CN111648249A - Construction method for jacking arch rib concrete of steel pipe tied arch bridge - Google Patents
Construction method for jacking arch rib concrete of steel pipe tied arch bridge Download PDFInfo
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- CN111648249A CN111648249A CN202010513759.5A CN202010513759A CN111648249A CN 111648249 A CN111648249 A CN 111648249A CN 202010513759 A CN202010513759 A CN 202010513759A CN 111648249 A CN111648249 A CN 111648249A
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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
A construction method for jacking arch rib concrete of a steel pipe tied arch bridge. The method comprises the steps of concrete jacking preparation work, the mix proportion of concrete, the arrangement of concrete pump pipes, concrete jacking construction, abnormal condition treatment measures and the like. The construction method for jacking the concrete of the arch rib of the steel pipe tied arch bridge, provided by the invention, has the advantages that the operation process and the used equipment are simple, the construction is carried out without erecting a scaffold, the compactness of the concrete in the arch rib can be ensured by combining a high-pressure concrete pump truck with an effective construction method, and the safety of construction operation is enhanced. The construction risk is reduced, and the operation efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of railway engineering construction, and particularly relates to a construction method for jacking arch rib concrete of a steel pipe tied arch bridge.
Background
In recent years, China is developing the railway transportation industry vigorously, and China high-speed rails enter a leap-type development stage. The steel pipe tied arch bridge is widely applied to high-speed rail construction, is a bridge structure form with strong spanning capability, beautiful appearance and more applications, and integrates the advantages of an arch and a beam. In the process of building the steel pipe tied-arch bridge, concrete is poured into the arch ribs of the steel pipe tied-arch bridge as a key link of construction, so that the construction quality of the steel pipe tied-arch bridge is related to the bearing stress condition of the whole steel pipe tied-arch bridge and the service life of the whole main bridge. When concrete construction in the arch rib is carried out in the past, a method of erecting a platform by means of a scaffold is often adopted, concrete is poured into an opening at the highest point of the arch rib, obviously, the construction overhead work is more, the labor intensity is high, the compactness cannot be controlled in the concrete pouring process, and the construction effect is not good. The construction risk is higher, and the security is difficult to guarantee.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a construction method for jacking the arch rib concrete of a steel pipe tied arch bridge.
In order to achieve the purpose, the construction method for jacking the arch rib concrete of the tied arch bridge of the steel pipe provided by the invention comprises the following steps in sequence:
1) preparation work
Sprinkling water on the arch rib of the concrete to be poured by using a waterwheel; before the arch rib is hoisted, a pouring hole, an exhaust hole and a grout outlet are formed on the arch rib; the symmetrical parts of the arch feet at the two ends of each side arch rib are respectively provided with a filling hole, a filling pipe is connected at the filling hole, and the middle position of the filling pipe is provided with a grout stop valve for preventing the concrete from flowing back; a pulp outlet hole and an exhaust hole are arranged in the middle of the arch rib span; a plastic hose is connected at the grout-bleeding hole; then connecting a plurality of sections of concrete conveying pump pipes between the pump truck and the filling pipe; determining the type of concrete to be poured into the arch rib;
2) jacking construction
The arch rib adopts a full-span symmetrical continuous pouring mode from arch feet at two ends; firstly, pumping mortar into the arch rib through a concrete delivery pump pipe and a filling pipe by using a pump truck through a filling hole to lubricate a delivery pipeline, and then pumping concrete; during pouring, two pouring holes of arch feet at two ends of an arch rib are knocked by a constructor with a rubber hammer respectively to check the positions where concrete reaches, when the concrete poured from the two ends is about to converge, the pouring speed of the two ends is controlled, so that the concrete at the two sides slowly and symmetrically rises until the concrete poured from the two ends converges; then, the simultaneous pouring mode of the two pump trucks is changed into an alternate pouring mode so as to reduce the pressure of the concrete on the arch rib; air in the arch rib is exhausted outwards through the exhaust holes; the grout outlet and the plastic hose can guide the mortar discharged by the concrete to the lower part of the bridge so as to avoid polluting the arch rib and the bridge floor; stopping pumping when the mortar discharged from the mortar discharging hole contains broken stones, and closing the mortar stop valve; when the strength of concrete in the arch rib reaches 80% of the design strength, removing the filling pipe and the plastic hose on the arch rib, sealing the filling hole, the exhaust pipe and the grout outlet, and finally coating paint;
3) abnormal situation handling measures
When the pipe blockage symptom appears in the concrete conveying pump pipe, the reverse pump operation is frequently carried out, a part of concrete in the concrete conveying pump pipe is sucked back into the hopper, and the pipe blockage can be usually eliminated; if the concrete conveying pump pipe is not in operation, the positive pump-reverse pump operation is carried out, and other constructors can search pipe blockage positions along the concrete conveying pump pipe or beat and judge by using a wood hammer; the blocked aggregate can be broken down and restored to be smooth sometimes by knocking the pipe blocking part with a wooden hammer; if the knocking is invalid, the pipe fitting of the blocking section is detached, the pipe fitting is restored to the original shape after the concrete is removed, and then the pumping can be continued;
when the arch rib pipe blockage occurs, firstly, the operation of a positive pump and a reverse pump is repeated, whether the concrete in the arch rib can be dredged or not is tried, the rubber hammer is used for knocking the arch rib to judge the position of the pipe blockage, a filling hole is formed in the position of about 0.5m above the pipe blockage position through manual gas cutting, the filling pipe with a grout stop valve is immediately welded to serve as a spare pipeline, and the spare pipeline is used for continuing filling.
In the step (1), the perfusion tube is a steel tube with the outer diameter of 150mm, and forms an angle of 30 degrees with the axis of the arch rib; the diameter of the vent hole is 32mm, and the diameter of the slurry outlet hole is 159 mm.
In the step (1), the concrete is C50 non-shrinkage steel fiber concrete with the volume content of 0.8 percent.
The construction method for jacking the concrete of the arch rib of the steel pipe tied arch bridge, provided by the invention, has the advantages that the operation process and the used equipment are simple, the construction is carried out without erecting a scaffold, the compactness of the concrete in the arch rib can be ensured by combining a high-pressure concrete pump truck with an effective construction method, and the safety of construction operation is enhanced. The construction risk is reduced, and the operation efficiency is improved.
Drawings
FIG. 1 is a process flow chart of a construction method for jacking arch rib concrete of a steel pipe tied arch bridge provided by the invention.
Detailed Description
The construction method for jacking the arch rib concrete of the tied arch bridge with steel pipes provided by the invention is described in detail below with reference to the accompanying drawings and specific embodiments.
Now, a high-speed rail project is taken as an example for explanation: the high-speed rail engineering crosses urban streets and adopts a 1-56m simple tied arch form, and the main pier is a 0# table and a 1# pier. The arch bridge plane is located on the straight line, the longitudinal section is located on the longitudinal slope with i ═ 15 ‰, the construction scheme of beam first and then arch is adopted, and the bridge deck longitudinal slope is realized through rigid rotation of arch ribs and beam portions.
The main bridge adopts a combined structure system of a prestressed concrete continuous beam and a steel pipe concrete stiffening arch. The arch axis adopts a quadratic parabola, the span is 56m, the rise is 14m, the rise-to-span ratio is 1: 4. the arch rib adopts a dumbbell-shaped concrete-filled steel tube section. The outer diameter of the steel pipe is 1m, the total height of the arch rib is 2.3m, and the upper steel pipe, the lower steel pipe and the abdominal cavity are filled with compensation shrinkage concrete. The center distance between two arch ribs is 14.2 m. C50 non-shrinkage steel fiber concrete (volume content is 0.8%) is adopted in the designed arch rib of the bridge, the filling is sequentially carried out according to the sequence of lower pipe, upper pipe and web plate, the next filling is carried out when the age of the concrete poured at the last time is not less than 5 days and the strength reaches 100%.
As shown in fig. 1, the construction method for jacking the arch rib concrete of the tied arch bridge of the steel pipe provided by the invention comprises the following steps in sequence:
1) preparation work
The method has the advantages that water is sprayed on the arch ribs of the concrete to be poured by the aid of the water spraying vehicle, so that the temperature of the arch ribs is reduced, the requirement of design pouring temperature is met, weather forecast is checked in advance, and site construction is organized reasonably according to weather.
And secondly, debugging the pump truck before the perfusion premise so as to keep the pump truck in a good state, and installing lighting facilities on site.
Arrangement of filling hole, exhaust hole and slurry emitting hole
Before the arch rib is hoisted, a pouring hole, an exhaust hole and a grout outlet are formed on the arch rib; the symmetrical parts of the arch feet at the two ends of each side of the arch rib are respectively provided with a filling hole, the filling hole is connected with a filling pipe, the filling pipe is a steel pipe with the outer diameter of 150mm and forms an angle of 30 degrees with the axis of the arch rib, and the middle position of the filling pipe is provided with a grout stop valve for preventing the concrete from flowing back; a pulp outlet hole and an exhaust hole are arranged in the middle of the arch rib span; the diameter of the exhaust hole is 32mm, and the diameter of the slurry outlet hole is 159 mm; a plastic hose is connected with the grout outlet.
Arrangement of pump pipe
A plurality of sections of concrete conveying pump pipes are connected between the pump truck and the filling pipe; the concrete pump delivery pipe adopts the diameter to be 150mm high-pressure pipe, on the position of pouring hole and concrete pump delivery pipe line way, sets up the support and is used for erectting concrete pump delivery pipe specially to guarantee the steadiness of pipeline, and minimize the elbow. Before each section of concrete conveying pump pipe is butted, whether the inner wall of the concrete conveying pump pipe is clean or not and whether a joint and a sealing ring are intact are carefully checked so as to ensure that the phenomena of blockage, burst and leakage cannot occur in the pumping process. After butt joint, the concrete conveying pump pipe is required to be checked section by section to ensure tight pipe joint interface and avoid pipe falling in the concrete jacking process. In addition, in order to prevent accidents, a set of concrete conveying pump pipes, elbows and sealing rings with the same length and number are prepared on site as a spare, and the replacement of the spare concrete conveying pump pipes needs to be tested and mastered. After the concrete conveying pump pipe is installed, people are prohibited from walking on the concrete conveying pump pipe.
Arc rib concrete
The type of concrete that needs to be poured into the arch rib is determined. According to the invention, the C50 non-shrinkage steel fiber concrete (volume content is 0.8%) is adopted, various dosage ratio tests and performance tests are carried out on various materials in a laboratory, and the theoretical dosage ratio is as follows according to the requirements of large slump, good workability, no bleeding, shrinkage compensation and the like:
cement: fly ash: steel fiber: sand: crushing stone: water reducing agent: swelling agent: water 390: 64: 63: 732: 1053: 4.9: 40: 153.
the slump range is preferably within
The degree of expansion is preferably controlled in
The T500 time is preferably controlled to
The passing time of the V-shaped funnel is controlled at
The U-shaped box fill height test is preferably greater than 30 cm. The slump loss after 3 hours is preferably controlled to be less than 3 cm.
The mixing plant should be prepared in advance to ensure the timely supply of concrete.
Sixthly, type selection configuration of pumping equipment
① Pumping speed 30m3/h；
Pumping height: the construction of the bridge is considered according to 16m, and the delivery pump head is generally 1.5 times of the pumping height, namely 24 m.
Pumping horizontal distance: the bridge pump truck is positioned near two arch feet, and the horizontal distance is considered as 6 m.
Diameter of a delivery pump pipe: 125 mm.
Controlling concrete slump: 220mm
According to the parameters and a mechanical manual is searched, the pump pressure of the delivery pump needs to be more than 1MPa, the lift is not less than 24m, the HBT90 type drag concrete delivery pump is determined, and the pump truck which meets the requirements and is in a good state can be selected according to actual conditions before pouring.
Pumping equipment and its capacity requirements: and 4 high-pressure fixed concrete delivery pumps (1 spare pump) are arranged at two ends of each pump to synchronously pump at each time. Each pump truck pumps 30m of the fuel per hour on average3Concrete, taking into account some other factors, each rib is planned to complete pumping within 2 hours.
2) Jacking construction
The arch rib adopts a full-span symmetrical continuous pouring mode from arch feet at two ends, and the process from concrete mixing to jacking is controlled to be completed completely before initial setting of concrete.
Before pouring, the concrete consumption of a single arch rib needs to be calculated, concrete transportation is organized, and jacking can be carried out after the required concrete is conveyed to a construction site, so that jacking interruption caused by delay in the transportation process of the concrete is prevented. And meanwhile, the detection of the concrete slump and the slump expansion degree on site is made in time.
Firstly, pumping mortar into the arch rib through a concrete delivery pump pipe and a filling pipe by using a pump truck through a filling hole to lubricate a delivery pipeline, and then pumping concrete; during pouring, two pouring holes of arch feet at two ends of an arch rib are knocked by a constructor with a rubber hammer respectively to check the positions where concrete reaches, when the concrete poured from the two ends is about to converge, the pouring speed of the two ends is controlled, so that the concrete at the two sides slowly and symmetrically rises until the concrete poured from the two ends converges; then, the simultaneous pouring mode of the two pump trucks is changed into an alternate pouring mode so as to reduce the pressure of the concrete on the arch rib; air in the arch rib is exhausted outwards through the exhaust holes; the grout outlet and the plastic hose can guide the mortar discharged by the concrete to the lower part of the bridge so as to avoid polluting the arch rib and the bridge floor; stopping pumping when the mortar discharged from the mortar discharging hole contains broken stones, and closing the mortar stop valve;
in the process of pouring, the pressure condition of the pump truck is noticed at any time, for example, the height is consistent, when the pump pressure difference is large, the reason should be checked, the fault is eliminated or a pouring hole is additionally arranged to continue the concrete jacking, and the faster the measures are taken, the better the concrete jacking is.
When the strength of concrete in the arch rib reaches 80% of the design strength, removing the filling pipe and the plastic hose on the arch rib, sealing the filling hole, the exhaust pipe and the grout outlet, and finally coating paint;
3) abnormal situation handling measures
(1) Concrete conveying pump pipe blocking pipe
When the sign of pipe blockage appears in the concrete conveying pump pipe, measures should be taken in time to prevent the pipe blockage. Under normal conditions, the maximum pump oil pressure does not reach the set pressure. If the pumping oil pressure quickly reaches the set pressure, the normal pumping circulation automatically stops, and the overflow sound is sent by the overflow valve of the main oil way, so that the pipe blockage is indicated. At this time, the reverse pump operation can be frequently carried out, so that a part of the concrete in the concrete conveying pump pipe is sucked back into the hopper, and the pipe blockage can be usually eliminated. If not, the plugging is already explained. At the moment, while performing positive pump-reverse pump operation, other constructors are allowed to search for a pipe blockage part along the concrete conveying pump pipe, generally, from the outlet of a pump truck, the part without pipe blockage can vibrate violently, the concrete conveying pump pipe behind the pipe blockage part is static, and the judgment can be carried out by knocking with a wooden hammer; the blocked aggregate can be broken down and restored to be smooth by beating the blocked pipe part with a wooden hammer. If the pipe is not effective in knocking, the pipe fitting of the blocking section can be detached, the pipe fitting is recovered to the original shape after concrete is removed, and pumping can be continued.
(2) Arch rib blocking pipe
(ii) preventive measures
And performing a slump test after the concrete arrives at the field, after the test is qualified, pumping after the slump and the fluidity meet the requirements, ensuring that one-time continuous pouring is finished in the pumping process, ensuring the supply of the concrete, and easily causing the pipe blockage of the arch rib once the jacking of the concrete is stopped in the middle.
② measures for treating pipe blockage
When the arch rib pipe blockage occurs, firstly, the operation of a positive pump and a reverse pump is repeated, whether the concrete in the arch rib can be dredged or not is tried, the rubber hammer is used for knocking the arch rib to judge the position of the pipe blockage, a filling hole is formed in the position of about 0.5m above the pipe blockage position through manual gas cutting, the filling pipe with a grout stop valve is immediately welded to serve as a spare pipeline, and the spare pipeline is used for continuing filling.
Claims (3)
1. A construction method for jacking arch rib concrete of a steel pipe tied arch bridge is characterized by comprising the following steps: the construction method comprises the following steps in sequence:
1) preparation work
Sprinkling water on the arch rib of the concrete to be poured by using a waterwheel; before the arch rib is hoisted, a pouring hole, an exhaust hole and a grout outlet are formed on the arch rib; the symmetrical parts of the arch feet at the two ends of each side arch rib are respectively provided with a filling hole, a filling pipe is connected at the filling hole, and the middle position of the filling pipe is provided with a grout stop valve for preventing the concrete from flowing back; a pulp outlet hole and an exhaust hole are arranged in the middle of the arch rib span; a plastic hose is connected at the grout-bleeding hole; then connecting a plurality of sections of concrete conveying pump pipes between the pump truck and the filling pipe; determining the type of concrete to be poured into the arch rib;
2) jacking construction
The arch rib adopts a full-span symmetrical continuous pouring mode from arch feet at two ends; firstly, pumping mortar into the arch rib through a concrete delivery pump pipe and a filling pipe by using a pump truck through a filling hole to lubricate a delivery pipeline, and then pumping concrete; during pouring, two pouring holes of arch feet at two ends of an arch rib are knocked by a constructor with a rubber hammer respectively to check the positions where concrete reaches, when the concrete poured from the two ends is about to converge, the pouring speed of the two ends is controlled, so that the concrete at the two sides slowly and symmetrically rises until the concrete poured from the two ends converges; then, the simultaneous pouring mode of the two pump trucks is changed into an alternate pouring mode so as to reduce the pressure of the concrete on the arch rib; air in the arch rib is exhausted outwards through the exhaust holes; the grout outlet and the plastic hose can guide the mortar discharged by the concrete to the lower part of the bridge so as to avoid polluting the arch rib and the bridge floor; stopping pumping when the mortar discharged from the mortar discharging hole contains broken stones, and closing the mortar stop valve; when the strength of concrete in the arch rib reaches 80% of the design strength, removing the filling pipe and the plastic hose on the arch rib, sealing the filling hole, the exhaust pipe and the grout outlet, and finally coating paint;
3) abnormal situation handling measures
When the pipe blockage symptom appears in the concrete conveying pump pipe, the reverse pump operation is frequently carried out, a part of concrete in the concrete conveying pump pipe is sucked back into the hopper, and the pipe blockage can be usually eliminated; if the concrete conveying pump pipe is not in operation, the positive pump-reverse pump operation is carried out, and other constructors can search pipe blockage positions along the concrete conveying pump pipe or beat and judge by using a wood hammer; the blocked aggregate can be broken down and restored to be smooth sometimes by knocking the pipe blocking part with a wooden hammer; if the knocking is invalid, the pipe fitting of the blocking section is detached, the pipe fitting is restored to the original shape after the concrete is removed, and then the pumping can be continued;
when the arch rib pipe blockage occurs, firstly, the operation of a positive pump and a reverse pump is repeated, whether the concrete in the arch rib can be dredged or not is tried, the rubber hammer is used for knocking the arch rib to judge the position of the pipe blockage, a filling hole is formed in the position of about 0.5m above the pipe blockage position through manual gas cutting, the filling pipe with a grout stop valve is immediately welded to serve as a spare pipeline, and the spare pipeline is used for continuing filling.
2. The construction method for jacking the arch rib concrete of the steel pipe tied arch bridge according to claim 1, wherein: in the step (1), the perfusion tube is a steel tube with the outer diameter of 150mm, and forms an angle of 30 degrees with the axis of the arch rib; the diameter of the vent hole is 32mm, and the diameter of the slurry outlet hole is 159 mm.
3. The construction method for jacking the arch rib concrete of the steel pipe tied arch bridge according to claim 1, wherein: in the step (1), the concrete is C50 non-shrinkage steel fiber concrete, and the volume content is 0.8%.
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Application publication date: 20200911 |