

Then, each of the lightweight buried formwork members 22 and 22 is processed into a desired shape by a processing tool such as a saw or a heating wire according to the shape of the main beam portion 5 and the upper floor slab portion 7 to be constructed at the construction site. , The embedded formwork 24 having a desired height and shape is formed by stacking them side by side in the vertical and horizontal directions.

In this embodiment, a part of the lightweight buried formwork members 22 to be stacked is formed low, and stepped portions 24a having different heights are formed on the upper surface portion of the buried formwork 24.

In the work of stacking the lightweight buried formwork members 22 and 22, as shown in FIG. 8B, first, the lower end of the fixing member 23 is screwed into the anchor member 21 embedded in the lower deck portion 20. The fixing member 23 is erected on the lower floor slab 20 by connecting them.

The fixing member 23 is formed in a rod shape and has screw portions at the top and bottom. The screw portion at the lower end can be screwed into the anchor member 21, and the fixing nut 26 is screwed into the screw portion at the upper end to lift the fixing member 23. It can be fixed to the prevention holding member 25.

Next, as shown in FIG. 8C, while passing the fixing member 23 through the insertion hole 28, the lowermost lightweight buried formwork member 22 is hung and placed on the lower deck portion 20. After that, the guide tube 29 is fitted to the outside of the fixing member 23 and the inside of the insertion hole 28.

The guide pipe 29 is composed of a pipe body such as a vinyl chloride pipe or a steel pipe, and its end is cut according to the height of each embedded form 24 to be installed, and the length is adjusted.

Then, as shown in FIG. 8D, the insertion holes 28 are fitted into the guide pipe 29, and while guiding the guide pipe 29, the lightweight buried formwork members 22 and 22 at each stage are suspended, and a plurality of lightweight buried molds are suspended. The frame members 22, 22 are stacked. As an auxiliary fixing method between the stacked lightweight formwork members 22, the lightweight formwork members 22 may be fixed by using an adhesive or an adhesive tape.

A diameter-expanded portion 28a with an enlarged diameter of the upper edge portion of the insertion hole 28 is formed on the upper surface portion of the uppermost lightweight formwork member 22, that is, the upper surface portion of the embedded formwork 24, and the diameter-expanded portion 28a rises. The prevention pressing member 25 is fitted, and the lifting prevention pressing member 25 is placed on the bottom of the enlarged diameter portion 28a. The upper surface portion of the buried form 24 refers to a portion on the upper surface side of the buried form 24 that is pressed by the lifting prevention pressing member 25, and is a concave expansion that opens on the upper surface and the upper surface of the buried form 24. It is assumed that the diameter portion 28a is included.

Further, the lifting prevention pressing member 25 is supported on the upper end surface of the guide pipe 29, and the upper end portion of the fixing member 23 is passed through the lifting prevention pressing member 25 and protrudes from the lifting prevention pressing member 25.

The lift-preventing pressing member 25 is made of a steel plate, a reinforced plastic plate, or the like, and has a protruding hole formed in the center through which the tip of the fixing member 23 is inserted.

Then, the fixing nut 26 is screwed into the upper end portion of the fixing member 23, and the upper end portion of the fixing member 23 is fixed to the lifting prevention pressing member 25.

After that, as shown in FIG. 8E, the enlarged diameter portion 28a is filled with a backfill material 28b such as sand or slag, and the installation is completed. It is desirable that the width dimension of the lifting prevention holding member 25 to be used is equal to or larger than the diameter width of the guide pipe 29 so that no gap is formed on the upper surface of the guide pipe 29.

Then, as shown in FIG. 9, in this state, concrete is cast between the buried formwork 24, 24 to form the main beam portions 5, 5 ..., And the cast main beam portions 5, 5 ... Concrete is cast on the buried form 24 to form the upper deck portion 7.

When the concrete is cast, the lightweight buried formwork members 22, 22 ... Are in a state of being pressed against the lower deck portion 20 side by the lifting prevention pressing member 25 and the fixing member 23, and the concrete lifts and lifts. Lateral displacement is prevented, and the main beam portions 5, 5 ... And the upper floor slab portion 7 are formed in a predetermined shape.

Further, since each of the uppermost lightweight buried formwork members 22 is provided with a chamfering inclined portion 22a at the upper edge portion, the cross-sectional triangle is formed at the connecting portion between the main beam portions 5, 5 ... And the upper floor slab portion 7. The shaped haunch 5a can be easily formed. Reference numeral 27 in the drawing is an oblique streak embedded in the haunch 5a.

Then, the concrete is cured and solidified, and the concrete structure 4 in a state where the lightweight buried formwork members 22, 22 ... And the fixing member 23 are embedded inside is constructed, and finally the support work is removed to complete the work. ..

In the method for constructing the pile support structure configured in this way, since the buried formwork 24 composed of the lightweight buried formwork members 22, 22 ... Is left in the concrete structure 4, the work of removing the formwork is omitted. It is possible to work efficiently.

Further, since the lower surface of the concrete structure 4 to be constructed is closed by the lower deck portion 20, the joint portion between the pile columnar bodies 3, 3 ... And the concrete (spray zone in the conventional structure) is on the water surface. Since it is not exposed, it prevents corrosion of the reinforcing bars arranged at the joint portion between the pile columnar bodies 3, 3 ... And the concrete, the lower surface of the lower deck portion 20, and the side surface side of the main beam portion 5, and has high durability. Can be obtained.

Furthermore, in this method of constructing the pile support structure, the workability of the lightweight buried formwork members 22, 22 ... Is excellent, so that the workability at the construction site is good, and the lightweight buried formwork members 22, 22 ... Are arranged. And, by combining the shapes, it is possible to obtain a high degree of design freedom regarding the shape of the beam structure 6, that is, the cross section (thickness) of the main beam portion 5 and the upper deck portion 7, and flexibly respond to design changes. It is possible to cope with cases where there is a difference in the loading load acting on the upper floor slab portion 7 depending on the location.

For example, as shown in FIG. 10, the buried form 24 may be formed only by stacking the lightweight buried form members 22, 22 ... Formed in a fixed block shape, and arranged between the main beam portions 5, 5. The buried formwork 24 may be arranged at intervals from each other, and concrete may be cast between the buried formwork 24 to form an auxiliary beam between the main beams.

Further, as shown in FIGS. 11 and 12, an integral buried formwork 24 is formed by arranging the adjacent lightweight buried formwork members 22 and 22 stacked on the upper part so as to be in contact with each other, and then on the upper part. A part of the joint portion of the stacked adjacent lightweight buried formwork members 22 and 22 is cut off to form a groove between the lightweight buried formwork members 22 and 22, and formed between the adjacent lightweight buried formwork members 22 and 22. Concrete may be cast in the groove to form an auxiliary beam 30 having a height different from that of the main beam portion 5. It should be noted that the lightweight buried formwork members 22, 22 which have been partially cut out so that the auxiliary beam 30 can be provided from the beginning may be stacked to form a groove for forming the auxiliary beam 30.

Further, as shown in FIG. 13, the inclined walls 31 and 31 inclined outward and downward may be formed on the side surface portion of the buried form 24, and the main beam portion 5 may be formed in a trapezoidal cross section, as shown in FIG. In addition, the side surface portion of the embedded form 24 may be formed on the projecting portions 32, 32 having a mountain-shaped cross section protruding outward, and the tapered portions 33, 33 may be formed on the side surface portion of the main beam portion 5.

Further, as shown in FIG. 15, one or a plurality of block-shaped lightweight buried formwork members 22 and 22 are stacked between the buried formwork 24 to install a main beam buried formwork 34 having a desired height, and the formwork is buried. Concrete may be cast between the formwork 24 and the buried formwork 34 for the main beam to form a pair of main beam portions 35, 35 parallel to each other.

Further, since the lightweight buried formwork member 22 can be freely processed, it can also correspond to a circular or arcuate beam as shown in FIG.

In the above-described embodiment, the upper surface of the buried form 24 is provided with a diameter-expanded portion 28a having an enlarged diameter at the upper edge of the insertion hole 28 penetrating the buried form 24, and the diameter-expanded portion 28a rises to the bottom. By placing the prevention holding member 25 and fixing the upper end portion of the fixing member 23 passed through the insertion hole 28 to the lifting prevention holding member 25, the embedded form 24 is pressed against the lower deck portion 20. However, the mode of fixing the buried form 24 is not limited to this, and for example, the lifting prevention pressing member 25 similar to the above-described embodiment is inserted into the insertion hole 28 without providing the enlarged diameter portion 28a. It may be placed on the upper end edge, that is, on the upper surface of the embedded form 24.

Further, as in the examples shown in FIGS. 17 to 19, long plate-shaped lifting prevention holding members 47, 47 ... made of angle steel, channel steel, steel plate, etc. are placed on the upper surfaces of the embedded formwork 24, 24. It may be placed. The same reference numerals are given to the same configurations as those in the above-described embodiment, and the description thereof will be omitted.

In this embodiment, the lightweight buried formwork members 22, 22 ... Are stacked, and when the installation of the buried formwork 24 is completed, the long plate-shaped lifting prevention holding members 47, 47 are placed on the adjacent buried formwork 24, 24. ... Is bridged and placed, one end of the rod-shaped fixing member 23 is connected to the lifting prevention holding member 47, and the other end is connected to the anchor member 21 embedded in the lower floor slab portion 20 for lightweight embedding. The buried form 24 formed by stacking the form members 22, 22 ... Is pressed down.

Through holes 47a are formed at predetermined positions in the longitudinal direction of the lifting prevention pressing members 47, 47 .... As shown in FIG. 18, a rod-shaped fixing member 23 is passed through the through holes 47a, and the lower end is lowered. It is connected to the anchor member 21 embedded in the side deck portion 20, and the upper end is connected to the lifting prevention holding member 47.

The fixing member 23 is formed in a rod shape and has screw portions at the top and bottom. The screw portion at the lower end can be screwed into the anchor member 21, and the fixing nut 26 is screwed into the screw portion at the upper end to lift the fixing member 23. It can be fixed to the preventive holding members 47, 47 ...

When the long plate-shaped pressing members 47, 47 ... For preventing lifting are used, as shown in FIG. 18, the fixing member 23 can be installed between the adjacent buried formwork 24, 24. By using it together with the fixing member 23 through the insertion hole 28, the embedded form 24 can be pressed more stably.

Reference numeral 48 in the drawing is a shear reinforcing bar for auxiliary beams installed between adjacent buried formwork 24, 24, and the lower end of the lower floor slab main bar 15 is buried in the lower deck portion 20. The upper end is connected to the upper floor slab main bar 17 arranged on the lifting prevention holding member 47. The lower beam main bar 15 and the upper beam main bar 17 are different from the other lower deck main bars 13 and the upper deck main bar 16 arranged at the same level according to the required strength of the auxiliary beam. The diameter may be changed to that of the reinforcing bar, or the lower auxiliary beam main bar and the upper auxiliary beam main bar may be arranged in two stages in the same manner as the main beam portions 5, 5 ....

Then, as shown in FIG. 19, in this state, concrete is cast between the buried formwork 24, 24 to form the main beam portions 5, 5 ... And the auxiliary beam portion 30, and the cast main beam portion is formed. 5, 5 ..., Concrete is cast on the auxiliary beam portion 24 and the buried formwork 24, 24 to form the upper deck portion 7.

When the concrete is cast, the lightweight buried formwork members 22, 22 ... Constituting the buried formwork 24 are pressed against the lower deck portion 20 side by the lifting prevention pressing member 47 fixed by the fixing member 23. In this state, the concrete is prevented from being lifted and displaced, and the main beam portions 5, 5 ..., the auxiliary beam portion 30, and the upper floor slab portion 7 are formed in a predetermined shape.

In the above-described embodiment, the case where the concrete structure 4 supported by the pile columnar bodies 3, 3 ... Is constructed by on-site construction has been described, but the method of the present invention describes the pile columnar body as shown in FIG. It can also be applied to the production of the precast concrete structure 40 supported by 3, 3 ... The same components as those in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted.

In this embodiment, a flat formwork leveling concrete 42 installed on the ground 41 that also serves as a support is used as the lower formwork member, and the lower floor slab is previously placed on the formwork leveling concrete 42. After constructing the precast concrete structure 40 provided with the portion 20 and the beam structure 6, the precast concrete structure 40 is supported by the pile column bodies 3, 3 ...

As shown in FIG. 20A, the formwork-combined leveling concrete 42 is formed into a floor slab having a flat upper surface by placing concrete on a base 43 made of crushed stone or the like constructed on a flat ground 41. It is formed, and a structure in which the lower form member and the support supporting the lower formwork member are integrated is formed.

Further, although not particularly shown, an outer formwork plate that covers the outside of the entire area where the precast concrete structure 40 is constructed is installed so as to surround the side surface of the entire area where the concrete structure 4 is constructed.

Then, as shown in FIG. 20B, a plurality of rod-shaped lower floor slab main bars 13, 13 ... Are arranged on the formwork-combined leveling concrete 42 at intervals in the horizontal direction, and the main beam portion is formed. A main bar group 14 composed of a plurality of main bars directed in the longitudinal direction of the beam is formed according to the positions where the auxiliary beam portions 45 are formed.

Further, as shown in FIG. 21, a cylindrical formwork member for forming a vertically penetrating hole to which the pile columnar bodies 3, 3 ... Are joined is formed at a portion where the main beam portions 5, 5 ... Alternatively, a sheath tube 44 is arranged.

After the reinforcement is completed, the edge cutting sheet 49 is laid on the formwork leveling concrete 42 so that the concrete forming the lower floor slab 20 does not adhere to the formwork leveling concrete 42, and then the concrete is placed. It is cast to form a flat plate-shaped lower deck portion 20 having a certain thickness.

In the lower floor slab portion 20, the lower floor slab main bars 13, 13 ... Are embedded, and the upper lower beam main bars 15, 15 ... Are exposed on the lower floor slab 20. The lower end portions of the shear reinforcing bars 19, 19 ... Are also embedded in the lower deck portion 20.

An anchor member 21 is embedded in each lower deck portion 20 in a state where the connecting portion at the upper end protrudes from the upper surface at a predetermined position.

Then, after curing the concrete constituting the lower floor slab portion 20 for a certain period of time, as shown in FIG. 20 (c), the concrete is surrounded by a predetermined portion on the lower floor slab portion 20, that is, the main muscle group 14. The block-shaped lightweight buried formwork members 22, 22 ... Are piled up in the space to form the buried formwork 24 having a desired shape for forming the main beam portions 5, 5 ....

Further, the lightweight buried formwork members 22, 22 ... Adjacent to each other in a predetermined direction are spaced apart from each other with the reinforcing bar group 14 for the auxiliary beam 45 sandwiched in the space surrounded by the main bar group 14 on the lower deck portion 20. To form a gap for forming the auxiliary beam portion 45 between the two lightweight buried form 24 members. When it is not necessary to form the auxiliary beam portion 45, it can be dealt with by adjusting the manufacturing dimensions of the lightweight buried formwork member 22 installed in the space surrounded by the main bar group 14. Further, the auxiliary beam 45 does not have to have a depth up to the upper part of the lower floor slab portion 20, and may have a predetermined depth set by adjusting the manufacturing dimensions of the lightweight buried formwork member 22.

Then, when the installation of the lightweight buried formwork members 22, 22 ... Is completed, the lifting prevention pressing member 25 supported by the guide pipe is supported, and one end of the rod-shaped fixing member 23 is connected to the lifting prevention pressing member 25. At the same time, the other end is connected to the anchor member 21 embedded in the lower deck portion 20, and the lightweight embedded formwork members 22, 22 ... Are fixed.

Then, in this state, concrete is cast between the lightweight buried formwork members 22, 22 ... To form the main beam portions 5, 5 ... And the auxiliary beam portions 45, and the cast main beam portions 5, 5 ... , Auxiliary beam portion 45 and lightweight buried formwork members 22, 22 ... Concrete is cast on the auxiliary beam portion 45 to form the upper floor slab portion 7.

When the concrete is cast, the lightweight buried formwork members 22, 22 ... Are in a state of being pressed against the lower deck portion 20 side by the lifting prevention pressing member 25 fixed by the fixing member 23, and the concrete. Since the floating and the displacement due to the above-mentioned are prevented, the main beam portions 5, 5 ..., the auxiliary beam portion 45, and the upper deck portion 7 are formed in a predetermined shape. As an auxiliary fixing method between the stacked lightweight formwork members 22, the lightweight formwork members 22 may be fixed by using an adhesive or an adhesive tape.

Then, the concrete is cured and solidified, and the precast concrete structure 40 in a state where the lightweight buried formwork members 22, 22 ..., the lifting prevention holding member 25 and the fixing member 23 are embedded in the concrete structure 4 is constructed. ..

As shown in FIG. 20D, the constructed precast concrete structure 40 is lifted by a crane or the like and joined to the heads of the pile columnar bodies 3, 3 ... Reference numeral 46 in the drawing is a lifting wire.

Further, in the above-described embodiment, the case where the lightweight buried formwork members 22, 22 ... Are made of foamed resin has been described, but the materials of the lightweight buried formwork members 22, 22 ... Are not limited to this, and are lightweight and lightweight. Any material having sufficient strength may be used, and for example, a corrugated cardboard material may be used for formation.

1 Pile support structure 2 Underwater ground 3 Pile columnar body 4 Concrete structure 5 Main beam part 6 Beam structure 7 Upper floor slab part 8 Support tool 9 Support girder material 10 Support beam material 11 Root 12 Lower type Frame member 13 Lower floor slab main reinforcement 14 Main reinforcement group 15 Lower beam main reinforcement 16 Upper floor slab main reinforcement 17 Upper beam main reinforcement 18 Beam side reinforcement 19 Shear reinforcement 20 Lower floor slab 21 Anchor member 22 Lightweight embedded type Frame member 23 Fixing member 24 Embedded mold 25 Lifting prevention holding member 26 Fixing nut 27 Oblique bar 28 Insertion hole 29 Guide pipe 30 Auxiliary beam 31 Inclined wall 32 Protruding part 33 Tapered part 34 Embedded mold for main beam 35 Main beam 40 Precast concrete structure 41 Above ground 42 Flattened concrete for both form frame 43 Base 44 Sheath pipe 45 Auxiliary beam 46 Wire 47 Lifting prevention holding member 48 Auxiliary tension shear reinforcing reinforcing bar 49 Edge cutting sheet

Claims (15)

In a method for constructing a pile support structure including a beam structure formed by a main beam portion supported by a pile columnar body and an upper deck portion supported on the beam structure.
After placing concrete on the lower formwork member laid on the support to form the lower deck part,
One or more block-shaped lightweight buried formwork members are installed side by side in the vertical and / or horizontal directions at a predetermined position on the lower deck portion to form an embedded formwork having a desired shape.
One end of the rod-shaped fixing member is connected to the anchor member embedded in the lower deck portion, and the other end is fixed to the lifting prevention holding member arranged on the upper surface portion of the embedded formwork.
In that state, concrete is cast between the buried formwork to form the main beam portion, and concrete is cast on the main beam portion and the buried formwork to form the upper deck portion. A method of constructing a pile support structure characterized by. The method for constructing a pile support structure according to claim 1, wherein an insertion hole penetrating the buried formwork is provided, and one end of the fixing member is connected to an anchor member embedded in the lower deck portion through the insertion hole. .. The method for constructing a pile support structure according to claim 1 or 2, wherein the lift-preventing holding member is formed in a long plate shape and is placed over the upper surfaces of a plurality of the embedded formwork. The pile according to claim 2, wherein a diameter-expanded portion having an enlarged diameter of the upper edge portion of the insertion hole is formed on the upper surface portion of the embedded form, and the lifting-preventing pressing member is placed on the bottom portion of the diameter-expanded portion. How to build a support structure. The method for constructing a pile support structure according to any one of claims 2 to 4, wherein a guide pipe is fitted inside the insertion hole, and the lifting member is supported on the upper end surface of the guide pipe. The invention according to any one of claims 1 to 5, wherein a gap is provided between the buried formwork arranged between the main beam portions, and concrete is poured into the gap to form an auxiliary beam between the main beam portions. How to build a pile support structure. The buried formwork is stacked on top of each other, and adjacent lightweight buried formwork members of different heights are arranged at intervals from each other, and concrete is placed between the adjacent lightweight buried formwork members of different heights. The method for constructing a pile support structure according to any one of claims 1 to 5, wherein an auxiliary beam having a height different from that of the main beam portion is formed. Construction of the pile support structure according to any one of claims 1 to 7, wherein a part of the lightweight buried formwork members to be stacked is formed low, and stepped portions having different heights are formed on the upper surface portion of the buried formwork. Method. The method for constructing a pile support structure according to any one of claims 1 to 8, wherein an inclined portion inclined outward and downward is formed on the upper edge portion of the buried form. The method for constructing a pile support structure according to any one of claims 1 to 9, wherein an inclined wall inclined outward and downward is formed on a side surface portion of the buried form. The method for constructing a pile support structure according to any one of claims 1 to 10, wherein the side surface portion of the buried form is formed into a mountain shape having a cross section protruding outward. One or a plurality of block-shaped lightweight buried formwork members are stacked between the buried formwork to install a main beam buried formwork having a desired height, and between the buried formwork and the main beam formwork. The method for constructing a pile support structure according to any one of claims 1 to 11, wherein concrete is poured into the formwork to form a pair of main beam portions parallel to each other. The method for constructing a pile support structure according to any one of claims 1 to 12, wherein the support is a support work supported by the pile column. The lower formwork member is a flat formwork-combined concrete installed on the ground that also serves as the support, and the lower formwork portion and the beam are previously placed on the formwork-combined concrete. The method for constructing a pile support structure according to any one of claims 1 to 12, wherein after constructing the precast concrete structure provided with the structure, the precast concrete structure is supported by the pile columnar body. The method for constructing a pile support structure according to any one of claims 1 to 14, wherein the lightweight buried formwork member is formed in a block shape by foamed resin.

Images