JPH01154907A - Position compensating fixing method of half-arch for constituting arch ring in arch bridge - Google Patents

Abstract

PURPOSE: To enable a minute adjustment at the time of connecting arches by erecting a semi-arch part on a supporting bearing of a rotation bearing for fixing a semi-arch-part to an arch-abutment, and by providing an expandable flat jack between the supporting bearing and the upper shoe. CONSTITUTION: The lower shoe 2 of a rotation bearing 1 is fixed to an arch- abutment 3 for fixing and holding the arch 8 of an arch bridge. On the other hand, a jack housing flat chamber is provided between the upper shoe 4 of a rotation bearing 1 and a supporting bearing 5 placed on the upper thereof for housing an expandable flat jack. After the half part 8 of the arch part is successively constructed on the supporting bearing 5, a semi-arch part is loweringly turned making a center of the rotation bearing to be connected to the semi-arch 8 on the opposite side. The difference at the time of connection is corrected by the expansion of the flat jack. Then, the distance between the base end of the semi-arch part 8 and the arch-abutment 3 is fixed by concrete. Thus, the positional correction can be easily carried out.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a method for adjusting and fixing the position of a half-arch for forming an arch ring of an arch bridge constructed by a lowering (lowering rotation) method. .

[Prior art]

Conventionally, when constructing an arch ring of an arch bridge using the lower ring method, first, as shown in FIG.
．． A bridge abutment 13 and an anchor block 14 are constructed, a stiffening girder 15 is erected and fixed across the abutment 12 and the abutment 13, and a hydraulic jack for pushing and pulling is installed in a guide rail 16 with a groove-shaped cross section extending in the longitudinal direction. A half-arch push-pull device 18 is constructed by arranging the rear part of the horizontal arm 17 that is moved in the direction, and the guide rail 16 of the half-arch push-pull device 18 is fixed to the stiffening girder 15, and the arch abutment 3 is fixed to the stiffening girder 15. The lower shoe of the rotary support 19 is fixed to.

Next, using the climbing formwork 20, a concrete half-arch 8 is constructed almost vertically from below to above on the upper shoe of the rotary support 19 until it reaches a position slightly higher than the bridge surface. After constructing the half-arch 8, connect the front end of the horizontal arm 17 of the half-arch rotation device 18 to the half-arch 8 with a pin, and then connect the horizontal arm 17 with the push-pull hydraulic jack. The half-arch 8 is completed by pulling the half-arch 8 backward, tilting the half-arch 8 backward, and then sequentially moving the climbing formwork 20 upward again and adding the half-arch constituent parts. do.

Next, the horizontal arm 17 is moved by the hydraulic jack for pushing and pulling.
The half-arch 8 is pressed forward and rotated through the half-arch 8 to tilt the half-arch 8 forward.

Next, a lowering cable 22 was stretched between the distal end of the half-arch 8 and the hydraulic jack 21 for feeding connected to the anchor block 14, and the horizontal arm 17 was removed from the half-arch 8. While gradually letting out the lower ring cable 22 from the pay-out hydraulic jack 21, the half-arch 8 is rotated downward to a predetermined arch ring installation position, and then the arch crown portion is constructed between the tips of each half-arch 8. An arch ring construction method is known (for example, see "Bridges and Foundations", Vol. 20, No. 12 (pages 17 to 20), published by Kensetsu Tosho Co., Ltd., December 1, 1986).

[Problem that the invention seeks to solve]

When constructing an arch ring using the conventional construction method, half arches are constructed on each arch abutment on both banks, so in reality, discrepancies occur in the tips of the half arches on both sides due to the following reasons.

(1) The half-arches on both banks are supported by independent rotary bearings, but it is difficult to install each rotary bearing with high precision at the predetermined position of the arch abutment, and during construction and lowering of the half-arches, Torsion may occur in the rotary bearing, which causes a misalignment of the tips of the two half-arches after lowering.

(2) If the half-arches are not constructed to the predetermined size and shape, discrepancies will occur between the tips of the half-arches on both sides after lowering.

(3) If the arch abutments on both banks settle unevenly, discrepancies will occur at the tips of the half arches on both sides after lowering.

As mentioned above, if the tips of the half arches on both sides are misaligned after lowering, it is impossible to form an arch ring with a predetermined shape.

[Purpose and structure of the invention]

The object of the present invention is to provide a method for correcting and fixing the position of half arches forming an arch ring in an arch bridge, which can advantageously solve the above-mentioned problems. The lower shoe 2 of a plurality of rotation bearings 1 arranged at intervals is connected to an arch abutment 3.
and housing an expandable flat jack 7 in a flat jack accommodating chamber 6 provided between the upper shoe 4 of the rotary support 1 and the support plate 5 placed on the upper part,
Next, a half arch 8 was constructed on the upper part of the support plate 5 from the bottom to the top.
The arch ring is rotated downward about the horizontal axis 9 of the arch ring to the installation position, and then the liquid 10 is press-fitted into the expandable flat jack 7 to expand the expandable flat jack 7, thereby forming each half arch 8. In order to correct the discrepancy at the tips, fixing concrete 11 is poured between the base end of the half arch 8 and the arch abutment 3 to fix the base end of the half arch 8 to the arch abutment 3. The present invention provides a method for correcting and fixing the position of half-arch arch rings in an arch bridge.

〔Example〕 Next, the invention of B will be explained in detail using illustrated examples.

12 to 16 show a rotary support device 23 with a built-in flat jack used in an embodiment of the present invention, in which a lower shoe 2 having a pin hole 24 and an upper shoe 4 having a pin hole 25 are arranged on the left and right sides. A steel rotary support 1 is constructed by being rotatably connected by a horizontal shaft 9 extending in the direction of the support plate 5, which is made of a steel plate and has a downward opening in the center of the lower part, and is placed on the upper surface of the upper shoe 4. The downward opening recess and the upper surface of the upper shoe 4 constitute a flat chamber 6 for housing jacks. The peripheral edges of two thin mild steel plates having a concave portion with a semicircular cross section are joined together by welding to form an expandable flat jack 7, and the expandable flat jack 7 is connected to an injection pipe 27 having an on-off valve 26 for opening and closing. A hardening filler 3 such as epoxy mortar is connected to the discharge pipe 29 having a valve 28 and is placed in the recesses at the upper and lower parts of the expandable flat jack 7.
The expandable flat jack 7 filled with the hardening filler 30 is housed in the flat jack accommodating chamber 6, and the injection pipe 27 and the discharge pipe 29 are inserted into the groove 31 provided in the support plate 5. is led to the outside through.

The lower portions of a plurality of anchor rods 32 are inserted around the two-part shoe 4 and the support plate 5, and the upper nuts 1-33 screwed to the anchor rods 32 are engaged with the upper surface of the support plate 5. , a lower nut 34 screwed onto the anchor rod 32 is engaged with the upper shoe 4.

Next, a method for correcting and fixing the position of a half-arch for forming an arch ring according to an embodiment of the present invention using the rotary support device 23 with a built-in flat jack will be described.

First, as shown in Figures 1 to 3, the arch abutment 3 and abutment 35 are constructed at both ends of the planned arch ring installation position, and the anchor block 36 located behind the abutment 35 is constructed, and the anchor block 36 is constructed at the rear of the abutment 35. 36 to the ground with a large number of rock anchors 37, and furthermore, at a predetermined position of the arch abutment 3,
The lower part of the anchor bolt 38 for fixing the lower shoe in the rotation support is embedded.

Two rotary support devices 2 with built-in flat jacks arranged at intervals in the left-right direction on the next 1 near abutment 3
3, the fixing pin 40 is inserted through the lower shoe 2 of the rotation support 1 in the anchor pole 1-38 and the lower shoe 2 and the upper shoe 4 of the bottom support 1 screwed thereto, and the upper shoe is fixed. 4. Prevent rotation.

Next, using a known climbing formwork 41, the upper shoe 4 is
Concrete half arches 8 are successively constructed from the bottom to the top.

After constructing the half-arch 8 of a predetermined length, as shown in FIGS. 4 to 6, one end of the pulling cable 42 made of wire rope is inserted into the middle part of the half-arch 8 to attach the fixing device 43. The other end of the pulling cable 42 is inserted into the middle part of the half arch 8 on the opposite bank, and the pulling liquid is made of a cylinder having a cable clamp and a screw and rod having a cable clamp. A pressure jack 44 is installed on the anchor block 36 on the opposite bank, the other end of the pulling cable 42 is gripped by the cable clamp, and the pulling cable 42 is tensioned by the pulling hydraulic jack 44.

In addition, one end of two lowering cables 22 made of wire rope is inserted into the tip of the half arch 8 to connect the fixing device 4.
A hydraulic jack 46 for the lower ring, which is fixed to the anchor block 36 at the rear of the half arch 8 and consists of a cylinder having a cable clamp and a piston rod having a cable clamp, is installed at the other end of the lower ring cable 22. The side portion is gripped by the cable clamp, the lower ring cable 22 is tensioned by the lower ring hydraulic jack 46, and the fixing pin 4 is tightened.
0 is removed to complete the preparation for lowering work.

When performing lowering work, first tension the pulling cable 42, and while applying a predetermined tension to the pulling cable 42, gradually pull the two lowering cables 22 from the lowering hydraulic jack 46. As shown in FIG. 4, the half arch 8 is lowered.

The tensioning of the pulling cable 42 and the letting out of the lowering cable 22 as described above are repeated many times in small steps to lower the half arch 8. The half-arch 8
When it is in a state where it naturally rotates downward due to its own weight,
The pulling cable 42 is relaxed and removed, and the lower ring cable 22 is gradually let out from the lower ring hydraulic jack 46 again, and the half arch 8 is lowered by its own weight to the predetermined arch ring installation position shown in FIG. 7. rotate it,
The other half arch 8ii! The arch ring is also rotated downward to a predetermined arch ring installation position by the above-mentioned means.

When the lowering of the half arches 8 on both sides has been completed, if there is a discrepancy in the tip of each half arch 8, for example, the tip of one half arch 8 may be different from the tip of the other half arch 8.
If the tip of the anchor rod 32 is deviated from the left or right or is twisted, remove the lower nut 34 from the anchor rod 32, open the on-off valves 26 and 28, and inject liquid from the injection tube 27. At the same time, the air in the expandable flat jack 7 is discharged through the discharge pipe 29 and the on-off valve 28, and when the liquid is discharged from the on-off valve 28, the on-off valve 28 is closed.

Subsequently, by pressurizing the liquid into the flat expandable jack 7, the flat expandable jack 7 is expanded by an appropriate amount due to the pressure of the liquid 10, as shown in FIG. In this way, by inflating one or both of the inflatable flat jacks 7 by an appropriate amount, the half arches 8 were moved and the discrepancy between the tips of the half arches 8 on both sides was corrected6. Close the on-off valve 26.

Next, as shown in FIG.
7 is placed, concrete is poured into the formwork 47 to construct the arch crown portion 48, and after the concrete of the arch crown portion 48 has hardened, the lowering cable 22 is loosened and removed. As shown in FIG. 9, a lower nut 34 is screwed onto the anchor rod 32, and the lower nut 34 is engaged with the upper shoe 4, and the base end of the half arch 8 and the arch abutment 3 are connected. The fixing concrete 11 is placed with reinforcing reinforcement in between, and the rotary support device 23 with a built-in flat jack is placed in the fixing concrete 11. J
- Embedded in 1-11, concrete 11 for fixing it
The proximal end of the half-arch 8 is fixed to the arch abutment 3 by.

As described above, an arch ring 49 consisting of a pair of half arches 8 and an arch crown portion 48 was constructed 6;
Assemble the shoring on top of the arch ring 49 and
As shown in the figure, construct the pillars 50 and the upper floor board 51,
Complete the arch bridge.

When carrying out this invention, only one half-arch 8 may be moved by the inflatable flattening jack 7 to correct the discrepancy in the tips of each half-arch 8, or the half-arches 8 on both sides may be moved by the inflatable flattening jack 7. It may be moved by the jack 7 to correct the discrepancy in the tips of each half arch 8. The liquid 10 to be press-fitted into the expandable flat jack 7 is as follows:
Curable liquids may also be used.

〔Effect of the invention〕

According to this invention, the lower shoes 2 of the plurality of rotation bearings 1 arranged at intervals in the left-right direction are connected to the arch abutment 3.
and housing an expandable flat jack 7 in a flat jack accommodating chamber 6 provided between the upper shoe 4 of the rotary support 1 and the support plate 5 placed on the upper part,
Next, a half arch 8 was constructed on the upper part of the support plate 5 from the bottom to the top.
The arch ring is rotated downward around the horizontal axis 9 of the arch ring to the installation position, and then the liquid 10 is pressurized into the expandable flat jack 7 to inflate the expandable flat jack 7 by an appropriate amount. By doing so, the half arches on both sides8
It is possible to easily and quickly correct the discrepancy in the tip of the arch ring 49 of a predetermined shape, and the simple structure is interposed between the upper shoe 4 and the support plate 5. The inflatable flat jack 7 can correct the discrepancy in the tip of the half arch 8, and the inflatable flat jack 7 can also be used to fix the upper shoe 4 and the support plate 5 above it.
Therefore, after correcting the discrepancy in the tip of the half-arch 8, the gap between the proximal end of the half-arch 8 and the arch ring) and 3 can be removed without removing the jack. Effects such as being able to place the fixing concrete 11 at once can be obtained.

[Brief explanation of the drawing]

Figures 1 to 11 show one embodiment of the present invention, and Figure 1 is a partially longitudinal side view showing a state in the middle of constructing a half arch using a climbing formwork. ,
Figure 2 is a partially longitudinal side view showing an enlarged view of the vicinity of the rotary support device with a built-in flat jack in Figure 1, Figure 3 is a partially longitudinal front view thereof, and Figure 4 is when starting half-arch lowering. Fig. 5 is a side view showing a part of Fig. 4 enlarged, Fig. 6 is an enlarged plan view showing the vicinity of the anchor block in Fig. 5, Fig. 7 is a side view showing the state of A side view showing the state where the half arch has been lowered to a predetermined position and the arch crown part has been constructed, and Figure 8 is a longitudinal section showing the state where the expandable flat jack is inflated to correct the discrepancy at the tip of the half arch. Front view, Figure 9 is a front view showing the state in which fixing concrete has been placed between the base end of the half arch and the arch abutment, and Figure 10 is A-A in Figure 9.
A line sectional view and FIG. 11 are a partially vertical side view showing a state in which the arch ring has been constructed. 12 to 16 show a rotary support device with a built-in flat jack used in an embodiment of the present invention, in which FIG. 12 is a front view, FIG. 13 is a vertical side view, and FIG.
Figure 4 is a plan view, Figure 15 is a sectional view taken along the line B-B in Figure 13,
FIG. 16 is an enlarged longitudinal sectional side view of a part of FIG. 13. FIG. 17 is a side view for explaining a conventional arch ring erection method using a half-arch rotation device. In the figure, 1 is a rotary support, 2 is a lower shoe, 31 is an arch abutment, 4 is an upper shoe, 5 is a support plate, 6 is a flat chamber for housing a jack, 7 is an expandable flat jack, 8 is a half arch, 9
is the horizontal axis, 10 is the liquid, 1] is the fixing concrete, 22
Baroar ring cable, 23 is a rotation support device with a built-in flat jack, 24 and 25 are pin holes, 26 is an on-off valve, 2
7 is an injection pipe, -15=28 is an on-off valve, 29 is a discharge pipe, 30 is a hardening filler, 3
2 is an anchor rod, 33 is an upper nut, 34 is a lower nut, 36 is an anchor block, 38 is an anchor bolt, 3
9 is a nut, 40 is a fixing pin, 41 is a climbing formwork, 42 is a pulling cable, 43 is a fixing device, 44 is a pulling hydraulic jack, 45 is a fixing device, 46 is a lowering hydraulic jack, 48 is an arch crown portion, and 49 is an arch ring. 16 1st ward Sato QtsuN Ctsu 2- Fable 22: 1 Mu diagram

Claims (1)

[Claims] A plurality of rotation bearings 1 arranged at intervals in the left and right direction
The lower shoe 2 is fixed to the arch abutment 3, and the flat chamber 6 for accommodating a jack provided between the upper shoe 4 of the rotary support 1 and the support plate 5 placed on the upper part thereof is provided with an expandable shoe. The flat jack 7 is accommodated, and then the support plate 5
After constructing a half arch 8 from below to above, the half arch 8 is rotated downward about the horizontal axis 9 of the rotary support 1 to the arch ring installation position, and then the inflatable flat jack is By pressurizing liquid 10 into 7 and inflating the inflatable flat jack 7, each half arch 8 is
6. To correct the discrepancy at the tip of the half arch 8, fix the base end of the half arch 8 to the arch abutment 3 by placing fixing concrete 11 between the base end of the half arch 8 and the arch abutment 3. A method for correcting and fixing the position of a half arch for an arch ring configuration in an arch bridge, characterized by: