JP2754250B2 - Arch formwork support - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to an arch-shaped form support applied to construction of arch concrete in an arch bridge or the like.

(Prior art) Japanese Patent Application Laid-Open No. Sho-07-19710 has been developed for efficient, safe and economical construction of arched concrete as in arch bridges.
The arch-type form support according to 63-22968 etc. has already gained a good reputation, with many construction results. In this arch-shaped form support, a triangular unit support element is formed by a main rod and a pair of side rods, many of which are pin-connected to each other at the ends of the main rod, and are connected to each other at a connection portion of both side rods. Are connected by a sub-rod, and furthermore, a reinforcing main rod is connected to the outside of each main rod in each support element. For the purpose of erection work, this shoring work is to form a semi-arched shape in which the arch is divided into two parts at the center, and a pair of them is suspended by a crane and the top ends of the main rod and the reinforcing main rod are put on each other. Pins are connected via end connecting rods connecting the parts.

(Problems to be Solved by the Invention) By the way, the above-mentioned supporting structure in which a reinforcing main rod is added to the main rod is intended for a construction having a long arch span, and therefore, a semi-arch-shaped structure itself is considerably used. Large and heavy. Therefore, in actual construction, except for the main reinforcing rod, semi-arched members formed by combining the required number of main rods, side rods and auxiliary rods are connected via end connecting rods at the top of each other. After that, a method of connecting the reinforcing main rod is adopted.

However, in this case, since only one point is supported by the end connecting rod when the reinforcing main rod is not installed, the posture is not determined, and thus the work of aligning the pin holes to be connected is very troublesome. It will take time, and improvement has been desired.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and erection of an arch-shaped form supporting structure of a type in which a reinforcing main rod is added to a supporting element, particularly, connection of end connecting rods at the top and end connecting of reinforcing main rods. An object of the present invention is to provide an arch form support that can be easily connected to a rod and has good workability.

(Means for Solving the Problems) Regarding the configuration of the present invention for achieving the above object,
With reference to the drawings corresponding to the embodiments, the arch-shaped form support of the present invention includes a plurality of triangular support elements 4 formed by connecting a main rod 5 and a pair of side rods 6, 6 to each other. Along with the main rods 5, the connecting portions 7, 7 of the side rods 6, 6 of each support element 4 are connected to each other by sub-rods 9, 9. The reinforcing main rods 10 and 10 are connected to each other outside of the truss, and are linked to the main rods 5 to form semi-arch-shaped truss structures 3a and 3b. The terminal portion of the main rod 10 is connected 16 and 17 by an end connection 13 in which a pin hole 18 for connection is provided to a main body portion 14 having a leg portion 15 projecting downward. A tension member 20 capable of adjusting the expansion and contraction is erected between the appropriate places, and a pair of semi-arch type truss structures 3a, 3b having the above-described configuration are connected to each other by pin holes 18, 18 of end connecting rods 13, 13, respectively. Specially It is a sign.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In FIG. 1 and FIG. 2, 1, 1 were constructed at predetermined intervals prior to placing the arch concrete 2.
Leg structures such as abutments, piers, etc., 3 are those leg structures 1,1
It is an arch form support that is erected between them.

In this support 3, one end of the side rods 6 and 6 are connected to both ends of the main rod 5, and the other ends thereof are connected 7 to each other to form a support element 4 having a triangular frame. With this as a unit, many of them are connected to each other by pins 8 at the ends of the main rods 5,5, and the connecting parts 7,7 of the side rods 6,6 of each support element 4,4 are connected to the main rod 5,
Connected by shorter auxiliary rods 9,9 to form semi-arched truss structures 3a, 3b. The degree of the curve formed by the arch form support 3 is determined by the length of the auxiliary rod 9. In addition, the length (span) can be changed by increasing or decreasing the number of connections of each support element 4, and can be applied to construction of arch concrete having various span lengths and degrees of curvature.

Outside the main rods 5, 5 of the support elements 4, 4 in the semi-arched truss structures 3a, 3b, reinforcing main rods 10, which are formed in the same manner as the main rods 5 at a required interval, 10 pin each other 11,
11, one end of a connecting rod 12, 12 having a required length is pivotally connected to each connecting portion of the main rods 5, 5 via a pin 8, and the other end is opposed to a reinforcing main rod 10, 10 are pivotally connected to the respective connecting portions of the connecting rods 10 via pins 11, and the reinforcing main rods 10, 10 are connected to the connecting rods 12, 1 outside the main rods 5, 5.
The link is connected by 2.

In this case, the ends of the main rods 5 and the reinforcing main rods 10 located on the top end sides of the truss structures 3a and 3b are connected by end connecting rods 13 different from the connecting rods 12, respectively. This end connecting rod
13 is formed by projecting a leg 15 at the lower part of a main body 14 formed wide in the longitudinal direction of the main rod 5, and the reinforcing main rod 10 and the main rod 5 are formed above and below one side of the main body 14. Each end is connected by pins 16 and 17, and a pin hole 18 for connecting the end connecting rods 13 to each other is provided outside the intermediate portion of the pin connection portion. And turnbuckle at the lower end of leg 15
One end of a tension member 20 that can be adjusted to expand and contract by 19 etc.
The other end of the tension member 20 is connected to an appropriate portion of the main rod 5, for example, a pin 8.

The shoring of the present invention is configured as described above. In erection of the shoring, first, the supporting elements 4 and 4 composed of the main rod 5 and the side rods 6 and 6 are connected, and the sub-rods 9 and 9 are connected thereto. Assemble the semi-arched truss structures 3a, 3b formed on the ground, lift them with a crane, and attach the terminals of the main rods 5, 5 at the lower ends to the brackets 22, 22 of the leg structure 11 with the pins 23. , 23, and connect the end connecting rods 13, 13 provided on
Combine with 4. In this case, the end connecting rod 13 pin-connected 16 to the main rod 5 by the pin 16 is maintained in a predetermined posture because the lower end of the leg 15 is also connected by the tension member 20. Therefore, the work of aligning the pin holes 18, 18 with each other can be easily performed. In this case, as shown in FIG. 3, if the tension member 20 is slightly shortened and the end connecting rod 13 is tilted to move the pin hole 18 toward the other party, the pin holes 18 Alignment becomes easier. And pin hole 1
After the pins 24 are inserted into the joints 8 and 18, the tension members 20 are extended and returned, and as shown in FIG.
13, 13 are pin connections 16, 16 with the main rods 5, 5 and mutual pin connections 24
Thus, a predetermined posture suitable for connecting the reinforcing main rods 10, 10 is maintained.

Thereafter, one end of the reinforcing main rods 10, 10 is connected to the brackets 22, 22 by pins 27, 27, and the other end is connected to the connecting rods 12, 12, and attached, and the reinforcing main rods 10, 10 are sequentially added upward. And the reinforcing main rods 10, 10 corresponding to the tops have their end portions connected to the end connecting rods 13, 13
And pin connection 17,17. At this time, the tensile material 20,20
The expansion and contraction adjustment facilitates the work of connecting the connecting pins 17 and 17.

After erection of the arch-shaped form support in this way, loosen the tension members 20 and 20 and connect the end connecting rods with the tension members 20 and 20.
If the restraint to the 13,13 is released, the main rods 5,5 and the reinforcing main rods 10,10 can be freely connected to the connecting rods 12,12 and the end connecting rods 13,13 by pin connection. , Main rods 5,5 and reinforcing main rods 10,
The load distribution to 10 will be equalized. In addition, when removing the shoring, if tension is applied to the tension members 20, 20, the remaining shoring remains stable even if the main reinforcing rods 10, 10 are removed. , 3b are each suspended by a crane or the like and the tension members 20, 20 are contracted to release the shear stress applied to the connecting pins 24 of the end connecting rods 13, 13, so that the pins 24 can be easily pulled out. become.

The form supports 3 are arranged in a row at a required interval in the depth direction of the arch concrete to be constructed, and are connected to each other and are framed. Then, on top of that, batter 2
The formwork 26 is placed via the 5, 25, and the arch concrete 2 is cast.

(Effects of the Invention) As described above, according to the present invention, the mounting posture of the end connecting rod interposed in the connection of the semi-arched truss structure can be ensured by the tension member, and therefore, the semi-arched truss structure can be secured. The work of connecting the pins at the top of the truss-shaped truss structure is easy and efficient, and after erection of the entire arch-shaped form support, the support of the end connecting rod by the tension member is released. It is possible to properly distribute the load to the ship, and it is possible to exert a predetermined strong strength as a shoring work. Many excellent effects are achieved, such as the work of pulling out the connecting pin in the end connecting rod can be easily and efficiently performed.

[Brief description of the drawings]

FIG. 1 is a front view showing one embodiment of the present invention, FIG. 2 is an enlarged front view of the top, FIG. 3 is a front view showing a state before the top of the semi-arched truss structure is joined, FIG. FIG. 4 is a front view showing the same connection state. DESCRIPTION OF SYMBOLS 1 ... Leg structure, 2 ... Arch concrete 3 ... Form support 3a, 3b ... Semi-arch type truss structure 4 ... Support element, 5 ... Main rod, 6 ... Side rod 8 ... … Pin, 9… Auxiliary rod 10… Reinforcement main rod, 11… Pin 12… Link rod, 13… End link rod 14… Main body, 15… Leg 16,17… Pin, 18… Pin hole 20… Pull rod, 21… Pin 22… Bracket 23,24,27… Pin, 25… Form

Claims (1)

(57) [Claims] A large number of triangular support elements formed by connecting a main rod and a pair of side rods are connected to each other by pin connection at the ends of the main rods, and a pair of side rods in each support element are connected. The connecting parts are connected to each other by the auxiliary rods, and furthermore, reinforcing main rods are respectively connected outside each main rod in each support element, and linked to each main rod to form a semi-arched truss structure. The terminal part of the main rod and the reinforcing main rod located at the top is formed by an end connecting rod provided with a connecting pin hole in a main body part having a leg part projecting downward, and the leg part And a tension member that can be adjusted to extend and contract is installed between appropriate positions of the main rod and the main arch, and a pair of the semi-arched truss structures having the above-described configuration is pin-connected to each other by a pin hole of an end connecting rod.
Arch formwork support.