CN117569213B - Bridge high pier construction method - Google Patents
Bridge high pier construction method Download PDFInfo
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- CN117569213B CN117569213B CN202311667466.2A CN202311667466A CN117569213B CN 117569213 B CN117569213 B CN 117569213B CN 202311667466 A CN202311667466 A CN 202311667466A CN 117569213 B CN117569213 B CN 117569213B
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- 238000010276 construction Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 54
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 44
- 239000010959 steel Substances 0.000 claims abstract description 44
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 28
- 238000005192 partition Methods 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 175
- 238000005507 spraying Methods 0.000 claims description 57
- 230000009194 climbing Effects 0.000 claims description 54
- 230000008569 process Effects 0.000 claims description 38
- 238000001816 cooling Methods 0.000 claims description 36
- 239000007921 spray Substances 0.000 claims description 33
- 238000012544 monitoring process Methods 0.000 claims description 30
- 238000003860 storage Methods 0.000 claims description 21
- 239000010410 layer Substances 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 15
- 229910052751 metal Inorganic materials 0.000 claims description 15
- 239000002023 wood Substances 0.000 claims description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 238000012360 testing method Methods 0.000 claims description 12
- 230000002787 reinforcement Effects 0.000 claims description 11
- 239000004568 cement Substances 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 9
- 238000009415 formwork Methods 0.000 claims description 8
- 230000001680 brushing effect Effects 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 239000002344 surface layer Substances 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 235000014121 butter Nutrition 0.000 claims description 3
- 239000011083 cement mortar Substances 0.000 claims description 3
- 238000012790 confirmation Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims description 3
- 230000003203 everyday effect Effects 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 238000012552 review Methods 0.000 claims description 3
- 238000007788 roughening Methods 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000012876 topography Methods 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/0277—Hardening promoted by using additional water, e.g. by spraying water on the green concrete element
- C04B40/029—Hardening promoted by using additional water, e.g. by spraying water on the green concrete element using an aqueous solution or dispersion
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Ceramic Engineering (AREA)
- Dispersion Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention provides a bridge high pier construction method, which belongs to the technical field of bridge pier construction, and comprises the following steps: step 1: firstly, constructing the top surface of a bearing platform, and then positioning and binding pier column steel bars; step 2: installing a template system; step 3: pouring pier bottom first section concrete; step 4: lengthening, positioning and binding the steel bars, lifting the template, installing an inner mold and pouring concrete; step 5: removing the inner mold until the partition plate is constructed, installing a partition plate bottom mold, binding partition plate reinforcing steel bars, and pouring partition plate concrete; step 6: and (3) until the pier top section, removing the inner die, installing a partition bottom die, binding pier top section steel bars, pouring pier top section concrete and removing a template system. The method is suitable for pier body construction with variable cross section and variable inclination rate, realizes accurate control of the cross section, and simultaneously can control the inclination rate of the pier body more, thereby ensuring construction quality, ensuring good surface quality of the pier body after construction without repairing too much, ensuring quality of high pier and having extremely high controllability.
Description
Technical Field
The invention relates to the technical field of bridge pier construction, in particular to a bridge high pier construction method.
Background
More and more expressways penetrate through various areas of China, but the width of a Chinese operator is large, the topography and the topography of each area are quite different, when the common expressways paved on the ground penetrate through terrains such as valleys, the expressways are required to be provided with high piers to ensure that the expressways do not generate larger drop, in the conventional high pier production process, a large number of scaffolds are arranged in the hollow high piers to fix moulds used for casting concrete, and due to the fact that the height of the bridge piers is higher, the number of scaffolds to be built and removed is huge, a large number of man hours are consumed, so that not only are a lot of consumable materials cost generated, but also slow progress is dragged, and time cost is increased.
In the construction of the high pier, the bridge pier is not always vertically changed according to different heights, so that the section change of the bridge pier at each stage cannot be well controlled by using a conventional construction method, and the accuracy control of slopes and the like is difficult, and therefore, a bridge high pier construction method with higher accuracy and higher efficiency needs to be designed.
Disclosure of Invention
The invention aims to provide a bridge high pier construction method, which solves the technical problems that the conventional high pier construction method cannot accurately control the cross section sizes of different heights and cannot ensure the slope accuracy control.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the construction method of the high pier of the bridge comprises the following steps:
Step 1: firstly, constructing the top surface of a bearing platform, and then positioning and binding pier column steel bars;
Step 2: installing a template system;
Step 3: pouring pier bottom first section concrete;
step 4: lengthening, positioning and binding the steel bars, lifting the template, installing an inner mold and pouring concrete;
Step 5: repeating the step 4 until the partition board is constructed, removing the inner die, installing a partition board bottom die, binding partition board reinforcing steel bars and pouring partition board concrete;
step 6: and 5, repeating the step until the pier top section, removing the inner mold, installing a baffle bottom mold, binding the pier top section steel bars, pouring pier top section concrete and removing the template system.
Further, the specific process of the step 1 is as follows: after the construction of the bearing platform is finished, roughening the bearing platform surface in the pier body range, cleaning, pre-burying a first section of pier body main reinforcements before the concrete pouring of the bearing platform, binding and installing stirrups and constructional reinforcements, and then installing the reinforcements of each section of pier body according to the concrete pouring height;
after the steel bar binding is installed, the measuring group is used for accurately lofting four sides, angles and axes of the pier, the ink-ejecting line is used for marking, and the template is installed with the marking line as a reference.
Further, the specific process of the step 2 is as follows:
(1) Preparing two wood boards 300mm multiplied by 2440mm, placing the wood boards on the horizontal ground according to the middle-to-middle spacing of a climbing cone, ensuring that two axes are absolutely parallel, forming an included angle of 90 degrees with the connecting line of the wood boards, enabling the two diagonal errors to be not more than 2mm, placing a tripod buckle on the axes of the wood boards, ensuring that the middle-to-middle spacing of the tripod is equal to the middle-to-middle spacing of the climbing cone poured for the first time, enabling the diagonal errors of the two tripod to be not more than 2mm, installing platform upright rods, connecting the platform upright rods by using steel pipe fasteners, connecting the two tripod through the same steel pipe fasteners, and adding a diagonal steel pipe;
(2) Installing a platform plate, wherein the platform is required to be flat and firm, holes are formed in positions conflicting with the components to ensure that the frame body is used, and whether the middle-to-middle distance between the two triangular frames is the middle-to-middle position of the first pouring climbing cone is corrected again;
(3) The spliced frame body is integrally lifted and stably hung on a hanging seat body of a pre-buried stress bolt in the first pouring process, and a safety bolt is inserted;
(4) The method comprises the steps of installing a main back edge and all operation platforms, firstly, padding four wood beams under a template, then installing the main back edge, inclined struts and a picking frame on the template, installing back edge fasteners, firmly connecting the picking frame by using steel pipe fasteners, binding inclined struts with the template back edge together by using iron wires to prevent shaking in the lifting process, and ensuring that the platform is required to be flat and firm and perforated at a position conflicting with a part so as to ensure the use of a frame body;
(5) The method comprises the steps of integrally lifting an assembled template and a frame body, stably hanging the assembled template and the frame body on a hanging seat body of a buried stress bolt in the first pouring process, inserting a safety bolt, adjusting an angle by using an inclined strut, correcting the template, closing the mould, pouring concrete, withdrawing the mould after the concrete strength meets the requirement, lifting the template and the frame body, installing a guide rail, a hydraulic system and a lifting platform, and when the guide rail is installed, in order to avoid damage to the hydraulic system, penetrating an upper reversing box from the upper part a certain distance, penetrating a lower reversing box from the lower part upwards, connecting the lower reversing box with an oil cylinder after the lower reversing box is upwards in place, closing the mould, pouring concrete, and enabling the climbing mould to enter a standard climbing state.
Further, the specific process of the step 3 is as follows:
the pier bottom first section pier body template adopts a hydraulic climbing formwork template system, and the first section pier body template adopts a counter-pulling screw rod for reinforcement. After the template is installed, leveling is carried out, after a plane, an elevation, an embedded part and the like are checked, M10 cement mortar is poured into the bottom for sealing, and concrete pouring is started. Before concrete pouring, all parts of the hydraulic climbing formwork embedded part system are embedded and reinforced according to a formwork design drawing.
Further, the specific process of step 4 in step 4 is as follows: after the concrete is poured, removing the mould and moving backwards, installing a wall attaching device, lifting a guide rail, climbing a frame body, binding steel bars, cleaning a template and brushing a release agent, burying a part to fix the template, closing the mould and pouring the concrete;
During climbing, the following steps are carried out: the embedded part is installed, the climbing cone is fixed on the template by using the installation bolt, the high-strength screw rod is screwed after butter is smeared in the climbing cone hole, the concrete cannot flow into the climbing cone screw thread, the embedded part plate is screwed at the other end of the high-strength screw rod, the conical surface faces the template, the climbing cone and the embedded part are in opposite directions, when the embedded part collides with the reinforcing steel bar, the reinforcing steel bar is properly shifted and then is clamped, the reversing devices in the upper reversing box and the lower reversing box are adjusted to be upward at the same time when the guide rail is lifted, the upper end of the reversing device is propped against the guide rail, the reversing devices in the upper reversing box and the lower reversing box are adjusted to be downward at the same time when the frame body is climbed, the lower end is propped against the guide rail, the hydraulic control console is specially operated when the frame body is climbed or the guide rail is lifted, each frame is provided with a special person to see whether the special person is synchronous, the hydraulic valve is found out to be controlled, and the lower layer of wall-attaching hanging seat and the climbing cone are removed after the guide rail is lifted in place, and the guide rail is used in a turnover way.
Further, the die assembly process is as follows:
(1) Cleaning up the template before die assembly, brushing a release agent, and installing a buried part system;
(2) Measuring the position of a template pull rod hole, and judging whether the position conflicts with the steel bar;
(3) Shifting the template to be close to the surface of the concrete;
(4) Correcting and adjusting the perpendicularity of the template by using a line weight or an instrument;
(5) A gear pin is inserted;
(6) Threading a sleeve and a pull rod, and tightening each opposite-pulling screw rod;
(7) The review template is vertical, and each inclined support is fastened;
(8) And (5) pouring concrete.
Further, the concrete process of removing the mould and moving backwards is as follows: (1) the concrete can be disassembled after reaching the strength of 10 MPa;
(2) Discharging all the through-wall bolts and the external angle diagonal rods, and extracting the pull rods, including the diagonal rods;
(3) Pulling out the gear pin;
(4) And (3) moving the template back to place, moving the template by 600-700 mm, and then inserting a back moving bolt.
Further, the specific process of removing the template system in the step 6 is as follows:
(1) Firstly, removing and hanging down the template by using a tower crane;
(2) Removing a template truss system above the main platform, and lifting by using a tower crane;
(3) Extracting the guide rail by using a tower crane;
(4) Dismantling the hydraulic device and the power distribution device;
(5) Dismantling a main platform springboard of the hydraulic control console, and hanging a hydraulic control pump station and a hydraulic device;
(6) An operator is positioned on the hanging platform to detach and hang the lower wall attaching device and the climbing cone;
(7) Lifting the main beam tripod and the lifting platform by using a tower crane to a proper height, detaching the highest layer of wall attachment device and the climbing cone, and repairing the climbing cone hole;
(8) And finally, removing the frame body connected with the ladder or the elevator, unloading the lifting hook, removing the wall attaching device and the climbing cone by an operator, and hanging the last truss frame after the operator descends from the elevator or the ladder.
Further, distributing cooling pipes before pouring concrete in the step 3 and monitoring the temperature after pouring, wherein the cooling pipes are steel pipes with the outer diameter phi of 42 multiplied by 2.5mm, the cooling pipe joints are connected by steel wire reinforced hoses, the joints are firmly and compactly bound, the cooling pipes and the reinforcing steel bars are bound and fixed by 8# iron wires, or the cooling pipes are welded and fixed on bearing platform reinforcing steel bars by adopting a well frame or U-shaped reinforcing steel bars with 16mm ribs, when the positions of the cooling pipes and the reinforcing steel bars conflict, the positions of the reinforcing steel bars are moved, after water cooling and cooling confirmation is finished, grouting and plugging the cooling pipes by cement slurry, and adopting P.O cement with the water-cement ratio of not more than 0.6, and removing the cooling pipes extending out of pier columns;
The positioning and measuring points in the temperature monitoring are arranged as follows: the method comprises the steps that a half axis of a plane symmetry axis of a concrete pouring body is selected in a test area, monitoring points in the test area are arranged in layers according to the plane, the positions and the number of the monitoring points in the test area can be determined according to the distribution condition of a temperature field in the concrete pouring body and the regulation of temperature control, on each test axis, the monitoring points are not less than 4, the monitoring points are arranged according to the plane size of a structure, at least a surface layer, a bottom layer and a central temperature measuring point are arranged along the thickness direction of the concrete pouring body, the distance between the measuring points is not more than 500mm, the temperature measuring point of the concrete surface layer is preferably arranged at a position 50mm away from the concrete surface, the temperature measuring point of the bottom layer is arranged at a position 50 mm-100 mm above the bottom surface of the concrete pouring body, when water cooling is carried out, the positioning is arranged at the middle position of two adjacent cooling water pipes, the temperature measuring points are respectively arranged at the inlet and outlet of the cooling water pipes, a temperature sensor is arranged in a metal protection pipe with the diameter of 20 mm-30 mm, the bottom end of the metal pipe is preferably plugged in advance, the concrete surface is exposed, the metal pipe is preferably fixed, the temperature sensor is preferably arranged, the temperature sensor is arranged, the upper port of the metal pipe is preferably sealed, and the metal pipe is not immersed in the water protection pipe;
The temperature monitoring frequency is: after concrete pouring is completed, measuring and recording the temperature for 1 time every 15-60 minutes, at least not less than 4 times every day and night, measuring the mold entering temperature, not less than 2 times every shift, measuring the temperature of the concrete in the temperature measuring hole every 12 hours after the cooling pipe stops water supply, until the concrete temperature index meets the standard requirement, filling the temperature measuring hole with small stone concrete until the hole is sealed, and stopping temperature monitoring when the difference between the highest temperature of the concrete and the lowest temperature of the environment is continuously 3d less than 25 ℃, and drawing a temperature change curve of each measuring point after the temperature monitoring is finished, so as to compile a temperature monitoring report.
Further, the concrete maintenance is needed for the demolding and the post-shifting, and the concrete process comprises the following steps:
When the height of the pier stud is lower than 30m, wrapping each section of concrete by adopting a film after pouring, dripping water by adopting a water bucket after covering, maintaining uniform holes at the bottom of the bucket, continuously and slowly flowing water for curing, uniformly distributing holes according to a circle at the 1/2 radius of the bottom of the rubber bucket, wherein the hole diameter is 3mm, the number of the holes is 4, and 1 hole is drilled at the center of the bottom of the bucket, so that water seeps and uniformly spreads to the column wall, along the column, all areas in the surface area of the column are uniformly infiltrated by water from top to bottom, the situation of water surplus in the water bucket is timely observed in the curing process, and when the water in the bucket is found to be absent or less, timely adding is carried out;
When the height of the pier stud to be cured is greater than 30m, adopting a high pier concrete spraying curing process, and forming a spraying system through a reservoir, a high-lift water pump, a time relay, a water pipe and a spray pipe, wherein after the water storage capacity of the reservoir can ensure continuous spraying operation conditions, setting the time interval and duration of the time relay and starting a power supply of the spraying system, the spraying system enters a working state, switching on a water pump switch after reaching the formulated spraying time, pumping water from the reservoir to the water pipe by the high-lift water pump, and performing water spraying curing on the concrete surface to be cured by the water pipe, and after the water spraying time reaches a preset time, switching off the water pump switch by the time relay to stop water spraying;
The water storage device adopts water storage tanks, the water storage capacity of each bridge pier is not less than 18m 3, a plurality of water storage tanks are connected in series, the water tanks are constructed as close as possible to the bridge piers, other working procedures which do not affect the bridge pier construction can be guaranteed, the water storage tanks are always guaranteed to have enough water storage capacity, the high-lift water pump is prevented from being burnt out when working in a water shortage state to cause the failure of a spraying system, warning water level lines are marked on the water tanks, and the water level is supplied when the water level is reduced to the warning water level lines;
The lift of the water pump is 5m higher than the highest pier body of the bridge so as to ensure that enough water pressure exists to spray water on the concrete curing surface after the curing water can be pumped to the construction working surface of the highest pier body, and the high-lift water pump has long-time and repeated switching durability so as to ensure the reliability in repeated switching and long-time working and prevent the influence on the spraying effect of the whole spraying system due to unstable performance of the water pump under different use environments;
the water delivery pipe adopts a 5cm steel pipe, the water pump and the spray pipe are connected, the pipe clamp for the water delivery pipe is firmly fixed on a standard section of the tower crane, the water delivery pipe is connected with the spray pipe after being lifted to the pier top, and if the pier height is more than 120m, the water delivery pipe in the range of the lower part of the pier body is required to use an 8cm steel pipe;
The spray pipe is manufactured by adopting a 3cmPVC pipe, 2.5mm small holes are punched and drilled on the spray pipe at intervals of 10cm and used for spraying water, the water holes of the spray pipe are opposite to the concrete surface, so that spray water can not be sprayed on the concrete curing surface under the condition of loss of water pressure, the spray pipe is distributed along a circle of pier body and is fixed below a template, the distance between the spray pipe and the concrete surface is adjusted when the spray pipe is installed on a bottom template, the water column can be scattered on the concrete surface during spraying, and the scattering ranges of the water columns sprayed by two adjacent water holes can be mutually overlapped;
The automatic control system consists of a time relay and an electromagnetic switch, after a timing interval of the time relay is set, the relay controls the electromagnetic switch to be switched on or off to supply power to the high-lift water pump, the time relay and the switch accord with the stability of the high-frequency switch state, and can be adjusted at different environmental temperatures, so that maintenance frequency of a high-temperature period accords with requirements and the high-temperature period stops working in rainy days to save resources, the high-temperature period is set to be 20min for spraying once, the normal-temperature period is 30min for spraying once, each time is 5min for spraying, and the setting of the spraying time should be considered to ensure that the water sprayed last time is not completely evaporated during the second spraying.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
The invention is suitable for pier body construction with variable cross section and variable inclination rate, realizes accurate control of the cross section, and simultaneously can control the inclination rate of the pier body more, thereby ensuring construction quality, ensuring good surface quality of the pier body after construction without repairing too much, ensuring quality of high pier, and having extremely high controllability.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below by referring to the accompanying drawings and by illustrating preferred embodiments. It should be noted, however, that many of the details set forth in the description are merely provided to provide a thorough understanding of one or more aspects of the invention, and that these aspects of the invention may be practiced without these specific details.
As shown in fig. 1, taking the maximum pier height of 155.0m as a left-width 24# pier of a main bridge of a long super bridge as an example, a variable-section hollow pier is taken as an example, and the bridge high pier construction method comprises the following steps:
Step 1: firstly, constructing the top surface of a bearing platform, and then positioning and binding pier column steel bars;
Step 2: installing a template system;
Step 3: pouring pier bottom first section concrete;
step 4: lengthening, positioning and binding the steel bars, lifting the template, installing an inner mold and pouring concrete;
Step 5: repeating the step 4 until the partition board is constructed, removing the inner die, installing a partition board bottom die, binding partition board reinforcing steel bars and pouring partition board concrete;
step 6: and 5, repeating the step until the pier top section, removing the inner mold, installing a baffle bottom mold, binding the pier top section steel bars, pouring pier top section concrete and removing the template system.
In the embodiment of the present invention, the specific process in step 1 is as follows: after the construction of the bearing platform is finished, roughening the bearing platform surface in the pier body range, cleaning, pre-burying a first section of pier body main reinforcements before the concrete pouring of the bearing platform, binding and installing stirrups and constructional reinforcements, and then installing the reinforcements of each section of pier body according to the concrete pouring height;
after the steel bar binding is installed, the measuring group is used for accurately lofting four sides, angles and axes of the pier, the ink-ejecting line is used for marking, and the template is installed with the marking line as a reference.
In the embodiment of the invention, the specific process of the step 2 is as follows:
(1) Preparing two wood boards 300mm multiplied by 2440mm, placing the wood boards on the horizontal ground according to the middle-to-middle spacing of a climbing cone, ensuring that two axes are absolutely parallel, forming an included angle of 90 degrees with the connecting line of the wood boards, enabling the two diagonal errors to be not more than 2mm, placing a tripod buckle on the axes of the wood boards, ensuring that the middle-to-middle spacing of the tripod is equal to the middle-to-middle spacing of the climbing cone poured for the first time, enabling the diagonal errors of the two tripod to be not more than 2mm, installing platform upright rods, connecting the platform upright rods by using steel pipe fasteners, connecting the two tripod through the same steel pipe fasteners, and adding a diagonal steel pipe;
(2) Installing a platform plate, wherein the platform is required to be flat and firm, holes are formed in positions conflicting with the components to ensure that the frame body is used, and whether the middle-to-middle distance between the two triangular frames is the middle-to-middle position of the first pouring climbing cone is corrected again;
(3) The spliced frame body is integrally lifted and stably hung on a hanging seat body of a pre-buried stress bolt in the first pouring process, and a safety bolt is inserted;
(4) The method comprises the steps of installing a main back edge and all operation platforms, firstly, padding four wood beams under a template, then installing the main back edge, inclined struts and a picking frame on the template, installing back edge fasteners, firmly connecting the picking frame by using steel pipe fasteners, binding inclined struts with the template back edge together by using iron wires to prevent shaking in the lifting process, and ensuring that the platform is required to be flat and firm and perforated at a position conflicting with a part so as to ensure the use of a frame body;
(5) The method comprises the steps of integrally lifting an assembled template and a frame body, stably hanging the assembled template and the frame body on a hanging seat body of a buried stress bolt in the first pouring process, inserting a safety bolt, adjusting an angle by using an inclined strut, correcting the template, closing the mould, pouring concrete, withdrawing the mould after the concrete strength meets the requirement, lifting the template and the frame body, installing a guide rail, a hydraulic system and a lifting platform, and when the guide rail is installed, in order to avoid damage to the hydraulic system, penetrating an upper reversing box from the upper part a certain distance, penetrating a lower reversing box from the lower part upwards, connecting the lower reversing box with an oil cylinder after the lower reversing box is upwards in place, closing the mould, pouring concrete, and enabling the climbing mould to enter a standard climbing state.
In the embodiment of the invention, the specific process of the step 3 is as follows:
the pier bottom first section pier body template adopts a hydraulic climbing formwork template system, and the first section pier body template adopts a counter-pulling screw rod for reinforcement. After the template is installed, leveling is carried out, after a plane, an elevation, an embedded part and the like are checked, M10 cement mortar is poured into the bottom for sealing, and concrete pouring is started. Before concrete pouring, all parts of the hydraulic climbing formwork embedded part system are embedded and reinforced according to a formwork design drawing.
In the embodiment of the invention, the specific process of step4 in step4 is as follows: after the concrete is poured, removing the mould and moving backwards, installing a wall attaching device, lifting a guide rail, climbing a frame body, binding steel bars, cleaning a template and brushing a release agent, burying a part to fix the template, closing the mould and pouring the concrete;
During climbing, the following steps are carried out: the embedded part is installed, the climbing cone is fixed on the template by using the installation bolt, the high-strength screw rod is screwed after butter is smeared in the climbing cone hole, the concrete cannot flow into the climbing cone screw thread, the embedded part plate is screwed at the other end of the high-strength screw rod, the conical surface faces the template, the climbing cone and the embedded part are in opposite directions, when the embedded part collides with the reinforcing steel bar, the reinforcing steel bar is properly shifted and then is clamped, the reversing devices in the upper reversing box and the lower reversing box are adjusted to be upward at the same time when the guide rail is lifted, the upper end of the reversing device is propped against the guide rail, the reversing devices in the upper reversing box and the lower reversing box are adjusted to be downward at the same time when the frame body is climbed, the lower end is propped against the guide rail, the hydraulic control console is specially operated when the frame body is climbed or the guide rail is lifted, each frame is provided with a special person to see whether the special person is synchronous, the hydraulic valve is found out to be controlled, and the lower layer of wall-attaching hanging seat and the climbing cone are removed after the guide rail is lifted in place, and the guide rail is used in a turnover way.
In the embodiment of the invention, the die assembly process is as follows:
(1) Cleaning up the template before die assembly, brushing a release agent, and installing a buried part system;
(2) Measuring the position of a template pull rod hole, and judging whether the position conflicts with the steel bar;
(3) Shifting the template to be close to the surface of the concrete;
(4) Correcting and adjusting the perpendicularity of the template by using a line weight or an instrument;
(5) A gear pin is inserted;
(6) Threading a sleeve and a pull rod, and tightening each opposite-pulling screw rod;
(7) The review template is vertical, and each inclined support is fastened;
(8) And (5) pouring concrete.
In the embodiment of the invention, the concrete process of removing the mould and moving backwards is as follows: (1) the concrete can be disassembled after reaching the strength of 10 MPa;
(2) Discharging all the through-wall bolts and the external angle diagonal rods, and extracting the pull rods, including the diagonal rods;
(3) Pulling out the gear pin;
(4) And (3) moving the template back to place, moving the template by 600-700 mm, and then inserting a back moving bolt.
In the embodiment of the invention, the specific process of removing the template system in the step 6 is as follows:
(1) Firstly, removing and hanging down the template by using a tower crane;
(2) Removing a template truss system above the main platform, and lifting by using a tower crane;
(3) Extracting the guide rail by using a tower crane;
(4) Dismantling the hydraulic device and the power distribution device;
(5) Dismantling a main platform springboard of the hydraulic control console, and hanging a hydraulic control pump station and a hydraulic device;
(6) An operator is positioned on the hanging platform to detach and hang the lower wall attaching device and the climbing cone;
(7) Lifting the main beam tripod and the lifting platform by using a tower crane to a proper height, detaching the highest layer of wall attachment device and the climbing cone, and repairing the climbing cone hole;
(8) And finally, removing the frame body connected with the ladder or the elevator, unloading the lifting hook, removing the wall attaching device and the climbing cone by an operator, and hanging the last truss frame after the operator descends from the elevator or the ladder.
In the embodiment of the invention, cooling pipes are uniformly distributed before the concrete is poured in the step 3 and the temperature monitoring is carried out after the concrete is poured, the cooling pipes are steel pipes with the outer diameter phi of 42 multiplied by 2.5mm, the joint of the cooling pipe joints is connected by adopting steel wire reinforced hoses, the joint is firmly and compactly bound, the cooling pipes and the reinforcing steel bars are bound and fixed by adopting 8# iron wires, or the cooling pipes and the reinforcing steel bars are made into a cross frame or U-shaped reinforcing steel bars by adopting 16mm ribbed reinforcing steel bars, the positions of the reinforcing steel bars are moved when the cooling pipes collide with the reinforcing steel bars, after the water cooling and temperature reduction confirmation are finished, grouting and plugging are carried out on the cooling pipes by cement slurry, the cooling pipes are filled with P.O 42.5.5 cement, the water-cement ratio is not more than 0.6, and the cooling pipes extending out of pier columns are cut off;
The positioning and measuring points in the temperature monitoring are arranged as follows: the method comprises the steps that a half axis of a plane symmetry axis of a concrete pouring body is selected in a test area, monitoring points in the test area are arranged in layers according to the plane, the positions and the number of the monitoring points in the test area can be determined according to the distribution condition of a temperature field in the concrete pouring body and the regulation of temperature control, on each test axis, the monitoring points are not less than 4, the monitoring points are arranged according to the plane size of a structure, at least a surface layer, a bottom layer and a central temperature measuring point are arranged along the thickness direction of the concrete pouring body, the distance between the measuring points is not more than 500mm, the temperature measuring point of the concrete surface layer is preferably arranged at a position 50mm away from the concrete surface, the temperature measuring point of the bottom layer is arranged at a position 50 mm-100 mm above the bottom surface of the concrete pouring body, when water cooling is carried out, the positioning is arranged at the middle position of two adjacent cooling water pipes, the temperature measuring points are respectively arranged at the inlet and outlet of the cooling water pipes, a temperature sensor is arranged in a metal protection pipe with the diameter of 20 mm-30 mm, the bottom end of the metal pipe is preferably plugged in advance, the concrete surface is exposed, the metal pipe is preferably fixed, the temperature sensor is preferably arranged, the temperature sensor is arranged, the upper port of the metal pipe is preferably sealed, and the metal pipe is not immersed in the water protection pipe;
The temperature monitoring frequency is: after concrete pouring is completed, measuring and recording the temperature for 1 time every 15-60 minutes, at least not less than 4 times every day and night, measuring the mold entering temperature, not less than 2 times every shift, measuring the temperature of the concrete in the temperature measuring hole every 12 hours after the cooling pipe stops water supply, until the concrete temperature index meets the standard requirement, filling the temperature measuring hole with small stone concrete until the hole is sealed, and stopping temperature monitoring when the difference between the highest temperature of the concrete and the lowest temperature of the environment is continuously 3d less than 25 ℃, and drawing a temperature change curve of each measuring point after the temperature monitoring is finished, so as to compile a temperature monitoring report.
In the embodiment of the invention, concrete maintenance is needed for the removal and the backward movement of the mould, and the concrete process comprises the following steps:
When the height of the pier stud is lower than 30m, wrapping each section of concrete by adopting a film after pouring, dripping water by adopting a water bucket after covering, maintaining uniform holes at the bottom of the bucket, continuously and slowly flowing water for curing, uniformly distributing holes according to a circle at the 1/2 radius of the bottom of the rubber bucket, wherein the hole diameter is 3mm, the number of the holes is 4, and 1 hole is drilled at the center of the bottom of the bucket, so that water seeps and uniformly spreads to the column wall, along the column, all areas in the surface area of the column are uniformly infiltrated by water from top to bottom, the situation of water surplus in the water bucket is timely observed in the curing process, and when the water in the bucket is found to be absent or less, timely adding is carried out;
When the height of the pier stud to be cured is greater than 30m, adopting a high pier concrete spraying curing process, and forming a spraying system through a reservoir, a high-lift water pump, a time relay, a water pipe and a spray pipe, wherein after the water storage capacity of the reservoir can ensure continuous spraying operation conditions, setting the time interval and duration of the time relay and starting a power supply of the spraying system, the spraying system enters a working state, switching on a water pump switch after reaching the formulated spraying time, pumping water from the reservoir to the water pipe by the high-lift water pump, and performing water spraying curing on the concrete surface to be cured by the water pipe, and after the water spraying time reaches a preset time, switching off the water pump switch by the time relay to stop water spraying;
The water storage device adopts water storage tanks, the water storage capacity of each bridge pier is not less than 18m 3, a plurality of water storage tanks are connected in series, the water tanks are constructed as close as possible to the bridge piers, other working procedures which do not affect the bridge pier construction can be guaranteed, the water storage tanks are always guaranteed to have enough water storage capacity, the high-lift water pump is prevented from being burnt out when working in a water shortage state to cause the failure of a spraying system, warning water level lines are marked on the water tanks, and the water level is supplied when the water level is reduced to the warning water level lines;
The lift of the water pump is 5m higher than the highest pier body of the bridge so as to ensure that enough water pressure exists to spray water on the concrete curing surface after the curing water can be pumped to the construction working surface of the highest pier body, and the high-lift water pump has long-time and repeated switching durability so as to ensure the reliability in repeated switching and long-time working and prevent the influence on the spraying effect of the whole spraying system due to unstable performance of the water pump under different use environments;
the water delivery pipe adopts a 5cm steel pipe, the water pump and the spray pipe are connected, the pipe clamp for the water delivery pipe is firmly fixed on a standard section of the tower crane, the water delivery pipe is connected with the spray pipe after being lifted to the pier top, and if the pier height is more than 120m, the water delivery pipe in the range of the lower part of the pier body is required to use an 8cm steel pipe;
The spray pipe is manufactured by adopting a 3cmPVC pipe, 2.5mm small holes are punched and drilled on the spray pipe at intervals of 10cm and used for spraying water, the water holes of the spray pipe are opposite to the concrete surface, so that spray water can not be sprayed on the concrete curing surface under the condition of loss of water pressure, the spray pipe is distributed along a circle of pier body and is fixed below a template, the distance between the spray pipe and the concrete surface is adjusted when the spray pipe is installed on a bottom template, the water column can be scattered on the concrete surface during spraying, and the scattering ranges of the water columns sprayed by two adjacent water holes can be mutually overlapped;
The automatic control system consists of a time relay and an electromagnetic switch, after a timing interval of the time relay is set, the relay controls the electromagnetic switch to be switched on or off to supply power to the high-lift water pump, the time relay and the switch accord with the stability of the high-frequency switch state, and can be adjusted at different environmental temperatures, so that maintenance frequency of a high-temperature period accords with requirements and the high-temperature period stops working in rainy days to save resources, the high-temperature period is set to be 20min for spraying once, the normal-temperature period is 30min for spraying once, each time is 5min for spraying, and the setting of the spraying time should be considered to ensure that the water sprayed last time is not completely evaporated during the second spraying.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (1)
1. The bridge high pier construction method is characterized by comprising the following steps of: the method comprises the following steps:
Step 1: firstly, constructing the top surface of a bearing platform, and then positioning and binding pier column steel bars;
Step 2: installing a template system;
Step 3: pouring pier bottom first section concrete;
step 4: lengthening, positioning and binding the steel bars, lifting the template, installing an inner mold and pouring concrete;
Step 5: repeating the step 4 until the partition board is constructed, removing the inner die, installing a partition board bottom die, binding partition board reinforcing steel bars and pouring partition board concrete;
step 6: repeating the step 5 until the pier top section, removing the inner mold, installing a partition bottom mold, binding the pier top section steel bars, pouring pier top section concrete and removing a template system;
the specific process of the step 1 is as follows: after the construction of the bearing platform is finished, roughening the bearing platform surface in the pier body range, cleaning, pre-burying a first section of pier body main reinforcements before the concrete pouring of the bearing platform, binding and installing stirrups and constructional reinforcements, and then installing the reinforcements of each section of pier body according to the concrete pouring height;
After the binding and installation of the reinforcing steel bars are completed, the measuring group is used for accurately lofting four sides, angles and axes of pier positions, the ink-ejecting lines are marked, and the template is installed with the marked lines as references;
the specific process of the step2 is as follows:
(1) Preparing two wood boards 300mm multiplied by 2440mm, placing the wood boards on the horizontal ground according to the middle-to-middle spacing of a climbing cone, ensuring that two axes are absolutely parallel, forming an included angle of 90 degrees with the connecting line of the wood boards, enabling the two diagonal errors to be not more than 2mm, placing a tripod buckle on the axes of the wood boards, ensuring that the middle-to-middle spacing of the tripod is equal to the middle-to-middle spacing of the climbing cone poured for the first time, enabling the diagonal errors of the two tripod to be not more than 2mm, installing platform upright rods, connecting the platform upright rods by using steel pipe fasteners, connecting the two tripod through the same steel pipe fasteners, and adding a diagonal steel pipe;
(2) Installing a platform plate, wherein the platform is required to be flat and firm, holes are formed in positions conflicting with the components to ensure that the frame body is used, and whether the middle-to-middle distance between the two triangular frames is the middle-to-middle position of the first pouring climbing cone is corrected again;
(3) The spliced frame body is integrally lifted and stably hung on a hanging seat body of a pre-buried stress bolt in the first pouring process, and a safety bolt is inserted;
(4) The method comprises the steps of installing a main back edge and all operation platforms, firstly, padding four wood beams under a template, then installing the main back edge, inclined struts and a picking frame on the template, installing back edge fasteners, firmly connecting the picking frame by using steel pipe fasteners, binding inclined struts with the template back edge together by using iron wires to prevent shaking in the lifting process, and ensuring that the platform is required to be flat and firm and perforated at a position conflicting with a part so as to ensure the use of a frame body;
(5) The method comprises the steps of integrally lifting an assembled template and a frame body, stably hanging the assembled template and the frame body on a hanging seat body of a buried stress bolt in the first pouring, inserting a safety bolt, adjusting an angle by using an inclined strut, correcting the template, closing the mould, and carrying out concrete pouring, withdrawing the mould after the concrete strength meets the requirement, lifting the template and the frame body, installing a guide rail, a hydraulic system and a lifting platform, and when the guide rail is installed, penetrating the guide rail from the upper part into an upper reversing box for a certain distance, penetrating the guide rail into a lower reversing box from the lower part upwards, connecting the lower reversing box with an oil cylinder after the lower reversing box is upwards in place, closing the mould, carrying out concrete pouring, and enabling the climbing mould to enter a standard climbing state;
The specific process of the step3 is as follows:
the method comprises the steps that a pier bottom first section pier body template adopts a template system of a hydraulic climbing formwork, the first section pier body template adopts a counter-pulling screw rod to reinforce, leveling is carried out after the template is installed, after a plane, an elevation and an embedded part are checked to be correct, M10 cement mortar is poured into the bottom to seal, concrete pouring is started, and all parts of the hydraulic climbing formwork embedded part system are pre-buried and reinforced according to a template design drawing before concrete pouring;
The specific process of the step 4 in the step 4 is as follows: after the concrete is poured, removing the mould and moving backwards, installing a wall attaching device, lifting a guide rail, climbing a frame body, binding steel bars, cleaning a template and brushing a release agent, burying a part to fix the template, closing the mould and pouring the concrete;
During climbing, the following steps are carried out: the embedded part is installed, the climbing cone is fixed on the template by using an installation bolt, butter is smeared in a climbing cone hole, then a high-strength screw rod is screwed, concrete cannot flow into the climbing cone screw thread, the embedded part plate is screwed at the other end of the high-strength screw rod, the conical surface faces the template, the climbing cone and the embedded part are in opposite directions, when the embedded part collides with the reinforcing steel bar, the reinforcing steel bar is properly shifted and then is clamped, the reversing devices in the upper reversing box and the lower reversing box are adjusted to be upward at the same time when the guide rail is lifted, the upper end of the reversing device is propped against the guide rail, the reversing devices in the upper reversing box and the lower reversing box are adjusted to be downward at the same time when the frame body is climbed, the lower end is propped against the guide rail, a hydraulic control console is specially operated when the frame body is climbed or the guide rail is lifted, each frame is provided with a special person to see whether the special person is synchronous, the hydraulic valve is found out to be controlled, and the lower layer of wall hanging seat and the climbing cone are removed after the guide rail is lifted in place, and the guide rail is used in turn;
The die assembly process comprises the following steps:
(1) Cleaning up the template before die assembly, brushing a release agent, and installing a buried part system;
(2) Measuring the position of a template pull rod hole, and judging whether the position conflicts with the steel bar;
(3) Shifting the template to be close to the surface of the concrete;
(4) Correcting and adjusting the perpendicularity of the template by using a line weight or an instrument;
(5) A gear pin is inserted;
(6) Threading a sleeve and a pull rod, and tightening each opposite-pulling screw rod;
(7) The review template is vertical, and each inclined support is fastened;
(8) Pouring concrete;
the concrete process of removing the mould and moving backwards is as follows: (1) the concrete can be disassembled after reaching the strength of 10 MPa;
(2) Discharging all the through-wall bolts and the external angle diagonal rods, and extracting the pull rods, including the diagonal rods;
(3) Pulling out the gear pin;
(4) Moving the template back to the proper position, moving the template by 600-700 mm, and then inserting a back moving bolt;
The concrete process of removing the template system in the step 6 is as follows:
(1) Firstly, removing and hanging down the template by using a tower crane;
(2) Removing a template truss system above the main platform, and lifting by using a tower crane;
(3) Extracting the guide rail by using a tower crane;
(4) Dismantling the hydraulic device and the power distribution device;
(5) Dismantling a main platform springboard of the hydraulic control console, and hanging a hydraulic control pump station and a hydraulic device;
(6) An operator is positioned on the hanging platform to detach and hang the lower wall attaching device and the climbing cone;
(7) Lifting the main beam tripod and the lifting platform by using a tower crane to a proper height, detaching the highest layer of wall attachment device and the climbing cone, and repairing the climbing cone hole;
(8) Finally, removing the frame body connected with the ladder or the elevator, removing the lifting hook, the wall attaching device and the climbing cone by an operator, and then hanging the last truss frame after the operator descends from the elevator or the ladder;
the cooling pipes are uniformly distributed before the concrete pouring in the step 3 and the temperature monitoring is carried out after the concrete pouring, the cooling pipes are steel pipes with the outer diameter phi of 42 multiplied by 2.5mm, the cooling pipe joints are connected by steel wire reinforced hoses, the joints are firmly and compactly bound, the cooling pipes and the reinforcing steel bars are bound and fixed by 8# iron wires, or the cooling pipes are welded and fixed on bearing platform reinforcing steel bars by adopting 16mm ribbed reinforcing steel bars to manufacture a cross frame or U-shaped reinforcing steel bars, when the positions of the cooling pipes and the reinforcing steel bars conflict, the positions of the reinforcing steel bars are moved, grouting and plugging are carried out on the cooling pipes by cement slurry after the water cooling confirmation is finished, the cooling pipes are filled with P.O 42.5.5 cement with the water cement ratio of not more than 0.6, and the cooling pipes extending out of pier columns are removed;
The positioning and measuring points in the temperature monitoring are arranged as follows: the method comprises the steps that a half axis of a plane symmetry axis of a concrete pouring body is selected in a test area, monitoring points in the test area are arranged in layers according to the plane, the positions and the number of the monitoring points in the test area can be determined according to the distribution condition of a temperature field in the concrete pouring body and the regulation of temperature control, on each test axis, the monitoring points are not less than 4, the monitoring points are arranged according to the plane size of a structure, at least a surface layer, a bottom layer and a central temperature measuring point are arranged along the thickness direction of the concrete pouring body, the distance between the measuring points is not more than 500mm, the temperature measuring point of the concrete surface layer is preferably arranged at a position 50mm away from the concrete surface, the temperature measuring point of the bottom layer is arranged at a position 50 mm-100 mm above the bottom surface of the concrete pouring body, when water cooling is carried out, the positioning is arranged at the middle position of two adjacent cooling water pipes, the temperature measuring points are respectively arranged at the inlet and outlet of the cooling water pipes, a temperature sensor is arranged in a metal protection pipe with the diameter of 20 mm-30 mm, the bottom end of the metal pipe is preferably plugged in advance, the concrete surface is exposed, the metal pipe is preferably fixed, the temperature sensor is preferably arranged, the temperature sensor is arranged, the upper port of the metal pipe is preferably sealed, and the metal pipe is not immersed in the water protection pipe;
The temperature monitoring frequency is: measuring and recording the temperature for 1 time every 15-60 minutes after concrete pouring is finished, at least 4 times every day and night, measuring the mold entering temperature, at least 2 times every shift, measuring the temperature of the concrete in a temperature measuring hole every 12 hours after a cooling pipe stops water supply, filling the temperature measuring hole with small stone concrete until the concrete temperature index meets the standard requirement, and stopping temperature monitoring when the difference between the highest temperature of the concrete and the lowest temperature of the environment is continuously 3d less than 25 ℃, and drawing a temperature change curve of each measuring point after the temperature monitoring is finished to compile a temperature monitoring report;
the concrete maintenance is needed for the post-removal of the form, and the concrete process is as follows:
When the height of the pier stud is lower than 30m, wrapping each section of concrete by adopting a film after pouring, dripping water by adopting a water bucket after covering, maintaining uniform holes at the bottom of the bucket, continuously and slowly flowing water for curing, uniformly distributing holes according to a circle at the 1/2 radius of the bottom of the rubber bucket, wherein the hole diameter is 3mm, the number of the holes is 4, and 1 hole is drilled at the center of the bottom of the bucket, so that water seeps and uniformly spreads to the column wall, along the column, all areas in the surface area of the column are uniformly infiltrated by water from top to bottom, the situation of water surplus in the water bucket is timely observed in the curing process, and when the water in the bucket is found to be absent or less, timely adding is carried out;
When the height of the pier stud to be cured is greater than 30m, adopting a high pier concrete spraying curing process, and forming a spraying system through a reservoir, a high-lift water pump, a time relay, a water pipe and a spray pipe, wherein after the water storage capacity of the reservoir can ensure continuous spraying operation conditions, setting the time interval and duration of the time relay and starting a power supply of the spraying system, the spraying system enters a working state, switching on a water pump switch after reaching the formulated spraying time, pumping water from the reservoir to the water pipe by the high-lift water pump, and performing water spraying curing on the concrete surface to be cured by the water pipe, and after the water spraying time reaches a preset time, switching off the water pump switch by the time relay to stop water spraying;
The water storage device adopts water storage tanks, the water storage capacity of each bridge pier is not less than 18m 3, a plurality of water storage tanks are connected in series, the water tanks are constructed as close as possible to the bridge piers, other working procedures which do not affect the bridge pier construction can be guaranteed, the water storage tanks are always guaranteed to have enough water storage capacity, the high-lift water pump is prevented from being burnt out when working in a water shortage state to cause the failure of a spraying system, warning water level lines are marked on the water tanks, and the water level is supplied when the water level is reduced to the warning water level lines;
The lift of the water pump is 5m higher than the highest pier body of the bridge so as to ensure that enough water pressure exists to spray water on the concrete curing surface after the curing water can be pumped to the construction working surface of the highest pier body, and the high-lift water pump has long-time and repeated switching durability so as to ensure the reliability in repeated switching and long-time working and prevent the influence on the spraying effect of the whole spraying system due to unstable performance of the water pump under different use environments;
the water delivery pipe adopts a 5cm steel pipe, the water pump and the spray pipe are connected, the pipe clamp for the water delivery pipe is firmly fixed on a standard section of the tower crane, the water delivery pipe is connected with the spray pipe after being lifted to the pier top, and if the pier height is more than 120m, the water delivery pipe in the range of the lower part of the pier body is required to use an 8cm steel pipe;
The spray pipe is manufactured by adopting a 3cmPVC pipe, 2.5mm small holes are punched and drilled on the spray pipe at intervals of 10cm and used for spraying water, the water holes of the spray pipe are opposite to the concrete surface, so that spray water can not be sprayed on the concrete curing surface under the condition of loss of water pressure, the spray pipe is distributed along a circle of pier body and is fixed below a template, the distance between the spray pipe and the concrete surface is adjusted when the spray pipe is installed on a bottom template, the water column can be scattered on the concrete surface during spraying, and the scattering ranges of the water columns sprayed by two adjacent water holes can be mutually overlapped;
The automatic control system consists of a time relay and an electromagnetic switch, after a timing interval of the time relay is set, the relay controls the electromagnetic switch to be switched on or off to supply power to the high-lift water pump, the time relay and the switch accord with the stability of the high-frequency switch state, and can be adjusted at different environmental temperatures, so that maintenance frequency of a high-temperature period accords with requirements and the high-temperature period stops working in rainy days to save resources, the high-temperature period is set to be 20min for spraying once, the normal-temperature period is 30min for spraying once, each time is 5min for spraying, and the setting of the spraying time should be considered to ensure that the water sprayed last time is not completely evaporated during the second spraying.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101429752A (en) * | 2007-11-05 | 2009-05-13 | 中交一航局第一工程有限公司 | Pier column prefabrication splicing building technology |
| CN111576234A (en) * | 2020-05-29 | 2020-08-25 | 中铁一局集团有限公司 | Safe and rapid construction method for turnover-type high pier |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9016025B2 (en) * | 2012-06-11 | 2015-04-28 | Zhejiang Construction Engineering Group Co., Ltd | Constructing method for concrete cylinder of construction steel bar of high-rise steel structure |
| CN108677722A (en) * | 2018-05-23 | 2018-10-19 | 五冶集团上海有限公司 | Hollow High Pier with Thin Wall stub top section construction technology |
| CN109958062A (en) * | 2019-04-12 | 2019-07-02 | 北京市政建设集团有限责任公司 | A kind of pier stud construction technology |
| CN110184938A (en) * | 2019-06-11 | 2019-08-30 | 中铁七局集团有限公司 | High pier is without bracket climbing formwork for construction method |
| CN110512524A (en) * | 2019-08-16 | 2019-11-29 | 中交一公局第五工程有限公司 | A kind of bridge pier column safe construction method |
| CN113062222B (en) * | 2021-03-17 | 2022-10-21 | 中交一公局集团有限公司 | Improved construction device and method for roller die of high pier of bridge |
| CN118547573A (en) * | 2022-09-19 | 2024-08-27 | 中交一公局第七工程有限公司 | Template system for integrally pouring bridge pier and tie beam |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101429752A (en) * | 2007-11-05 | 2009-05-13 | 中交一航局第一工程有限公司 | Pier column prefabrication splicing building technology |
| CN111576234A (en) * | 2020-05-29 | 2020-08-25 | 中铁一局集团有限公司 | Safe and rapid construction method for turnover-type high pier |
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