JPS6314903A - Arch ring execution method in concrete arch bridge - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a method of constructing an arch ring in a concrete arch bridge.

[Prior art]

Conventionally, when constructing an arch ring for a relatively medium-sized concrete arch bridge of 50 to 100 m over a river, it is not possible to assemble ground-type shoring under the arch ring.

After installing the arch center between the arch abutments.

Formwork was erected over the arch center and concrete was then poured to form the arch ring.

[Problem that the invention seeks to solve]

According to the above conventional method, once an arch ring is formed, the arch center will be under the arch ring, so it is extremely difficult to dismantle and remove the arch center from above the arch ring using a tower crane, etc. Due to its complexity, it took many days to complete the work, which was a factor in increasing the construction cost of concrete arch bridges. Although concrete arch bridges use less materials and are considered to be a structural type suitable for long-radius bridges, the reason why there are few practical examples is that the construction cost accounts for a large proportion of the overall construction cost. It is said that

[Purpose and structure of the invention]

The object of the present invention is to provide an arch ring construction method for a concrete arch bridge that advantageously solves the above-mentioned drawbacks and can construct a concrete arch bridge at low construction cost. However, the arch center 1 was placed in advance at the top of the arch ring construction location.
The arch ring block construction formwork is supported by the formwork moving support device 2 mounted on both sides of the arch center 1, concrete is poured into the formwork, and the arch ring block 6 is assembled and erected. and the step of moving the formwork, which has been removed from the mold after the concrete has hardened, using the movable support device 2 are repeated, and the arch ring block 6 in the middle of the arch ring erection is moved by the arch center 1 to the arch ring hanging material. Support through 4 and arch ring 5
After it is completed.

Arch ring hanging S4. *An arch ring construction method for a concrete arte bridge that is characterized by removing and dismantling arch center 1.

〔Example〕

Next, the present invention will be explained in detail using illustrated examples.

7 to 12 show a formwork moving support device 2 used in an embodiment of the present invention, in which an intermediate girder 6, side girders 7 disposed on both left and right sides of the intermediate girder 6, and each girder A large number of sleepers 9 are placed and fixed on the upper surface of the side girder members 7 of the steel arch center 1, which consists of a large number of connecting beams 8 connecting
are placed and fixed across each sleeper 9, and the wheels 12 of a car body 16 consisting of a car body frame 11 and wheels 12 attached to both the left and right sides of the front and rear parts of the car body frame 11 are placed on the rails 10, and the wheels 12 are placed on the rails 10. 1 and the formwork support frame 14 below the formwork movement support device 2.
The body frame 11 includes a plurality of lower frame members 15 extending in the left-right direction and spaced apart in the front-rear direction, and a plurality of lower frame members 15 extending in the front-rear direction and spaced apart in the left-right direction. An upper frame member 16 is detachably fixed to a lower frame member 15 with bolts or the like, and the formwork support frame 14 extends in the front-rear direction and is arranged at intervals in the left-right direction. a plurality of lower frame members 17, a plurality of intermediate frame members 18 extending in the left-right direction, spaced apart in the front-rear direction, and removably fixed to the lower frame members 17 with bolts or the like; The upper frame member 19 extends in the upper frame member 18 and is arranged at small intervals in the left-right direction, and is detachably fixed to the intermediate frame member 18 with bolts or the like.

Frame hanging members 20 made of steel rods having threads over the entire length are arranged at intervals in the front-rear direction and left-right direction, and the upper part of the frame hanging members 20 is.

It is inserted between the upper frame members 16 arranged at small intervals.

The support fitting 22 has a semi-cylindrical upper convex surface extending in the left-right direction and a hanging material insertion hole 21 expanding upward.
The movable support fitting 26 is fitted into the upper part of the frame hanging material 20 and placed over the upper surface of the adjacent upper frame material 16, and has an arcuate lower concave surface extending in the left-right direction.
The supporting metal fitting 22 is fitted onto the upper part of the frame hanging material λ.
The frame hanging member 20
The nut 24 screwed onto the upper part of the movable support fitting 26
Supported by

The lower part of the frame hanging material 20 is inserted between the lower frame materials 17 arranged at small intervals, and has a semi-cylindrical lower convex surface extending in the left-right direction and a hanging material insertion hole 2 expanding downward.
5 is a movable support fitting 27 that is fitted into the lower part of the frame hanging member 20 and abuts across the lower surface of the adjacent lower frame member 17, and has an arcuate upper concave surface extending in the left-right direction. The nut 2 is fitted into the lower part of the frame hanging material 20 and is fitted to the support fitting 26 so as to be tiltable, and is further screwed into the lower part of the frame hanging material 20.
The movable support fitting 27 is supported by 8.

A side mold includes a bottom formwork 29 placed over the upper surface of each of the upper frame members 19 and removably fixed with bolts or the like, and support frames 60 provided on the left and right upper surfaces of the bottom formwork 29. A frame 61 is placed and removably fixed with bolts or the like, and furthermore, a front end formwork 66 having a support frame 62 is placed on the upper surface of the front part of the bottom formwork 29 and is removably attached with bolts or the like. The bottom formwork 29, the side formwork 61, and the front formwork 66 constitute a formwork for constructing the arch ring block.

A large number of upper frame members 64 extending in the left-right direction are arranged at intervals in the front-rear direction, and at both left and right ends of each upper frame member 64, two lower frame members 65 are arranged at small intervals in the front-rear direction. Each upper frame member 34 is arranged to extend.
and the lower frame member 65 are removably fixed with bolts or the like, and the scaffold board 66 is placed across each upper frame member 64 and removably fixed with bolts or the like, and the upper frame member 64.
Scaffolding 67 consisting of a lower frame member 65 and a scaffold board 66 is arranged below the formwork support frame 14, and the lower parts of the frame hanging members 20 located outside fj of the side girder member 7 are arranged at small intervals. The movable support metal fitting 2 is inserted between the left and right lower frame members 65 and is screwed onto the frame hanging material 20 in the same way as when supporting the formwork support frame 14.
7 and the lower frame member 65 of the scaffolding 67 via the support fittings 26
is supported.

The front end of a climbing jack 68 made of a hydraulic jack is connected to the rear end of the vehicle body 13 by a pin, and a rail clamp 39 is connected to the rear end of the climbing jack 68 by a pin. A manually operated lever traction machine 40 is connected to the front end, and a rail clamp 42 is connected to the end of a chain 41 wrapped around a load sheave of the traction machine 40.

When moving the formwork moving support device 2 configured in this way from the lower level side of the arch center 1 to the higher level side,
Grip the rail 10 with the rail clamp 9 attached to the climbing jack 68, and with the rail clamp 39 fixed to the rail 10, extend the fly bang jack 68 and move the formwork moving support device 2. Move upward along arch center 1. In this case, in order to prevent the vehicle body 16 from floating up, the rail 10 is gripped by the support metal fittings 22 attached to the chain 41, and the lever manually operated traction machine 40 is moved as the formwork moving support device 2 moves forward. The chain 41 is kept under tension at all times.

When the formwork movement support device 2 is moved along the arch center 1, the formwork movement support device 2 on the arch center 1
Although the angle of the formwork 9 movable support device 2 with respect to the horizontal plane changes depending on the position of the support device 2, in the case of the above embodiment, the support metal fitting 22 having a semi-cylindrical upper convex surface, the movable support metal fitting 26 having an arcuate lower concave surface, and the nut 24 Frame hanging material 2 through
Since the upper part of 0 is suspended and supported, the frame hanging material 20 can be hung so that it is always in a vertical state.

Furthermore, even if the formwork support frame 14 and the scaffolding 67 are inclined with respect to the frame hanging material 20, the movable support fittings 27 can be rotated in the front and rear directions relative to the support fittings 26, so that
The support metal fitting 26 can always be brought into contact with the lower frame member 17 and the lower frame member 65.

When constructing an arch ring for a concrete arch bridge using this invention, first, as shown in Figure 1,
After constructing an abutment 44 and an arch abutment 45 on the ground 43, an end post 46 is constructed on top of the arch abutment 45.

In addition, an upper end slab 47 is constructed across the upper end of the end post 46 and the abutment 44.

Next, at a position slightly higher than the position where the arch ring 5 is installed, the steel arch center 1 is installed between the arch abutments 45 on both banks. When constructing this arch center 1, for example, the arch center 1 is divided into a large number of arch center blocks 48, and the arch center blocks 48 are connected from both banks using joint plates 49 and bolts by a known overhang method. Alternatively, the arch center 1 may be constructed by overhanging it into two blocks, and after assembling half of the arch center on the arch abutments 45 on both banks, this half arch center is lowered to a predetermined position. The arch center may then be constructed by connecting the opposite ends of each half arch center.

Next, below the end of arch center 1.

A column type shoring 52 consisting of a large number of columns 50 and a column connecting member 51 is assembled and installed so as to reach the level of the root of the arch ring, and on top of the column type shoring 52, a large number of supporting frames are assembled and connected. Arch ring 5 for frame type shoring 55
Assemble and install it to a height that reaches the bottom surface of the end.

Next, a formwork (not shown) is placed on the frame type shoring 56, and within the formwork, the lower part of the arch ring hanging material 4, which is made of reinforcing bars and a rod having threads over its entire length, is placed. A nut 56 screwed onto the upper end of the arch ring hanging member 4 is supported by a support beam 54 installed on the upper surface of the arch center 1, and then concrete is poured into the formwork to complete the arch. A ring end block 55 is formed.

After the concrete of the arch ring end block 55 hardens and reaches a predetermined strength, a tensioning jack (not shown) such as a center hole jack is inserted into the upper part of the arch ring hanging material 4 and the support beam is inserted. 54, and then a jack retaining nut (not shown) screwed onto the upper end of the arch ring suspension material 4 is engaged with the upper end of the tensioning jack, and the arch ring is suspended by the tensioning jack. With the material 4 under tension, tighten the nut 56 screwed onto the upper part of the arch ring hanging material 4.

The upper part of the arch ring hanging member 4 is fixed, and then the tensioning jack, the formwork, and the frame support 56 are removed. ``Next, the unfinished section of the arch ring is divided into lengths that are approximately the same as the divided length of the arch center 1, and the arch ring block 3 is stubbornly constructed following the arch ring end block 55.

When constructing the arch ring block 3, first, the constituent members of the formwork movement support device 2 are transported by a truck crane 64 or the like, and the arch center 1 and the post-type shoring 5 are installed.
Figure 2.

As shown in FIGS. 7 and 8, the formwork moving support device 2 is assembled.

Next, a lifting gloss (not shown) such as a center hole gloss is inserted into the upper part of the frame hanging material 2o, and placed on the upper frame material 16, and a jack retainer screwed onto the upper end of the frame hanging material 20 is inserted into the upper part of the frame hanging material 2o. A combination nut (not shown) is engaged with the upper end of the lifting jack, and then by the lifting jack.

Pull up each frame hanging material 20 and each part supported thereby, and bring the rear end of the bottom formwork 29 into close contact with the lower surface of the front end of the arch ring end block 55, as shown in FIG. In this state, the nut 24 is tightened, and the upper part of the frame hanging material 20 is attached to the supporting metal fitting 22 by the upper frame material 16.
It is supported via a movable support fitting 23 and a nut 24.

Next, with the rear end of the side formwork 61 in contact with the front end side surface of the arch ring end block 55, the side formwork 61
is fixed to the bottom formwork 29, and the front end formwork 33 disposed between the front ends of the left and right side formworks 61 is fixed to the bottom formwork 29 and the side formworks 61, and further, as shown in FIG. As shown in
Intermediate girder material 6 and side girder material 7 in arch center 1
A plurality of arch ring suspension members 4 made of steel rods having threads over the entire length are attached to a support beam 54 that is constructed across the entire length of the support beam 54.
The support beam 54 supports a nut 56 which is inserted through the upper part of the arch ring hanging material 4 and screwed onto the upper end of the arch ring hanging material 4.

Further, the lower part of the arch ring hanging material 4 is inserted into the internal form 57 for forming the arch ring hollow part, and the internal form 57 is inserted through the nut 58 screwed into the lower part of the arch ring hanging material 4.
is supported, reinforcing bars are placed in the recessed portion of the formwork, and concrete 59 is poured.

After the concrete 59 hardens and reaches a predetermined strength,
Side formwork 61. The front end form 36 and the internal form 57 for molding the arch ring hollow part are removed, and then the arch ring hanger 4 is tightened by tightening the nand 58 screwed onto the lower end of the arch ring hanger 4. When pouring concrete, since the weight of the concrete 59 is quite large, in order to prevent this concrete weight from acting on the wheels 12, the middle girder 6 and side girder 7 of the arch center 1 are Preferably, the vehicle body 13 is supported by a plurality of mounted wedges 60 and support blocks 61.

Next, a lifting jack such as a center hole jack (not shown) was pushed through the upper part of the frame hanging material 20, placed on the upper frame material 16, and screwed onto the upper end of the frame hanging material 20. A jack retaining nut (not shown) is engaged with the upper end of the lifting jack, and then, while loosening the nut 24, each frame hanging member 20 and each part supported by the lifting jack is connected to the upper end of the lifting jack. descending and
After demolding the bottom form 29, the climbing jack 68 and the manually operated lever traction machine 40 are used to move the form moving support device 2 forward to the position where the next arch ring block is to be constructed. Thereafter, the same operation is repeated from both banks to the arch ring block adjacent to the central arch ring block (crown).

Next, after withdrawing one of the formwork moving and supporting devices 2 to the base of the arch, that formwork moving and supporting device 2 is dismantled and removed, and the other formwork moving and supporting device 2 is replaced as shown in FIG. Move to the center of the arch center 1 and construct the central arch ring block as described above, completing construction of the entire arch ring. When constructing the central arch ring block, the internal formwork 57. Arch ring hanging material 4 and front end formwork 66 are not used.

Next, insert a tensioning jack such as a center hole jack into the upper part of the arch ring hanging material 4 and
4, and then the jack retaining nut screwed onto the upper end of the arch ring hanging material 4 is engaged with the upper end of the tensioning jack, and the arch ring hanging material 4 is tensioned by the tensioning bolt. Then, loosen the nut 56 screwed onto the upper part of the arch ring hanging material 4, and then remove the arch ring hanging material 4. After removing all the arch ring hanging materials 4 one after another in this way, the arch center 1 is dismantled and removed, and then, as shown in Fig. M4, shoring is assembled on top of the arch ring 5, and the pillars 62 and the remaining upper floor board 66 are constructed to complete the arch bridge.

When carrying out this invention, the lever manually operated traction machine 40
The chain 41 may not be fixed to the rail 10, but may be fixed to the arch center 1 by suitable means. In addition, when moving the formwork moving support device 2 forward, since there is a connecting beam 8 between the intermediate girder 6 and the side girder 7 that becomes an obstacle to the movement of the frame hanging material 20, the intermediate girder 6 and the side beam members 7 are removed, and the formwork moving support device 2 is moved forward.

〔Effect of the invention〕

According to this invention, the arch center 1 is assembled and erected in advance above the location where the arch ring is to be constructed, and the formwork for arch ring block construction is moved by the formwork moving support device 2 mounted on both banks of the arch center 1. The process of supporting the arch ring block 6 by pouring concrete IJ-t into the formwork, and the process of moving the demolded formwork by the movable support device 2 after the concrete has hardened are repeated. Since the arch ring block 6 is supported by the arch center 1 via the arch ring hanging material 4, the arch ring 5 is constructed in parts by repeatedly using the short arch ring block construction formwork. Therefore, the arch ring 5 can be constructed by a small number of people and in a fixed construction cycle, and since short formwork is used repeatedly, arch ring erection costs can be reduced. Since it is constructed on the arch ring 5, the arch center 1 can be dismantled and removed easily and in a short time after the construction of the arch ring 5 is completed.

[Brief explanation of drawings]

The drawings show one embodiment of the invention. Figure 1 is a schematic side view showing the state in which the arch center has been erected and the arch ring end blocks have been constructed, and Figure 2 is the state in which the frame support has been removed and the formwork moving support device has been assembled and installed on the arch center. Figure 3 is a schematic side view showing the state in which the center arch ring block is being constructed, and Figure 4 is a schematic side view showing the state in which the arch ring construction has been completed and the arch center has been removed. be. M
FIG. 5 is a side view showing the formwork moving support device installed at the arch ring block construction position, and FIG. 6 is a longitudinal sectional front view showing the arch ring block with conocrete cast. Fig. 7 is a side view of the formwork moving support device, Fig. 8 is a longitudinal sectional front view thereof, Fig. 9 is a side view showing the support structure for the upper end of the frame hanging material, Fig. 10 is a plan view thereof, and Fig. 11 is a side view of the formwork moving support device. The figure is a side view showing the formwork support frame and the support structure of the lower frame member in the scaffolding, and FIG. 12 is a bottom view thereof. In the figure, 1 is an arch center, 2 is a formwork movement support device, 6 is an arch ring block, 4 is an arch ring hanging material, 5 is an arch ring, 10 is a rail, 11 is a car body frame, 16 is a car body, and 14 is a mold A frame support frame, 20 a frame hanging material, 21 a hanging material insertion hole, 22 a supporting metal fitting, and 25 a movable supporting metal fitting. 24 is a nut, 25 is a hanging material insertion hole, 26 is a support metal fitting, 2
7 is a movable support metal fitting, 28 is a nand, 29 is a bottom formwork, 5
1 is a side formwork, 63 is a front end formwork, 37 is a scaffold, 38 is a climbing gloss, 69 is a rail clamp 540 is a lever manually operated traction machine, 41 is a chain, 42 is a rail clamp, 44 is an abutment, 45 is an arch abutment, 48 is an arch center block, 52 is a post type shoring, 56 is a frame type shoring, 54 is a support beam, 55 is an arch ring end block, and 56 is a nut.

Claims (1)

[Claims] An arch center 1 is assembled and erected in advance above the planned arch ring construction position, and the formwork for arch ring block construction is supported by the formwork moving support device 2 mounted on both sides of the arch center 1. The process of pouring concrete into the arch ring block 3 and moving the formwork, which has been removed from the mold after the concrete has hardened, using the movable support device 2 is repeated, and A concrete arch characterized in that a ring block 3 is supported by an arch center 1 via an arch ring hanging material 4, and after the arch ring 5 is completed, the arch ring hanging material 4 is removed and the arch center 1 is dismantled and removed. Arch ring construction method for bridges.