CN218621817U - Large-span steel pipe concrete arch bridge construction system - Google Patents
Large-span steel pipe concrete arch bridge construction system Download PDFInfo
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- CN218621817U CN218621817U CN202222325287.8U CN202222325287U CN218621817U CN 218621817 U CN218621817 U CN 218621817U CN 202222325287 U CN202222325287 U CN 202222325287U CN 218621817 U CN218621817 U CN 218621817U
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Abstract
The utility model belongs to the technical field of bridge construction, in particular to a long-span steel pipe concrete arch bridge construction system, which comprises a main arch foundation, a partition plate, a vacuum system, an arch bridge steel pipe and concrete filled in the arch bridge steel pipe; the bottom end of the arch bridge steel pipe is inserted into the main arch foundation, the partition plate is arranged at the arch top of the arch bridge steel pipe to divide the arch bridge steel pipe into two parts which are symmetrical left and right, and the vacuum system is respectively connected with the left part and the right part of the arch bridge steel pipe at the arch top; the arch bridge steel pipe upper surface is equipped with the hole of vibrating, multistage thick liquid pipe, vault grout outlet, and vault grout outlet sets up in arch bridge steel pipe vault baffle both sides, arch bridge steel pipe lower surface is equipped with row's cinder hole and row's thick liquid hole. The utility model discloses a "multistage relay multistage pump sending" both sides symmetry jacking self-compaction concrete filling construction has effectively solved the quality hidden danger in the large span steel pipe concrete arch bridge work progress, has obviously promoted the site operation convenience, is showing and has accelerated the construction speed.
Description
Technical Field
The utility model belongs to the technical field of the bridge construction, specifically relate to a long span steel pipe concrete arch bridge construction system.
Background
The steel pipe concrete is a typical structure in steel reinforced concrete formed by combining steel and concrete, and the two materials can fully exert the advantages of high compressive strength and strong bending resistance of the two materials under the synergistic action. The concrete filled steel tube arch bridge is characterized in that concrete is filled in a steel tube, the concrete filled steel tube arch bridge has a series of outstanding advantages through the synergistic and complementary action between the steel tube and core concrete, wherein the concrete pouring quality, namely the compactness of concrete pouring directly influences the bearing capacity and the composite elastic modulus of the concrete filled steel tube arch bridge, and therefore the safety of the concrete filled steel tube arch bridge is influenced, and whether the concrete filled steel tube arch bridge can normally work is influenced. Along with the development of bridge construction technology, large-span concrete-filled steel tube arch bridges are increasingly applied, the bridge type has large span and high arch top, the pumping pressure of concrete in the jacking construction process is large, and the phenomena that the steel tube wall and the concrete are separated or the concrete is internally hollow and the like are caused when a concrete pouring construction method is improper, so that the quality of the concrete-filled steel tube arch bridges is seriously influenced.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to the defect that prior art exists, provide a long-span steel core concrete arched bridge construction system for solve among the prior art long-span high vault steel core concrete arched bridge concrete placement incompact, easily exist the local debonding of coming to nothing, the poor problem of steel-concrete integration quality stability.
In order to realize the purpose, the utility model discloses the technical scheme who takes does:
a large-span steel pipe concrete arch bridge construction system comprises a main arch foundation, a partition plate, a vacuum system, an arch bridge steel pipe and concrete filled in the arch bridge steel pipe; the arch bridge steel pipe comprises an inner pipe and an outer pipe; the bottom end of the arch bridge steel pipe is inserted into the main arch foundation, the partition plate is arranged at the arch top of the arch bridge steel pipe to divide the arch bridge steel pipe into two parts which are symmetrical left and right, and the vacuum system is respectively connected with the left part and the right part of the arch bridge steel pipe at the arch top.
The upper surface of the arch bridge steel pipe is provided with a vibrating hole, a multi-stage slurry inlet pipe and a vault slurry outlet hole, the vault slurry outlet hole is arranged at two sides of a vault clapboard of the arch bridge steel pipe, and the vault slurry outlet hole is connected with a slurry storage barrel through a hose; the multistage slurry inlet pipes are sequentially arranged from arch feet to arch tops of arch bridge steel pipes.
The lower surface of the arch bridge steel pipe is provided with a slag discharge hole and a slurry discharge hole, and the slag discharge hole is positioned at the arch foot of the arch bridge steel pipe and used for removing impurities on the inner wall of the steel pipe; the grout discharging holes are positioned at 1/5-1/3 pipe chords of the steel pipes of the arch bridge and used for removing surface laitance in the middle process of jacking the concrete.
Furthermore, the multistage grout inlet pipe is used as a pouring hole for jacking concrete, and is sequentially arranged from the arch foot to the arch crown of the arch bridge steel pipe into a primary grout inlet pipe, a secondary grout inlet pipe, \8230 \ 8230;, and an n-stage grout inlet pipe, wherein the value range of n is an integer between 4 and 6.
Furthermore, the first-stage slurry inlet pipe is arranged 10-15 meters away from the main arch foundation along the jacking direction of the arch bridge steel pipe, the slurry inlet pipe closest to the partition plate is arranged 40-50 meters away from the partition plate along the jacking direction of the arch bridge steel pipe, and the distance between every two adjacent stages of slurry inlet pipes is 30-45 meters along the jacking direction of the arch bridge steel pipe.
Furthermore, the vibrating holes are arranged at the position 1-2 meters above the primary slurry inlet pipe along the jacking direction of the arch bridge steel pipe and are used for vibrating and compacting the operation holes of the arch springing concrete.
Furthermore, the intersection angle of the multistage slurry inlet pipe and the axis of the main chord pipe is set according to 25-30 degrees and extends into the main chord steel pipe by 10-20cm.
The partition plate is positioned in the center of the top of the arch bridge steel pipe and used for preventing concrete on two banks from being connected in series during jacking; both sides of the clapboard are respectively provided with a vault pulp outlet which is connected with the pulp storage barrel 5 through a hose.
The vacuum system is located in the center of the top of the steel pipe of the arch bridge, is connected with the steel pipe of the arch bridge through the grout storage barrel 5 and is used for assisting concrete jacking, pumping and pouring construction.
Furthermore, the concrete filled below the primary slurry inlet pipe at the arch foot positions at the two ends of the arch bridge steel pipe is steel fiber concrete, and the concrete filled above the primary slurry inlet pipe in the arch bridge steel pipe is self-compacting micro-expansion concrete.
The construction process of the jacking concrete adopts a mode of 'multistage relay multi-section pumping' of bilateral symmetry to carry out self-compacting concrete pumping and pouring.
To sum up, through adopting the utility model discloses technical scheme's beneficial effect does:
(1) The slag discharge holes, the vibrating holes, the two rows of grout holes, the multistage grout inlet pipes, the vault grout outlet holes and the partition plates are arranged on the steel pipes of the large-span steel pipe concrete arch bridge, so that symmetrical and step-by-step relay pumping and filling construction of the two banks of the large-span steel pipe concrete arch bridge is realized, the ultrahigh-pressure pumping concrete in the large-span and high-vault arch bridge is filled, compacted and not emptied, the quality hazards of insufficient pumping pressure, incompact concrete, easy emptying of the steel pipe concrete and the like in the construction process of the large-span steel pipe concrete arch bridge are effectively solved, the convenience of field construction is obviously improved, and the construction speed is obviously accelerated.
(2) By pouring the steel fiber concrete at the arch springing, the three-dimensional disorderly distribution and the hierarchical overlapping of the steel fibers in the steel fiber concrete effectively improve the expansion of micro cracks and the formation of macro cracks in the concrete, and obviously improve the tensile, bending, impact and fatigue resistance of the arch springing concrete. The self-compacting micro-expansion concrete is jacked and poured in the arch bridge steel pipe from bottom to top, so that the pouring compactness of the self-compacting micro-expansion concrete in the construction process of the arch bridge steel pipe is improved by fully utilizing the good construction flowability of the self-compacting micro-expansion concrete, and the local cavity generated by the dryness and poor flowability of the concrete is reduced; the calcium-magnesium composite expanding agent with small hydration water demand in the self-compaction micro-expansion concrete is used for absolute humidity self-expansion in a steel pipe sealing environment, self-contraction of the concrete is compensated, a certain micro-expansion effect is generated, the tightness of connection between the concrete and the inner wall of a steel pipe is improved, the risk of void between the concrete and the steel pipe is reduced, the integrated coordination effect of the concrete and the steel pipe is realized, and the overall mechanical property of a steel pipe concrete structure is improved.
(3) Utilize the vacuum negative pressure that vacuum system produced in the steel pipe, for the arch bridge steel pipe concrete segmentation jacking pours the in-process and provides supplementary closely knit power, reduced because lack the risk that the local cavity phenomenon that effectively vibrates and produce takes place, effectively improved the closely knit nature of pouring of self-compacting concrete in the steel pipe, ensured arch bridge steel pipe concrete construction quality.
Drawings
Fig. 1 is a schematic view of the overall structure of a large-span concrete-filled steel tube arch bridge.
FIG. 2 is a schematic structural view of a large-span concrete-filled steel tube arch bridge 1/2.
Fig. 3 is a partially enlarged schematic view of a portion a in fig. 2.
Fig. 4 is a partially enlarged view of a portion B in fig. 2.
Reference numerals: 1. the main arch foundation, 2, arch bridge steel pipes, 3, partition boards, 4, arch crown grout outlet holes, 5, a grout storage barrel, 6, a vacuum system, 7, a slag discharge hole, 8, a first-level grout inlet pipe, 9, a vibrating hole, 10, a second-level grout inlet pipe, 11, a third-level grout inlet pipe, 12, a fourth-level grout inlet pipe, 13, a grout discharge hole and 14, and a fifth-level grout inlet pipe.
Detailed Description
The technical solutions of the present invention will be further described below with reference to the accompanying drawings and specific embodiments, so as to more clearly understand the technical ideas claimed in the present invention.
Example 1
Referring to the attached drawings 1-4, the concrete-filled steel tube pouring construction system for the large-span concrete-filled steel tube arch bridge comprises a main arch foundation 1, a partition plate 3, a vacuum system 6, an arch bridge steel tube 2 and concrete filled in the arch bridge steel tube 2; the arch bridge steel pipe 2 comprises an inner pipe and an outer pipe; the bottom end of the arch bridge steel pipe 2 is inserted into the main arch foundation 1, the partition plate 3 is arranged at the arch top of the arch bridge steel pipe 2 to divide the arch bridge steel pipe 2 into two parts which are symmetrical left and right, and the vacuum system 6 is respectively connected with the left part and the right part of the arch bridge steel pipe 2 at the arch top.
The upper surface of the arch bridge steel pipe 2 is provided with a vibrating hole 9, a multi-stage slurry inlet pipe and a vault slurry outlet hole 4, the vault slurry outlet hole 4 is arranged at two sides of a vault clapboard 3 of the arch bridge steel pipe 2, and the vault slurry outlet hole 4 is connected with a slurry storage barrel 5 through a hose.
The multistage slurry inlet pipe is a first-stage slurry inlet pipe 8, a second-stage slurry inlet pipe 10, a third-stage slurry inlet pipe 11, a fourth-stage slurry inlet pipe 12 and a fifth-stage slurry inlet pipe 14 which are sequentially arranged from the arch foot to the arch crown of the arch bridge steel pipe 2.
The lower surface of the arch bridge steel pipe 2 is provided with a slag discharge hole 7 and a slurry discharge hole 13, the slag discharge hole 7 is positioned at the arch foot of the arch bridge steel pipe 2, and the slurry discharge hole 13 is positioned below the four-stage slurry inlet pipe 12.
The one-level grout inlet pipe 8 is arranged at a position 10 meters away from the main arch foundation along the jacking direction of the arch bridge steel pipe 2, the vibrating holes 9 are arranged at a position 1 meter away from the main arch foundation along the jacking direction of the arch bridge steel pipe 2 above the one-level grout inlet pipe 8, the second-level grout inlet pipe 10 is arranged at a position 30 meters away from the one-level grout inlet pipe 8 along the jacking direction of the arch bridge steel pipe 2, the third-level grout inlet pipe 11 is arranged at a position 35 meters away from the second-level grout inlet pipe 10 along the jacking direction of the arch bridge steel pipe 2 above the second-level grout inlet pipe 10, the fourth-level grout inlet pipe 12 is arranged at a position 40 meters away from the third-level grout inlet pipe 11 along the jacking direction of the arch bridge steel pipe 2 above the fifth-level grout inlet pipe 12, and the distance from the partition board 3 is 50 meters.
The center of the top of the arch bridge steel pipe 2 is provided with a steel clapboard 3 which is used for preventing the concrete at both banks from being connected in series when being lifted; the two sides of the steel clapboard 3 are respectively provided with a vault slurry outlet hole 4 which is connected with a slurry storage barrel 5 through a hose.
The vault platform is built on the two sides of the steel partition plate 3 in the center of the top of the arch bridge steel pipe 2, and the vacuum system 6 arranged on the vault platform is connected with the arch bridge steel pipe 2 through the slurry storage barrel 5 to form a matched auxiliary vacuum system 6.
The intersection angle of the multistage slurry inlet pipe and the main chord pipe is set according to 25-30 degrees and extends into the main chord steel pipe by 10-20cm.
After the rest cross brace diagonal bracing members are installed in the arch bridge steel tube 2 arch closure, the arch foot is closed, and after a hinge-free arch is formed, the buckle cable is removed, namely, the concrete construction in the arch bridge steel tube 2 arch is started, and the concrete construction technical scheme in the arch bridge steel tube 2 in the embodiment is as follows:
(1) Cleaning sundries on the inner wall of the arch bridge steel pipe 2: connecting the vault slurry outlet pipe with a water pipe, injecting clear water into the steel pipe, washing the inner wall of the steel pipe until no impurities exist in water flow at the slag discharge hole 7, and sealing the slag discharge hole 7.
(2) Pouring arch springing concrete: adopt steel fiber concrete to 2 one-level mortar inlets of arch bridge steel pipe 8 below parts, go into thick liquid pipe 8 as pouring the hole with one-level, from top to bottom carry out the pump sending and pour, put into the vibrating rod through hole 9 that vibrates and vibrate steel fiber concrete, the self-compaction dead weight of recombination concrete self realizes closely knit the packing in arch bridge arch foot department again.
(3) Pouring concrete on the part above the primary slurry inlet pipe 8 of the arch bridge steel pipe 2: the parts above 2 one-level grout inlet pipes 8 of the arch bridge steel pipe are filled with self-compacting micro-expansion concrete, concrete in the pipe is poured by adopting a two-bank symmetry and four-stage relay five-section pumping jacking process, and self-compacting micro-expansion concrete jacking construction is carried out according to the following sequence: the inner lower chord → the inner upper chord → the outer lower chord → the outer upper chord → flaw detection → grouting → acceptance. The concrete jacking and pouring construction process of the self-compacting micro-expansion concrete in the arch bridge steel pipe 2 is as follows:
(1) pumping the first section of in-pipe concrete: and (3) after the steel fiber concrete is poured, continuously pumping the self-compacting micro-expansion concrete by using the primary slurry inlet pipe 8, starting the vacuum system 6 when the concrete exceeds the position 3m high of the primary slurry inlet pipe, suspending the pump, and continuously pumping the concrete in the first section of pipe when the vacuum degree reaches over-0.06 Mpa.
(2) Pumping second section of in-pipe concrete: when the distance between the concrete in the first section of pipe and the secondary slurry inlet pipe is 0.5m, the pumping of the primary slurry inlet pipe 8 is stopped, the vacuumizing is stopped, the secondary slurry inlet pipe 10 is connected, the concrete is pumped until the distance exceeds 3m of the secondary slurry inlet pipe, the vacuumizing system 6 is started, and when the vacuum degree reaches the vacuum degree of more than-0.06 Mpa, the secondary slurry inlet pipe 10 continues to pump the concrete in the second section of pipe.
(3) Pumping third section of in-pipe concrete: and when the concrete in the second section of pipe is 0.5m away from the third-stage grout inlet pipe, stopping pumping the second-stage grout inlet pipe 10, stopping vacuumizing, connecting the third-stage grout inlet pipe 11, pumping the concrete until the concrete exceeds the third-stage grout inlet pipe by 3m, starting the vacuumizing system 6, and continuously pumping the concrete in the third section of pipe by the third-stage grout inlet pipe 11 when the vacuum degree reaches the vacuum degree of more than-0.06 MPa.
(4) And (3) discharging and pumping concrete in the fourth section of pipe: when the concrete in the third-stage pipe reaches the position of the grout discharging hole 13, vacuumizing is suspended, a valve of the grout discharging hole 13 is opened, the floating grout on the surface of the concrete is discharged, and the third-stage pipe is closed after the discharge is finished. And stopping the three-stage pumping, connecting a fourth-stage slurry inlet pipe 12, pumping the concrete until the concrete exceeds the fourth-stage slurry inlet pipe by 3m, starting a vacuumizing system 6, and continuously pumping the concrete in the fourth-stage slurry inlet pipe 12 when the vacuum degree reaches more than-0.06 Mpa.
(5) Pumping the fifth section of in-pipe concrete: when the distance between the concrete in the fourth-stage pipe and the five-stage grout inlet pipe 14 is 0.5m, the pumping of the fourth-stage grout inlet pipe 12 is stopped, the vacuumizing is suspended, the fifth-stage grout inlet pipe 14 is connected, the concrete is pumped until the distance exceeds 2m of the fifth-stage grout inlet pipe, the vacuumizing system 6 is started, and the five-stage grout inlet pipe 14 continues to pump when the vacuum degree reaches the vacuum degree of more than-0.06 Mpa.
(6) And (3) completing vault concrete pumping and in-pipe concrete pouring: when the concrete is pumped to the vault and the grout outlet hole 4 of the vault begins to discharge grout, the pump is suspended and vacuumized, the connection between the vacuum system 6 and the grout storage barrel 5 is disconnected, the vacuum system 6 is withdrawn, and then the concrete is continuously pumped. And (3) continuously discharging floating slurry from the vault into the slurry storage barrel 5, suspending pumping when the floating slurry is discharged to the greatest extent at the pipe opening and good concrete appears, standing for 5 minutes, then pumping for a plurality of times, standing for 5 minutes, and closing the five-stage slurry inlet pipe 14 to finish the whole pipe pumping when no obvious bubbles or floating slurry exists in the slurry outlet hole.
The above description is for illustrative purposes only, and it is obvious that the present invention is not limited by the above embodiments, and the present invention is not limited by the above description, and the present invention is applicable to other situations without improvement or with substantial improvement.
Claims (6)
1. A large-span steel pipe concrete arch bridge construction system is characterized by comprising a main arch foundation (1), a partition plate (3), a vacuum system (6), an arch bridge steel pipe (2) and concrete filled in the arch bridge steel pipe (2); the bottom end of the arch bridge steel pipe (2) is embedded into the main arch foundation (1), the partition plate (3) is arranged at the arch top of the arch bridge steel pipe (2) to divide the arch bridge steel pipe (2) into two parts which are symmetrical left and right, and the vacuum system (6) is respectively connected with the left part and the right part of the arch bridge steel pipe (2) at the arch top;
the upper surface of the arch bridge steel pipe (2) is provided with a vibration hole (9), a multistage slurry inlet pipe and a vault slurry outlet hole (4); the arch crown grout outlet holes (4) are formed in two sides of the arch crown partition plate (3) of the arch bridge steel pipe (2); the multistage slurry inlet pipes are sequentially arranged from arch feet to arch tops of arch bridge steel pipes (2); the lower surface of the arch bridge steel pipe (2) is provided with a deslagging hole (7) and a slurry discharging hole (13), the deslagging hole (7) is positioned at the arch foot of the arch bridge steel pipe (2), and the slurry discharging hole (13) is positioned at the 1/5-1/3 pipe chord of the arch bridge steel pipe (2).
2. The construction system of the long-span steel pipe concrete arch bridge according to claim 1, wherein the multistage grout inlet pipes are primary grout inlet pipes (8), secondary grout inlet pipes (10), \8230 \ 8230;, and n-stage grout inlet pipes, and the value range of n is an integer between 4 and 6.
3. The construction system of the large-span steel pipe concrete arch bridge according to claim 2, wherein the first-stage grout inlet pipe (8) is arranged 10-15 meters away from the main arch foundation (1) along the jacking direction of the arch bridge steel pipe (2), the grout inlet pipe closest to the partition plate (3) is arranged 40-50 meters away from the partition plate (3) along the jacking direction of the arch bridge steel pipe (2), and the distance between two adjacent stages of grout inlet pipes is 30-45 meters along the jacking direction of the arch bridge steel pipe (2).
4. The construction system of the long-span steel pipe concrete arch bridge according to claim 2, wherein the vibrating holes (9) are arranged above the primary slurry inlet pipe (8) along the jacking direction of the arch bridge steel pipe (2) by 1-2 meters.
5. The construction system of the large-span steel pipe concrete arch bridge according to any one of claims 1 to 4, wherein the intersection angle of the multistage slurry inlet pipe and the axis of the arch bridge steel pipe (2) is set according to 25-30 degrees and extends into the arch bridge steel pipe (2) by 10-20cm.
6. The large-span steel pipe concrete arch bridge construction system according to any one of claims 1 to 4, wherein the concrete filled below the primary grout inlet pipe (8) at the arch foot at both ends of the arch bridge steel pipe (2) is steel fiber concrete, and the concrete filled above the primary grout inlet pipe (8) in the arch bridge steel pipe (2) is self-compacting micro-expansive concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222325287.8U CN218621817U (en) | 2022-09-01 | 2022-09-01 | Large-span steel pipe concrete arch bridge construction system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222325287.8U CN218621817U (en) | 2022-09-01 | 2022-09-01 | Large-span steel pipe concrete arch bridge construction system |
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| CN218621817U true CN218621817U (en) | 2023-03-14 |
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| CN202222325287.8U Active CN218621817U (en) | 2022-09-01 | 2022-09-01 | Large-span steel pipe concrete arch bridge construction system |
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