CN115948993A - Construction method of integral cast-in-place concrete bracket - Google Patents
Construction method of integral cast-in-place concrete bracket Download PDFInfo
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- CN115948993A CN115948993A CN202211648291.6A CN202211648291A CN115948993A CN 115948993 A CN115948993 A CN 115948993A CN 202211648291 A CN202211648291 A CN 202211648291A CN 115948993 A CN115948993 A CN 115948993A
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Abstract
The invention discloses a construction method of an integral cast-in-place concrete corbel bracket, which is characterized by comprising the following steps of: and when the pier column concrete is poured and constructed, the sectional area of the pier column is widened along the bridge direction at the position of the solid section at the top of the pier column, the widening section and the pier column are synchronously and integrally poured, the widening section is taken as a reinforced concrete bracket, and after the concrete strength meets the requirement, a construction support is installed on the reinforced concrete bracket to construct the section 0. The invention has the following characteristics: the construction of the integral cast-in-place concrete bracket directly cancels the installation operation of the embedded rigid support bracket, widens the concrete to be used as a construction platform, improves the stability, ensures the construction quality, shortens the construction period and has obvious economic and social benefits.
Description
Technical Field
The invention relates to a construction technology of a No. 0 section of a continuous rigid frame bridge, in particular to a construction method of an integral cast-in-place concrete corbel bracket.
Background
Along with the gradual development of highway construction wave tides from plain micro-hilly areas to mountain heavy-hilly areas in China, large-span bridges are widely applied due to poor terrain conditions and complex geological structures along the highway in the mountainous areas, and more conditions of crossing valleys and rivers. The continuous rigid frame bridge has large span, beautiful pier column form and relatively high cost compared with arch bridge, suspension bridge and cable-stayed bridge, and is widely used in bridge construction in mountainous area.
The rigid frame bridge is generally mainly composed of a No. 0 section, a standard section, a cast-in-place section and a closure section. At present, aiming at construction of the No. 0 section, a high-altitude support method is mainly adopted for construction. The high-altitude support method is to use pre-embedded rigid brackets, sand cylinders, supports, distribution beams and steel molds (wood molds) of pier columns after construction to carry out support erection, and finish construction operation surfaces of No. 0 sections. The method mainly has the following restriction factors: the accuracy of embedding the bracket key box into the pier stud directly influences the safety and stability of the whole bracket system; the welding (bolting) quality of the rigid support bracket influences the safety of the whole bracket; because the large rigid support bracket belongs to high-altitude operation, the installation risk of the large rigid support bracket is higher; the installation and removal period is long, and the construction progress is influenced; in the construction process, errors exist in the settlement observation of the rigid support bracket.
Chinese patent 201620376340.9 discloses a No. 0 section support of rigid frame bridge, including setting up a plurality of assembled brackets in the pier stud both sides, the bottom card of assembled bracket is gone into in the embedded groove on the pier stud, be provided with a sand section of thick bamboo on the roof of assembled bracket, several main longerons have been placed on the sand section of thick bamboo of every side, several main longeron top intermediate position departments are provided with a pad reinforcing bar, connect through horizontal overload roof beam between the pad reinforcing bar of pier stud both sides, be provided with end die system and other mounting system on horizontal overload roof beam. The bracket adopts the assembled bracket, and the construction process is simplified, but the bracket still needs to be operated aloft.
Disclosure of Invention
The invention aims to provide a construction method of an integrally cast-in-place concrete corbel bracket. The installation operation of the pre-buried rigid support bracket is cancelled, so that a construction process with the maximum safety risk of operators is avoided, and the overhead working capacity is greatly reduced.
The technical scheme of the invention is as follows: a construction method for an integrally cast-in-place concrete bracket comprises the steps of widening the sectional area of a pier column along the bridge direction at the position of a solid section at the top of the pier column while pouring pier column concrete, synchronously integrally pouring a widening section and the pier column, taking the widening section as a reinforced concrete bracket, and installing a construction bracket on the reinforced concrete bracket after the concrete strength meets the requirement to construct a section 0.
According to the construction method of the integral cast-in-place concrete bracket, the width of the widening section is increased by 40-80 cm on each of two sides of the solid section of the pier top.
According to the construction method of the integral cast-in-place concrete bracket, the width of the widening section is increased by 50-70 cm on each of two sides of the solid section of the pier top.
According to the construction method of the integral cast-in-place concrete bracket, the upper part and the lower part of the outer side of the pier stud are the same in width, and the reinforced concrete bracket is poured on the outer side.
The construction method of the integral cast-in-place concrete bracket comprises the following specific steps: 1. setting the height of a reinforced concrete bracket according to a drawing during pier column construction, and lofting the reinforced concrete bracket;
2. pouring solid sections of the pier columns and reinforced concrete corbel concrete;
3. mounting a No. 0 beam section bracket on the reinforced concrete bracket;
4. prepressing the No. 0 beam section bracket;
5. erecting a mould on the support, and binding reinforcing steel bars;
6. positioning longitudinal, transverse and vertical prestressed pipelines, and pre-burying vertical prestressed steel bundles;
7. pouring No. 0 concrete, and demolding after the required age is reached;
8. after the strength of the concrete reaches 95% of the designed strength and the age is not less than 5 days, symmetrically tensioning No. 0 beam sections corresponding to the longitudinal steel bundles, and anchoring and grouting;
9. tensioning and anchoring the transverse and vertical prestressed reinforcements of the No. 0 beam section;
10. and finishing construction of the No. 0 beam section.
The invention has the beneficial effects that: the invention has the following characteristics:
safety feature
1. The construction of the integral cast-in-place concrete bracket directly cancels the installation operation of the embedded rigid support bracket, avoids one construction process with the maximum safety risk of operators, greatly reduces the overhead working amount and reduces the safety management risk of projects.
2. The pier top working area is increased, the widened concrete part can be used as a construction platform, a subsequent support system is installed, the safety protection effect is achieved, the investment is reduced, and the risk is reduced.
3. The integral concrete bracket improves the stability of the support, and reduces the local stress concentration of the support caused by the installation error of the rigid bracket support, thereby influencing the construction safety.
Quality characteristics
1. The problem of influencing pier stud quality due to eccentric compression of pier studs caused by uneven stress between piers and beside the piers in the construction process of No. 0 section of the steel support bracket is avoided.
2. Because the whole concrete steel support is adopted, the settlement observation of the whole bracket system is more convenient, the construction mode can be timely adjusted in the construction process, and the whole construction quality is ensured.
Characteristics of construction period
1. Concrete bracket and pier stud are whole to be pour, save rigid support bracket installation time, are convenient for on-the-spot progress control management.
2. The time for welding and bolting the rigid support is shortened, the working efficiency is improved, and the construction period is effectively shortened.
The economic and social benefits of the technology of the invention are as follows:
the construction process of the integral cast-in-place concrete bracket of the No. 0 section of the continuous rigid frame bridge greatly shortens the construction period, reduces the on-site management cost investment of construction enterprises, and improves the utilization rate of equipment.
Taking a certain project as an example, the comprehensive benefits of the construction method are used for analysis, and compared with the traditional high-altitude support method, the construction period is shortened by 45 days, and the construction cost is shortened. Specific benefits are given in the following table
TABLE 1 statistical table of economic benefits
According to economic benefit comparative analysis, construction cost of construction of a single No. 0 section is saved by 23.46 ten thousand yuan. If the construction method is popularized to the field of construction of No. 0 section engineering of a continuous rigid frame bridge, the economic benefit is quite huge.
With the acceleration of the advancement of socialist modernization infrastructure construction in China, the continuous rigid frame bridge with low bridge cost, safety and applicability can be widely applied to western mountainous areas, and the construction method can be popularized and applied to the construction of continuous rigid frame bridges in future.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the construction state of the present invention.
Detailed Description
The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention.
Example 1 of the invention: a construction method of an integrally cast-in-place concrete bracket comprises the steps of widening the sectional area of a pier column along the bridge direction at the position of a solid section of the pier top of the pier column 1 during pouring of pier column concrete, synchronously integrally pouring a widening section and the pier column, taking the widening section as a reinforced concrete bracket 2, installing a construction bracket 5 on the reinforced concrete bracket 2 after the concrete strength meets the requirement, and constructing a No. 0 section by adopting structures such as a main beam, a secondary distribution beam, a longitudinal support beam, a plate opening bracket and the like.
The width of each widening section is increased by 40-80 cm at two sides of the solid section at the top of the pier, so that a main beam is convenient to install. More preferably, the width of the widening section is increased by 50-70 cm on both sides of the position of the solid section on the pier top. Furthermore, the width of the widening section is increased by 60 cm at two sides of the solid section of the pier top, so that the widening section is suitable for installation and construction of the sand cylinder 3 and the longitudinal beam 4.
The reinforced concrete corbel 2 is poured to the same width about the outside of pier stud 1, and the same width about the outside of pier stud 1, the installation is pre-buried corbel degree of difficulty is bigger, more is applicable to reinforced concrete corbel 2. As shown in fig. 1 and 2, the reinforced concrete corbel 2 may be trapezoidal or rectangular.
The method comprises the following specific steps: 1. setting the height of a reinforced concrete bracket according to a drawing during pier column construction, and lofting the reinforced concrete bracket;
2. pouring concrete of a solid section of the pier stud 1 and the reinforced concrete bracket 2;
3. a No. 0 beam section bracket is arranged on the reinforced concrete bracket 2; the sand cylinder 3 is arranged on the reinforced concrete corbel 2, the bearing longitudinal beam 4 is welded by adopting I-shaped steel I56a, and the longitudinal beam 4 is arranged on the sand cylinder 3. And adopt phi 32 finish-rolling screw-thread steel to draw to, prevent that main beam from appearing sliding, strengthen overall stability, ensure support safety. And a support 5 for construction is arranged on the longitudinal beam 4 and comprises a main beam, a secondary distribution beam, a longitudinal support beam, a plate opening support and the like, and a bottom die is paved after the secondary distribution beam is arranged.
4. Prepressing the No. 0 beam section bracket; the pre-compaction adopts sand section of thick bamboo 3, and each sand section of thick bamboo 3 carries out the pre-compaction according to 120 tons, carries out the pre-compaction to the sand section of thick bamboo through the laboratory press, loads step by step according to 20% → 60% → 80% → 100%, and each grade of load reaches and loads next level load after stabilizing, and until pre-compaction maximum load, the compression value under the determined load effect measures the sand section of thick bamboo and satisfies the dress sand height under the maximum pressure.
The sand cylinder 3 is made as follows: the outer diameter of the upper cylinder is 440mm, the wall thickness of the upper cylinder is 10mm, the height of the upper cylinder is 150mm, and C50 concrete is poured into the upper cylinder; the lower sand cylinder is a steel pipe with the outer diameter of 480mm and the wall thickness of 10mm, the height of 190mm, the top plate and the bottom plate of the sand cylinder are made of steel plates with the thickness of 10mm and the thickness of 500 x 500mm, the bottom of the sand cylinder is provided with a phi 30mm sand unloading hole, and the lower sand cylinder is filled with selected engineering sand (the sand cylinder does not need to be clean and mud, and is screened after being dried, and fine sand with the particle size of 1.6-2.5 mm is selected). When the frame falls, the bolts close to the bottom of the lower cylinder are loosened to draw out the sand, so that the main beam falls down, and the beam mold is disassembled.
5. Erecting a mould on the bracket 5, and binding steel bars;
6. positioning longitudinal, transverse and vertical prestressed pipelines, and embedding vertical prestressed steel bundles;
7. pouring No. 0 concrete, and demolding after the required age is reached;
8. after the strength of the concrete reaches 95% of the designed strength and the age is not less than 5 days, symmetrically tensioning No. 0 beam sections corresponding to the longitudinal steel bundles, and anchoring and grouting; (after the pre-stress tension is finished, the special grouting material is timely poured into the pre-stress pipeline by adopting vacuum auxiliary grouting, the same is carried out below).
9. Tensioning and anchoring transverse and vertical prestressed reinforcements of the No. 0 beam section (delaying the tensioning transverse and vertical prestressed reinforcements of 2 beam sections);
10. and finishing construction of the No. 0 beam section.
Example 2 of the invention: a construction method of an integrally cast-in-place concrete bracket comprises the steps of widening the sectional area of a pier column along the bridge direction at the position of a solid section of the pier top of the pier column 1 during pouring of pier column concrete, synchronously integrally pouring a widening section and the pier column, taking the widening section as a reinforced concrete bracket 2, installing a construction bracket 5 on the reinforced concrete bracket 2 after the concrete strength meets the requirement, and constructing a No. 0 section by adopting structures such as a main beam, a secondary distribution beam, a longitudinal support beam, a plate opening bracket and the like.
The width of each widening section is increased by 60 cm at two sides of the solid section at the top of the pier, and the widening section is suitable for installation and construction of the sand cylinder 3 and the longitudinal beam 4.
The outer side of the pier stud 1 is the same width from top to bottom, a reinforced concrete bracket 2 is poured on the outer side, and the reinforced concrete bracket 2 is rectangular.
The method comprises the following specific steps: 1. setting the height of a reinforced concrete bracket according to a drawing during pier column construction, and lofting the reinforced concrete bracket;
2. pouring concrete of the solid section of the pier stud 1 and the reinforced concrete bracket 2 until the strength of the concrete meets the requirement;
3. a No. 0 beam section bracket is arranged on the reinforced concrete corbel 2; the sand cylinder 3 is arranged on the reinforced concrete corbel 2, the bearing longitudinal beam 4 is welded by adopting I-shaped steel I56a, and the longitudinal beam 4 is arranged on the sand cylinder 3. And adopt phi 32 finish-rolling screw-thread steel to draw to, prevent that main beam from appearing sliding, strengthen overall stability, ensure support safety. And the longitudinal beam 4 is provided with a support 5 for construction, which comprises a main beam, a secondary distribution beam, a longitudinal support beam, a plate opening support, a protective guard, a construction platform and the like.
4. Prepressing the No. 0 beam section bracket; the pre-compaction adopts sand section of thick bamboo 3, and each sand section of thick bamboo 3 carries out the pre-compaction according to 120 tons, carries out the pre-compaction to the sand section of thick bamboo through the laboratory press, loads step by step according to 20% → 60% → 80% → 100%, and each grade of load reaches and loads next level load after stabilizing, and until pre-compaction maximum load, the compression value under the determined load effect measures the sand section of thick bamboo and satisfies the dress sand height under the maximum pressure.
The sand cylinder 3 is made as follows: the outer diameter of the upper cylinder is 440mm, the wall thickness of the upper cylinder is 10mm, the height of the upper cylinder is 150mm, and C50 concrete is poured into the upper cylinder; the sand discharging cylinder is a steel pipe with the outer diameter of 480mm and the wall thickness of 10mm, the height of 190mm, the top plate and the bottom plate of the sand discharging cylinder are made of steel plates with the thickness of 10mm and the thickness of 500mm multiplied by 500mm, the bottom of the sand discharging cylinder is provided with a phi 30mm sand discharging hole, and fine engineering sand (which is clean and does not need mud, is dried and then is screened and fine sand with the particle size of 1.6-2.5 mm is selected) is filled in the sand discharging cylinder. When the frame falls, the bolts close to the bottom of the lower cylinder are loosened to draw out the sand, so that the main beam falls down, and the beam mold is disassembled.
5. Erecting a mould on the bracket 5, and binding reinforcing steel bars;
6. positioning longitudinal, transverse and vertical prestressed pipelines, and pre-burying vertical prestressed steel bundles;
7. pouring No. 0 concrete, and demolding after the required age is reached;
8. after the strength of the concrete reaches 95% of the designed strength and the age is not less than 5 days, symmetrically tensioning No. 0 beam sections corresponding to the longitudinal steel bundles, and anchoring and grouting; (after the pre-stress tension is finished, the special grouting material is timely poured into the pre-stress pipeline by adopting vacuum auxiliary grouting, the same is carried out below).
9. Tensioning and anchoring the horizontal and vertical prestressed reinforcements of the No. 0 beam section (2 beam section tensioning horizontal and vertical prestressing force is lagged);
10. and finishing construction of the No. 0 beam section.
Claims (5)
1. The construction method of the integral cast-in-place concrete bracket is characterized by comprising the following steps of: when the pier column concrete pouring construction is carried out, the section area of the pier column is widened along the bridge direction at the position of the pier top solid section of the pier column, the widening section and the pier column are synchronously and integrally poured, the widening section is used as a reinforced concrete bracket, and after the concrete strength meets the requirement, a construction support is installed on the reinforced concrete bracket, and the construction of the No. 0 section is carried out.
2. The construction method of the integral cast-in-place concrete corbel bracket according to claim 1, characterized in that: the width of the widening section is increased by 40-80 cm on two sides of the solid section on the top of the pier respectively.
3. The construction method of the integral cast-in-place concrete corbel bracket according to claim 1, characterized in that: the width of the widening section is increased by 50-70 cm on each side of the pier top solid section.
4. The construction method of the integral cast-in-place concrete corbel bracket according to claim 1, characterized in that: the outer sides of the pier columns are the same in width up and down, and reinforced concrete corbels are poured on the outer sides.
5. The construction method of the integral cast-in-place concrete corbel bracket according to claim 1, characterized in that: the method comprises the following specific steps: 1. setting the height of a reinforced concrete bracket according to a drawing during pier column construction, and lofting the reinforced concrete bracket;
2. pouring solid sections of the pier columns and reinforced concrete corbel concrete;
3. mounting a No. 0 beam section construction support on the reinforced concrete bracket;
4. prepressing the construction support of the No. 0 beam section;
5. erecting a mould on the construction support, and binding reinforcing steel bars;
6. positioning longitudinal, transverse and vertical prestressed pipelines, and pre-burying vertical prestressed steel bundles;
7. pouring No. 0 concrete, and demolding after the required age is reached;
8. after the strength of the concrete reaches 95% of the designed strength and the age is not less than 5 days, symmetrically tensioning No. 0 beam sections corresponding to the longitudinal steel bundles, and anchoring and grouting;
9. tensioning and anchoring the transverse and vertical prestressed reinforcements of the No. 0 beam section;
10. and finishing construction of the No. 0 beam section.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117433822A (en) * | 2023-12-20 | 2024-01-23 | 贵州省公路工程集团有限公司 | Structural performance evaluation system and method using reinforced concrete bracket as support |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117433822A (en) * | 2023-12-20 | 2024-01-23 | 贵州省公路工程集团有限公司 | Structural performance evaluation system and method using reinforced concrete bracket as support |
| CN117433822B (en) * | 2023-12-20 | 2024-02-13 | 贵州省公路工程集团有限公司 | Structural performance evaluation system and method using reinforced concrete bracket as support |
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