JP2012162862A - Scaffold for pier construction and pier construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve accuracy of pile driving without the need of large-scale work requiring time before the pile driving, to reduce the labor and time of readjusting the direction and height of piles after the pile driving, and to reduce the risk of high-place work, when constructing a pile type pier.SOLUTION: A scaffold for pier construction is used when constructing a pier, and includes: a locking part which is used by being overhung in a cantilever form so as to extend from a pier complete part to a pier incomplete part where the pier is to be extended, and is lockable to the pier complete part from an upper part; and an extension part extending to the pier incomplete part when the locking part is locked to the pier complete part.

Description

  The present invention relates to a pier construction scaffold used during construction work of a pile pier and a pier construction method using the scaffold.

  Conventionally, when constructing a pile-type pier in a mountainous area, etc., a pile that supports an unfinished pier part is placed in advance using the already completed pier part as a scaffold, and the pile and the completed pier part are not The pier is constructed by applying the main girder of the completed part (see, for example, Patent Document 1 below).

  However, in such a conventional construction method, since the next pile is driven in advance using only the completed part of the pier as a scaffold, it is difficult to accurately adjust the driving position of the pile, and the accuracy of pile driving is poor. For this reason, for example, it is necessary to readjust the pile and the direction and height of the pile once, and there is a problem that it is not only troublesome and time-consuming, but also dangerous work at high places is required. .

In view of the above problems, the applicant of the present application has proposed the invention described in Patent Document 2 below.
According to the present invention, a main girder of an unfinished pier part to be extended with a pile head fixing pipe installed in advance is cantilevered from a completed part of the pier, and the pier is extended along the main girder of the unfinished part of the pier. The unfinished part of the pier is adjusted by adjusting the tension of the wire spanned between the protruding end of the unfinished main girder and the completed part of the pier so that it is almost parallel to the main girder of the unfinished part of the pier. Is a pile type pier construction method in which a tubular pile is piled through a pile head fixing pipe installed on the main girder of the unfinished pier.

The present invention is superior in that the pile driving accuracy for supporting the unfinished portion of the pier can be improved and the work at high places can be reduced as compared with the above-described prior art.
However, the main girder of the unfinished pier used in this invention has substantially the same width as the entire width of the pier, requires high rigidity as the main girder, and further includes a pile head fixing pipe, It becomes heavy. Therefore, in order to project this main girder in a cantilevered manner and hold it accurately and accurately, a large and careful work is required, and it takes time to pile up, which is not preferable in terms of work efficiency. .

Japanese Patent No. 45567080 Japanese Patent No. 3043320

  The present invention was made to solve the problems of the conventional construction method described above, and when constructing a pile-type pier, without requiring a large and time-consuming work before pile driving, A pier construction scaffold and this scaffold that can improve the accuracy of pile driving, reduce the labor and time to readjust the direction and height of piles after pile driving, and reduce the danger of working at heights It is intended to provide a pier construction method using

  The invention according to claim 1 is a pier construction scaffold used in the pier construction work, and is cantilevered so as to extend from the pier completion part toward the pier unfinished part to be extended. A locking portion that can be locked from above with respect to the pier completed portion, and an extension portion that extends toward the pier unfinished portion when the locking portion is locked to the pier completed portion, The present invention relates to a pier construction scaffold characterized by comprising:

  According to a second aspect of the present invention, the locking portion includes a pair of left and right locking members formed at intervals, and the extension portion extends in parallel from each of the pair of left and right locking members. The pier construction scaffold according to claim 1, comprising a pair of extending members and a connecting member for connecting the pair of left and right extending members.

  The invention according to claim 3 is a pier construction method using the pier construction scaffold according to claim 1 or 2, wherein the pier construction scaffold is engaged with an engaging portion of the pier construction scaffold. , A scaffold installation step in which the pier construction scaffold is installed in a cantilever manner so as to extend from the pier completion part toward the pier unfinished part where the pier should be extended, and extension of the installed pier construction scaffold A pile erection process in which a tubular pile is erected on the ground while guiding the tubular pile in the vertical direction in the vicinity of the end, and the head of the erected pile is cut at substantially the same height as the upper surface of the extension part of the pier construction scaffolding A pile head cutting process, a pile head cap fixing process in which a pile head cap having a flat plate attached to the upper part of the cylinder is placed on the cut pile head, and a cross beam is placed on the plate of the pile head cap. The cross beam fixing process for fixing, and the upper part of the cross beam A main girder fixed ligating the main beam of the pier finished part to fix the main girder, to a method pier construction which is characterized in that it comprises a and a scaffold removal step of removing the pier building scaffolds.

  The invention according to claim 4 relates to the pier construction method according to claim 3, wherein, in the scaffold installation step, the plurality of pier construction scaffolds are installed side by side in the width direction of the pier completed portion.

  In the invention according to claim 5, the pile standing step includes a table machine installation step of installing a rotary table machine in an upper portion near the extension end of the pier construction scaffold, and a drilling rod is inserted into the rotary table machine. And a drilling step for drilling the ground using the excavation rod, and a pile erection step for building the tubular pile in the hole formed by the drilling step. The pier construction method according to claim 3.

  The invention according to claim 6 is characterized in that the pile erection step includes a guide material installation step in which an anti-rotation guide material provided with a pile rotation prevention mechanism is installed on an upper portion in the vicinity of the extension end of the pier construction scaffold, and the rotation prevention A pile driving step of inserting the tubular pile having the upper end held by a hydraulic excavator suspended by a crane into the conductive material, and driving the tubular pile into the ground by the hydraulic excavator; The pier construction method according to claim 3, comprising:

  In the invention according to claim 7, the pile standing step includes a conductor installation step in which a conductor is installed near the extended end of the pier construction scaffold, and a vibrator hammer suspended in the conductor by a crane The pier construction method according to claim 3, further comprising: a pile driving step of inserting the tubular pile having the upper end portion held in the step and driving the tubular pile into the ground by the vibro hammer.

According to the first aspect of the present invention, since the cantilever is used so as to extend from the completed part of the pier toward the unfinished part of the pier, piles are placed in the unfinished part of the pier. Since it can be used as a scaffold when staking and the extension part can be used as a conductor when placing a pile on the ground, it is possible to improve the accuracy of pile driving, and piles after pile driving It is possible to reduce the labor and time for re-adjusting the orientation and height. In addition, it is possible to reduce the danger of working at heights.
Furthermore, since a locking portion that can be locked from above with respect to the pier completed portion is provided, the locking portion is engaged with the pier completed portion by hanging and lowering the pier construction scaffold by a crane. In addition to being able to stop, it can be unlocked by lifting and lifting it with a crane. Therefore, installation and removal of the pier construction scaffold can be easily and quickly performed without requiring a large-scale work, and the work efficiency can be greatly improved.
In addition, the removed pier construction scaffold can be used not only repeatedly in the process of extending the pier at the same site, but also reused at another site, so that the construction cost can be reduced.

  According to the second aspect of the present invention, the locking portion includes a pair of left and right locking members formed at an interval, and the extension portion is parallel to each other from the pair of left and right locking members. Since it is composed of a pair of left and right extension members that extend, and has a connecting member that connects the pair of left and right extension members, it is possible to form a scaffold for building a pier with light weight and high rigidity and to complete a pier It can be securely fixed to the part. Moreover, since a connection member can be made to act as a conducting material at the time of driving a pile on the ground, the precision of pile driving can be improved.

According to the invention according to claim 3, the scaffold for constructing the pier is installed in a cantilever manner so as to extend from the completed part of the pier toward the unfinished part of the pier where the pier should be extended. To improve the accuracy of pile driving without requiring a large and time-consuming work before pile driving, since the tubular piles are erected on the ground in the vicinity of the extended end of the scaffold while being guided vertically This makes it possible to reduce labor and time for readjusting the orientation and height of the pile after driving. In addition, it is possible to reduce the danger of working at heights.
Furthermore, the head of the erected pile is cut at approximately the same height as the upper surface of the extension of the pier construction scaffold, and the pile head cap with a flat plate attached to the upper part of the cylinder is put on the cut pile head. Fixing, fixing the cross girder on the flat plate of the pile head cap, fixing the main girder to the top of the cross girder and connecting it with the main girder of the completed part of the pier, so each work using the pier construction scaffolding It can be performed safely and efficiently, and the main beam and the horizontal beam can be fixed accurately and reliably.

  According to the invention which concerns on Claim 4, in a scaffold installation process, since the several pier construction scaffolds are installed side by side in the width direction of a pier completion part, the weight of one pier construction scaffold can be reduced. Therefore, installation of the pier construction scaffold can be easily performed with good workability without requiring a large-scale work, and work efficiency can be improved.

  According to the invention which concerns on Claim 5, a rotary table machine is installed in the upper part vicinity of the extension end part of the scaffold for building a pier, the excavation rod is inserted in the rotary table machine, and the ground is removed using the excavation rod. Since the pile is erected by drilling and building a tubular pile in the formed hole, it is possible to perform pile driving with high accuracy, and the trouble of readjusting the direction and height of the pile after pile driving And save time.

  According to the invention which concerns on Claim 6, the antirotation conducting material provided with the pile rotation prevention mechanism was installed in the upper part vicinity of the extension end part of the scaffold for pier construction, and the hydraulic type suspended by the antirotation conducting material by the crane Since the pile is erected by inserting a tubular pile whose upper end is held by the excavator and driving the tubular pile into the ground by a hydraulic excavator, it is possible to perform pile driving with high accuracy. It is possible to reduce labor and time for readjusting the direction and height of the pile after pile driving.

  According to the invention which concerns on Claim 7, it installs a conducting material in the upper part vicinity of the extension end part of the scaffold for pier construction, and the tubular pile by which the upper end part was hold | maintained with the vibro hammer suspended by the crane on the conducting material. Since the pile is erected by inserting and inserting a tubular pile into the ground with a vibro hammer, it is possible to perform pile driving with high accuracy, and the time and effort to readjust the direction and height of the pile after pile driving are reduced. Can be reduced.

It is a perspective view which shows an example of the scaffold for pier construction which concerns on this invention. It is a figure which shows 1 process (scaffold installation process) of the pier construction method which concerns on this invention. It is a figure which shows one process (The drilling process in the 1st method of a pile standing-up process) of the pier construction method which concerns on this invention. It is a figure which shows 1 process (the pile construction process in the 1st method of a pile standing-up process) of the pier construction method which concerns on this invention. It is a figure which shows 1 process (the pile placing process in the 2nd method of a pile standing-up process) of the pier construction method which concerns on this invention. It is a figure which shows 1 process (the pile placing process in the 3rd method of a pile standing-up process) of the pier construction method which concerns on this invention. It is a figure which shows one process (pile head cutting process) of the pier construction method which concerns on this invention. It is a figure which shows 1 process (pile head cap fixing process) of the pier construction method which concerns on this invention. It is a figure which shows one process (cross girder fixing process) of the pier construction method which concerns on this invention. It is a figure which shows one process (main girder fixing process) of the pier construction method which concerns on this invention. It is a figure which shows 1 process (scaffold removal process) of the pier construction method which concerns on this invention.

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a pier construction scaffold and a pier construction method according to the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing an example of a pier construction scaffold according to the present invention.
The pier construction scaffold (1) according to the present invention is a scaffold used in the pier construction work, and extends from the pier completion part toward the pier unfinished part to be extended, as will be described later. So that it cantilevered out. (See FIGS. 2 to 11)

The pier construction scaffolding (1) extends the pier when the locking part (2) that can be locked to the pier completed part from above and the locking part (2) is locked to the pier completed part. And an extension portion (3) installed so as to extend in a substantially horizontal direction in a direction to be performed (hereinafter abbreviated as an extension direction).
The pier construction scaffold (1) is made of, for example, steel.

The locking part (2) is composed of a pair of left and right locking members (2a) (2b) formed at a predetermined interval. The distance between the pair of left and right locking members (2a) and (2b) can be set to 1500 mm, for example, but is not limited thereto. The number of pier construction scaffolds (1) to be installed can be set according to the number of piers in the width direction of the pier completed part. Basically, when the number of piers is N, the number of pier construction scaffolds (1) is set to N-1. In other words, one pier construction scaffold (1) is installed when the number of piers is two (one set), and two are installed side by side in the pier width direction when the number of piers is three (two sets). The
Each locking member (2a) (2b) consists of two vertical members having different lengths extending in the vertical direction in parallel with each other, and a horizontal member connecting the upper ends of these two vertical members. When the cross beam of the pier completed part is fitted into the space (5) surrounded by the two vertical members and the horizontal member, the locking part (2) is locked to the pier completed part.

The extension portion (3) includes a pair of left and right extension members (3a) and (3b) extending in parallel with each other from the pair of left and right locking members (2a) and (2b). More specifically, one end of the extension part (3) extends in a direction perpendicular to the longitudinal member at a position closer to the lower side of the longer longitudinal member (2c) of the locking members (2a) and (2b). So that they are connected.
The extension members (3a) and (3b) have a truss structure including an upper material, a lower material, and a connecting material that connects the upper material and the lower material. This realizes high strength while being lightweight.
On the upper surface of the upper member of the extension members (3a) and (3b), a ring-shaped hooking portion (6) is provided. One end of a chain block that connects the pier construction scaffold (1) and the pier completed part is hooked to the hook portion (6). Thereby, it is possible to prevent the pier construction scaffold (1) from tilting forward (the tip is lowered).

The pair of left and right extending members (3a) (3b) are connected by a connecting member (4).
The connecting member (4) includes a plurality of members extending in a direction perpendicular to the extending members (3a) and (3b) and arranged in parallel to each other with an interval in the extending direction. The connecting member (4) includes an upper connecting member that connects the upper members of the extending members (3a) and (3b) and a lower connecting member that connects the lower members. Since these upper connecting members and lower connecting members are arranged side by side in the vertical direction, they can function as a conductive material for guiding the pile in the vertical direction.

Next, the pier construction method according to the present invention will be described with reference to FIGS.
<1. Scaffolding process>
First, the pier construction scaffold (1) is extended from the pier completion part (A) by locking the locking part (2) of the pier construction scaffold (1) to the pier completion part (A). It is installed in a cantilevered manner so as to extend toward the unfinished pier (B). (See Figure 2)
Specifically, after lifting the pier construction scaffold (1) by the crane (7) arranged in the pier completion part (A), the space (5) of the locking members (2a) (2b) (see FIG. 1) The anchor construction part (2) of the pier construction scaffold (1) is locked to the pier construction part (A) by lowering the pier construction scaffold (1) until the horizontal girder of the pier completion part fits in To do. Subsequently, one end of the chain block (8) is hooked to the hooking portion (6) of the pier construction scaffold (1), and the other end is hooked to the pier completion part (A), so that the chain block (8 ) Connect the completed pier part (A) and the pier construction scaffold (1).
The number of pier construction scaffolds (1) to be installed may be one or more, and is appropriately set according to the width of the pier completion part (A) (in other words, the width of the pier to be constructed). For example, if the width of the pier construction scaffold (1) is substantially the same as the width of the pier completion part, one may be sufficient, and the width of the pier construction scaffold (1) is about half the width of the pier completion part. In some cases, two are used side by side. FIG. 2 shows a state where two pier construction scaffolds (1) are installed side by side in the pier width direction (perpendicular to the paper surface).

<2. Pile standing process>
In the vicinity of the extended end of the pier construction scaffold (1) installed by the scaffold installation process, a tubular pile (steel pipe pile, etc.) is erected on the ground while guiding in the vertical direction.
This pile erection process is not limited to one type of method, and a plurality of types of methods can be properly used depending on the situation of the construction site. Hereinafter, three typical methods will be exemplified.

<2-1. First Method>
In the first method, the pile erection process includes a table machine installation process, a drilling process, and a pile erection process.
In the table machine installation step, the rotary table machine (9) is installed on the upper part in the vicinity of the extension end of the pier construction scaffold (1).
In the drilling step, as shown in FIG. 3, the excavating rod (10) is inserted into the installed rotary table machine (9) and the ground is drilled using the excavating rod (10). Specifically, a well-known down-the-hole hammer excavation rod (10) having a bid and an air hammer is inserted into the rotary table machine (9), and the rotation of the bid by the rotation of the excavation rod (10) and the blow by the air hammer are performed. To excavate the ground.
In the pile building process, as shown in FIG. 4, a tubular pile (11) such as a steel pipe pile is suspended by a crane and built in a hole formed by the drilling process. At this time, the pier construction scaffold (1) plays a role of a guiding material for guiding the tubular pile (11) in the vertical direction.

<2-2. Second method>
In the second method, the pile standing process includes a conductive material installation process and a pile driving process.
In the guide material installation step, an anti-rotation guide material (12) equipped with a pile rotation prevention mechanism is installed on the upper part in the vicinity of the extended end of the pier construction scaffold (1). As shown in the enlarged plan view drawn to the lower right with an arrow in FIG. 5, the anti-rotation conducting material (12) extends along the circumference of a circular hole through which a tubular pile (11) such as a steel pipe pile is inserted. Three anti-rotation rollers (13) are provided. The anti-rotation roller (13) is a drum-shaped roller that closely contacts the outer periphery of the pile when the pile (11) is inserted through the hole. As a result, the anti-rotation roller (13) rotates around the horizontal axis when the pile (11) is inserted through the hole to guide the pile (11) in the vertical direction and prevents the rotation of the pile (11) itself. can do.
In the pile placing process, as shown in FIG. 5, a pile (11) having an upper end held by a hydraulic excavator (suspended auger) (14) suspended by a crane on the anti-rotation conductor (12). ) And the pile (11) is driven into the ground by the hydraulic excavator (14).

<2-3. Third method>
In the third method, the pile standing process includes a conductive material installation process and a pile driving process.
In the guide material installation step, a guide material (15) for guiding the pile (11) in the vertical direction is installed on the upper part in the vicinity of the extended end of the pier construction scaffold (1).
In the pile placing process, as shown in FIG. 6, a pile (11) having an upper end held by a vibrator hammer (vibrator) (16) suspended by a crane is inserted into the conductor (15). The pile (11) is driven into the ground by the vibro hammer (16).

  The pile (11) erected by the first to third methods is fixed to the ground by filling mortar into the root portion.

<3. Pile head cutting process>
The head (11a) of the pile (11) erected by the pile erection process is cut and removed at substantially the same height as the upper surface of the extension (3) of the pier construction scaffold (1). (See Figure 7)

<4. Pile head cap fixing process>
A handrail (17) is attached along the upper surface of the extension (3) of the pier construction scaffold (1), and the head of the pile (11) cut by the pile head cutting process is covered with a pile head cap (18). And fix. (See Figure 8)
The pile head cap (18) has a structure in which a flat plate (18b) is attached to an upper portion of a cylinder (18a) as shown in an enlarged front view drawn to the lower right by an arrow in FIG. The bolt (21) is screwed into a plurality of bolt holes provided along the circumferential direction of the cylinder (18a), and the pile head cap ( 18) is fixed.

<5. Cross beam fixing process>
A cross beam (19) is fixed with a bolt etc. on the flat plate (18b) of the pile head cap (18) fixed to the pile head by the pile head cap fixing process. (See FIG. 9) The cross beam (19) is made of, for example, H-shaped steel as shown in the enlarged plan view drawn to the lower right with an arrow in FIG. 9, and its length direction is perpendicular to the extension direction (pier width) Direction).

<6. Main girder fixing process>
The main girder (20) made of H-section steel or the like is fixed to the upper part of the cross girder (19) fixed by the cross girder fixing process with a bolt or the like. The main girder (20) is fixed so that the length direction is the extension direction, and the end of the main girder (20) is connected to the main girder (A1) of the pier completed part (A). (See Figure 10)

<7. Scaffold removal process>
The pier construction scaffold (1) is lifted and removed by a crane, and a lining board (21) is installed. (See Fig. 11) The removed pier construction scaffold (1) is used again when the pier is further extended.

<8. Beam connection process>
By connecting the pile (11) erected by the above process and the pile (A2) of the pier completed part (A) by a beam (not shown) like the pier completed part (A), the pier completed part is extended. It will be in the state.

  Thereafter, the pier having a required length can be constructed by repeating the above-described scaffold installation process to the beam connection process for the extended pier completed part.

  INDUSTRIAL APPLICABILITY The pier construction scaffold and the pier construction method according to the present invention are suitably used for constructing a pile-type pier in a site where it is difficult to perform pile driving with high accuracy such as a mountainous area.

DESCRIPTION OF SYMBOLS 1 Scaffolding for pier construction 2 Locking part 2a Locking member 2b Locking member 3 Extension part 4 Linking member 9 Rotary table machine 10 Excavation rod 11 Pile 12 Anti-rotation guide 14 Hydraulic excavator (hanging auger)
15 Conductor 16 Vibro Hammer 18 Pile Head Cap 18a Cylinder 18b Flat Plate 19 Horizontal Girder 20 Main Girder A Pier completed part

Claims (7)

A pier construction scaffold used during pier construction work,
It is used in a cantilevered manner so as to extend from the pier completed part to the pier unfinished part that should be extended,
A locking part that can be locked from above with respect to the pier completion part,
When the locking portion is locked to the pier completion part, an extension that extends toward the pier unfinished part,
A scaffold for building a pier, characterized by comprising: The locking part is composed of a pair of left and right locking members formed at intervals,
The extension portion includes a pair of left and right extension members extending in parallel with each other from the pair of left and right engaging members, and includes a connecting member that connects the pair of left and right extension members. Item (1) Scaffold for pier construction. A pier construction method using the pier construction scaffold according to claim 1 or 2,
By locking the locking part of the pier construction scaffold to the pier completion part, the pier construction scaffold is extended from the pier completion part toward the pier unfinished part where the pier should be extended. Scaffolding installation process that overhangs and installs,
A pile erection process in which a tubular pile is erected on the ground in the vicinity of the extended end of the installed pier construction scaffold;
Pile head cutting step of cutting the head of the pile that is erected at the same height as the upper surface of the extension part of the pier construction scaffold,
A pile head cap fixing step for fixing the pile head with a pile head cap having a flat plate attached to the top of the cylinder, and fixing the cut pile head;
A cross beam fixing step of fixing the cross beam on the flat plate of the pile head cap;
A main girder fixing step of fixing the main girder to the upper part of the horizontal girder and connecting it to the main girder of the pier completed part;
A scaffold removal step of removing the scaffold for building the pier;
A pier construction method characterized by comprising:   4. The pier construction method according to claim 3, wherein, in the scaffold installation step, a plurality of the pier construction scaffolds are arranged side by side in the width direction of the pier completion part. The pile erection process is
A table machine installation step of installing a rotary table machine on the upper part near the extended end of the pier construction scaffold;
A drilling step of inserting a drilling rod through the rotary table machine and drilling the ground using the drilling rod;
In the hole formed by the drilling step, a pile erection step of erected the tubular pile,
The pier construction method according to claim 3, comprising: The pile erection process is
A conducting material installation step of installing an anti-rotation conducting material provided with a pile rotation preventing mechanism on the upper part in the vicinity of the extended end of the pier construction scaffold,
Pile driving for inserting the tubular pile, which is held at the upper end by a hydraulic excavator suspended by a crane, into the anti-rotation guide, and driving the tubular pile into the ground by the hydraulic excavator Process,
The pier construction method according to claim 3, comprising: The pile erection process is
A conducting material installation step of installing a conducting material on the upper part in the vicinity of the extended end of the pier construction scaffold;
A pile driving step of inserting the tubular pile, the upper end of which is held by a vibratory hammer suspended by a crane, into the conductor, and driving the tubular pile into the ground by the vibratory hammer,
The pier construction method according to claim 3, comprising:

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