JP4398876B2 - Structure pier structure - Google Patents

Description

  The present invention relates to a pier structure of a structure that saves labor in construction of a pier foundation, and greatly shortens a construction period and reduces costs in construction work such as a three-dimensional intersection bridge.

  For example, in urban areas, traffic jams occur on a daily basis at road intersections and between railway and road intersections. As a measure to alleviate this congestion, it has been promoted to make three-way intersections on one side of the road. It has been.

  The construction method of the three-dimensional crossing bridge is generally constructed by constructing the footing foundation on the top of the pile foundation, standing the bridge pier on the upper surface of this footing foundation, and building the superstructure. Was supposed to last for a long time. In particular, in the construction of the footing foundation, as shown in FIG. 13 (A), if the excavation is performed using the liner plate 51 after the pile 50 is placed, the pile head processing for removing the pile head is performed. Then, as shown in FIG. 13 (B), leveling treatment (leveling) is performed with non-shrinking mortar and the unevenness of the pile head is eliminated. Then, the anchor frame base 53 is installed, As shown in FIG. 13 (D), the anchor frame 54 is hung down and the position is adjusted as shown in FIG. 13 (C). The foundation concrete 55 was cast using the liner plate 51 as a mold, and then the pier column was installed after the foundation concrete 55 was cured (conventional method).

  However, in the case of the above-mentioned conventional method, it takes a lot of labor and time for the reinforcing bar arrangement work, and the pier construction has to wait for the foundation concrete 55 to be hardened, which causes the construction period to be prolonged. It was.

  Then, in the following patent document 1, the pier main body comprised with the foundation part constructed | assembled by the some steel pipe sheet pile which comprises a support pile, and the some steel pipe pillar which was directly joined to the steel pipe sheet pile of this foundation part. A three-way crossing pier structure having a main girder unit mounted on the upper part of the pier body, that is, a pier structure in which a footing foundation is omitted has been proposed.

  Moreover, in the following Patent Document 2, in order to construct a footing foundation for a steel pier, a substantially box-shaped steel shell for a footing foundation is used, and a three-dimensional intersection constructed so that concrete can be filled after the steel pier is attached. A construction method has been proposed.

Furthermore, in the following Patent Document 3, in the pier connection structure that connects the pile and the pier column, a lower plate attached to the pile head, an upper plate attached on the lower plate, and the opposing surfaces of the lower plate and the upper plate, respectively. A lower load transmission adjusting member and an upper load transmission adjusting member that can adjust the displacement of the pile core and the level of the pile head and can transmit the load. A bridge pier connection structure is disclosed in which the pile core and the pier column are connected via the lower plate and the upper plate by adjusting the displacement and level of the pile core by the adjusting member.
JP 2004-300914 A JP 2004-324340 A JP 2004-278230 A

  In the case of the pier structure described in Patent Document 1, since the structure in which the footing foundation is omitted and the pile head and the pier lower end are directly connected is employed, the work process can be saved by the footing construction work. However, when connecting the steel pipe sheet pile and the upper part of the steel pipe part and the lower end part of the steel pipe column provided in the pier main body, the filling concrete is placed. It is necessary to wait until the strength of the filling concrete is developed, and the construction period cannot be further shortened.

  Further, in the case of the three-dimensional intersection construction method described in Patent Document 2, the foundation strength at the time of erection is secured by using a steel shell as the footing, and the concrete can be placed after the pier is built, so that the process can be shortened. However, if the footing is made of steel, the manufacturing cost is excessive and the construction cost increases.

  Furthermore, the bridge pier connection structure described in Patent Document 3 contributes to rapid construction in that the bridge pier construction can be performed without waiting time after the pile body is created while adopting the footing-less structure. In order to absorb the misalignment of the lead, it is necessary to perform reference marking on the lower plate and to weld and fix the lower load transmission adjusting member at a position where the positions in the X and Y axis directions are matched. In addition, the work of fixing the lower load transmission adjusting member and the engagement portion of the upper load transmission adjusting member by welding or injecting unsaturated polyester resin or the like is required, so that the work such as welding or resin injection is complicated. There was a problem that it was a work to be done.

  Therefore, the main problem of the present invention is to simplify the structure of the connecting portion in the pier structure in which the pier column base is directly connected to the pile head without having a footing, and the pile misalignment. It can be constructed at a low cost with labor saving while absorbing the structure, and it is possible to perform the steps such as pier construction and superstructure construction in sequence without waiting for the time after the construction of the pile body. To provide a structure.

As the present invention according to claim 1 to solve the above-mentioned problem, in the pier structure of the structure in which the pile head and the steel pier column base are connected,
The connecting portion structure for connecting the pile head and the steel pier column base has a plurality of anchor bolt groups in which a lower end side is embedded in the pile head, and a height in the Z direction with respect to a screw portion of the anchor bolt group. A first stage holding member installed with the position adjusted, and a second stage holding placed on the upper surface of the first stage holding member with the position adjusted in the XY plane. And a plurality of clamps for connecting the first stage holding member and the second stage holding member, and the steel pier base is bolted to the upper surface of the second stage holding member, and There is provided a pier structure of a structure characterized in that a pierced concrete is cast around a steel pier including a connecting portion.

  In the present invention described in claim 1, as a connection portion structure between the pile head and the steel pier base, a plurality of anchor bolt groups in which the lower end side is embedded in the pile head, and a thread portion of the anchor bolt group The first stage holding member installed in a state in which the height position in the Z direction is adjusted with respect to the upper surface of the first stage holding member in a state in which the position adjustment in the XY plane has been made. The second stage holding member, and a plurality of clamps for connecting the first stage holding member and the second stage holding member.

  Here, the first stage holding member is a member having a height adjusting function and a leveling holding function (horizontal plane forming function), and by adjusting the position of the nut member screwed to the anchor bolt for mounting, Height adjustment and leveling adjustment are made. The second stage holding member is a member having a function of absorbing a pile core misalignment due to a construction error, and is positioned at a normal position in a state of being placed on the first stage holding member. Since the first stage holding member and the second stage holding member are connected to each other using a clamp, the second stage holding member can be easily positioned even if it is positioned at an arbitrary position. Can be linked.

  When the construction of the connecting portion is completed, the steel pier base is bolted to the upper surface of the second stage holding member, and concrete is placed around the steel pier including the connecting portion.

  By adopting the above connection part structure, the structure of the connection part is simplified, and construction can be performed at a labor-saving and low cost while absorbing the pile core misalignment. In addition, the strength of concrete is not expected as in the past, and various acting forces (vertical force, horizontal force and rotational moment) transmitted from the pier are directly connected to the pile body via the connection structure. Therefore, it is possible to perform the steps such as the construction of the pier and the superstructure immediately after the pile body is constructed without waiting for the time. In addition, in addition to assuming the protective function of the connection portion, the root-wrapped concrete can also function as a load-bearing member after curing. However, in the present invention, the root-wrap concrete is not required to be placed. Since the foundation structure has excellent strength characteristics, the root-wrapped concrete may be constructed at any time.

  As a second aspect of the present invention according to claim 2, the first stage holding member is a frame member made of a plurality of shapes having at least an upper flange or a shape having an upper flange. A pier structure is provided.

  According to the second aspect of the present invention, as the first stage holding member, a frame material comprising at least a plurality of profiles having an upper flange or a profile having an upper flange is used. Here, the reason why the profile having the upper flange is used is to facilitate the fastening with the clamping metal fitting.

  As a third aspect of the present invention according to claim 3, the second stage holding member includes a plurality of members having at least a lower flange on a lower surface side of a plate member having a plurality of bolt holes for connecting the steel piers. The leg member is integrally provided with the leg member, the leg member is placed on the first stage holding member, and the lower flange and the upper flange of the first stage are sandwiched by the sandwiching member. The pier structure for a structure according to claim 2, which is fastened by a fastener.

  The second aspect of the present invention is that the second stage holding member includes a plurality of legs made of a profile having at least a lower flange on the lower surface side of a plate member having a large number of bolt holes for connecting steel piers. A plate-like member integrally provided with a material is used. Accordingly, the lower flange of the leg member and the upper flange of the first stage can be easily fastened by the clamping fitting in a state where the second stage holding member is positioned at a proper position.

  According to a fourth aspect of the present invention, the anchor bolt is divided into an upper half portion and a lower half portion, and both are screwed and joined, and the lower half portion is buried when a concrete is placed in a pile. A pier structure for a structure according to any one of claims 1 to 3 is provided.

  In the present invention described in claim 4, when the pile head processing is performed by the static crushing material construction method described later, the anchor bolt is made to have a structure adapted to the construction method, and the lower half portion of the anchor bolt is made of the pile. By embedding when placing concrete, pile head processing and anchor bolt installation work can be labor-saving.

  As described in detail above, according to the present invention, the structure of the connecting portion between the pile head and the pier base is simplified, and construction can be performed at a labor-saving and low cost while easily absorbing the pile misalignment. In addition, the structure is such that the force from the pier is directly transmitted to the pile body without expecting the strength of the concrete, so the pier construction and superstructure can be built immediately without waiting for time after the pile body is constructed. These processes can be performed sequentially.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is a side view and a plan view showing a three-dimensional crossing bridge 1 in which the present pier structure is adopted, FIG. 2 is a front view of the pier part, and FIG. 3 is a front view showing a joint structure between a pile head and a pier base part. .

  As shown in FIG. 1, the three-dimensional crossing bridge 1 does not have a footing, and a footing-less pier structure in which the pile head of the pile body 2 and the lower end of the pier 3 are directly connected. 1 box main girder type superstructure 4 is mounted on the upper part of the pier 3.

  Here, the said pile body 2 is made into a cast-in-place pile, and is comprised from a concrete and a reinforcing bar. The pier 3 is a steel pier. Further, as shown in FIG. 2, a wound concrete 5 is placed around the base portion of the steel pier 3.

  In the present pier structure, the joint structure between the pile head and the pier base is simplified so that construction work can be saved while absorbing pile construction errors (pile core misalignment). By having a structure where the joint with the pier base has sufficient strength, the pier 3 can be set up and the superstructure 4 can be erected without waiting for the laying concrete to be placed and cured (hardened). It has become.

  Hereinafter, the joint structure between the pile head 2A and the pier 3 base will be described in detail.

  As shown in FIG. 3 and FIG. 4, the pier connecting portion structure includes a plurality of anchor bolts 6, 6... In which the lower end side is embedded in the pile head 2 A, and screw portions of the anchor bolts 6, 6. The position adjustment in the XY plane is made on the first stage holding member 7 installed in a state where the height position in the Z direction is adjusted with respect to 6a, and the upper surface of the first stage holding member 7. A second stage holding member 9 placed in a state in which the first stage holding member 7 and the second stage holding member 9 are connected to each other. The pier base 3A of the steel pier 3 is joined to the upper surface of the second stage holding member 9 by joint bolts 11, 11,.

  As the anchor bolt 6, a screw bolt having a nut screw portion 6 a formed at the upper end portion is used, and as shown in FIG. 5, the anchor bolt 6 is arranged at a predetermined interval along a rectangular line shape. In this example, it is divided into an upper half portion 6A and a lower half portion 6B, and both are screwed and joined, and the lower half portion 6B is installed in a buried state when the concrete is placed on the pile 2. ing. Details will be described later in the section of the construction procedure.

  As the first stage holding member 7, a plurality of shapes having at least an upper flange, for example, shapes such as channel steel and H-shape steel can be suitably used. A member in which a through hole is formed is used. As shown in FIG. 5, the first stage holding members 7, 7... Made of groove steel are arranged on the respective sides of the anchor bolts 6 installed at predetermined intervals in a rectangular line shape. Yes. In this example, an independent member is used for each side. However, a frame material in which the shape members are assembled in a frame shape can be used as the first stage holding member 7.

  As shown in FIG. 6, the second stage holding member 9 has at least a lower flange on the lower surface side of a plate member 9 </ b> A having a large number of bolt holes 9 b, 9 b, for connecting the steel pier 3. A plate-like member is integrally provided with a number of leg members 9B made of a shape material such as a grooved steel or an H-shaped steel. Specifically, as shown in FIG. 6, along the circumferential direction on the lower surface side of the outer peripheral edge of the hollow rectangular plate 9 </ b> A in which the opening 9 a is formed in the central portion in consideration of the wraparound of the root-wrapped concrete 5. It is set as the plate-shaped member which fixed the leg material 9B, 9B ... which consists of a grooved steel by welding etc. at predetermined intervals. At this time, the leg material 9B is oriented so that the longitudinal direction of the member is arranged orthogonal to the side direction.

  The clamp 10 for connecting the first stage holding member 7 and the second stage holding member 9 is, as shown in detail in FIG. 8, in the both-end screw through holes of the substantially U-shaped steel member 10A. It is a clamping bracket in which the bolt members 10B and 10B are screwed so that the screw portions are in a butted state, and is a coupling bracket that is joined by clamping members such as steel materials in temporary construction such as construction and civil engineering sites. Trade name: Bullman] can be used as they are.

  As shown in FIG. 7, when the second stage holding member 9 is placed on the upper surface of the first stage holding member 7, the legs 9B of the second stage holding member 9 hold the first stage. The upper stage flange 7b of the first stage holding member and the leg material of the second stage holding member 9 in a state where the second stage holding member 9 is positioned at a normal position. The lower flange of 9B is connected so as to be clamped by the clamping brackets 10, 10,. At this time, as shown in FIG. 7, the length dimension L of the leg material 9 </ b> B of the second stage holding member is less than the width dimension B of the first stage holding member 7. It is desirable to ensure dimensions that can be absorbed sufficiently. For example, it is desirable to set L = B + 20 to 30 cm so as to absorb a construction error of about ± 10 to 15 cm of the pile body 2 that can generally occur.

[Construction procedure]
Next, a procedure for connecting the pile head and the pier will be described in detail with reference to FIGS. 9 and 10.

(Pile head treatment)
In this example, the static crushing method is adopted as the pile head processing of the pile body 2. In this static crushing method, in order to remove the piled-up concrete part of the pile head, the steel bar is covered with a sleeve (edge cutting material) in advance, and the concrete is placed with the static crushing material in place. Then, a crack is generated at the cutting position by the static crushed material, and then the surplus concrete portion is pulled out as it is with a crane or the like.

  First, as shown in FIG. 9A, the lower half portion 6B of the anchor bolt 6 is installed at a predetermined position before placing the pile body 2 into the concrete. At this time, the static crushing material is installed at the crushing position, and the anchor bolt 6 on the upper side of the crushing position is covered with the edge cutting sleeve, and the reinforcing bar 13 is also covered with the edge cutting sleeve. Then, concrete is laid and the pile body 2 is created.

  Next, as shown in FIG. 9 (B), after waiting for the occurrence of cracks due to the static crushed material, the surplus concrete above the crushing position is pulled up with a crane or the like, and the upper side of the anchor bolt lower half 6B And the upper side of the reinforcing bar 13 are exposed.

(Attaching the connection bracket)
As shown in FIG. 9C, after the upper half portion 6A of the anchor bolt 6 is screwed and connected to the exposed lower half portion 6B of the anchor bolt, the first stage holding with respect to the anchor bolt 6 is performed. The member 7 is attached.

  As shown in FIG. 11, the first stage holding member 7 is attached to the anchor bolt 6 with a spherical flange nut 8 (hereinafter referred to as a flange nut) with respect to a screw portion 6 a formed at the upper end of the anchor bolt 6. Is installed in a state where the anchor bolt 6 is inserted through the through hole of the first stage holding member 7 and the spherical washer 12 is installed on the upper surface side of the lower flange 7a. And it is set as the structure fastened with the flange nut 8. FIG. At this time, the height position of the first stage holding member 7 and the leveling are adjusted by adjusting the height position of the lower flange nut 8. By adopting the spherical washer 12, some inclination due to the construction error of the anchor bolt 6 is absorbed.

  If the first stage holding member 7 is set at a predetermined height position and adjusted in leveling, the first stage holding member 7 is placed on the upper surface of the first stage holding member 7 as shown in FIG. A two-stage holding member 9 is placed. Then, if the second stage holding member 9 is moved in the XY plane (in the horizontal plane) and positioned at a proper position, as shown in FIG. 10 (E), the first stage holding member 9 The upper flange 7b and the lower flange of the leg member 9B of the second stage holding member 9 are connected so as to be clamped by the clamping brackets 10, 10,.

  When the second stage holding member 9 is fixed in the proper position, the base column 3A of the bridge pier 3 is placed on the upper surface of the second stage holding member 9 as shown in FIG. The two bolts are connected by connecting bolts 11, 11. As shown in FIG. 12, the pier 3 is composed of a pier base portion 3A around which a pierced concrete 5 is placed, and a pier main body 3B exposed on the ground. The pier base portion 3A is a peripheral surface. In order to secure adhesion to the root-wrapped concrete 5, a large number of stud dowels 14, 14,... Are planted, and the bottom plate 3C is formed with an opening 3c in the center in consideration of the wraparound of the concrete. Are provided with bolt through holes 3d, 3d... In the circumferential direction, and the pier body 3B is flanged to the upper end of the pier base 3A.

[Other examples]
(1) In the above embodiment, the static crushing material method is adopted for the pile head treatment. However, the pile head treatment may be performed with a concrete chip as usual. Further, although the anchor bolt 6 has a two-part structure of the upper half portion 6A and the lower half portion 6B, it may be a single piece. Further, instead of burying in the pile body 2 in advance, the anchor hole may be drilled and the anchor bolt 6 may be implanted after finishing the pile head processing.
(2) In the above embodiment, the present invention has been described in detail by taking the pier structure in a three-dimensional intersection bridge as an example. However, the present invention can be applied to general civil engineering structures having piers.

A three-dimensional crossing bridge 1 in which this pier structure is adopted is shown, (A) is a side view and (B) is a plan view. It is a pier part front view. It is a front view which shows the junction part structure of a pile head and a pier base. It is an exploded view of a junction structure. FIG. 5 is a plan view of the first stage holding member 7 (viewed along arrow VV in FIG. 3). It is the top view and side view of the 2nd stage holding member 9. It is a cross-sectional view (the VII-VII line view of FIG. 3) which shows the connection part of the 1st stage holding member 7 and the 2nd stage holding member 9. FIG. 3 is a side view of the clamp metal fitting 10. FIG. It is a construction procedure figure (the 1). It is construction procedure figure (the 2). FIG. 6 is a diagram illustrating how to attach the first stage holding member 7 to the anchor bolt 6. The pier 3 is shown, (A) is a side view, (B) is a view taken along the line B-B in (A), and (C) is a view taken along the line C-C in (A). It is a construction procedure figure of the conventional footing foundation.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Three-dimensional intersection bridge, 2 ... Pile body, 3 ... Bridge pier, 4 ... Superstructure, 5 ... Neck winding concrete, 6 ... Anchor bolt, 6A ... Upper half part, 6B ... Lower half part, 7 ... First stage holding member , 8 ... Flange nut, 9 ... Second stage holding member, 10 ... Clamping bracket, 11 ... Joining bolt, 12 ... Spherical washer

Claims (4)

In the pier structure of the structure that connects the pile head and the steel pier base,
The connecting portion structure for connecting the pile head and the steel pier column base has a plurality of anchor bolt groups in which a lower end side is embedded in the pile head, and a height in the Z direction with respect to a screw portion of the anchor bolt group. A first stage holding member installed with the position adjusted, and a second stage holding placed on the upper surface of the first stage holding member with the position adjusted in the XY plane. And a plurality of clamps for connecting the first stage holding member and the second stage holding member, and the steel pier base is bolted to the upper surface of the second stage holding member, and A pier structure of a structure, characterized in that a root-wrapped concrete is cast around a steel pier including a connecting portion.   2. The pier structure for a structure according to claim 1, wherein the first stage holding member is a frame member made of a plurality of profiles having at least an upper flange or a profile having an upper flange.   The second stage holding member is integrally provided with a number of legs made of a shape having at least a lower flange on the lower surface side of a plate having a number of bolt holes for connecting the steel pier column base. A plate-shaped member, wherein the leg member is placed on the first stage holding member, and the lower flange and the upper flange of the first stage are fastened by the clamping bracket. The pier structure of the structure according to 2. The said anchor bolt is divided | segmented into an upper half part and a lower half part, it is set as the structure where both are screwed together, and the said lower half part is embed | buried and installed at the time of concrete placement of a pile. The pier structure of the structure described in 1.

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