JP6649917B2 - Reinforcement method of temporary pier substructure - Google Patents

Description

  The present invention relates to a method of reinforcing a temporary pier substructure in which adjacent support piles are connected and reinforced by a reinforcing material erected in a direction transverse to the bridge axis or in a longitudinal direction of the bridge axis.

In temporary pier construction, the reinforcement technology of the temporary pier substructure that reinforces multiple support piles in the longitudinal direction or transverse direction of the bridge axis is well known, and reinforcement horizontal joints, vertical braces, horizontal braces between adjacent support piles Various connecting means for connecting both ends of a reinforcing material such as the above have been proposed.
[Connecting Means 1] Attachment fittings are welded to the peripheral surface of the support pile at the site, and the ends of the reinforcing members are welded to these attachments at the site (FIG. 10 of Patent Document 1).
[Connecting means 2] A connecting pipe having a diameter larger than that of the supporting pile is fixed to the end of the reinforcing material in advance, and mortar or the like is placed in an annular space formed between the peripheral surface of the connecting pipe and the connecting pipe inserted through the supporting pile. After filling, the support pile and the connecting pipe are fixedly connected (FIG. 4 of Patent Document 2).
[Connecting means 3]
A method in which a reinforcing material is configured to be stretchable, and both ends of the expanded reinforcing material are pressed against the outer peripheral surface of a support pile and connected (Patent Document 3)
[Connecting means 4]
A method in which a clamp mechanism of one hinge is added to both ends of an extendable reinforcing material, and the clamp mechanism is clamped to a support pile and connected (Patent Document 4)

JP 2005-282280 A JP 2014-5652 A JP 2003-193428 A JP-A-2004-244874

The conventional reinforcement technology of the temporary pier substructure has the following problems.
<1> When the connecting means 1 to be connected by welding is carried out on the ground, the work is carried out at a high place, so that the work involves a great danger, and quality control is difficult and the construction period is long.
<2> When the connecting means 1 by welding is performed in water, the work efficiency is reduced due to the underwater work by the diver, and the construction period is prolonged as compared with the ground work.
<3> The connecting means 2 in which the fixing agent such as mortar is filled and fixed between the peripheral surfaces of the support pile and the connecting pipe, requires a large number of man-hours and construction costs, and is not suitable for underwater work.
<4> In the connecting means 1 and 2 for fixing the supporting pile and the reinforcing material through welding or a fixing material, the dismantled temporary material cannot be reused, which is uneconomical.
<5> The connecting means 3 for pressing the telescopic reinforcing material against the support pile has a structure in which a hydraulic cylinder is incorporated in the reinforcing material, so that the cost increases because of the structure. Could come off.
<6> The connecting means 4 having one hinge clamping mechanism added to both ends of the extendable reinforcing member has a complicated structure incorporating a swinging mechanism for opening and closing the clamp mechanism in addition to the extending and contracting mechanism of the reinforcing member. Therefore, the cost is extremely high, and since the angle of expansion of the clamp mechanism is small, the reinforcing member cannot be moved in parallel to the support pile in the horizontal direction and set between the adjacent support piles.

The present invention has been made in view of the above points, and an object of the present invention is to provide a method for reinforcing the following substructure of a pier.
<1> A cross reinforcement or a longitudinal reinforcement can be suspended between the adjacent support piles in a stable posture from the side of the support pile and installed.
<2> The pier substructure can be reinforced efficiently in a short period of time.
<3> Removable connection between the support pile and the transverse reinforcement, or between the support pile and the longitudinal reinforcement, by simple operation without the on-site welding.
<4> A connection between the support pile and the transverse reinforcement, or between the support pile and the longitudinal reinforcement, by absorbing the construction error.
<5> When underwater work is involved, the diver's underwater work time can be significantly reduced.
<6> The structure of the clamp device can be simplified and can be manufactured at low cost.

The present invention provides a cross reinforcement between a plurality of support piles adjacent to each other in the bridge axis cross direction, and a longitudinal reinforcement between a plurality of support piles adjacent to each other in the bridge axis longitudinal direction. This is an invention of a method for reinforcing a temporary pier substructure to be reinforced by reinforcement.
At the time of construction, a clamping device having a two-hinged structure is attached to both ends of the transverse reinforcing member or the longitudinal reinforcing member so as to be able to advance and retreat in advance.
The clamp device is retracted so that the clamp device does not collide with the support pile when the transverse reinforcing member or the longitudinal reinforcing member is suspended, and the pair of holding arms constituting the clamp device are expanded.
In this way, the transverse reinforcement or the longitudinal reinforcement is suspended from the side of the support pile between the adjacent support piles, and the clamp device is held and fixed to the support pile, so that the space between the adjacent support piles is fixed. A cross reinforcement or a longitudinal reinforcement is erected and reinforced.
The mechanical clamp device for a temporary pier comprises a combination of a full-circle clamp or a pair of semi-circular clamps.
The all-around clamp includes a pair of holding arms having a length capable of covering the support pile.
The semi-peripheral clamp includes a pair of holding arms having a length capable of covering the semi-periphery of the support pile.
The mechanical clamp device for a temporary pier may be configured with a combination of a semi-circumferential clamp and an auxiliary semi-circular clamp.
Each of the full-circumferential clamp, the semi-peripheral clamp, and the auxiliary semi-peripheral clamp has a pair of holding arms pivotally supported by a pair of vertically arranged pivots so as to open and close horizontally. Can be expanded to an angle at which the pair of holding arms does not collide with the support pile when the transverse reinforcement or the longitudinal reinforcement is positioned between adjacent support piles.
The support pile is not limited to a steel pipe having a circular cross section, and can be constructed using any column material or H-section steel having a non-circular cross section.

The present invention has at least one of the following effects.
<1> By attaching a clamping device having a two-hinged structure to both ends of the transverse reinforcing member or longitudinal reinforcing member so that it can advance and retreat in advance, a stable posture can be traversed from the side of the supporting pile between adjacent supporting piles. A reinforcing material or a longitudinal reinforcing material can be suspended and installed.
<2> Welding on site because the clamping device can be held and fixed on the support pile simply by opening and closing and advancing and retracting the clamping device previously attached to both ends of the transverse reinforcement or longitudinal reinforcement. Work can be eliminated, and the pier substructure can be efficiently reinforced in a short period of time.
<3> By using the clamp device, it is possible to detachably connect the support pile and the transverse reinforcing member or the support pile and the longitudinal reinforcing member.
The removed clamping device can be used repeatedly.
<4> By mounting the clamp device at both ends of the transverse reinforcing member or the longitudinal reinforcing member so as to be able to advance and retreat, the construction error is absorbed and the gap between the supporting pile and the transverse reinforcing member or between the supporting pile and the longitudinal reinforcing member is reduced. You can connect between.
<5> Since the work of attaching and disassembling the clamp device can be easily performed, when underwater work is involved, the time of underwater work by the diver can be significantly reduced.
<6> The structure of the clamp device is simple, and the clamp device can be manufactured at low cost.

Explanatory drawing of pier substructure reinforcement method Arrow view seen from II-II in FIG. FIG. 2 is a perspective view of the clamp device according to the present invention. Top view of the holding part where the supporting device holds the clamp device 7A and 7B are explanatory views of a comparative example to which a clamp device having a one-hinge structure is applied, in which FIG. 7A is an explanatory view in which a reinforcing member is laterally moved and suspended, and FIG. Illustration Overall perspective view of the process of horizontally moving and suspending the transverse reinforcement between supporting piles Plane explanatory view of the process of laterally moving and suspending the transverse reinforcement between the support piles Overall perspective view of the process of laterally moving and suspending longitudinal reinforcement between supporting piles Plane explanatory view of the process of moving the longitudinal reinforcement horizontally between supporting piles and suspending it FIG. 9 is a perspective view of a semicircular clamp according to the second embodiment. FIG. 4 is a plan view of a clamp device according to a second embodiment using a pair of semicircular clamps. FIG. 10 is a perspective view of a semicircular clamp according to the third embodiment. FIG. 4 is a plan view of a clamp device according to a third embodiment using a pair of semicircular clamps. FIG. 14 is a perspective view of an auxiliary semicircular clamp according to the fourth embodiment. Fourth Embodiment A plan view of a clamp device according to a fourth embodiment in which an auxiliary semicircular clamp and a semicircular clamp are used together. FIG. 14 is a plan view of the expanded clamp device according to the fifth embodiment. 5 is a plan view of a clamp device according to a fifth embodiment held by a support pile. FIG. 14 is a plan view of an expanded clamp device according to a modification of the fifth embodiment. A plan view of a clamp device according to a modification of the fifth embodiment held by a support pile.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

[Example 1]
<1> Outline of Temporary Jetty The temporary jetty shown in FIGS. 1 and 2 will be described. The temporary jetty has a lower part 11 and an upper part 12.
The substructure 11 is composed of a plurality of support piles 20 erected at least on the ground G at intervals, a transverse reinforcing member 30 erected in a direction transverse to the bridge axis of the adjacent support pile 20, and a longitudinal direction of the bridge axis of the adjacent support pile 20. And a longitudinal reinforcing member 40 erected on the vehicle.
The support pile 20 is made of a steel pipe, an H-section steel, a column (box steel) alone, or a combination thereof. In this example, a form in which the support pile 20 is made of a steel pipe will be described.

The superstructure 12 includes a girder member 13 erected in the bridge axis transverse direction and the bridge axis longitudinal direction between the heads of the plurality of support piles 20, and a plurality of lining members 14 placed on the girder member 13.
The illustrated temporary pier 10 is an example, and is applicable to a known pier having a plurality of support piles 20.

In the present invention, a clamp device 50 having a common structure is previously attached to the end of each of the reinforcing members 30 and 40, and each of the reinforcing members 30 and 40 can be installed at a predetermined height of the support pile 20 via the clamp device 50. It is configured as follows.
Hereinafter, the construction materials used for the substructure 11 will be described.

<2> Clamping Device Referring to FIGS. 3 and 4, the clamping device 50 is a mechanical connector that can hold and release the support pile 20.
In this example, a case will be described in which the clamp device 50 is constituted by a single-peripheral clamp fitting 50A capable of holding one support pile 20 by itself.

<2.1> Full-circle clamp metal fitting 50A is a curved substrate 51 that can be externally mounted on the support pile 20, a gusset 52 protruding vertically at the center of the back surface 51a of the substrate 51, A pair of holding arms 54, 54 pivotally supported so as to be openable and closable horizontally via a pair of supporting shafts 53, 53 vertically arranged on the back side, and a tip of the pair of holding arms 54, 54. And a tightening means 55 such as a bolt for tightening the shaft, and has a symmetrical shape with respect to a center line passing through the middle between the pair of support shafts 53.

<2.1.1> Substrate The substrate 51 is a plate body that can cooperate with a pair of holding arms 54 and 54 to contact a part of the support pile 20 (a half circumference or less of the support pile). It is curved in accordance with the curvature of the steel pipe support pile 20.
Guide pieces 51c, 51c for restricting the holding arm 54 from moving vertically are projected from both left and right sides of the back surface 51a side of the substrate 51, between the pair of guide pieces 51c, 51c. Is formed with a slit 51d through which the base of each holding arm 54 can be inserted.
The pair of guide pieces 51c, 51c are not essential members and may be omitted.

<2.1.2> Gusset The gusset 52 is a connecting plate for connecting the entire circumference clamp fitting 50A to the end of each of the reinforcing members 30 and 40, and a plurality of mounting bolts is provided on the end of each of the reinforcing members 30 and 40. 56 are connected.
In this example, the support bracket 57 for pivotally supporting the holding arms 54 is shown as projecting from the substrate 51. However, the pair of support brackets 57 may be fixedly provided on both side surfaces of the gusset 52.

<2.1.3> Holding Arm A pair of holding arms 54, 54 are plate members having a total length capable of surrounding the entire circumference of the support pile 20, and in this example, match the curvature of the steel pipe support pile 20. Curved. The holding arm 54 alone has a total length capable of surrounding a half circumference of the support pile 20.
Reinforcing ribs 54a, 54b are attached to the back side of each holding arm 54.
The base end of the reinforcing rib 54a having a band shape curved in an arc shape along the holding arm 54 is pivotally supported by a support bracket 57 via a support shaft 53, and when the pair of holding arms 54, 54 is closed. The holding arms 54 are positioned on the extension of the substrate 51.
The distal end of each holding arm 54 is bent outward at a right angle, and a joint piece 54c is formed at the bent portion. A bolt hole 54d is formed in the joining piece 54c, and the pair of holding arms 54, 54 are brought into contact with each other via a fastening means 55 to fasten the pair of joining pieces 54c, 54c so that the outer peripheral surface of the support pile 20 is formed. Can be hugged.

<2.2> When the Clamping Apparatus Has One Hinge Structure For example, as shown in FIG. 5A, a structure in which the base ends of a pair of holding arms 54, 54 are pivotally supported by one common support shaft 53. It is also conceivable that this one-hinge structure allows the angle of spread θ of the pair of holding arms 54, 54 (the intersection of two straight lines connecting from the support shaft 53 to the tip of each holding arm 54, 54). Angle) is a narrow angle of 180 ° or less. Therefore, when the reinforcing member 30 (40) is moved in parallel to the support pile 20 in a horizontal direction, the hatched portion of the holding arm 54 collides with the support pile 20, and between the adjacent support piles 20. Can not be set.

<2.3> When Reinforcing Material is Connected to One Holding Arm Also, for example, as shown in FIG. 5 (B), in order to increase the spread angle θ of the pair of holding arms 54 having a one-hinge structure. A structure is also conceivable in which the end of the reinforcing member 30 (40) is connected to and attached to the back of one of the holding arms 54, but in this structure, the reinforcing member 30 (40) expands when it is hung by a hanging rope. The weight of the opened pair of holding arms 54, 54 becomes unbalanced, and the reinforcing member 30 (40) cannot be suspended while maintaining the verticality.

<2.4> Reason for Using Two-Hinged Structure for Clamping Device In the present invention, in order to solve the above two problems, two bases of a pair of holding arms 54, 54 are arranged at an interval. And a gusset 52 for connecting the end of the reinforcing member 30 (40) at a central position on the back side of the substrate 51.

  The two hinge structure is adopted because the angle of expansion of the pair of holding arms 54, 54 is increased so that the tips of the pair of holding arms 54, 54 do not collide with the support pile 20, and the adjacent support piles This is because it is possible to set from the side of 20.

The maximum spread angle of the pair of holding arms 54, 54 is an angle at which the ends of the pair of holding arms 54, 54 are located on the back side of the substrate 51 when the holding arms 54, 54 are fully opened. Good.
In short, when the pair of holding arms 54, 54 are pivoted in the expanding direction about the vertical support shafts 53, the ends are expanded until the distal ends of the holding arms 54 are located on the back side of the substrate 51. What is necessary is just to be comprised.

<2.5> Reason for Joining Gusset to Center of Board The reason why the gusset 52 was joined to the center position on the back side of the board 51 is that the pair of holding arms 54 and 54 are attached to the entire circumference of the clamp metal fitting 50A when the arms are expanded. This is to keep the weight balance even.

<2.6> Reason for All-Around Clamp Fitting to be Retractable The all-circumferential clamp fitting 50A is attached to the ends of the reinforcing members 30 and 40 so as to be able to slide horizontally.
In the present example, a form in which the elongated hole 52a which is a bolt hole is formed in the gusset 52 side in the horizontal direction is shown, but an elongated hole may be provided on the end side of each of the reinforcing members 30, 40.
The all-around clamp 50A is configured to be able to advance and retreat, so that the all-around clamp 50A does not collide with the support pile 20 when the reinforcing members 30 and 40 are set, and when the entire circumference clamp is fixed to the support pile 20. This is for adjusting the installation length of 50A according to the site.

  Hereinafter, the reason why the combination of pivotally supporting the pair of holding arms 54 and 54 with two hinges and attaching the entire circumference clamp metal 50A to the ends of the reinforcing members 30 and 40 so as to be able to move forward and backward will be described in detail. explain.

As another means for avoiding collision between the clamp with one hinge structure and the support pile 20 shown in FIG. 5A, one support shaft 53 having a common base end of the pair of holding arms 54, 54 is used. It is conceivable that the pivotally supported clamp is configured to be able to advance and retreat with respect to the reinforcing member 30 (40), and the clamp is retracted when the reinforcing member 30 (40) is suspended.
If the one-hinged clamp is configured to be able to advance and retreat, there is a problem that the entire length of the reinforcing member 30 (40) must be shortened, and stress concentrates on a connecting portion between the clamp and the reinforcing member 30 (40). The problem that it is easy occurs. Furthermore, the workability on site deteriorates because the length of advance and retreat of the clamp is long.

  In the present invention, in order to solve the above-mentioned problem that occurs when using a clamp with a single hinge structure, the pair of holding arms 54, 54 are pivotally supported by two hinges, and the end portions of the reinforcing members 30, 40 are provided. In this case, a combination in which the entire circumference of the clamp fitting 50A is attached so as to be able to move forward and backward is adopted.

<3> Transverse reinforcing material The transverse reinforcing material 30 is a reinforcing material installed in the direction crossing the bridge axis of the adjacent support pile 20.
The transverse reinforcing member 30 illustrated in FIG. 6 will be described. The transverse reinforcing member 30 includes a plurality of horizontal joints 31 arranged in parallel with each other and a brace member connected diagonally between the upper and lower horizontal joints 31. 32, and a mounting plate 33 disposed at the confluence of the ends of the horizontal joint members 31 and the ends of the brace members 32.
FIG. 6 shows an embodiment in which four horizontal joints 31 and three sets of brace members 32 are combined to form a unitized transverse reinforcing member 30, but upper and lower two horizontal joint members 31 and one set of brace members 32 are shown. May be combined to form a unit.
The transverse reinforcing member 30 is not limited to the illustrated form, and a known rigid structure beam can be applied.

  With reference to FIG. 3, the entire circumference clamp fitting 50 </ b> A has a gusset 52 butted against the mounting plate 33, the holding plate 34 is sandwiched from both sides, and a plurality of mounting bolts 56 are screwed into the both ends of the transverse reinforcing member 30. Attached to the part so that it can move forward and backward.

<4> Longitudinal reinforcing material The vertical reinforcing material 40 is a reinforcing material installed in the longitudinal direction of the bridge axis of the adjacent support pile 20.
The longitudinal reinforcing member 40 illustrated in FIG. 8 will be described. The longitudinal reinforcing member 40 includes a plurality of horizontal joints 41 disposed in parallel with each other, and a truss member 42 obliquely connected between upper and lower horizontal joints 41, 41. And a mounting plate disposed at an end of each horizontal joint 41.
The longitudinal reinforcing member 40 is not limited to the truss structure shown in the figure, and a known rigid structure beam can be applied.

  The full-circle clamp metal fittings 50A are attached to mounting plates provided at both ends of each horizontal joint 41 so as to be able to move forward and backward by the same connection structure shown in FIG.

[Reinforcement method of substructure of temporary pier]
Next, a method of reinforcing the substructure 11 of the temporary pier 10 will be described.

<1> Erecting Support Piles Referring to FIG. 1, a plurality of support piles 20 lifted by a crane are erected vertically on the ground G. When the ground is hard, a known drilling machine is inserted into the support pile 20 and driven into a predetermined depth while drilling.
A girder member 13 such as a receiving girder or a main girder is stretched and fixed between the pile heads of the plurality of support piles 20, and a plurality of lining members 14 are arranged on the upper surface of these girder members 13.
A crane (not shown) is installed on the lining material 14, and a plurality of support piles 20 are erected in front of the existing superstructure 12 along the bridge axis transverse direction.

<2> Installation of Transverse Reinforcement With reference to FIGS. 6 and 7, a process of installing the cross reinforcement 30 between the support piles 20 arranged in the bridge axis transverse direction will be described.

<2.1> Preparation for Suspension Before hanging, the above-described all-around clamp metal fitting 50A is attached to both ends of the transverse reinforcing member 30 in advance.
At this time, each of the circumferential clamps 50A has the pair of holding arms 54, 54 expanded, and the entire circumferential clamp 50A is traversed by the transverse reinforcing member 30 to a position where the circumferential clamp 50A does not collide with the support pile 20. Back inward.

<2.2> Suspension of cross reinforcements The cross reinforcement 30 is lifted by a crane or the like, and as shown by a two-dot chain line, the support piles 20 adjacent to each other are positioned from the side of the support piles 20. Translate in the horizontal direction (the longitudinal direction of the bridge axis) so that it is located between them.
During the suspending operation of the transverse reinforcing member 30, the center of gravity of each circumferential clamp member 50A is located on the center line of the transverse reinforcing member 30, so that the transverse reinforcing member is maintained in a stable posture while maintaining verticality and horizontality. 30 can be hung.
Since the circumferential clamps 50A at both ends of the transverse reinforcing member 30 are retracted, the circumferential clamps 50A do not collide with the adjacent support piles 20 and are located between the adjacent support piles 20. The transverse reinforcing member 30 can be hung in a short time.

<2.3> Clamping Operation by Clamping Device It is possible to fix both end portions of the transverse reinforcing member 30 between the adjacent support piles 20 by simply performing a simple clamping operation with the entire circumference clamping metal fitting 50A described below. it can.

<2.3.1> Advance operation of the clamp device Each of the peripheral clamps 50 </ b> A suspended along with the transverse reinforcing member 30 between the adjacent support piles 20, 20 is separated from each support pile 20.
Therefore, each of the full-circumferential clamps 50A is pulled out to bring the substrate 51 into contact with the peripheral surface of the support pile 20, and a plurality of mounting bolts 56 are tightened in this abutting state to move each of the full-circle clamps 50A forward and backward. Fix to impossible.
That is, when suspending the transverse reinforcing member 30 between the adjacent support piles 20, 20, each full-circle clamp metal fitting 50 </ b> A is retracted to shorten the protruding length of the transverse reinforcing member 30 from the end.
After the suspension, the entire circumference of the clamp fitting 50A can be advanced to freely adjust the overhang length of the entire circumference of the clamp fitting 50A, so that a construction error or the like of the support piles 20, 20 can be easily absorbed.

<2.3.2> Holding Operation by Holding Arm Next, a pair of holding arms 54, 54 are turned around the support shafts 53, 53 in a horizontal direction, and held on the peripheral surface of the support pile 20. Hold. The butted butting pieces 54c, 54c are fastened by the fastening means 55 to fix the entire circumference of the clamp fitting 50A to the support pile 20.

<3> Installation of longitudinal reinforcing members Referring to FIGS. 8 and 9, a description will be given of an erection process of installing the longitudinal reinforcing members 40 between the support piles 20 arranged in the bridge shaft longitudinal direction. The erection work is basically the same as the above-described erection work for the transverse reinforcing member 30 except that the hanging direction is different, but the other works are basically the same.

<3.1> Preparing for Suspension All-around clamp metal fitting 50A is attached to both ends of longitudinal reinforcing member 40 in advance.
At this time, the holding arms 54, 54 of each full-circle clamp metal fitting 50A are fully opened, and each full-circle clamp metal piece 50A is retracted inside the longitudinal reinforcing member 40.

<3.2> Suspension of longitudinal reinforcing members As shown by the two-dot chain line, the longitudinal reinforcing members 40 are lifted by a crane or the like, and are laterally positioned so as to be located between the supporting piles 20 adjacent to each other from the side of the supporting pile 20. Translate in the direction (cross-bridge direction).
At this time, a height difference (level difference) may be provided so that the entire circumferential clamps 50A provided at both ends of the longitudinal reinforcing member 40 do not interfere with the entire circumferential clamps 50A of the existing transverse reinforcing member 30. It is important.

<3.3> Clamping operation by the clamp device As in the case of the erection work of the transverse reinforcing member 30 described above, each of the circumferential clamps 50 </ b> A is moved outside the transverse reinforcing member 30 until the board 51 comes into contact with the peripheral surface of the support pile 20. Advance to the side and fix.
The pair of holding arms 54, 54 are pivoted about the support shaft 53 to be held on the peripheral surface of the support pile 20, and the joint pieces 54c, 54c are tightened to clamp the entire circumference of the clamp metal 50A to the support pile 20. Fixed to.
Since there is a difference in height between the full-circumferential clamp 50A provided on the longitudinal reinforcing member 40 and the full-circumferential clamp 50A provided on the existing transverse reinforcing member 30, the upper and lower full-circumferential clamps 50A interfere with each other. Never.

  Although not shown, it is also possible to extend and bridge the same type of reinforcing members 30 and 40 by providing a height difference in the entire circumference clamp fitting 50A.

<4> Repetition The above steps are repeated to construct the temporary pier 10.
At the time of construction, the transverse reinforcing member 30 and the longitudinal reinforcing member 40 can be hung horizontally from the side of the support pile 20, and furthermore, each circumferential clamp metal 50A provided at both ends of each reinforcing member 30, 40 is bolted. Since it can be fixed to the support pile 20 by a simple operation of just tightening, the substructure 11 can be constructed more efficiently than the conventional technique of fixing by field welding.
In particular, even when the work of holding the entire circumference of the clamp fitting 50A and fixing it to the support pile 20 is performed underwater, the work load of the diver can be reduced and the underwater work time can be significantly reduced.
If necessary, the mounting height and the mounting position of the entire-circumference clamp fitting 50A can be easily changed during the construction.

[Dismantling and removal of temporary pier]
When the temporary pier 10 is dismantled, the superstructure 12 and the substructure 11 are dismantled and removed by performing a reverse process of the assembly described above.
When the substructure 11 is dismantled and removed, the entire circumference of the clamp 50A can be separated from the support pile 20 by a simple operation, so that the entire circumference of the clamp 50A can be reused.

[Example 2]
Hereinafter, other embodiments of the clamp device 50 will be described. In the description, the same parts as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

  With reference to FIGS. 10 and 11, an embodiment in which the clamp device 50 is constituted by a pair of semi-circumferential clamps 50B having the same structure will be described.

<1> Half-circle clamp metal fitting The semi-circular clamp metal fitting 50 </ b> B includes a curved substrate 51 that can be provided on the support pile 20, a gusset 52 protruding vertically at the center of the back surface 51 a of the substrate 51, and a back surface of the substrate 51. A pair of holding arms 54, 54 pivotally supported so as to be openable and closable horizontally via a pair of vertically arranged support shafts 53, 53, and the tips of a pair of holding arms 54, 54 butted against each other. And two sets of tightening means 55 such as bolts for tightening.
In the half-circle clamp metal fitting 50B, the entire length of the holding arm 54 has a length capable of holding half the circumference of the support pile 20, and two sets of half-circle clamp metal fittings 50B, 50B are used as one set.
Therefore, in the clamp device 50 of the present example, a total of four holding arms 54 and four support shafts 53 are combined.

<2> Clamping Method Using Clamping Device In the second embodiment, semicircular clamps 50B are attached to both ends of each reinforcing member 30 and 40 in advance, and the semicircular clamps 50B are retracted and extended before and after hanging. Basic operations such as are the same as those in the first embodiment described above.
In this example, as shown in FIG. 11, the reinforcing members 30 and 40 equipped with the semicircular clamps 50 </ b> B in the expanded state are suspended from one of the left and right sides on one support pile 20, and the substrate 51 of the semicircular clamp 50 </ b> B is attached. Press against the support pile 20.
Next, the holding arms 54, 54 of each set of the half-peripheral clamp fittings 50B are held by the support pile 20 half-periphery.
Two sets of butting portions of the two holding arms 54, 54 where the joining pieces 54 c, 54 c are butted together are fastened by two sets of fastening means 55, respectively, to fix the completed clamp device 50 to the support pile 20. .

  In the second embodiment, not only the same operation and effect as those of the first embodiment described above can be obtained, but also the same type and the same shape of the semi-circumferential clamp fittings 50B, 50B are held from both left and right sides of one support pile 20. Thus, the clamp device 50 can be completed.

[Example 3]
In the first and second embodiments, the clamp device 50 corresponding to the steel pipe support pile 20 having a circular cross section has been described. However, the clamp apparatus 50 may be applied to the support pile 20 having a non-circular cross section.
Another clamping device 50 will be described with reference to FIGS.
In the present embodiment, an embodiment in which the clamp device 50 is constituted by a pair of semi-circumferential clamps 50C having the same structure will be described.

<1> Support Pile with Non-Circular Cross Section FIGS. 12 and 13 show a form in which a pair of semicircular clamps 50C, 50C having the same shape and structure are combined.
In this example, a case where the support pile 20 is a column material having a rectangular cross section will be described. However, the support pile 20 can be applied to an H-shaped steel.

<2> Clamping Device The semi-circumferential clamp fitting 50 </ b> C includes a flat board 51 that can be provided on one side (one side) of the support pile 20, and a gusset 52 protruded vertically in the center of the back surface 51 a of the board 51. A pair of linear holding arms 54, 54 pivotally supported so as to be openable and closable horizontally via a pair of support shafts 53, 53 vertically disposed on a support bracket 57 on the back side of the substrate 51; It is provided with two sets of tightening means 55 such as bolts for tightening the end portions of the pair of holding arms 54, butted against each other.

Compared with the second embodiment, the half-circle clamp metal fitting 50C of this embodiment has a structure in which the substrate 51 and the holding arms 54, 54 have a straight shape without being curved, and the pivot interval between the pair of support shafts 53, 53 is smaller. The difference is that the relationship is wider than the lateral width of the support pile 20.
Further, as compared with the second embodiment, the semi-circular clamp 50C of the present embodiment uses two semi-circular clamps 50B, 50B as a single set, and supports the entire length of the two holding arms 54, 54. Two sets of fastening means for having a length capable of holding half the circumference of the other one side (one side) of the stake 20 and for tightening the tips of the holding arms 54, 54 butt against each other. The use of 55 is the same as that of the second embodiment.

<3> Clamping Method Using Clamp Device FIG. 13 shows a form in which one support pile 20 is sandwiched and held by a pair of half-circumferential clamps 50C, 50C from both left and right sides.
The reinforcing member equipped with the half-circle clamp metal fitting 50C in the expanded state is hung between the adjacent support piles 20, and the substrate 51 of the half-circle clamp metal fitting 50C is pressed against the support pile 20, and then the holding of each set of the semi-circular clamp metal fittings 50C is carried out. The holding arms 54, 54 are held by the support pile 20 by half a circumference, and the butting portions of the two sets of holding arms 54, 54 where the joining pieces 54 c, 54 c abut against each other are tightened by two sets of tightening means 55. The fixing of the set of semicircular clamps 50C, 50C to the support pile 20 is the same as in the second embodiment described above.
The pair of opposing substrates 51, 51 and the two sets of holding arms 54 can be fixed by being clamped around the entire circumference of the support pile 20.

  In the third embodiment, not only the same operation and effect as those in the first and second embodiments described above can be obtained, but also the support pile 20 having a non-circular cross-sectional shape can be attached.

[Example 4]
Another clamping device 50 will be described with reference to FIGS.
In the present embodiment, a description will be given of a mode in which the clamp device 50 is configured by combining the above-described semicircular clamp metal fitting 50C and the auxiliary semicircular clamp metal fitting 50D.
<1> Support pile In this example, the case where the support pile 20 is H-shaped steel will be described. However, the support pile 20 can also be applied to a column material.
When the support pile 20 is an H-shaped steel, the recess space formed between the flange and the web is closed using a pair of filling materials 21 and 21.

<2> Clamping Device The half-peripheral clamp fitting 50C is as described in the third embodiment.

<3> Auxiliary semi-circumferential clamp hardware 50 A of auxiliary semi-circular clamp metal fittings are vertically disposed on a flat board 51 that can be provided on one side (one side) of the support pile 20 and a support bracket 57 on the back side of the board 51. The pair of linear holding arms 54, 54 pivotally supported so as to be openable and closable horizontally via the pair of support shafts 53, 53, and the butted ends of the pair of holding arms 54, 54 are tightened. And two sets of tightening means 55 such as bolts. The auxiliary semicircular clamp 50D has no gusset.

<4> Clamping Method Using Clamping Device FIG. 15 shows a form in which a single supporting pile 20 is sandwiched and held as a pair of a half-circumferential clamp 50C and an auxiliary semi-circular clamp 50D from both left and right sides thereof. I have.
The two half-circle clamps 50C, 50D in the expanded state are arranged on both left and right sides of the support pile 20, and each holding arm 54, 54 is held half-peripherally by the support pile 20, and two sets of holding arms 54, 54 are provided. The two butting portions where the joining pieces 54c and 54c are butted together are fastened by two sets of fastening means 55 to complete the clamp device 50.
The pair of opposing substrates 51, 51 and two sets of holding arms 54 can hold and fix the entire periphery of the support pile 20.

  In the fourth embodiment, not only the same operation and effect as those in the first and second embodiments described above can be obtained, but also the support pile 20 having a non-circular cross-sectional shape can be attached.

[Example 5]
With reference to FIGS. 16 and 17, another clamp device 50 that can be attached to the support pile 20 having a non-circular cross-sectional shape will be described.
In this example, a case will be described in which the clamp device 50 is constituted by a single-peripheral clamp metal fitting 50E capable of holding one support pile 20 by itself.

<1> All-around Clamp Fitting The all-around clamp fixture 50E is provided on one side surface (one side) of the support pile 20 so as to be in contact with a flat plate-shaped substrate 51, and is vertically oriented at the center of the back surface 51a of the substrate 51. A gusset 52 projecting therefrom, a pair of support shafts 53, 53 vertically disposed on a pair of support brackets 57, 57 on the back side of the substrate 51, and a horizontal direction via the pair of support shafts 53, 53. It comprises a pair of holding arms 54, 54 pivotally supported in an openable and closable manner and bent in an L-shape (hook shape), and fastening means 55, such as bolts, for fastening the tips of the pair of holding arms 54, 54. are doing.

<2> Holding Arm A pair of holding arms 54, 54 are plate members for surrounding and surrounding the entire periphery of the support pile 20 in cooperation, and each holding arm 54 surrounds a half circumference of the support pile 20. It has the full length possible and is bent in an L-shape (hook shape).
The base ends of the pair of holding arms 54, 54 are pivotally supported by a pair of support brackets 57, 57 via a pair of support shafts 53, 53.

<3> Clamping Method by Clamping Device FIG. 17 shows a form in which the entire circumference of the clamp 50E is set and held from the side of one support pile 20.
An expanded clamp metal fitting 50 </ b> E in the expanded state is arranged on the side of the support pile 20, and the pair of holding arms 54, 54 are rotated about the support shaft 53 to be held on the peripheral surface of the support pile 20. Then, the entire circumference of the clamp 50E is fixed to the support pile 20 by fastening between the joining pieces 54c, 54c by the fastening means 55.

  In the fifth embodiment, since the support pile 20 having a non-circular cross-sectional shape can be attached to the support pile 20 using one kind of full-circle clamp metal fitting 50E, the support shaft is compared with a form in which the two semi-circular clamp metal fittings described above are used in combination. The number of installations of 53 is reduced to half.

[Modification]
FIGS. 18 and 19 show a modification in which a pair of holding arms 54, 54 constituting the above-described full-circumference clamp fitting 50E are configured to be able to be bent in the middle.

<1> Clamping Bracket for All-Around Holding Arm In this example, each holding arm 54 is divided into a rear half 54e and a front half 54f by a bent portion, and the overlapped portion at the ends of both half 54e, 54f is an intermediate support shaft. At 53a, it is pivotally supported so that it can be folded in the middle.
The base of the rear half 54e of each holding arm 54 is pivotally supported by the support bracket 57 via the support shaft 53, and the joining pieces 54c formed at the front end of the front half 54f are abutted to each other via the fastening means 55. By tightening, the pair of holding arms 54 can be held and fixed to the support pile 20.

<2> Clamping Method Using Clamping Device The method of clamping to the support pile 20 by the all-around clamp metal fitting 50E in this example is the same as that in the above-described fifth example, and thus the description is omitted.

The operation and effect of this embodiment are the same as those of the fifth embodiment.
In this example, since the pair of holding arms 54, 54 constituting the entire circumference clamp fitting 50E can be bent in the middle, the work of winding the pair of holding arms 54, 54 around the support pile 20 becomes easy.

[Example 6]
Although the above description has been given of the form in which the same type of clamp devices 50, 50 are attached to both ends of the reinforcing members 30, 40, different types of clamp devices 50, 50 may be combined and attached.

For example, when the support pile 20 is made of a steel pipe, a full-circle clamp metal fitting 50A (FIG. 3) and a pair of half-circular clamp metal fittings 50B (FIG. 11) are combined at each end of each reinforcing member 30, 40. Attach.
For example, when the support pile 20 is a non-circular steel material (column material, H-section steel), a pair of semicircular clamps 50C (FIG. 13), a combination of the semicircular clamp 50C and the auxiliary semicircular clamp 50D (FIG. 13). 15) Alternatively, any one of the clamp devices 50 composed of the clamps 50E (see FIGS. 17 and 19) may be appropriately combined and attached to each end of each of the reinforcing members 30 and 40.

  In this example, the combination of the clamp devices 50, 50 can be properly used according to the cross-sectional shape of the support pile 20.

G ··· Ground 10 · · · · Erecting pier 11 · · · · · · Lower part of temporary pier 12 · · · · Upper part of temporary pier 13 · · · · Girder material 14 · · · ······························································································ ························································································· Clamping device 50A ···
50E · · · All-around clamp (column, for H-section steel)
50B ···· Semi-circumferential clamp (for steel pipe)
50C ··· Semi-circumferential clamp (column, for H-section steel)
50D ··· Auxiliary semicircular clamp (column, for H-section steel)
.., Substrate 51a, back surface 52 of substrate, gusset 52a, long holes 53, 53, pair of support shafts 54, 54, pair of holding arms 54a, ... Reinforcing rib 54b ... Reinforcing rib 54c ... Joint piece 54d ... Bolt hole 55 ... Tightening means 56 ... Mounting bolt

Claims (8)

Multiple support piles are erected along the bridge axis in front of the superstructure supported by multiple support piles, and cross reinforcements are erected between multiple adjacent support piles in the bridge axis cross direction. A method of reinforcing a temporary pier substructure in which a longitudinal reinforcing member is erected between a plurality of support piles adjacent to each other in the longitudinal direction of the bridge axis and reinforced,
A mechanical clamping device in which a pair of holding arms are pivotally supported on both ends of the transverse reinforcing member or the longitudinal reinforcing member so as to be openable and closable with a pair of support shafts spaced apart in advance,
With the pair of holding arms of the clamp device in an expanded state, suspended from the side of the support pile between adjacent support piles together with the transverse reinforcement or the longitudinal reinforcement,
The cross reinforcement or longitudinal reinforcement positioned between the adjacent support piles by holding and fixing the clamp device to each of the adjacent support piles,
Reinforcement method for temporary pier substructure.   The method for reinforcing a temporary pier substructure according to claim 1, wherein a plurality of clamp devices are held by the same support pile with a height difference.   3. The method for reinforcing a temporary pier substructure according to claim 2, wherein a height difference is provided between the clamping device for the transverse reinforcing member and the clamping device for the longitudinal reinforcing member, and the holding member is held by the same support pile. .   The clamping device is mounted so as to be able to advance and retreat in a horizontal direction with respect to the end of the transverse reinforcement or the longitudinal reinforcement, and the hanging device is used to suspend the transverse reinforcement or the longitudinal reinforcement before suspending the transverse reinforcement or the longitudinal reinforcement. 4. The installation length of the clamp device is adjustable by retracting inward and extending in the direction of extension of the reinforcement after the transverse reinforcement or the longitudinal reinforcement is suspended. The method for reinforcing a temporary pier substructure according to any one of the preceding claims.   The clamp device is composed of a single full-circle clamp, and the full-circle clamp is provided on a part of the peripheral surface of the terminal support pile, and is provided on a rear surface of the substrate, and is provided with a transverse reinforcing member or a longitudinal reinforcing member. A gusset connected to an end of the material by a bolt so as to be able to move forward and backward, and pivotally supported so as to be able to open and close horizontally through a pair of support shafts vertically disposed on a mounting bracket on the back side of the substrate, A pair of holding arms having a length capable of being externally mounted on the support pile, and a fastening means for tightening the distal ends of the pair of holding arms, the support pile including the substrate of the clamp device and the pair of holding arms. The method for reinforcing a temporary pier substructure according to any one of claims 1 to 4, wherein the temporary pier substructure is fixed by being held around the entire periphery from the side of the pier.   The clamp device is composed of a combination of a pair of semicircular clamps, and each of the semicircular clamps is provided on a substrate that can be externally mounted on a part of the support pile, and protrudingly provided on the back of the substrate. A gusset that is connected to the end portion by a bolt so as to be able to move forward and backward, and a support pile that is pivotally supported to be horizontally openable and closable via a pair of support shafts vertically disposed on a mounting bracket on the back side of the substrate; A pair of holding arms having a length capable of covering a half of the arm, and fastening means for tightening the distal ends of the pair of holding arms, and a substrate and a pair of holding arms of the pair of half-circle clamps. The method for reinforcing a temporary pier substructure according to any one of claims 1 to 4, wherein the support pile is held and fixed from both sides of the support pile around the entire circumference. The clamp device comprises a combination of a semi-circumferential clamp and an auxiliary semi-circular clamp,
A board on which the semi-circumferential clamp is externally provided on a part of a support pile, a gusset protruding from a back surface of the board, and connected to an end of a transverse reinforcing member or a longitudinal reinforcing member by a bolt so as to be movable forward and backward; A pair of holding arms that are pivotally supported so as to be openable and closable horizontally through a pair of support shafts vertically disposed on the mounting bracket on the back side, and have a length capable of covering a half circumference of the support pile; , A tightening means for tightening the tips of the pair of holding arms,
The auxiliary semi-circumferential clamp is pivotally supported so as to be horizontally openable and closable via a pair of support shafts vertically disposed on a mounting bracket on the back side of the substrate, and a substrate that can be mounted on a part of the support pile. Is provided, a pair of holding arms having a length capable of covering the half circumference of the support pile, and a fastening means for tightening the tip of the pair of holding arms,
5. The substrate according to claim 1, wherein the base plate and the pair of holding arms of the semi-circumferential clamp, the auxiliary semi-circular clamp, and the pair of holding arms are held around the entire circumference from both sides of the support pile and fixed. How to reinforce the temporary pier substructure described.   The method according to any one of claims 1 to 7, wherein the support pile is any one of a steel pipe, a column material, and an H-section steel.

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