JP2006274587A - Construction method of connection structure of pile and footing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method of a connecting structure of a pile and a footing allowing a connecting member to be accurately disposed in a predetermined position. <P>SOLUTION: Hanging members 5 and a support member 6 are disposed to position the connecting member 4 for connecting the footing 3 and a pile head 2A, in such an arranged state that the upper end is arranged in the footing 3 and that the lower end is arranged in the pile head 2A. In the state of the connecting member 4 being positioned using the hanging members 5 and the support member 6, inside filling concrete 21 of the pile head 2A and concrete which forms the footing 3, are placed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a construction method for a combined structure of a pile and a footing that couples a footing and a pile head via one or more coupling members.

As an example of a coupling structure of this type of pile and footing, as shown in FIG. 8, a footing 3 and a pile head 2 </ b> A installed below the footing 3 and filled with the filling concrete 21 are Or what was couple | bonded via the 2 or more coupling member 4 is known (for example, refer patent document 1).
Note that reference numeral 2a in FIG. 8 is a detent portion formed on the inner peripheral surface of the pile 2, 4a is a detent portion formed on the outer peripheral surface of the coupling member 4, and 8 is a footing between the pile 2 and the footing. 3 is a cutting edge material for cutting the connection to the bending moment with 3, 13 is abandoned concrete placed on the ground 1, and 21 </ b> A is when filling the piled concrete 21 into the pile head 2 </ b> A. Reference numeral 41 denotes a bottom plate to be installed, and reference numeral 41 denotes filling concrete filled in the connecting member 4.
JP 2001-159142 A

In such a combined structure of the pile and the footing, in order to ensure the supporting force, toughness, and rigidity, the connecting member 4 for connecting the footing 3 and the pile head 2A is accurately arranged at a predetermined position. There is a need.
However, in the above-described Patent Document 1, there is no disclosure about a method of arranging the coupling member 4 at a predetermined position.
Then, this invention makes it a subject to provide the construction method of the joining structure of the pile and footing which can arrange | position the coupling member which couple | bonds a footing and a pile head accurately in a predetermined position.

  In order to solve such a problem, the construction method of the combined structure of a pile and a footing according to the present invention includes a footing and a pile head installed under the footing and filled with a filler. A method for constructing a coupling structure of a pile and a footing that is coupled via one or more coupling members oriented in the vertical direction, wherein the coupling member is arranged with an upper end portion in the footing and a lower end portion Concrete comprising positioning means for positioning in the arrangement state arranged in the pile head, and using the positioning means, the concrete that forms the footing with the filler in a state where the coupling member is positioned in the arrangement state And is placed.

Moreover, in the construction method of the combined structure of the pile and the footing according to the present invention, as the positioning means, one or two or more extending from the temporary beam arranged above the pile head toward the inside of the pile head The suspension member may be disposed, and the coupling member may be supported by the suspension member to position the coupling member in the arrangement state.
Here, as the positioning means, it is preferable that a support member for positioning a horizontal position of the coupling member at a predetermined position is further provided after the coupling member is supported by the suspension member.

Furthermore, in the construction method of the combined structure of the pile and footing according to the present invention, as the positioning means, the upper end surface of the pile head extending in the horizontal direction from the outer peripheral surface to the outer peripheral surface of the connecting member in advance. And one or two or more fixing members provided with a latching portion that is latched on the inner peripheral surface of the pile head and projecting the fixing member on the upper end surface of the pile head You may make it position the said coupling member in the said arrangement | positioning state by mounting and supporting the said coupling member.
Furthermore, in the construction method of the combined structure of the pile and the footing according to the present invention, it is preferable to fill the filler while vibrating the connecting member.

  According to the present invention, since the coupling member is positioned at the time of placing the filler or the concrete that forms the footing, the coupling member can be accurately arranged at a predetermined position. Therefore, it is possible to construct a pile-footing connection structure having excellent support force, toughness, and rigidity.

Next, embodiments of the present invention will be described with reference to the drawings.
<First embodiment>
Drawing 1 is a sectional view showing the construction method of the combined structure of the pile and footing concerning a first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line AA in FIG. In addition, about the structure similar to the past, it attaches | subjects and demonstrates the same code | symbol.
In the construction method of the combined structure of the pile and the footing according to the first embodiment, as shown in FIGS. 1 and 2, as the positioning means, a plurality (two in the present embodiment) of the suspension members 5 and a plurality (the present) In the embodiment, four support members 6 are prepared.
The suspension member 5 is made of a deformed reinforcing bar, and is fixed in advance to the mutually opposed positions on the inner peripheral surface of the coupling member 4 made of a steel pipe in a state where the suspension member 5 penetrates the inner peripheral side.

The support member 6 includes a rectangular steel plate 61 and a latching portion 62 that is formed on the lower surface of one longitudinal end of the steel plate 61 and protrudes downward. The longitudinal dimension of the steel plate 61 is at least half the length obtained by subtracting the outer diameter of the coupling member 4 from the outer diameter of the pile 2 made of a steel pipe. Moreover, the latching part 62 is provided in the position which can contact the internal peripheral surface of the pile 2. FIG.
The construction method of the combined structure of the pile 2 and the footing 3 in the first embodiment first embeds the pile 2 in the ground 1 until the outer peripheral surface of the pile head 2A is substantially hidden using a known method. Next, the temporary beam 7 is disposed above the region where the footing 3 is to be formed.

Next, the coupling member 4 to which the suspension member 5 is fixed is inserted into the pile head 2A with the shaft directed in the vertical direction, and the upper end portion of the coupling member 4 of the footing 3 above the pile head 2A is inserted. The connecting member 4 is suspended by fixing the upper ends of the suspension members 5 to the temporary beams 7 in a state in which the lower ends thereof are arranged in the planned formation region and aligned with the lower ends of the pile heads 2A. State.
Thereby, the coupling member 4 is positioned in the up-down direction with respect to the pile head 2A. In addition, the lower end part of the suspension material 5 is connected with the bottom plate 21A arrange | positioned in 2 A of pile heads. Fig.1 (a) is sectional drawing which shows the state so far.

Next, in a state in which the coupling member 4 is positioned so as to be concentric with the pile 2, the support member 6 is opposed to the upper end surface of the pile head 2 </ b> A via an edge cutting material 8 made of a rubber material. Arrange as follows. At this time, one end surface in the longitudinal direction of the steel plate 61 constituting the support member 6 is brought into contact with the outer peripheral surface of the coupling member 4 via the edge cutting material 8 made of a rubber material, and the latching portion 62 provided on the support member 6 is It abuts on the inner peripheral surface of the pile 2. Moreover, the edge cutting material 8 which consists of rubber materials is arrange | positioned between the lower surface of the longitudinal direction other end part of the steel plate 61 which makes the supporting member 6, and the upper end surface of 2 A of pile heads.
Thereby, since the distance between the outer peripheral surface of the coupling member 4 and the inner peripheral surface of the pile head 2A is regulated, the coupling member 4 is positioned in the horizontal direction with respect to the pile head 2A.

Next, the formwork vibrator 9 is installed on the outer peripheral surface of the upper end portion of the coupling member 4. Next, a formwork (not shown) and a reinforcing bar (not shown) for the footing 3 are arranged using a known method.
Next, the pipe P is inserted into the coupling member 4 from the upper end side. First, while the filling member 4 is vibrated by the form vibrator 9 until the filling concrete (filler) 21 is embedded in the pile head 2A, Place concrete. Thereby, in the pile head 2A, the concrete wraps around between the outer peripheral surface of the coupling member 4 and the inner peripheral surface of the pile 2, and the inside-filled concrete 21 can be placed in the pile head 2A without any gap. . FIG.1 (b) is sectional drawing which shows the state so far.

Next, after the filling concrete 21 of the pile head 2A is placed, the form vibrator 9 is removed, and the filling concrete 41 is placed in the coupling member 4, and the top surface of the pile head 2A. Then, the concrete forming the footing 3 is placed on the upper surface of the ground 1.
Then, after the footing 3 is formed, the temporary beam 7 and the formwork for the footing 3 are removed, whereby the construction of the combined structure of the pile 2 and the footing 3 is completed. Here, the suspension member 5 and the support member 6 used as the positioning means of the coupling member 4 are left buried because they do not affect the coupling performance between the pile 2 and the footing 3.

That is, as shown in FIG. 1C, the coupling structure between the pile 2 and the footing 3 obtained by the construction method of the present embodiment is that the footing 3 and the pile head 2 </ b> A are the suspension member 5 and the support member 6. It is coupled via a supported coupling member 4.
In this embodiment, the concrete that forms the footing 3 is placed on the upper surface of the pile head 2 </ b> A and the upper surface of the ground 1, but between the upper end surface of the pile head 2 </ b> A and the steel plate 61 that forms the support member 6. Since the edge cutting member 8 is arranged, the connection to the bending moment can be cut between the pile head 2A and the footing 3.

Next, functions and effects of this embodiment will be described.
In this embodiment, the connecting member 4 is vertically aligned with respect to the pile head 2A by the suspension member 5, and is also positioned in the horizontal direction with respect to the pile head 2A by the support member 6 in the concrete direction. , The connecting member 4 can be accurately arranged at a predetermined position without shifting the position of the connecting member 4 when placing concrete. Therefore, the supporting force, toughness, and rigidity of the coupling structure of the pile 2 and the footing 3 in which the footing 3 and the pile head 2A are coupled via the coupling member 4 can be improved.

In the first embodiment, two deformed reinforcing bars are used as the suspension member 5 that constitutes the alignment means. However, the present invention is not limited to this, and for example, a rod member other than the deformed reinforcing bar or a wire such as a wire is used as the suspension member 5. It may be used, or the number of the suspension members 5 may be one or three or more.
In the first embodiment, the upper end portion of the suspension member 5 is fixed to the temporary beam 7. However, for example, when the weight of the coupling member 4 is small, the upper end portion of the suspension member 5 is fixed to the reinforcing bar for the footing 3. May be.

Furthermore, in 1st embodiment, although the supporting member 6 which makes an alignment means was arrange | positioned in the upper end part of 2 A of pile heads, it is not restricted to this, For example, the outer peripheral surface of the coupling member 4, and a pile You may make it arrange | position between 2 A of inner peripheral surfaces of the head 2A, and may arrange | position using the reinforcement for footing 3.
Furthermore, in the first embodiment, the rectangular steel plate 61 is used as the support member 6 that constitutes the alignment means. However, the present invention is not limited to this, and the support member 6 may be made of metal or wood other than steel, and may be supported. It is good also considering the shape of the member 6 as the ring shape which covers the upper end surface of the pile 2 opened to the outer peripheral side of the coupling member 4. FIG.

For example, as shown in FIG. 3, the support member 6 includes a plurality of rectangular steel plates 61A (four in this embodiment) whose longitudinal dimensions are longer than the outer diameter of the coupling member 4, and the longitudinal length of the steel plate 61A. You may comprise from 62 A of latching parts formed in the lower surface of a direction both ends so that it may protrude below and in the position which can contact the internal peripheral surface of the pile 2. FIG.
In this case, these steel plates 61A are disposed in a state where they are placed in a cross-beam shape on the upper end surface of the pile head 2A, and the latching portions 62A formed on the lower surface of each steel plate 61A are applied to the inner peripheral surface of the pile 2. In addition, the edge cutting member 8 is disposed between the outer peripheral surface of the coupling member 4 and the side surface of the steel plate 61A.

Furthermore, in 1st embodiment, although the edge cutting material 8 arrange | positioned in the upper end surface of the pile head 2A was provided only in the location which contact | connects the steel plate 61 which makes the supporting member 6, it is not restricted to this, For example, pile head 2A You may provide so that all the upper end surfaces of may be covered.
Furthermore, in the first embodiment, the suspension member 5 and the support member 6 are used as the alignment unit. However, the present invention is not limited thereto, and only the suspension member 5 may be used as the alignment unit.
Furthermore, in 1st embodiment, although the lower end part of the suspension material 5 was connected with the baseplate 21A arrange | positioned in the pile head 2A, it is not necessary to connect.

<Second embodiment>
FIG. 4 is a cross-sectional view showing a construction method of a combined structure of a pile and a footing according to the second embodiment of the present invention. FIG. 5 is a cross-sectional view taken along line BB in FIG. In addition, about the structure similar to the past, it attaches | subjects and demonstrates the same code | symbol.
In the construction method of the combined structure of the pile 2 and the footing 3 in the second embodiment, as shown in FIGS. 4 and 5, a plurality (four in this embodiment) of fixing members 10 are prepared as positioning means.

  As with the support member 6 used in the first embodiment described above, the fixing member 10 is a rectangular steel plate 11 and a latching portion 12 that is formed on the lower surface of one longitudinal end portion of the steel plate 11 and protrudes downward. And consist of The longitudinal dimension of the steel plate 11 is at least half the length of the outer diameter of the pile 2 made of steel pipe minus the outer diameter of the coupling member 4. Moreover, the latching | locking part 12 is provided in the position which can contact the internal peripheral surface of the pile 2. FIG.

  Then, when the coupling member 4 is disposed in the pile head 2A with the axis directed in the vertical direction, its upper end is disposed above the pile head 2A, and its lower end is disposed in the pile head 2A. In addition, one end surface in the longitudinal direction of each steel plate 11 constituting the fixing member 10 is previously opposed to the outer peripheral surface in the vicinity of the center portion in the axial direction of the coupling member 4 so that the axial core is concentric with the pile 2. It was made to project by welding.

  In the construction method of the coupling structure of the pile 2 and the footing 3 in the second embodiment, first, the pile 2 is embedded in the ground 1 until the outer peripheral surface of the pile head 2A is substantially hidden, as in the first embodiment described above. . Next, in a state where the coupling member 4 is inserted into the pile head 2A, the fixing member 10 protruding from the outer peripheral surface of the coupling member 4 is placed on the upper end surface of the pile head 2A. At this time, the lower surface of the front end portion in the longitudinal direction of the steel plate 11 constituting the fixing member 10 is placed on the upper end surface of the pile head portion 2A via the rubber material 8, and the latching portion 12 contacts the inner peripheral surface of the pile 2. Touched. FIG. 4A is a cross-sectional view showing the state so far.

  Next, a mold vibrator 9 is installed on the outer peripheral surface of the upper end portion of the coupling member 4. Next, after placing a formwork (not shown) and a reinforcing bar (not shown) for the footing 3 in the same procedure as the first embodiment described above, concrete is placed from the upper end side of the coupling member 4. . At this time, for the same reason as in the first embodiment, the concrete is placed while vibrating the coupling member 4 with the form vibrator 9 until the filling concrete 21 is embedded in the pile head 2A. FIG. 4B is a cross-sectional view showing the state so far.

Next, in the same procedure as in the first embodiment, embedded concrete 21, 41 is embedded in the pile head 2 </ b> A and the coupling member 4, and the footing 3 is attached to the upper surface of the pile head 2 </ b> A and the upper surface of the ground 1. Placing the eggplant concrete, the construction of the combined structure of the pile 2 and the footing 3 is completed. Here, the fixing member 10 used as the positioning means of the connecting member 4 is left buried because it does not affect the connecting performance between the pile 2 and the footing 3.
That is, the coupling structure of the pile 2 and the footing 3 obtained by the construction method of the present embodiment is a coupling in which the footing 3 and the pile head 2A are supported by the fixing member 10 as shown in FIG. It is connected via the member 4.

Next, functions and effects of this embodiment will be described.
In the present embodiment, by placing the concrete in a state where the coupling member 4 is aligned in the vertical direction and the horizontal direction by the fixing member 10, the position of the coupling member 4 is not shifted when the concrete is placed. Therefore, the coupling member 4 can be arranged with high accuracy. Therefore, the supporting force, toughness, and rigidity of the coupling structure of the pile 2 and the footing 3 in which the footing 3 and the pile head 2A are coupled via the coupling member 4 can be improved.

However, in this embodiment, since the connecting member 4 is fixed only by the fixing member 10 protruding from the outer peripheral surface thereof, when the weight of the connecting member 4 is large or the amount of concrete to be placed is large. Is preferably provided with the alignment means shown in the first embodiment.
In addition, in 2nd embodiment, although the rectangular steel plate 11 was used as the fixing member 10 which makes an aligning means, it is not restricted to this, The material of the fixing member 10 is good also as metals and wood other than steel, and fixing. It is good also considering the shape of the member 10 as the ring shape which covers the upper end surface of the pile 2 opened to the outer peripheral side of the coupling member 4. FIG.

For example, as shown in FIG. 6, the fixing member 10 includes a plurality of (in this embodiment, four) steel plates 11 </ b> A having a longer longitudinal dimension than the outer diameter of the coupling member 4, and the length of the steel plate 11 </ b> A. You may comprise from 12 A of latching parts formed in the position which can contact the internal peripheral surface of the pile 2 so that it may protrude below in the lower surface of a direction both ends.
In this case, these steel plates 11A are arranged in a grid pattern so as to be in contact with the outer peripheral surface of the coupling member 4, and the latching portions 12A formed on the lower surface of each steel plate 11A are brought into contact with the inner peripheral surface of the pile 2. At the same time, the contact surfaces of the coupling member 4 and the steel plate 11A are fixed by welding.

Furthermore, in 2nd embodiment, although the edge cutting material 8 arrange | positioned in the upper end surface of the pile head 2A was provided only in the location which contact | connects the steel plate 11 which makes the fixing member 10, it is not restricted to this, For example, pile head 2A You may provide so that all the upper end surfaces of may be covered.
Moreover, although the 1st and 2nd embodiment demonstrated the case where the footing 3 and the pile head 2A were combined via the one coupling member 4, it is not restricted to this, The footing 3 and the pile head 2A May be coupled via two or more coupling members 4.

Furthermore, in the first and second embodiments, the concrete forming the footing 3 is directly placed on the upper surface of the pile head 2A and the upper surface of the ground 1, but not limited thereto, the discarded concrete is disposed on the upper surface of the ground 1. Alternatively, concrete forming the footing 3 may be placed.
In this case, first, after positioning the coupling member 4 by the positioning means, the discarded concrete is placed on the ground 1 on the outer peripheral side of the pile head 2A. Next, after placing the formwork vibrator 9 and the formwork and reinforcing bars for the footing 3 in the same manner as described above, the filling concrete 21 is placed in the pile head 2A while vibrating the coupling member 4 by the formwork vibrator 9. Embed. Next, the filling concrete 41 is embedded in the coupling member 4, and the concrete forming the footing 3 is placed on the upper surface of the pile head 2A and the upper surface of the discarded concrete.

Furthermore, in 1st and 2nd embodiment, although the concrete which makes the footing 3 was directly laid on the upper surface of the pile head 2A, and the upper surface of the ground 1, not only this but the upper surface of the pile head 2A and the footing 3 A gap may be formed between the lower surface of the pile head 2 and the upper surface of the ground 1 on the outer peripheral side of the pile head 2 </ b> A and the lower surface of the footing 3.
In this case, for example, as shown in FIG. 7, first, a recess 1A having a diameter larger than the outer diameter of the pile head 2A is formed in the ground 1, and the outer peripheral surface of the pile head 2A is formed in the recess 1A. The pile 2 is embedded until it is almost hidden. Next, the coupling member 4 is aligned by the fixing member 10 as described above. Next, a mold for forming a gap between the upper surface of the pile head 2A and the lower surface of the footing 3 and between the upper surface of the ground 1 and the lower surface of the footing 3 on the outer peripheral side of the pile head 2A. A frame 51 is arranged. Next, in the same manner as described above, a formwork vibrator 9 and a formwork (not shown) or a reinforcing bar (not shown) for the footing 3 are arranged, and while the coupling member 4 is vibrated by the formwork vibrator 9, the pile head Filled concrete 21 is embedded in the part 2A. Next, the filling concrete 41 is embedded in the connecting member 4, and the concrete forming the footing 3 is placed in the mold 51.

  Furthermore, in 1st and 2nd embodiment, the concrete which makes the footing 3 on the upper surface of the pile head 2A is laid, and between the coupling member 4 and the support member 6, and the upper end surface of the pile head 2A, and support By arranging the edge cutting member 8 between the member 6 or the fixing member 10, the connection to the bending moment is cut between the pile head 2A and the footing 3, but not limited to this, the pile head 2A An edge-cutting material made of a material having a smaller rigidity than the concrete forming the footing 3 may be filled between the upper surface of the footing 3 and the lower surface of the footing 3. In this case, the pile head 2A and the coupling head 4 and the support member 6 and the pile head 2A can be disposed without arranging the edge cutting member 8 between the upper end surface of the pile head 2A and the support member 6 or the fixing member 10. It is possible to disconnect the bending moment from the footing 3.

Furthermore, in 1st and 2nd embodiment, although the edge cutting material 8 was comprised with the rubber material, you may comprise not only this but the edge cutting material 8 with a polystyrene foam or urethane, for example.
Furthermore, in 1st and 2nd embodiment, although concrete was filled similarly to the concrete which makes a footing as a filler filled in the pile head 2A, it is not restricted to this but other fillers are filled. Also good.

It is sectional drawing which shows the construction method of the combined structure of the pile and footing which concern on 1st embodiment of this invention. It is AA sectional drawing of FIG.1 (b). It is sectional drawing which shows the other example of a supporting member. It is sectional drawing which shows the construction method of the combined structure of the pile and footing which concern on 2nd embodiment of this invention. It is BB sectional drawing of FIG.4 (b). It is sectional drawing which shows the other example of a fixing member. It is sectional drawing which shows the other example of the joint structure of the pile and footing which concern on 1st embodiment of this invention. It is sectional drawing which shows an example of the connection structure of a pile and a footing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ground 1A Recess 2 Pile 3 Footing 4 Coupling member 5 Suspension material 6 Support member 7 Temporary beam 8 Edge cutting material 9 Formwork vibrator 10 Fixing member 11, 61, 11A, 61A Concrete 21 Filled concrete (filler)
21A Bottom frame 41 Filled concrete 51 Formwork

Claims (5)

Construction of a combined structure of a foot and a footing that joins a footing and a pile head that is installed below the footing and that is filled with a filler via one or more connecting members with the axis oriented in the vertical direction A way to
Positioning means for positioning the coupling member in an arrangement state in which an upper end portion is disposed in the footing and a lower end portion is disposed in the pile head;
A method for constructing a combined structure of a pile and a footing, wherein the positioning member is used to place the filler and the concrete that forms the footing in a state where the connection member is positioned in the arrangement state. As the positioning means, one or two or more suspension members extending toward the inside of the pile head from a temporary beam disposed above the pile head,
The method for constructing a combined structure of a pile and a footing according to claim 1, wherein the connecting member is positioned in the arrangement state by supporting the connecting member with the suspension member.   The support member for positioning the horizontal position of the coupling member at a predetermined position after the coupling member is supported by the suspension material as the positioning means. Method of connecting structure of stake and footing. As the positioning means, it extends in advance in the horizontal direction from the outer peripheral surface of the coupling member and is placed on the upper end surface of the pile head, and is hooked on the inner peripheral surface of the pile head. One or two or more fixing members provided with a latching portion to project,
The pile and footing according to claim 1, wherein the fixing member is placed on an upper end surface of the pile head and the coupling member is supported to position the coupling member in the arrangement state. Construction method of the combined structure.   The method for constructing a combined structure of a pile and a footing according to any one of claims 1 to 4, wherein when filling the filler, the connecting member is vibrated.

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