JP5984754B2 - Solid foundation method using PC unit and PC unit - Google Patents

Description

  The present invention is an improvement of a solid foundation method using a PC (precast concrete) unit, more specifically, the foundation work of a building can be easily and efficiently advanced, and the PC unit can be carried in and installed easily. The present invention relates to a solid foundation method using a PC unit that can be performed and that is excellent in terms of safety, construction accuracy, and bonding strength during construction, and a PC unit used therefor.

  As is well known, many houses use a solid foundation in which the rising part on which the foundation is placed and the part between the soils are integrated with concrete, but usually when the rising part of the solid foundation is made of concrete, Construction work takes time because it is necessary to form a mold with a control panel and mix concrete. In addition, advanced construction techniques are required to accurately form the formwork.

  Therefore, conventionally, when the rising portion of the solid foundation is formed, a PC unit manufactured in advance in a factory is used so that it is not necessary to form a mold on the entire rising portion. A solid foundation method has also been proposed in which rising portions are formed by arranging them in an arrangement and integrating them with a soil portion (see, for example, Patent Document 1).

  However, if a solid reinforced concrete block is used for the PC unit as in the construction method described in the above-mentioned document 1, the weight of the PC unit becomes very large, and it is difficult to carry it into the construction site or install it at the rising part. It becomes difficult to do it alone. And if a crane vehicle etc. are used for a movement of a PC unit, construction efficiency will deteriorate.

  Therefore, in the past, in order to solve the problem of loading and installation of the PC unit, techniques using a hollow concrete block for the PC unit have also been proposed (see Patent Documents 2 to 4). After the PC unit is installed, concrete is poured into the hollow portion from the upper side of the PC unit to form a rising portion.

  Incidentally, the construction methods described in the above-mentioned documents 2 and 3 are techniques for forming a solid foundation rising portion using a hollow PC unit in a gap generated between solid PC units used in the main, The construction method described in No. 4 is a technique for forming a solid solid rising portion using only a hollow PC unit without using a solid PC unit.

  However, the construction methods described in the above documents 2 to 4 employ a method in which the PC unit is installed at the rising part before placing the concrete in the soil part. Had to move while avoiding the reinforcing bars built in. For this reason, there was a risk that the operator would fall over while stroking the rebar during construction.

  In addition, if the PC unit is installed before placing the concrete in the soil as described above, the PC unit must be installed on the crushed stone laid under the foundation. It was difficult to install horizontally. Therefore, it was necessary to throw the concrete into the rising part and put the PC unit horizontally.

  In addition, with respect to the hollow PC unit described in the above-mentioned document 4, since the concave portions are not formed on both side edges and the lower edge, the PC unit, the bottom concrete, and the PC units are mixed with concrete that has been poured and mixed in the subsequent construction. In the case of joining, the joining area between the post-cast concrete and the PC unit was reduced, and sufficient joining strength was not obtained.

JP 2010-70903 A JP 2003-27497 A JP 2008-175036 A JP 2002-364001 A

  The present invention has been made in view of the above-described problems in the prior art, and the object of the present invention is to facilitate solid foundation construction of buildings easily and efficiently, and to a construction site. It is another object of the present invention to provide a solid foundation method using a PC unit that can easily carry a PC unit into the machine and is excellent in terms of safety, accuracy, and bonding strength during construction, and a PC unit used therefor.

  Means employed by the present inventor for solving the above technical problem will be described with reference to the accompanying drawings.

That is, the present invention is a solid foundation method for integrally constructing the soil part and the rising part with reinforced concrete,
Placing the bottom concrete C ₁ in a state where a reinforcing bar is assembled in the soil part and at least the vertical reinforcing bar R is installed in the rising part; and then the horizontal reinforcing bar R protruding from the rising part is set in the horizontal direction. rebar R 'combine with the step of Crossed rebar in a grid; then, on the punching set by bottom plate concrete C _1, the lower side is open U-shaped cross section PC unit 1, 1 ..., the bottom plate concrete C _{1 in} a state where a gap of a predetermined size is left between the two and the rebar R of the rising portion is covered; and provided on the upper surface of the juxtaposed PC units 1. A fluid post-cast concrete C ₂ is poured from the injection port 11, and is inserted into the hollow portions of the PC unit 1 and the recesses 12 a and 13 a formed on both side edges 12 and 12 and the lower edge 13 of the PC unit 1. Strike Concree It is characterized in employing the method comprising the steps of filling a C _2.

For the PC units 1... Juxtaposed on the bottom concrete C ₁ , the hollow inner walls 14 and 14 are also provided with recesses 14 a and 14 a. It is preferred to use.

Further, in the present invention, after placing the PC units 1... On the bottom concrete C ₁ , the U-shaped template member A is placed at the boundary between the PC units 1 and 1, and the gap between the boundaries is set. covered way blocked, when crowded flowing concrete C ₂ hit back in the PC unit 1, concrete C ₂ struck back from the gap between the PC unit 1, 1 including the concave portion 12a-12a of the side edges 12, 12 It can also be prevented from leaking outside.

In the present invention, after the PC units 1... Are juxtaposed on the bottom concrete C ₁ , rod-like or plate-like base molds M and M are placed on both sides of the PC units 1. arranged so as to close the gap between the bottom plate concrete C ₁ and, when crowded flowing post-deposited concrete in the PC unit 1, the gap between the PC unit 1 and the bottom plate concrete C ₁ including the concave portion 13a of the lower edge portion 13 It is possible to prevent the post-cast concrete C ₂ from leaking out.

In the present invention, when the PC units 1... Are juxtaposed on the bottom concrete C ₁ , the height of the support legs 15, 15. 1 can be made horizontal, and a gap of a predetermined size can be formed between the PC unit 1 and the bottom base concrete C ₁ .

On the other hand, in carrying out the solid foundation method, the PC unit 1 apposition on the bottom plate concrete C ₁ along the rising portion of the mat foundation, form a U-shaped cross section shape lower side opened, and the upper surface is provided with inlet 13 for pouring the concrete C ₂ strike the rear of the fluid-like hollow portion, further bottom freely height adjustment of the support legs 15, 15 ... it is to use those annexed Is preferred. Further, as the PC unit 1, the injection port 11 is formed in a tapered shape whose opening space narrows downward, or on both side edges 12, 12 and the lower edge 13, and a recess 13 a is formed on the decorative surface K. What was formed only in the hollow inner wall 14 side so that an external appearance may not be impaired can also be used conveniently .

  In the present invention, after placing the bottom base concrete with reinforcing bars in the soil part, the hollow PC units are arranged along the rising part, and the solid foundation is constructed by pouring and mixing the post-cast concrete in these PC units. By adopting this method, it is not necessary to form a formwork or the like in the entire rising part, so that the solid foundation work can be facilitated and improved in efficiency.

  In addition, by using a hollow concrete block for the PC unit, the work of loading the PC unit from the truck to the building site and the work of installing the PC unit on the bottom base concrete can be performed manually without using a crane vehicle. Therefore, construction work can be performed more quickly.

  Furthermore, in the present invention, since the post-cast concrete is filled in the concave portions formed on both side edges and the lower edge of the PC unit, the joint area between the post-cast concrete and the PC unit can be increased. Bonding strength can also be improved. In addition, since the anchor effect is also obtained by the concavo-convex portion of the PC unit, the horizontal and vertical shifts of the PC unit with respect to the post-cast concrete can be suppressed.

  On the other hand, in the present invention, since the PC unit can be installed after the bottom base concrete is first placed in the soil part, it is possible to perform the installation work with the feet in a clean state, and the danger of the operator falling over. There is almost no. In addition, by placing the bottom base concrete first, the PC unit can be easily leveled, so that the construction accuracy can be improved.

  Therefore, according to the present invention, not only the construction work and the carry-in work can be performed more easily, but also a sufficient strength as a foundation of a building can be secured, and the safety of the construction work can be improved. Since a solid foundation method using a unit can be provided, the practical value of the present invention is very high.

It is a whole perspective view showing PC unit used in the solid foundation method of Example 1 of the present invention. It is the front view showing the PC unit used in the solid foundation construction method of Example 1 of the present invention, a top view, and both side views. It is a perspective view showing the state which cut | disconnected the PC unit used in the solid foundation construction method of Example 1 of this invention in the center along the longitudinal direction. It is the front view showing the L type PC unit used in the solid foundation construction method of Example 1 of the present invention, a top view, and both side views. It is the front view which wash | cleans the T-type PC unit used in the solid foundation construction method of Example 1 of this invention, a top view, and a both-sides view. It is a state explanatory drawing showing the bottom base concrete placement process of the solid foundation method in Example 1 of the present invention. It is a state explanatory drawing showing the reinforcing bar assembly process of the standup part of the solid foundation method in Example 1 of the present invention. It is a state explanatory drawing showing the PC unit installation process of the solid foundation method in Example 1 of the present invention. It is a state explanatory drawing showing the post-placement concrete placement process of the solid foundation method in Example 1 of the present invention. It is a top view showing the modification of the PC unit used in the solid foundation method of this invention.

“Example 1”
A first embodiment of the present invention will be described with reference to FIGS. In the figure, what is indicated by reference numeral 1 is a PC unit, and what is indicated by reference numeral K is a decorative surface of the PC unit. Moreover, what is indicated by the reference symbol C is bottom concrete and post-cast concrete, and what is indicated by the reference symbol R is a reinforcing bar at a rising portion. Also, what is indicated by the symbol A is a template member, and what is indicated by the symbol M is a base mold.

[About PC unit]
First, the PC unit 1 used in the solid foundation method of the present embodiment will be described. In the first embodiment, the PC unit 1 is composed of a hollow concrete block having a U-shaped cross section with an open bottom (see FIGS. 1 and 2). An injection port 11 having a predetermined size is provided on the upper surface side of the PC unit 1 so as to communicate with the hollow portion.

  The inlet 11 of the PC unit 1 is preferably formed in a taper shape with an opening space narrowing downward. In addition, regarding the shape, number, and size of the inlet 11, one relatively large rectangular inlet 11 is provided in the present embodiment. However, there are a plurality of locations depending on the shape and size of the PC unit 1. It can be changed as appropriate.

  In addition, trapezoidal recesses 12a and 13a are formed at predetermined intervals on both side edges 12 and 12 and the lower edge 13 of the PC unit as shown in FIG. In this embodiment, in order not to impair the appearance of the decorative surface K of the PC unit 1, the concave portions 12a and 13a of the side edge portions 12 and 12 and the lower edge portion 13 are not formed to the outside, and are formed on the hollow inner wall 14 side. Only forming.

  In addition, about the decorative surface K of the PC unit, in this embodiment, thin vertical grooves are provided at predetermined intervals to form a pattern, but other patterns can also be adopted. In this embodiment, the hollow inner walls 14 and 14 of the PC unit 1 are also formed with groove-shaped recesses 14a, 14a... (Filled portions in FIG. 3) at predetermined intervals.

  Furthermore, in this embodiment, support legs 15, 15... Having bolts are attached to nut members embedded in the bottom four corners of the PC unit 1. This makes it possible to adjust the length of the attached support legs 15, 15... To an adjusting bolt type, so that the height of the PC unit 1 can be freely adjusted.

  On the other hand, in the solid foundation method of the present embodiment, not only the linear PC unit 1 in the plan view shown in FIG. 2, but also the PC unit 1 having an L shape in the plan view shown in FIG. A PC unit 1 having a T shape in view and a PC unit 1 (not shown) having a cross shape in plan view are also used. These PC units 1 are all constituted by hollow blocks having a U-shaped cross section.

  As for the inlet 11, the L-type PC unit 1 has an L-type inlet 11, the T-type PC unit 1 has a T-type inlet 11, and the cross-type PC unit 1 has a cross-type. An inlet 11 is formed. The decorative surface K is formed on both side surfaces of the L-type PC unit 1 and is formed on one side surface that is not a bent surface of the T-type PC unit.

  As for the supporting legs 15, 15 ..., the L-shaped PC unit 1 has side edge portions 12 and 12 on both sides and bent portions, and the T-shaped PC unit 1 has three side edge portions 12, 12 ... The cross-shaped PC unit 1 is disposed at the bottom of the four side edges. Further, the side edges 12, the lower edges 13, and the recesses 12 a, 13 a, and 14 a formed in the hollow inner walls 14 and 14 have the same shape as that of the linear PC unit 1.

[About solid foundation method]
Next, a solid foundation method using the PC unit 1 will be described. First, as a first step, the bottom concrete C ₁ is placed in a state where rebars are assembled in a mesh shape on the soil part of the foundation and a vertical rebar R is installed on the rising part of the foundation (see FIG. 6). . At this time, the vertical reinforcing bars R, R... Protrude from the rising portion at a predetermined interval.

Note that the hitting設時of the bottom plate concrete C _1, after implantation of the concrete, dumping or trowel pressing the concrete top surface prior to condensation, finish smoothed the surface with iron. On the other hand, the upper surface of the concrete at the rising portion is preferably roughened by lightly brushing or the like in order to increase the bonding strength.

After that, as a second step, the horizontal reinforcing bars R ′ protruding from the rising portion are connected to the horizontal reinforcing bars R ′ to form the reinforcing bars in a lattice pattern (see FIG. 7). Incidentally, work Crossed rebar rising portion can be conducted in the striking設前bottom plate concrete C _1, better after Da設bottom plate concrete C _1, can feet is working in a clean state .

After that, as a third step, the PC unit 1... _{1 is} placed on the bottom concrete C _1, with a predetermined gap (about 15 mm) between the bottom concrete C ₁ and the rising part. They are juxtaposed so as to cover the reinforcing bars R · R (see FIG. 8). At this time, a gap having a predetermined size (about 30 mm) is also provided between the PC units 1.

At this time, the PC unit 1 is started to be installed from the corner portion of the rising portion, and then the PC unit 1 is installed at the straight portion or the end portion, whereby the installation work can be efficiently performed. Further, the leveling of the PC unit 1 and the adjustment of the gap with the bottom concrete C ₁ are performed by adjusting the length of the support legs 15, 15.

Thereafter, as a fourth step, as shown in FIG. 9, a U-shaped template member A is placed on the boundary between the PC units 1 and 1 so as to close the gap between the PC units 1 and 1. 1 - 1 ... each side of, placing the base formwork M-M of the rod-like or plate-like so as to close the gap between PC unit 1 and the bottom plate concrete C _1.

Note that the base formwork M of the PC unit 1, may be utilized for base mold that was used to pouring the base plate the concrete C _1. In such a case, a control panel having a sufficient vertical width is used for the base formwork. When using a base mold M of the rod-shaped also by nailing temporarily fastened fixed to the bottom plate concrete C _1.

Finally, fluid post-cast concrete C ₂ is poured from the inlet 11 of the PC unit 1, 1..., And the hollow part of the PC unit 1 and the side edges 12, 12 and the lower edge part 13 of the PC unit 1. , hit filled with concrete C ₂ rear hollow interior wall 14, 14 to form recesses 12a, 13a, in 14a, a dirt floor portion and the rising portion by condensing this build together with reinforced concrete.

In addition, by filling the post-cast concrete C ₂ into the recesses 12a, 13a and 14a formed in the side edges 12 and 12 and the lower edge 13 and the hollow inner walls 14 and 14 of the PC unit 1 as described above, it is possible to improve the bonding strength between the concrete C ₂ strikes the rear and PC unit 1. Further, since the anchor effect is obtained by the recesses 12a, 13a, and 14a of the PC unit 1, the earthquake resistance is also improved.

Further, when the post-cast concrete C ₂ is poured into the PC unit 1 and mixed, the PC unit 1. 1 including the recesses 12 a and 12 a of the side edges 12 and 12 is formed by the template member A and the base mold M and M. the gap between, and concrete C ₂ struck back from the gap between the PC unit 1 and the bottom plate concrete C ₁ including the concave portion 13a of the lower edge portion 13 can be prevented from leaking to the outside.

  The present invention is generally configured as described above. However, the present invention is not limited to the embodiments, and various modifications can be made within the description of “Claims”. Regarding the shape, it can be arbitrarily changed according to the shape of the rising portion of the foundation, and shapes other than the linear shape, the L shape, the T shape, and the cross shape can also be adopted in plan view.

As for the injection port 11 of the PC unit 1, as shown in FIGS. 10 (a) to 10 (c), recesses 11 a, 11 a... Are formed on the peripheral wall of the injection port 11 to join the post-cast concrete C _2. Strength can also be increased. In addition, the shape of the recesses 12a, 13a, and 14a formed in the side edge portion 12, the lower edge portion 13, and the hollow inner walls 14 and 14 of the PC unit 1 can be appropriately changed.

  Also, regarding the dimensions of the PC unit 1, it is desirable to design it as small as possible so that the operator can carry it by hand when carrying it to the site or installing it on the site, but if necessary, design it as large as possible. Any of the above is within the technical scope of the present invention.

  In recent years, in the construction field, there has been a demand for the development of a new construction method that can suppress the construction cost and improve the construction efficiency. Under such circumstances, the solid foundation method using the PC unit of the present invention is not only a simple and efficient method for foundation work but also a useful technique that can solve problems such as safety. The industrial utility value is very high.

1 PC unit
11 Inlet
11a recess
12 Side edge
12a recess
13 Lower edge
13a recess
14 Hollow inner wall
14a recess
15 Support legs K Make-up surface C ₁ Bottom concrete C ₂ Post-cast concrete R Reinforcement A Mold plate member M Base formwork

Claims (8)

It is a solid foundation method that builds the soil part and the rising part integrally with reinforced concrete,
A step of placing bottom concrete (C ₁ ) in a state where a reinforcing bar is assembled in the soil part and a vertical reinforcing bar (R) is installed in a rising part; and then a vertical reinforcing bar (R) protruding from the rising part Connecting the horizontal reinforcing bars (R ′) to the steel bars and assembling the reinforcing bars in a grid pattern; and thereafter, a PC unit having a U-shaped cross-section with an opening on the bottom base concrete (C ₁ ). 1) (1) ... are juxtaposed so that the reinforcing bars (R) of the rising part are covered; and the injection port (11) provided on the upper surface of the juxtaposed PC units (1) (1) ... fluid state by pouring post-deposited concrete (C ₂₎ from using PC unit, characterized in that it comprises the step of filling the post out concrete in the hollow portion of the PC unit (1) (C ₂₎ solid Basic construction method. When the PC units (1), (1) ... are placed side by side on the bottom base concrete (C ₁ ), the height of the support legs (15), (15) ... provided at the bottom of the PC unit (1) is adjusted, The PC unit according to claim 1, wherein the PC unit (1) is leveled and a gap of a predetermined size is formed between the PC unit (1) and the bottom concrete (C ₁ ). Solid foundation method. After juxtaposing the PC units (1), (1) ... on the bottom concrete (C ₁ ), stick-shaped or plate-like base molds (M), (M) are placed on both sides of the PC units (1), (1) ... When the post-cast concrete is poured and mixed in the PC unit (1), the recess (13a) in the lower edge (13) is placed so as to close the gap between the PC unit (1) and the bottom base concrete (C ₁ ). 3. A solid using a PC unit according to claim 2, wherein the post-cast concrete (C ₂ ) is prevented from leaking out through a gap between the PC unit (1) including the bottom concrete (C ₁ ). Basic construction method. After juxtaposing the PC units (1), ( ₁ ) on the bottom concrete (C ₁ ), the U-shaped template member (A) is placed at the boundary between the PC units (1), (1). PC unit (1) including the recesses (12a) and (12a) of the side edges (12) and (12) when the post-cast concrete (C ₂ ) is poured and mixed in the PC unit (1). ) (1) solid foundation method using described PC unit in any one of claims 1 to 3 concrete out post from the gap (C ₂₎ is characterized in that to prevent leaking out between. A PC unit (1) juxtaposed on the bottom concrete (C ₁ ) along the rising part of the solid foundation,
The lower side has an open U-shaped cross section, and the upper surface is provided with an injection port (11) for pouring a fluid post-cast concrete (C ₂ ) into the hollow portion. A PC unit characterized in that it is formed in a tapered shape that narrows the space. A PC unit (1) juxtaposed on the bottom concrete (C ₁ ) along the rising part of the solid foundation,
The lower side has an open U-shaped cross section, and the upper surface side is provided with an injection port (11) for pouring fluid-like post-cast concrete (C ₂ ) into the hollow part. (12) The PC unit according to (12), wherein a recess (12a) is formed only on the hollow inner wall (14) side so that the appearance of the decorative surface (K) is not impaired. A PC unit (1) juxtaposed on the bottom concrete (C ₁ ) along the rising part of the solid foundation,
The lower side is formed in a U-shaped cross section, and the upper side is provided with an injection port (11) for pouring fluid post-cast concrete (C ₂ ) into the hollow part, and further the lower edge part (13) The PC unit is characterized in that a recess (13a) is formed only on the hollow inner wall (14) side so that the appearance of the decorative surface (K) is not impaired. The PC unit according to any one of claims 5 to 7, wherein a support leg (15) (15) is adjustable on the bottom .