JP4402563B2 - Bridge construction method - Google Patents

Description

  The present invention relates to a bridge that can be easily constructed and can be used for a long period of time, and a method for constructing the bridge.

  In Japan, when carrying out civil engineering work on steep mountain estuaries where roads are not well-developed and rivers with large changes in water volume, it is indispensable to secure a delivery route for construction machinery as ancillary work for pretreatment. In general, full-fledged civil engineering work is carried out after securing a carry-in route by temporary pier construction or the like.

  Since the construction of the temporary pier is carried out as an auxiliary work prior to the construction, it is required to be constructed in a short period of time and with low labor. In order to meet such a demand, for example, a construction method of a temporary pier as disclosed in Patent Document 1 has been proposed.

Japanese Patent Laid-Open No. 10-46523

Since the conventional temporary jetty is intended to function as a loading path during the main construction, as described above, it is required to be constructed in a short period of time and with low labor, and its durability is not so required. Therefore, such a temporary pier cannot be used as a permanent bridge for a long period of time after the completion of this construction, and was removed after the completion of this construction.
Therefore, labor for removing temporary piers and waste materials after removal are generated, which not only reduces the efficiency of construction work, but also causes the problem of environmental impact caused by dumping of waste materials. It was.
Furthermore, if the construction plan is changed due to economic circumstances, etc., and the bridge constructed as a temporary pier must be used as a permanent bridge after the completion of this construction, the conventional temporary pier cannot be used. there were.

The present invention has been made in view of the above-described conventional situation, and even a bridge constructed as a temporary pier in the pretreatment incidental work of the present work can be used as a permanent bridge after the completion of the present work. The purpose is to provide a bridge construction method .

The invention according to claim 1 is provided at a predetermined height position between a column erecting step of erecting a plurality of columns on the ground, a panel arrangement step of arranging a panel material on the upper side of the column, and the adjacent columns. A column connecting step for arranging the beam, and the column installed in the column erecting step is welded or bolted to a cylindrical connecting body for externally fitting the column. In the process, a bridge construction method is characterized in that a plurality of connecting members having a predetermined length, which are provided in the beam and arranged in parallel with each other at an interval in the vertical direction, are connected to the cylindrical connector.

According to the first aspect of the present invention, it is possible to construct a simple bridge having a high lower structural strength simply by connecting a beam lowered to a predetermined position to a cylindrical connection body welded or bolted to a support column. .

Hereinafter, an embodiment and a reference embodiment of a bridge constructed by the bridge construction method according to the present invention (hereinafter sometimes referred to as a simple bridge) will be described with reference to the drawings. FIG. 1 is a schematic external view of a bridge constructed by the bridge construction method according to the present invention as viewed from the side. 2 is a cross-sectional view taken along line AA in FIG.
The bridge (1) constructed by the bridge construction method according to the present invention includes a plurality of support columns (2), a flat panel material (3) disposed at the upper end of the support columns (2), and an adjacent support column (2). It consists of the beam (4) arrange | positioned between.

As shown in FIG. 1, a plurality of support columns (2) are erected in alignment on the slope going down to the left. The lower part of the column (2) is buried in the ground, and the lower end of the column (2) reaches a predetermined depth in the ground support layer (S). The upper part of the column (2) protrudes from the ground surface (G) and supports the panel material (3) at the upper end part.
As shown in FIG. 2, the column (2) is also aligned in the width direction of the simple bridge (1).

The panel material (3) consists of a receiving girder (31), a main girder (32) and a lining plate (33). The receiving girder (31) is fitted to the upper end of the column (2). The main beam (32) is disposed on the upper surface of the receiving beam (31) and joined to the receiving beam (31). The lining plate (33) is disposed on the upper surface of the main beam (32) and is connected to the main beam (32).
An upper structure can be appropriately constructed on the lining plate (33). In addition, in the example shown in FIG. 2, the handrail structure (5) is shown.

  The beam (4) is disposed between the columns (2) whose exposed length from the ground surface (G) is a predetermined length or more. By disposing the beam (4), deformation of the column (2) such as buckling or bending is prevented. As shown in FIGS. 1 and 2, the beam (4) is disposed between the support (2) in the longitudinal direction (see FIG. 1) and the simple bridge (1) in the width direction (see FIG. 2). Yes.

FIG. 3 is a detailed view showing an embodiment of the beam (4). FIG. 3A is a view of the beam (4) as viewed from above, and FIG. 3 (b) is a view of the beam (4) as viewed from the front.
The beam (4) shown in FIG. 3 includes a plurality of connecting members (41) having a predetermined length and arranged in parallel with each other at an interval in the vertical direction. Between the two connecting members (41) adjacent to each other in the vertical direction, the upper connecting member (41) from the right end to the lower connecting member (41) left end, and the upper connecting member (41) from the left end A brace material (42) formed by crossing members toward the right end of the lower connecting material (41) is disposed.
Fixing plates (43) are disposed at both ends of the connecting material (4). A through hole (431) is formed in the fixing plate (43), and each end of the connecting material (4) and the brace material (42) is fixed with a bolt through the through hole (431). 4) and the brace material (42) are fixed respectively.
The beam (4) is preferably assembled in advance at a factory or the like. Thereby, while being able to reduce the work man-hour at the construction site of a simple bridge, it becomes possible to form the beam (4) with high accuracy.

FIG. 4 is a view showing a cylindrical connecting body connected to the beam (4) shown in FIG. 4A is a plan view, FIG. 4B is a front view, and FIG. 4C is a view in the B direction.
The tubular connector (6) includes a tubular portion (61), an extending portion (62) extending from the outer peripheral surface of the tubular portion (61), and the tubular portion (61) and the extending portion (62). It is comprised from the flat flange (63) each arrange | positioned up and down so that it may be pinched | interposed.
The shape of the cylindrical part (61) is formed in accordance with the cross-sectional shape of the column (2). For example, when the cross-sectional shape of the column (2) is a circle (for example, a steel pipe), it can be a cylinder as shown in FIG. Alternatively, when the cross-sectional shape of the column (2) is H-shaped (for example, H-shaped steel), it can be a rectangular tube.
The cylindrical portion (61) has a split structure and is divided into two so that a dividing line enters in the axial direction. On the dividing surface, the joining plate (64) extends outward from the outer peripheral surface of the cylindrical portion (61). By joining the joining plates (64) together and inserting and fixing bolts into the through holes (641) formed in the joining plate (64), the split-structure tubular portion (61) is united. The dividing position is not particularly limited, and as shown in FIG. 4, the dividing position may be divided into two at a position of 45 ° with respect to the extending direction of the extending portion (62). You may divide into two along the extension direction of a part (62) (at the position which shifted | deviated 45 degrees from the position of illustration).

The extension part (62) is a plate-like member having a height substantially equal to the height of the cylindrical part (61). Four extending portions (62) are provided at right angles to the outer peripheral surface of the cylindrical portion (61) and at 90 ° intervals in the circumferential direction. In addition, the number and the extending direction of the extending part (62) are appropriately determined depending on the number of the beams (4) connected to the cylindrical connecting body (6) and the mounting direction.
The extension part (62) is initially in a state without a hole, and a circular hole (621) may be formed as shown by a broken line in FIG. May be.

FIG. 5 is a view showing a state in which the beam (4) shown in FIG. 3 is connected between the columns (2) by the cylindrical connector (6) shown in FIG. Fig.5 (a) is sectional drawing seen from upper direction, FIG.5 (b) is a front view.
As shown in FIG. 5 (b), the beam (4) is arranged between adjacent columns (2). The cylindrical connector (6) is fitted around the support (2).
The extension part (62) of the cylindrical connecting body (6) is joined to the fixing plate (43) of the beam (4) with a bolt.
The cylindrical part (61) and the column (2) of the cylindrical connection body (6) are fixed by welding. By welding the cylindrical portion (61) to the support column (2), the cylindrical portion (61) is permanently fixed, and the strength of the lower structure of the simple bridge (1) is reduced over time. Almost does not occur. Alternatively, for example, a long hole may be formed in the cylindrical portion (61), a screw hole may be provided on the circumferential surface of the support column (2), and the cylindrical portion (61) and the support column (2) may be fixed with bolts. . In addition to clamping the tubular portion (61) having the split structure to the support (2), the tubular portion (61) is fixed to the support (2) by bolts, so that the tubular portion (61) is permanently attached. Therefore, the strength of the lower structure of the simple bridge (1) is hardly lowered over time.
Further, a through hole (631) is formed in the flange (63), and the cylindrical connector (6) can be connected and fixed up and down using the through hole (631).

FIG. 6 is a flowchart showing a method for constructing the simple bridge (1) shown in FIGS. 1 and 2, and FIGS. 7 to 10 show one step of the method for constructing the simple bridge (1).
The simple bridge (1) construction method of the present invention includes a column erecting step, a panel material arranging step, and a beam arranging step.
In the column erecting step, the column (2) is erected. The support (2) is embedded so that the lower end of the support (2) reaches a predetermined depth on the ground support layer (S).
In the panel material arranging step, the panel material (3) is arranged on the support (2). The crane (C) is installed on the panel material (3 (3a)). As shown in FIG. 7, the next panel (3b) is suspended by the crane (C) and arranged on the existing panel. Both panels (3a, 3b) are connected by W).
Then, as shown in FIG. 8, using the crane (C), the table machine (T) was installed on the panel material (3b) and the ground was drilled. Then, as shown in FIG. A pillar (2c) is driven into the hole to fix the stigma and the panel material (3b).
The cylindrical connecting body (6) is connected to the support columns (2a to 2c) erected as described above at predetermined intervals in the height direction (interval between the connecting members (41) of the beams (4)) on the outer peripheral surface thereof. Is done. This fixing may be performed after the column (2) is erected, or the column (2) to which the cylindrical connector (6) is previously fixed may be erected on the ground.
For example, if the tubular connector (6) is fixed to the support (2) in advance by welding in a factory, it is not on-site welding, so that reliable welding can be guaranteed and a simple bridge constructed ( It is possible to reliably prevent the decrease in strength of 1).
If the elongated portion extending in the axial direction of the tubular portion (61) of the tubular connecting body (6) is formed in the tubular portion (61), and the screw hole is formed in the peripheral surface of the strut (2), the elongated hole becomes the strut. The driving error (2) can be absorbed and the height position of the cylindrical connector (6) can be finely adjusted. After optimizing the height position of the cylindrical connector (6), the simple bridge (1) that is also constructed by connecting the column (2) and the cylindrical connector (6) through the elongated hole ) Can be prevented from decreasing in strength.

Next, in the beam arranging step, as shown in FIG. 10, the beam (4) is suspended by the crane (C) so that the connecting material (41) and the support columns (2b, 2c) are in a perpendicular direction, and adjacent to each other. The fixed plate (43) and the extending portion (62) are overlapped with each other by being lowered to a predetermined height position between the columns (2b, 2c). Here, it is preferable that the extended portion (62) has a large area so as to absorb errors in the driving position of the column (2).
Further, when a guide member (L) having a U-shaped cross section as shown in FIG. 10 is interposed between the hook of the crane (C) and the beam (4), a panel is formed at the opening of the guide member (L). It is preferable to insert (3) because the beam (4) can be positioned easily and reliably.

  In a state where the fixing plate (43) and the extending portion (62) are overlapped, both are temporarily fixed with a vise and the like, and a bolt is inserted into the through hole (431) provided in the fixing plate (43). The fixing plate (43) and the extension part (62) are fixed by bolting. At this time, if there is no hole in the extension part (52), drill a hole using a drill, punch, gas, etc. at the construction site of the simple bridge, and match this hole with the through hole (431). What is necessary is just to insert a volt | bolt, and when an elongated hole is provided in the extension part (52), what is necessary is just to insert this volt | bolt combining this elongate hole and a through-hole (43). This operation can be performed, for example, on a gondola suspended from above.

Thus, while using the beam (4) in which the connecting material (41) and the brace material (42) are integrally formed in advance, the cylindrical connecting body (6) provided with the extending portion (62) in advance is used as the support column. Fixing to (2) by welding or bolting at a predetermined height interval, and fixing portions (43) provided at both left and right ends of the beam (4) are extended to the extending portion (62) of the cylindrical connector (6). By adopting the fixing method, it is possible to fix the beam (4) to the column (2) with extremely good workability, and it is possible to construct a simple bridge (1) having high structural strength over a long period of time. It becomes.
In this way, a plurality of support columns (2) are erected in sequence, a panel (3) is sequentially installed on the erected column (2), and the beam (4) is fixed between the columns. By repeating sequentially, a simple bridge (1) as shown in FIG. 1 can be constructed.

The first reference embodiment of the present invention is shown below. The simple bridge (1) of the first reference mode is the same as the other configuration except that the structure of the beam (4) is different from the beam (4) of the simple bridge (1) of the above embodiment .
FIG. 11 is a front view of the beam (4) constituting the simple bridge (1) of the first reference embodiment , and FIG. 12 is a top view thereof.
A plurality of beams (4 in the example shown in FIGS. 11 and 12) are arranged in parallel with each other at an interval in the vertical direction and extend and contract in the length direction. ) And a brace material (42) that connects the two connecting materials (41) adjacent to each other and connects these connecting materials (41).

The connecting material (41) can be expanded and contracted in the length direction, and is configured to be able to maintain its length in an extended state. 11 and 12 show an example in which the connecting member (41) is configured by a hydraulic cylinder. The oil used for the hydraulic cylinder (41) can be supplied from the tube (411), and the hydraulic cylinder (41) can be expanded and contracted by the hydraulic pressure of the oil supplied from the tube (411). .
11 and 12 show three connecting members (41), but two or four or more connecting members (41) may be used, and the number of connecting members (41) can be appropriately set according to the length of the support column (2). .

At both ends of the connecting material (41), mounting members (44) matching the side surface shape of the support (2) are disposed.
The shape of the attachment member (44) is not particularly limited, and is appropriately determined according to the shape of the support column (2). For example, when the column (2) is made of a steel pipe, the attachment member (44) can be formed in an arcuate curved plate as shown in FIG.
Further, when the attachment member (44) is made detachable from the connecting member (41), the attachment member (44) can be changed according to the shape of the column (2) to which the beam (4) is applied. 4) The versatility of itself increases.

The brace material (42) is between two adjacent connecting materials (41), one end of one connecting material (41), the other end of the other connecting material (41), and the other connecting material. One end of (41) and the other end of one connecting member (41) are connected to each other so as to be connected.
The two intersecting brace materials (42) are not joined to each other, and the intersecting angle changes with expansion and contraction of the connecting material (41).

FIG. 13 is a view showing a state before and after the extension of the beam (4) according to the first reference embodiment . As shown in FIG. 13, when the length of the connecting member (41) is extended, two crossed braces The crossing angle of the material (42) changes so as to be close to a right angle, whereby the entire beam (4) extends in the length direction, and at the same time, the interval between the connecting materials (41) is reduced.

FIG. 14 is a front view showing a state in which the beam (4) according to the first embodiment is attached between the columns (2), and FIG. 15 is a top view thereof.
As shown in FIGS. 14 and 15, the beam (4) according to the first reference form is adjacent to each other by extending the connecting member (41) and bringing the attachment member (44) into close contact with the circumferential surface of the column (2). It is installed so as to connect the two struts (2) that fit.
After the installation, the mounting member (44) and the column (2) are welded, and the beam (4) is fixed to the column (2). Or you may fix a beam (4) to a support | pillar (2) using the screw hole formed in the support | pillar (2) through the through-hole formed in the attachment member (44).
When the beam (4) is fixed to the column (2) by welding or bolting the mounting member (44) in this way, the structural strength of the simple bridge (1) is prevented from decreasing over time, and the simple bridge ( 1) can be used as a permanent bridge.

The method for constructing the simple bridge (1) using the beam (4) according to the first reference mode is the same as the other steps except for the beam arrangement process described in the above embodiment .
After the panel installation process, the beam (4) is suspended by the crane (C) so that the connecting material (41) and the support (2) are perpendicular to each other. It is lowered to the height position.
After lowering the beam (4) to a predetermined height position, the connecting member (41) is extended, and the attachment members (44) provided at both ends of the connecting member (41) are attached to the peripheral surface of the support column (2). Adhere closely. And the attachment member (44) and the support | pillar (2) are joined by welding or a bolt stop.
In the first reference embodiment , since the connecting member (41) is composed of a cylinder, an error in the distance between the supports can be absorbed in the extension range of the cylinder rod.

16 and 17 show the structure of the beam (4) used in the simple bridge (1) of the second reference form . FIG. 16 is a front view of a beam (4) used in the simplified bridge (1) of the second reference form , and FIG. The simple bridge (1) of the second reference form is different only in the structure of the connecting member (41) of the beam (4) according to the first reference form , and the other structures are the same.

The connecting member (41) of the beam (4) used for the simple bridge (1) of the second reference form is configured as follows.
Eight unit members (a), (b), (c), (d), (e), (f), (g), and (h) having a U-shaped cross section are combined in an octagonal shape, and adjacent unit members are rotated by pins. An eight-joint link is formed by connecting them, and screw holes are formed on the upper surface of the upper unit member (a) and the lower surface of the lower unit member (e) constituting the link. The screw (412) is inserted so as to be screwed onto the screw, and the gear (413) is attached to the screw (412).
Then, a U-shaped gap holding member (414) is fixed to the screw (412) so as to connect the upper part of the gear (413) and the lower part of the lower unit member (e), and the gap holding member (414) and the gear. Spacers (415 (415a, 415b)) are interposed between the upper surface of (413) and between the lower surface of the spacing member (414) and the unit member (e), respectively, and the gear (413) and the unit member (e ) To be constant.

Further, connecting members (416, 417) extend from the right surface of the right unit member (c) to the right and from the left surface of the left unit member (g) to the left, respectively, and these connecting members (416, 417). Attach the mounting member (4) to the tip in the extending direction.
A rotatable operation rod (418) is provided in parallel with the screw (412), and a gear (419) that meshes with the gear (413) is attached to the operation rod (418).
For convenience of drawing, the operating rod (418) is drawn on the right side of the screw (412), but is actually provided in front of the screw (412). The spacing member (414) is provided behind the unit member so that the opening faces forward. Further, the operation rod (418) is held at a predetermined position by a method such as coupling with the interval holding member (414).

When the gear (419) is rotated together with the operation rod (418) in the connecting member (41) having the above structure, the gear (413) meshing with the gear (419) is rotated, and accordingly, the gear (413) and The secured screw (412) rotates.
At this time, since the distance between the gear (413) and the unit member (e) is made constant by the spacing member (414), the screw (412) is screwed together by the rotation of the screw (412). The interval between the unit members (a) and (e) is enlarged (reduced), and accordingly, the interval between the unit members (c) and (g) connected to the unit members (a) and (e) to form a link mechanism. Shrinks (enlarges).

FIG. 17 shows a state in which the interval between the unit members (c) and (g) is reduced by the rotation of the operation rod (418), and when the interval between the unit members (c) and (g) is reduced in this way. The connecting members (416, 417) joined to the unit members (c) (g) are pulled inward toward the screw (412), whereby the connecting material (41) is reduced in the length direction, The space | interval of an attachment member (44) narrows.
When extending the connecting material (41) in the length direction, the operation rod (418) may be rotated in the reverse direction.

The construction method of the simple bridge (1) of the second reference form is the same except for the process of extending the beam (4) of the first reference form .
That is, instead of operating the hydraulic cylinder of the beam (4) according to the first reference form , the mounting member (44) is supported by the rotation of the operation rod (418) of the beam (4) according to the second reference form. Adhering to (2), the attachment member (4) is fixed to the peripheral surface of the support (2) by means of welding or bolting. Thereby, it is possible to obtain the same structural strength as in the first reference embodiment .

The structure of the beam (4) used for the simple bridge (1) of the 3rd reference form is shown in FIG. 18 thru | or FIG. FIG. 18 is a front view of the beam (4) used in the simple bridge (1) of the third reference embodiment , and shows a state in which the connecting material (41) of the beam (4) is straightened. FIG. 19 is a view showing a state in which the connecting member (41) of the beam (4) shown in FIG. 18 is bent. 20 is a view of the beam (4) shown in FIG. 18 as viewed from above, and FIG. 21 is a view of the beam (4) as shown in FIG. 19 as viewed from above.
The simple bridge (1) of the third reference mode is the same as the other configuration except that the structure of the beam (4) is different from the beam (4) of the simple bridge (1) of the above embodiment .

The beams (4) used in the simple bridge (1) of the third reference form are parallel to each other, each extending in a substantially horizontal direction and arranged in parallel in the vertical direction, Between two adjacent connecting members (41), one end of one connecting member (41), the other end of the other connecting member (41), and one end of the other connecting member (41) It consists of a brace material (42) provided crossing without joining each other so that the other end part of one joining material (41) may be connected, respectively.
The number of the connecting members (41) is not particularly limited, and may be two, three, four or more, for example, and the number can be appropriately set according to the length of the support (2). It is.

At both ends of the connecting material (41), attachment members (44) that match the side surface shape of the support column (2) are provided.
The shape of the mounting member (44) is not particularly limited, and can be appropriately changed according to the shape of the peripheral surface of the support (2). For example, when the support is made of a steel pipe, an arcuate curved plate What is necessary is just to form.
If the attachment member (44) can be attached to and detached from the connecting member (41), the attachment member (44) can be changed according to the shape of the peripheral surface of the support column (2), and versatility is improved.

Each connecting member (41) can be bent upward in a reverse V shape from a straight state at the midway portion. Thereby, the beam (4) can be expanded and contracted in the length direction.
In the example shown in FIGS. 18 to 21, the connecting member (41) is provided with a hinge portion (71) at the center thereof. This hinge part (71) can rotate the right side member (72) which comprises the right half of the connecting material (41) and the left side member (73) which constitutes the left half of the connecting material (41). It is a pin joint to be connected. The right member (72) and the left member (73) are each provided with a bottom plate (70) or a flange (not shown) at the end portions facing each other. The lower end portions of the bottom plate (70) or the lower end portions of the flange are pin-joined so as to be rotatable. When the bottom plates (70) or the flanges face each other and contact in front of each other, the connecting material (41) becomes a straight line extending straight. The right side member (72) and the left side member (73) rotate around the hinge portion (71), and the connecting member (41) can be bent upward in an inverted V shape (see FIG. 19). The connecting material (41) is V-shaped, that is, does not bend downward.
In the illustrated example, the left side member (73) includes a cylindrical body (74) described later and a length adjusting mechanism (80) provided at the outer end of the cylindrical body (74), and the right side member (72). ) Has a cylindrical body (74). Contrary to the illustrated example, the right side member (72) includes a cylindrical body (74) and a length adjusting mechanism (80) provided at the outer end of the cylindrical body (74), and the left side member ( 73) may be provided with a cylindrical body (74). Moreover, both the left side member (73) and the right side member (72) may be provided with a length adjusting mechanism (80).

Both ends of the connecting material (41) and the vicinity of the hinge (70) (bendable point) are configured to be hung by a wire (75). For example, wire locking holes (751) are provided at these positions. It should be noted that only the uppermost connecting member (41) is required to suspend both ends of the connecting member (41) with the wire (75). The wire (75) that hangs the vicinity of the hinge portion (71) (bendable point) and the wire (75) that suspends both ends of the connecting member (41) can be moved up and down individually. In this case, the connecting material (41) is suspended in a bent state, and when it is lowered to a predetermined height, only the wire (75) in the vicinity of the hinge portion (71) is further lowered, so that the connecting material (41) is straightened by its own weight. extend.
If the length of the connecting member (41) in a straight state is matched with the distance between the opposing surfaces of the adjacent struts (2), the beam (75) can be Both ends of 4) are brought into contact with the support column (2), and the beam (4) can be arranged at a predetermined height.

The beam (4) is preferably configured so that its length can be adjusted. In this embodiment, the connecting member (41) includes a length adjusting mechanism (80).
As an example of the length adjusting mechanism (80), a male screw member (81) extending in the length direction of the connecting member (41), a female screw member (82) screwed with the male screw member (81), and the female screw member And a female screw rotating means (83) for rotating (82) to move the female screw member (82) forward and backward on the male screw member (81).
In this case, the position of the female screw member (82) is changed on the male screw member (81) by rotating the female screw member (82).

The configuration of the female screw rotating means (83) is not particularly limited. For example, the female screw rotating means (83) is opposite to the extension side adjusting wire (84) wound around the peripheral surface of the female screw member (82) and pulling one end side. Examples thereof include a shortening side adjusting wire (85) which is wound and pulls one end side.
According to this configuration, after the beam (4) is hung down to a predetermined height and extended, the extension side adjusting wire (84) or the shortening side adjusting wire is used when the beam (4) is too long or too short. The length of the beam (4) can be adjusted by pulling the wire (85) from above and rotating the female screw member (82). It is also possible to adjust the length of the beam (4) by rotating the female screw member (82) in advance before hanging down.

The mounting member (44) is preferably provided with a clamp mechanism (90) for gripping the peripheral surface of the support (2). By providing the clamp mechanism (90), the beam (4) can be reliably positioned with respect to the support (2). In addition, this clamp mechanism (90) is employable also for the beam (4) of the simple bridge (1) which concerns on the 1st and 2nd reference form .

Although the structure of a clamp mechanism (90) is not specifically limited, For example, the following structures are employable.
An attachment member (44) and a clamp mechanism (90) are disposed on the right end of the right member (72) and the left end of the left member (73), respectively.
The clamp mechanism (90) includes an arm member (91) that can swing around one end to suppress the peripheral surface of the support (2), and a swing mechanism (92) for swinging the arm member (91). Consists of.

The configuration of the swing mechanism (92) is not particularly limited, and for example, a structure as shown in FIGS. 20 and 21 can be adopted.
The swing mechanism (92) shown in FIGS. 20 and 21 has a base end portion (921) formed on the back surface of the mounting member (44) and a cylinder outer cylinder end portion rotatably attached to the base end portion. The rod end is rotatably connected to the end of the arm portion (91). According to the swing mechanism (92), when the rod of the cylinder (922) is extended, the arm portion (91) is closed (see FIG. 20), and when the rod of the cylinder (922) is accommodated in the cylinder outer cylinder, the arm portion. (91) opens. In this way, the clamp mechanism (90) securely holds the support column (2).

  It is also possible to employ another swing mechanism (92). 22 to 24 show another form of the swing mechanism (92). FIG. 22 is a perspective front view of the beam (4) employing another swing mechanism (92), and shows a state in which the beam (4) is extended. FIG. 23 shows a state in which the beam (4) shown in FIG. 22 is closed. FIG. 24 is an enlarged view of the vicinity of the bottom plate (70) of the left member (73) or the right member (72). FIG. 24A shows a state in which the connecting material (41) of the beam (4) is bent, and FIG. 24 (b) shows a state in which the connecting material (41) of the beam (4) is straightened.

The swing mechanism (92) shown in FIGS. 22 to 24 is provided in the right side member (72) and the left side member (73) (in the illustrated example, in the cylindrical body (74)), and the front end is the right side member. (72) and a bar member (702) biased toward the opposite left member (73) or right member (72) which can be projected and retracted from the through hole (701) of the bottom plate (70) of the left member (73). And a link mechanism (1000) having one end connected to the rear end of the bar (702) and the other end connected to the arm member (91).
The biasing force can be applied by a spring (for example, a compression coil spring) (703). In the example shown in FIGS. 22 to 24, the end (front end) of the spring (703) on the bottom plate (70) side is fixed to the bar (702). The end (rear end) of the spring (703) is positioned by a stopper (704) disposed on the inner peripheral surface of the cylindrical body (74).
The rod member (702) has an opposite cylindrical shape as the inner angle (α) (see FIG. 23) formed by the right member (72) approaches 180 ° (see FIG. 22) and the distance between the bottom plates (70) becomes narrower. Pushed by the bottom plate (70) of the body (74) to move the arm member (91) in the closing direction via the link mechanism (1000), conversely, the internal angle (α) formed by the two cylindrical bodies (74) is 180. As the distance between the bottom plates (70) increases from 0 ° (see FIG. 22), the arm member (91) is moved in the opening direction via the link mechanism (1000) by the biasing force.

According to this configuration, as the connecting material (41) extends straight from the bent state, the arm member (91) moves in the closing direction. And a clamp mechanism (90) will grasp a support | pillar (2) reliably.
The configuration of the breath material (42) is the same as that shown in the first or second reference embodiment .

The method of constructing the simple bridge (1) using the beam (4) according to the third reference mode is the same as the other steps except for the beam arrangement process described in the above embodiment .
After the panel installation process, the beam (4) is suspended by the crane (C) so that the connecting material (41) and the support (2) are perpendicular to each other. It is lowered to the height position. At this stage, the connecting material (41) is in a bent state.
After the beam (4) is lowered to a predetermined height position, the wire (75) is loosened, and the joining material (41) is made linear by the weight of the joining material (41). At this time, if necessary, the length adjusting mechanism (80) may be operated to adjust the length of the connecting member (41). Alternatively, the length of the connecting material (41) may be adjusted before the beam (4) is lowered.
Then, the clamp mechanism (90) is operated using the swing mechanism (92), and the support (2) peripheral surface is gripped by the clamp mechanism (90). Alternatively, if the swing mechanism (92) described with reference to FIGS. 22 to 24 is used, the clamp mechanism (90) grasps the support (2) at the stage of straightening the bent connecting material (41). .
After the beam (4) is fixed to the column (2) by the clamp mechanism (90), the mounting member (44) and the arm member (91) are fixed to the column (2) by welding or bolting. In this way, the beam (4) is permanently fixed to the support column (2), and the structural strength of the simple bridge (1) is prevented from decreasing over time.

  The present invention can be easily constructed, and is preferably applied to a simple bridge having a high structural strength for a long time even after construction.

It is the outline appearance figure which looked at the bridge constructed by the bridge construction method concerning the present invention from the side. It is the sectional view on the AA line of FIG. It is detail drawing which shows embodiment of a beam. (A) is the figure which looked at the beam from the upper part, (b) is the figure which looked at the beam from the front. It is a figure which shows the cylindrical connection body connected with the beam shown in FIG. (A) is a top view, (b) is a front view, and (c) is a B direction arrow view. It is a figure which shows the state which connected the beam shown in FIG. 3 between support | pillars (2) with the cylindrical connection body shown in FIG. (A) is sectional drawing seen from upper direction, (b) is a front view. It is a flowchart which shows the construction method of the simple bridge shown in FIG.1 and FIG.2. It is a figure which shows 1 process of the construction method of a simple bridge. It is a figure which shows 1 process of the construction method of a simple bridge. It is a figure which shows 1 process of the construction method of a simple bridge. It is a figure which shows 1 process of the construction method of a simple bridge. It is a front view of the beam which comprises the simple bridge of a 1st reference form . It is a top view of the figure shown in FIG. It is a figure which shows the state before and behind the expansion | extension of the beam which concerns on a 1st reference form . It is a front view which shows the state which attached the beam which concerns on a 1st reference form between support | pillars. FIG. 15 is a top view of FIG. 14. It is a figure which shows the structure of the beam used for the simple bridge of a 2nd reference form . It is a figure which shows the structure of the beam used for the simple bridge of a 2nd reference form . It is a figure which shows the structure of the beam used for the simple bridge of a 3rd reference form . It is a figure which shows the structure of the beam used for the simple bridge of a 3rd reference form . It is a figure which shows the structure of the beam used for the simple bridge of a 3rd reference form . It is a figure which shows the structure of the beam used for the simple bridge of a 3rd reference form . It is a figure which shows the form of another rocking | fluctuation mechanism. It is a figure which shows the form of another rocking | fluctuation mechanism. It is a figure which shows the form of another rocking | fluctuation mechanism.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Simple bridge 2 ... Post 3 ... Panel material 4 ... Beam 41 ... Connection material 42 ... Breath material 43 ... Fixed Plate 44 ··· Mounting member 6 ··· cylindrical connecting body 75 ··· wire 81 ··· male screw member 82 ··· female screw member 83 ··· female screw rotating means 84, 85 · Wire 90... Clamp mechanism 91... Arm member 92.

Claims (1)

A column erecting process for erecting a plurality of columns on the ground;
  A panel placement step for placing a panel material on the upper portion of the support;
  A beam disposing step of disposing a beam at a predetermined height between the adjacent struts;
  The column that is erected in the column erecting step is welded or bolted to a cylindrical connection body that externally fits the column.
  In the beam arranging step, a bridge construction is characterized in that a plurality of fixed-length connecting members arranged at intervals in the vertical direction provided in the beam are connected to the cylindrical connecting body. Method.

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