CN112709148B - Method for pouring concrete in transverse support pipe between steel pipe bridge arch ribs - Google Patents
Method for pouring concrete in transverse support pipe between steel pipe bridge arch ribs Download PDFInfo
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- CN112709148B CN112709148B CN202011581381.9A CN202011581381A CN112709148B CN 112709148 B CN112709148 B CN 112709148B CN 202011581381 A CN202011581381 A CN 202011581381A CN 112709148 B CN112709148 B CN 112709148B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D4/00—Arch-type bridges
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Abstract
The invention relates to a method for pouring concrete in a cross support pipe between arch ribs of a steel pipe bridge, which comprises the following steps: step 1, sequentially forming two holes at the bottom and the top of each cross supporting pipe, wherein the two holes are respectively positioned at two ends of each cross supporting pipe, the hole at the bottom of each cross supporting pipe is a grouting hole, and the hole at the top of each cross supporting pipe is a grout discharging hole; step 2, communicating a slurry discharge hole of the first cross support pipe to a slurry filling hole of the second cross support pipe through a pump pipe, and communicating a slurry discharge hole of the n-1 th cross support pipe to a slurry filling hole of the n-th cross support pipe; and 3, connecting the concrete conveying pump pipe with the grouting hole of the first cross support pipe, performing concrete grouting, stopping pumping when the concrete flowing out of the grout discharging hole of the nth cross support pipe contains aggregate, closing a valve of the pump pipe, completing grouting of one cross support pipe assembly, and performing concrete grouting of the next cross support pipe assembly. The pouring method can effectively shorten the construction period and improve the safety of construction and environment.
Description
Technical Field
The invention relates to the technical field of concrete pouring, in particular to a method for pouring concrete in a cross brace pipe between arch ribs of a steel pipe bridge.
Background
The cross bracing pipe between the steel pipe bridge arch ribs is a structural member for connecting the two steel pipe arch ribs, and the strength, rigidity and stability of the steel pipe arch bridge can be enhanced by the cross bracing pipe after concrete is poured. Generally, a plurality of cross bracing pipe assemblies arranged at intervals are arranged between the steel pipe arch bridges, each cross bracing pipe assembly is formed by connecting two steel pipe arch ribs through a plurality of cross bracing pipes, and inclined web members are arranged between the cross bracing pipes for connection.
The pouring of concrete in the transverse supporting pipe in the prior art is usually to pouring one by one the transverse supporting pipe in each transverse supporting pipe assembly, but when steel pipe arch bridge surrounding environment is comparatively abominable, for example, the steel pipe arch bridge is built between two high mountains, there is frequent process of ship or car in the arch bridge below, adopt single transverse supporting pipe concrete irrigation one by one and can appear the construction cycle length, frequently change the pump line and not only have high altitude construction potential safety hazard to constructor, and cause certain threat to the environment of arch bridge below, therefore, quick, safe, the pouring of the intraductal concrete of transverse supporting among the steel pipe bridge arch rib of stable completion steel pipe bridge has very important meaning.
Disclosure of Invention
The invention aims to: aiming at the technical problems of long construction period and poor safety existing in the pouring method of the concrete in the transverse supporting pipe in the prior art, the pouring method of the concrete in the transverse supporting pipe between the arch ribs of the steel pipe bridge is provided, and the pouring of the concrete can be rapidly, stably and safely completed by adopting the pouring method.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for pouring concrete in transverse supporting pipes among steel pipe bridge arch ribs is characterized in that a plurality of transverse supporting pipe assemblies are arranged among the steel pipe bridge arch ribs at intervals, each transverse supporting pipe assembly comprises n transverse supporting pipes, and two ends of each transverse supporting pipe are respectively connected with two arch ribs of a steel pipe bridge; the n cross support pipes are sequentially the first cross support pipe from bottom to top according to the elevation, n is more than or equal to 2, and n is a natural number; the method comprises the following steps:
step 1, selecting a cross bracing pipe assembly, and sequentially forming two holes at the bottom and the top of each cross bracing pipe in the cross bracing pipe assembly, wherein the two holes are respectively positioned at two ends of each cross bracing pipe, the hole at the bottom of each cross bracing pipe is a grouting hole, and the hole at the top of each cross bracing pipe is a grout discharging hole;
and 3, connecting the concrete conveying pump pipe with the grouting hole of the first cross brace pipe, performing concrete grouting, stopping pumping when the concrete flowing out of the grout discharging hole of the nth cross brace pipe contains aggregate, completing grouting of one cross brace pipe assembly, and grouting concrete of the next cross brace pipe assembly.
The invention discloses a method for pouring concrete in a transverse supporting pipe between arch ribs of a steel pipe bridge, which comprises the steps of firstly, drilling a grouting hole and a grout discharging hole at the bottom and the top of the transverse supporting pipe in each transverse supporting pipe assembly respectively, then communicating the grout discharging holes and the grouting holes of two transverse supporting pipes which are adjacent in height through a pump pipe, so that the transverse supporting pipe assemblies are communicated into a whole, pouring the concrete in the transverse supporting pipes from bottom to top, tightly pouring the concrete in the pipes by virtue of the dead weight and the resistance of the concrete, continuously pouring the concrete once, reducing the operation steps of frequently changing pipes in the pouring process, facilitating the site construction, saving the concrete pouring time, shortening the construction period, improving the safety of the construction and the environment, and aiming at the physical property of the pipe wall of the pump pipe and the path in the conveying process, the inventor purposefully adjusts the performance of the concrete, further reducing the risk of the concrete blocking the pump pipe and enabling the stable filling process.
Furthermore, the cross brace pipe assembly comprises n cross brace pipes, wherein n is more than or equal to 4, and n is a natural number.
Further, in the step 1, in the cross brace pipe assembly, the slurry discharge holes and the slurry filling holes of two adjacent cross brace pipes are located on the same side according to the height. When being in same one side, can increase the convenience of installation pump line, improve the security of construction. Preferably, in the step 1, in the cross brace pipe assembly, according to the height, the straight lines where the grout discharging holes and the grout injecting holes of two adjacent cross brace pipes are located are perpendicular to the axis of the cross brace pipe. Under this kind of condition, the distance of pump line installation is not only shorter, and it is more convenient to install moreover, reduces the construction degree of difficulty, effectively improves the efficiency of construction. Wherein, according to the height, all the cross support pipes in the cross support pipe assembly are arranged from low to high according to the height.
Further, in the step 2, the first pump pipe, the second pump pipe and the n-1 pump pipe are metal structural members. If adopt the pump line of softer material, not only can increase the frictional force of concrete and pipe wall and cause the jam, still can reduce the stability of being connected of pump line and row's thick liquid hole or grout hole. Further, in the step 2, the first pump pipe, the second pump pipe and the n-1 pump pipe are pump pipes which can bear pressure of more than 25 MPa. Preferably, in the step 2, the first pump pipe, the second pump pipe and the n-1 pump pipe are pump pipes which can bear pressure of more than 30 MPa. Further, in the step 2, the first pump pipe, the second pump pipe and the n-1 pump pipe are high-pressure pump pipes.
Further, in the step 2, a grouting hole of the first cross bracing tube is connected with a first connecting tube of 0.5-1 m, and a valve is arranged on the first connecting tube. The first connecting pipe connected with the grouting hole of the first cross bracing pipe is mainly used for externally connecting a concrete conveying pump pipe.
Furthermore, the slurry discharge hole of the nth cross supporting pipe is connected with a second connecting pipe with the diameter of 0.5-1 m.
Further, in step 3, after one of the cross brace pipe assemblies is completely filled, the pump pipe connecting the grouting hole and the grout discharge hole of the adjacent cross brace pipe in the cross brace pipe assembly is removed by the following method: after the concrete in the pipe is hardened, the periphery of the outer wall of the two ends of the pump pipe is cut, and then a small hammer is used for knocking the cut part to break the pump pipe and then the pump pipe is detached. Further, the pump lines are the first, second and n-1 pump lines.
Further, in the step 3, in the concrete pouring process, a main constructor strikes the pipe wall of the transverse supporting pipe to detect the compactness of the concrete pouring.
Furthermore, in the step 3, the concrete in the pipe of the cross-brace pipe is blocked in the concrete pouring process, when the subsequent concrete can not be poured continuously, the pouring is stopped firstly, then, the poured position of the concrete in the pipe is determined according to the poured amount of the concrete, the conveying pump pipe and the amount in the pump truck, then, the small hammer is used for knocking around the position to determine the position of the concrete blockage, an auxiliary hole is formed in the blockage position, the auxiliary hole is connected with the concrete conveying pump pipe, and the concrete pouring in the pipe is continuously performed.
Further, in the step 2, the aperture of the first pump pipe, the second pump pipe and the n-1 pump pipe is not larger than the aperture of the grouting hole and the aperture of the grout discharging hole. Preferably, in the step 2, the aperture of the grouting hole and the aperture of the grout discharging hole are more than or equal to 100 mm. The occurrence of blockage phenomenon in the concrete pouring process and even tube collapse phenomenon is easily caused by the undersize pore diameter, and the safety of the construction process is reduced.
Further, in the step 3, the poured concrete is self-compacting non-shrinkage concrete.
Further, in the step 3, the aggregate refers to coarse and fine aggregate in concrete. The coarse and fine aggregate refers to sand and stone in concrete. In the step 3, sand and stone discharged from the slurry discharge holes are taken as shutdown demarcation points, on one hand, floating slurry is not discharged completely in the filling process, the floating slurry is remained in a concrete structure too much, and the strength of the concrete is weakened if the aggregate is relatively less, so that filling can be guaranteed, materials are saved, and the quality of the concrete filled in the pipe is guaranteed. Preferably, in the step 3, if the laitance is discharged and no aggregate is discharged, the concrete pouring is continued until the aggregate is discharged.
Further, in the step 3, the slump expansion of the poured concrete is less than or equal to 680mm, and the slump expansion loss value is 0 within 2-3 h. Aiming at the addition of the pump pipe, the performance of concrete needs to be effectively adjusted, so that the concrete and the pump pipe realize perfect matching relationship, the slump expansion range provided by the invention is ensured, the flowability of the concrete can be effectively ensured, the proper flowability of the concrete is beneficial to implementation of a pouring process, and the friction and the mutual matching of the concrete and the pipe wall of the pump pipe are reduced, so that the risk of blockage is reduced.
Further, in the step 3, the gas content of the poured concrete is lower than 2.5%. Preferably, in the step 3, the gas content of the poured concrete is 2% to 2.5%. The lower air content can not only improve the stability in the pouring process, but also enable the concrete to be more compact and the construction to be smoother.
Further, in the step 3, the poured concrete is low hydrothermal concrete, and the temperature of the hydrothermal concrete is not higher than 60 ℃. The hydrothermal temperature is too high, so that the concrete is easy to crack after entering the cross brace pipe, and the compactness is reduced.
Furthermore, in the step 3, before pouring concrete, mortar is pumped into the grouting holes of the first cross brace pipes to moisten the pipe walls inside the cross brace pipes and clean dirt.
Furthermore, in the step 3, the concrete is continuously poured in the pouring process without interruption.
Further, in the step 3, the temperature of the concrete is 5 ℃ to 30 ℃.
Further, in the step 3, when the concrete pouring is performed, the pouring is performed at the lowest temperature in one day. When the ambient temperature is too high, the heat of the concrete is absorbed, and the fluidity of the concrete is influenced to a certain extent.
Furthermore, an exhaust hole with the diameter of 15-30 mm is arranged in the midspan position of the top of the cross supporting pipe. Further, when concrete is discharged from the air outlet, the air outlet is blocked by a screw, and finally, after the strength of the concrete reaches the designed strength, the screw at the air outlet is cut and repaired by a grinding machine.
Furthermore, the plurality of cross brace pipe assemblies are poured in a symmetrical mode for pouring construction. The symmetrical mode means that the transverse supporting pipe components are poured one by one from two sides to the middle of the steel pipe arch bridge. The symmetrical construction mode can not only improve the filling speed of the cross supporting pipe of the steel pipe arch bridge, but also improve the stress stability of the steel pipe arch bridge, and is more favorable for the convenient construction.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the invention discloses a method for pouring concrete in a cross brace pipe between arch ribs of a steel pipe bridge, which comprises the steps of firstly drilling a grouting hole and a grout discharging hole at the bottom and the top of the cross brace pipe in each cross brace pipe assembly respectively, and then communicating the grout discharging holes and the grouting holes of two cross brace pipes which are adjacent in height through a pump pipe, so that the cross brace pipe assemblies are communicated into a whole, the concrete can be continuously poured once, the operation steps of frequently changing pipes in the pouring process are reduced, the site construction is convenient, the concrete pouring time is saved, the construction period is shortened, and the safety of construction and environment is also improved.
2. The invention discloses a method for pouring concrete in a transverse supporting pipe between arch ribs of a steel pipe bridge.
3. The invention discloses a method for pouring concrete in a transverse supporting pipe between arch ribs of a steel pipe bridge, which aims at the physical property of the pipe wall of a pump pipe and the path in the conveying process, purposefully adjusts the performance of the concrete, further reduces the risk that the pump pipe is blocked by the concrete, and ensures that the pouring process is stably carried out.
Drawings
FIG. 1 is a schematic view of an environmental position relationship structure of a cross bracing tube between arch ribs of a steel tube bridge.
Fig. 2 shows a first positional relationship between the wale pipe and the pump pipe in the wale pipe assembly during construction.
FIG. 3 shows the position relationship between the cross brace pipe and the pump pipe in the cross brace pipe assembly during construction.
Icon: 1-a rib; 11-a wale tube assembly; 2-a first cross bracing tube; 213-a first pump tube; 21-a first connection pipe; 211-a valve; 3-a second cross bracing tube; 314-a second pump tube; 4-a third cross bracing tube; 415-a third pump tube; 5-a fourth cross bracing tube; 51-a second connecting tube; 6-grouting holes; 7-slurry discharge holes; 9-air vent.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
In a certain steel pipe arch bridge, nine cross-brace pipe assemblies are formed between two arch ribs 1, each cross-brace pipe assembly consists of four cross-brace pipes, and two ends of each cross-brace pipe are respectively connected with the two arch ribs 1 of the steel pipe bridge; four in the every lane stull pipe assembly the stull pipe is according to the elevation from upwards being first stull pipe 2, second stull pipe 3, third stull pipe 4 and fourth stull pipe 5 down in proper order, and the full-bridge counts thirty six stull pipes altogether. Fig. 1 is a schematic structural diagram showing the environmental positional relationship of cross bracing tubes between ribs of a partial steel tube bridge arch, and fig. 2 and 3 can show the elevational positional relationship of four cross bracing tubes in one cross bracing tube assembly.
The bridge site of a certain steel pipe arch bridge construction project is positioned right above a main channel of a scenic spot, if a scheme of pouring concrete into a single cross brace pipe one by one is adopted, the construction period is long, and the safety of passing tourism ships under the bridge is influenced by frequently replacing a pump pipe in the construction process, so that the requirements of construction and environmental protection are not facilitated. In order to quickly and safely finish pouring concrete in the transverse supporting pipe between the steel pipe arches, the following method is innovatively adopted for pouring:
step S1, selecting transverse bracing tube assemblies from two sides of a bridge to construct towards the center of the bridge one by one, and sequentially opening two holes at the bottom and the top of each transverse bracing tube in each transverse bracing tube assembly, wherein the two holes are respectively positioned at two ends of each transverse bracing tube, the hole at the bottom of each transverse bracing tube is a grouting hole 6, and the hole at the top of each transverse bracing tube is a grout discharging hole 7; the relationship between the grout outlet 7 and the grout outlet 6 between the adjacent cross bracing pipes can be as shown in fig. 2 and fig. 3, wherein fig. 3 is a preferred position relationship, the grout outlet 7 and the grout outlet 6 of two adjacent cross bracing pipes are positioned on the same side in the elevation sequencing in fig. 3, and the straight line where the grout outlet 7 and the grout outlet 6 of two adjacent cross bracing pipes are positioned is perpendicular to the cross bracing pipes as shown in fig. 3.
Step S2, as shown in fig. 2 and 3, communicating the grout outlet 7 of the first cross brace pipe 2 to the grout outlet 6 of the second cross brace pipe 3 by using the first pump pipe 213, then communicating the grout outlet 7 of the second cross brace pipe 3 to the grout outlet 6 of the third cross brace pipe 4 by using the second pump pipe 314, and communicating the grout outlet 7 of the third cross brace pipe 4 to the grout outlet 6 of the fourth cross brace pipe 5 by using the third pump pipe 415; the first pump pipe 213, the second pump pipe 314 and the third pump pipe 415 are all high-pressure pump pipes with the diameter of 125mm, the grouting hole 6 of the first cross bracing pipe 2 is connected with a first connecting pipe 21 with the diameter of 0.5m, and the first connecting pipe 21 is provided with a valve 211. The slurry discharge hole 7 of the fourth horizontal supporting pipe 5 is connected with a second connecting pipe 51 of 1 m.
Step S3, connecting a concrete conveying pump pipe with a first connecting pipe 21 of the first cross bracing pipe 2, and performing concrete pouring, wherein in the concrete pouring process, a main constructor knocks the pipe wall of the cross bracing pipe to detect the compactness of the concrete pouring, concrete blockage in the cross bracing pipe occurs in the concrete pouring process, and the subsequent concrete is stopped to be poured before continuing pouring, then the poured position of the concrete in the pipe is determined according to the poured amount of the concrete, the conveying pump pipe and the amount in a pump truck, and then a small hammer knocks around the position to determine the concrete blockage position, and an auxiliary hole is opened at the blockage position to connect the auxiliary hole with the concrete conveying pump pipe to continue the concrete pouring in the pipe; stopping pumping when the concrete flowing out of the slurry discharge hole 7 of the fourth cross bracing tube 5 contains aggregates, completing the pouring of one cross bracing tube assembly, and pouring the concrete of the next cross bracing tube assembly; after the concrete in the poured pipe is hardened, the periphery of the outer walls of the two ends of the pump pipe is cut, and then the cut part is knocked by a small hammer, so that the pump pipe can be broken and detached.
Wherein the slump expansion of the concrete is 680mm, and the slump expansion loss value within 3h is 0. The air content is 2 percent, the hydrothermal temperature is 58 +/-0.5 ℃,
further, an exhaust hole 9 with the diameter of 20mm is arranged at the middle span position of the top of the cross supporting pipe. Further, when concrete is discharged from the exhaust hole 9, the screw is used for blocking, and finally, after the strength of the concrete reaches the designed strength, the screw at the exhaust hole 9 is cut and repaired by a grinding machine.
The invention discloses a method for pouring concrete in a cross support pipe between arch ribs of a steel pipe bridge, which comprises the steps of firstly respectively drilling a grouting hole and a grout discharging hole at the bottom and the top of the cross support pipe in each cross support pipe assembly, then communicating the grout discharging holes and the grouting holes of two cross support pipes adjacent in elevation through a pump pipe, so that the cross support pipe assemblies are communicated into a whole, pouring the concrete in the cross support pipes from bottom to top, enabling the concrete in the pipes to be tightly poured by virtue of the dead weight and the resistance of the concrete, continuously pouring the concrete once, reducing the operation steps of frequently changing pipes in the pouring process, facilitating the site construction, saving the pouring time of the concrete, shortening the construction period, improving the safety of the construction and the environment, and meanwhile, aiming at the physical property of the pipe wall of the pump pipe and the path in the conveying process, the inventor pertinently adjusts the performance of the concrete, further reducing the risk of the concrete blocking the pump pipe and enabling the stable filling process.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. The pouring method of the concrete in the transverse supporting pipes among the arch ribs of the steel pipe bridge is characterized in that a plurality of transverse supporting pipe assemblies are arranged among the arch ribs (1) of the steel pipe bridge at intervals, each transverse supporting pipe assembly comprises n transverse supporting pipes, and two ends of each transverse supporting pipe are respectively connected with two arch ribs (1) of the steel pipe bridge; the n cross support pipes are sequentially a first cross support pipe (2) according to the elevation from bottom to top, wherein n is more than or equal to 2, and n is a natural number; the method comprises the following steps:
step 1, selecting a cross bracing pipe assembly, and sequentially forming two holes at the bottom and the top of each cross bracing pipe in the cross bracing pipe assembly, wherein the two holes are respectively positioned at two ends of each cross bracing pipe, the hole at the bottom of each cross bracing pipe is a grouting hole (6), and the hole at the top of each cross bracing pipe is a grout discharging hole (7);
step 2, communicating a grout discharging hole (7) of the first cross support pipe (2) to a grout filling hole (6) of the second cross support pipe (3) through a first pump pipe (213), then communicating the grout discharging hole (7) of the second cross support pipe (3) to a grout filling hole (6) of the third cross support pipe (4) through a second pump pipe (314), and communicating a grout discharging hole (7) of the n-1 th cross support pipe to a grout filling hole (6) of the n-1 th cross support pipe through an n-1 th pump pipe;
step 3, connecting a concrete delivery pump pipe with a grouting hole (6) of the first cross brace pipe (2) to perform concrete pouring, stopping pumping when the concrete flowing out of a grout discharge hole (7) of the nth cross brace pipe contains aggregate, completing pouring of one cross brace pipe assembly, and pouring concrete of the next cross brace pipe assembly; wherein, the midspan position of the top of the cross bracing tube is provided with an exhaust hole (9) with the diameter of 15-30 mm.
2. The method for pouring concrete in the cross bracing tubes between the steel tube bridge arch ribs according to the claim 1, wherein in the step 1, the grout outlet (7) and the grout inlet (6) of two adjacent cross bracing tubes are positioned at the same side in the height row in the cross bracing tube assembly.
3. The method for pouring concrete in the cross bracing tubes between the steel tube bridge arch ribs according to the claim 2, wherein in the step 1, the cross bracing tube assemblies are arranged in a high level, and the straight lines of the grout discharging holes (7) and the grout injecting holes (6) of two adjacent cross bracing tubes are vertical to the axes of the cross bracing tubes.
4. The method for pouring concrete into a cross brace pipe between steel pipe bridge arch ribs according to claim 1, wherein in step 2, the first pump pipe (213), the second pump pipe (314), and the n-1 pump pipe are pump pipes that can withstand a pressure of 25MPa or more.
5. The method for pouring concrete in a cross brace pipe between steel pipe bridge arch ribs according to claim 1, wherein in the step 2, a first connecting pipe (21) with the thickness of 0.5-1 m is connected to the grouting hole (6) of the first cross brace pipe (2), and a valve (211) is arranged on the first connecting pipe (21).
6. The method for pouring concrete in the cross bracing tube between the steel tube bridge arch ribs according to claim 1, wherein in the step 2, the aperture of the grouting holes (6) and the grout discharging holes (7) is more than or equal to 100 mm.
7. The method for pouring concrete in a cross brace pipe between steel pipe bridge arch ribs according to claim 1, wherein in the step 3, after one cross brace pipe assembly is poured, a pump pipe connecting a grouting hole (6) and a grout discharging hole (7) of the adjacent cross brace pipe in the cross brace pipe assembly is removed by the following method: after the concrete in the pipe is hardened, the periphery of the outer walls of the two ends of the pump pipe is cut, and then the cut part is knocked by a small hammer to break the pump pipe and then the pump pipe is detached.
8. The method for pouring concrete into a cross support tube between steel pipe bridge arch ribs according to claim 1, wherein in the step 3, the slump expansion of the poured concrete is less than or equal to 680mm, and the slump expansion loss value is 0 within 2-3 h.
9. The method for pouring concrete in a cross brace pipe between steel pipe bridge arch ribs according to claim 1, wherein the air content of the poured concrete in the step 3 is less than 2.5%.
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| CN208330405U (en) * | 2018-05-31 | 2019-01-04 | 中铁十七局集团第二工程有限公司 | Balance cloth part flow arrangement for the casting of tunnel double-lining concrete |
| CN208996320U (en) * | 2018-09-18 | 2019-06-18 | 山西二建集团有限公司 | Assembled is connected to chamber grout sleeve more |
| CN109505250A (en) * | 2018-12-07 | 2019-03-22 | 中铁局集团厦门建设工程有限公司 | A kind of filling concrete method of steel tube arch rib |
| CN211714603U (en) * | 2020-01-14 | 2020-10-20 | 中建一局集团建设发展有限公司 | Multi-cavity steel pipe concrete one-step jacking internal pouring interface structure |
| CN111395147A (en) * | 2020-04-28 | 2020-07-10 | 中国十七冶集团有限公司 | Concrete-filled steel tube arch rib with rhombic section |
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| CN112709148A (en) | 2021-04-27 |
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