CN113186824A - Rollover construction method for round-end-shaped solid pier - Google Patents
Rollover construction method for round-end-shaped solid pier Download PDFInfo
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- CN113186824A CN113186824A CN202110394228.3A CN202110394228A CN113186824A CN 113186824 A CN113186824 A CN 113186824A CN 202110394228 A CN202110394228 A CN 202110394228A CN 113186824 A CN113186824 A CN 113186824A
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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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Abstract
The invention belongs to the field of bridge construction, and particularly relates to construction of a pier, in particular to a rollover construction method of a round-end-shaped solid pier. When the pier body template is processed, the arc templates at two ends are completely processed according to the maximum pier body height, and only one part of the straight line part is processed. The pier body is poured step by step during construction. The pier shaft formwork supporting arc-shaped formworks are installed from bottom to top in a layered mode, and the straight line portion formwork is lifted to the upper layer from the lower layer and is continuously turned over until the pier top. And after the pouring is finished, the template is dismantled from bottom to top, the arc-shaped template is used for turnover of other piers after being dismantled, the topmost template is not dismantled on the straight line part, and other templates are turned to the upper layer. The invention effectively improves the construction efficiency, ensures the construction safety and the engineering quality, passes the engineering acceptance and has obvious social benefit and economic benefit.
Description
Technical Field
The invention belongs to the field of bridge construction, and particularly relates to construction of a pier, in particular to a rollover construction method of a round-end-shaped solid pier.
Background
With the rapid development of bridge construction, the round-end-shaped solid pier is widely applied, and usually, a pier with a slope is a round-end-shaped solid pier for 10-30 meters. The construction of round end shape entity pier generally adopts a whole set of design steel form, once formwork erection pours in grades, has the template expense higher, the lower problem of template turnover rate.
Disclosure of Invention
The invention provides a rollover construction method for a round-end-shaped solid pier, aiming at the problems of higher template cost and lower template turnover rate of a construction method for pouring the round-end-shaped solid pier by adopting one-step formwork support in a grading manner.
The invention is realized by adopting the following technical scheme: the rollover construction method of the round end-shaped solid pier comprises the following steps:
(1) when the pier body template is processed, according to the height of the pier body, all the arc templates at two ends of the pier body are processed, and only one part of the pier body linear template is processed;
(2) construction preparation, namely measuring and lofting according to the center of a foundation top to form a vertical mold side line;
(3) binding the 1 st section of steel bar;
(4) installing an arc template and a linear template at two ends of the 1 st section;
(5) pouring concrete of section 1;
(6) binding the 2 nd section of steel bar after the 1 st section of concrete reaches the form removal strength,
(7) installing arc templates at two ends of a section 2, removing the section 1 straight line template and reserving a top layer template of the section 1 straight line template, taking the top layer template of the section 1 straight line template as a supporting platform of the section 2 straight line template, and installing the removed straight line template on the basis of the supporting platform as the section 2 straight line template;
(8) pouring the section 2 concrete;
(9) binding the 3 rd section of steel bar after the 2 nd section of concrete reaches the form removal strength,
(10) installing a 3 rd section of arc-shaped template at two ends, dismantling a 2 nd section of linear template and a supporting platform thereof, and reserving a top layer template of the 2 nd section of linear template, wherein the top layer template of the 2 nd section of linear template is used as the supporting platform of the 3 rd section of linear template, and the dismantled 2 nd section of linear template is installed on the basis of the supporting platform and is used as the 3 rd section of linear template;
(11) pouring the 3 rd section concrete;
(12) after the 3 rd section of concrete reaches the form removal strength, pouring the rest sections of concrete according to the same method until the pier body is capped;
(13) and (5) the pier construction is finished when the pier top is constructed.
When the pier body template is machined, according to the maximum pier body height, the arc templates at two ends are all machined, and only one part of the straight line part is machined. The pier body is poured step by step during construction. The pier shaft formwork supporting arc-shaped formworks are installed from bottom to top in a layered mode, and the straight line portion formwork is lifted to the upper layer from the lower layer and is continuously turned over until the pier top. And after the pouring is finished, the formwork is dismantled from bottom to top, the arc-shaped formwork is used for turnover of other piers after being dismantled, the topmost formwork is not dismantled on the straight line part, and other formworks are turned to the upper layer.
According to the turnover formwork construction method for the round-end-shaped solid pier, the next section of linear formwork can be detached while one section of steel bar is bound.
According to the rollover construction method for the round-end-shaped solid pier, safety facilities in construction comprise an upper platform fence, a transverse safety net and a fence dense mesh net, when a pier body is constructed, a support is erected between pier positions, a zigzag ladder stand is arranged on the support, the width of the ladder stand is 1.2m, the elevation angle of the ladder stand is 45 degrees, a rest platform is arranged at the height of 6m per liter, the platform width is 1m, so that a worker can rest, and the construction and inspection personnel can be guaranteed to be safe and convenient to use up and down.
According to the turnover construction method for the round-end-shaped solid pier, after the templates are assembled and formed, all bolts do not need to be screwed, a small amount of loosening room is reserved, the front and back direction deflection of the templates is adjusted to be pulled to the correct position through the chain block, the left and right deflection adjustment is realized by plugging the gasket at one end of the bottom edge of the template close to the inclination direction, the gap between the templates is plugged with the rubber strip to prevent slurry leakage, and after the adjustment is finished, all the bolts are screwed, so that concrete can be poured.
According to the turnover construction method for the round-end-shaped solid pier, when concrete is poured to the top of the formwork, the height of the concrete is 1-2 cm lower than the opening of the formwork, so that the next section of the formwork is convenient to assemble and turnover, and the slab staggering is avoided.
In the turnover construction method of the round-end-shaped solid pier, the turnover lifting of the straight template is realized by using a truck crane.
In the pier body rollover treatment construction, the pier body formwork supporting arc-shaped formworks are installed from bottom to top in a layered mode, the straight line portion formworks are lifted from the lower layer to the upper layer and are continuously turned over until the pier tops, the construction process is innovated, the construction progress is accelerated, the construction cost is saved, the construction efficiency is effectively improved, the construction safety and the construction quality are ensured, and the pier body rollover treatment construction method has obvious social benefits and economic benefits after passing through engineering acceptance.
Drawings
FIG. 1 is a construction flow chart of the present invention.
Detailed Description
The 10-30 m round end-shaped solid pier is constructed by adopting a turnover formwork, and the turnover formwork is used for a construction system, a lifting mechanism, a formwork system and safety facilities.
Firstly, one truck crane is arranged in each construction pier position of the lifting mechanism, and sufficient space is ensured for the normal work of the truck crane.
And secondly, the outer mold of the pier body of the template system adopts a large integral steel mold, and a steel panel with the thickness of 6mm is selected. The template manufacturing precision is as follows: the size error is less than 2mm, the inclination angle deviation is less than 1.5mm, and the hole site error is less than 1 mm. In order to ensure the engineering quality, the processing is unified in a factory.
The height of each layer of the lifting linear template is 2.0 m. And after the concrete reaches the form removal strength, taking the bottom section template as a supporting main body, and lifting by using an automobile crane for 6-10 m. The upper section of the formwork is supported on the lower section of the formwork and rises circularly and alternately to complete the pouring of the pier body.
And (3) installing and disassembling the template, wherein the vertical transportation of the construction material is completed by a truck crane. After the template is finished, trial assembly is carried out in a processing plant, the trial assembly is divided into trial assembly in the horizontal direction and trial assembly in the vertical direction, and particularly the trial assembly in the vertical direction after the template is turned over for the first time needs to be paid attention to.
And the safety facility comprises an upper platform fence, a transverse safety net, a fence mesh screen and the like. When the pier body is constructed, a bracket is erected between pier positions, a zigzag ladder stand is arranged on the bracket, the width is 1.2m, and the elevation angle is 45 degrees. Every 6 meters rise and establish a rest platform, the platform is wide 1m, supplies personnel to have a rest, guarantees construction and inspection personnel safe convenient from top to bottom.
Fourthly, the step of the construction system
Lower construction
The erection of the template is directly related to the later construction, and the template is required to be correct in size and horizontal in top.
Template position adjustment
After the templates are assembled and formed, all the bolts do not need to be screwed, and a small amount of loosening margin is reserved. The adjustment of the front and back direction deflection of the template is realized by pulling the chain block to a correct position and plugging a gasket at one end of the bottom edge of the template close to the inclined direction for the adjustment of the left and right deflection. Rubber strips are filled in gaps among the templates to prevent slurry leakage. Because the precision of template making and the initial first section template adjustment is very high, the adjustment range of each time is very small. And after the adjustment is finished, all the bolts are screwed down, and then the concrete can be poured.
Binding reinforcing steel bar
And (4) binding the steel bars strictly according to a design drawing, and welding the joints of the steel bars by adopting double-sided lap welding.
Turning over and lifting form
When the reinforcing steel bars are installed, the next section of formwork can be detached. When the form is removed, the lower form and the upper form of the next section are hung up and down by a chain block, and two steel wire ropes are additionally arranged between the upper form and the lower form. The left, right and upper connecting bolts are removed, and then the lower formwork is separated through two simple strippers arranged on the formworks. And (4) loosening the gourd after demoulding, and hanging the disassembled template on the upper layer by a steel wire rope. And then the templates on the periphery are disassembled one by one and hung on the template on the upper layer. Therefore, the form removal work and the steel bar installation work are carried out simultaneously, the time of at least half a day is saved, and the occupation of the working time of the truck crane is reduced to the maximum extent.
And (5) checking the assembling quality of the template, and meeting the design requirement of the pier. And after the inspection is qualified, wood support is placed, and the lacing wire is screwed.
Pouring concrete
The concrete is intensively mixed by a mixing station, the concrete mixing truck is transported to the position below the pier, the concrete is pumped into a mold by a concrete delivery pump, and the concrete is symmetrically and uniformly poured.
When the concrete is poured to the top of the formwork, the concrete is lower than the opening of the formwork by 1-2 cm, the formwork is turned over for the next section of convenient assembly, and the slab staggering is prevented. And when the strength of the concrete is more than 3MPa, removing floating slurry, roughening the surface of the concrete, and performing the next section of construction.
And (3) observing the positions of the embedded parts and the supporting conditions of the templates, the supports and the like at any time by using a measuring instrument in the pouring process, and immediately correcting and reinforcing the embedded parts if deformation and subsidence exist.
Pier top construction
When the pier top is constructed, an external mold is installed firstly, then a through long pull rod is installed, the upper solid section steel bar is bound, and concrete is poured.
Demolishing of the rollover
When constructing the pier body concrete, the quality and the appearance of the lower concrete and the upper concrete are particularly noticed. Particularly, when the volume of the cast concrete is too large, the hydration heat should be reduced by adopting the same measures as those of the bearing platform.
Pier shaft construction linear control
The linear control of the pier body mainly adopts an outer pier plane control net to eliminate the influence of sun light, fog, night and other calibration on the measurement work.
The key points of the construction process are as follows:
preparation for construction
And (4) according to the measurement and lofting of the center of the foundation top, setting out a side line of the vertical mold, and according to the design requirement of the turnover mold, firstly constructing the part with the height of 8m above the pier body foundation.
Demolishing form
(1) When the template is removed, only the template of 0-6m is removed, and the template of 6-8m is used as a platform for supporting the lower section of the template.
(2) And 4 groups of personnel remove the split bolts, the triangular supports and the templates in opposite directions at the symmetrical positions of the pier body, and the removed parts are lifted to the previous section by upper workers to clean and repair the templates.
(3) Blocking the split bolt holes and spraying the curing liquid.
(4) And (5) when the concrete reaches 1.2MPa, performing ground scabbing on the grouting surface, and binding and welding reinforcing steel bars.
Formwork installation
(1) And measuring a center line, controlling the center by using a plumb ball, and checking and adjusting the position of the outer template.
(2) The formworks are connected and fastened by using split bolts, and the sizes of the center line and the section of the pier are adjusted by using a diagonal cable.
Formwork installation pouring concrete
Pumping concrete into the pier body template by using a pump truck, and tamping by using an inserted vibrator.
The turnover working principle is that the formwork is lifted by a truck crane continuously and turned upwards along with the pouring of concrete of each section until the top of the pier. Because the section pier shaft template of having pour has great frictional force with lower part pier shaft, and the pier shaft has certain slope simultaneously and can prevent the template gliding, so can regard lower part pier shaft template as the supporting platform of upper portion pier shaft template. Generally, according to the height of the pier body, the casting height is about 10m in sections, and the construction of one pier body can be completed by turning the template for 2-3 times. During the turnover construction, the operation platform outside the template can be installed at one time, and is suitable for various concrete transportation and lifting modes, and the construction speed is high; the pumping concrete construction can be carried out, the pumping pipeline can be lengthened synchronously along with the upward turning of the template, and the concrete pouring speed is improved; the pier body construction error can be corrected at any time, the template can be cleaned, trimmed and brushed conveniently in time, and the concrete surface is smooth and clean; the concrete surface after the form removal is smooth and clean, and the defect of slip form construction can be overcome.
Claims (7)
1. The rollover construction method of the round end-shaped solid pier is characterized by comprising the following steps of: the method comprises the following steps:
(1) when the pier body template is processed, according to the height of the pier body, all the arc templates at two ends of the pier body are processed, and only one part of the pier body linear template is processed;
(2) construction preparation, namely measuring and lofting according to the center of a foundation top to form a vertical mold side line;
(3) binding the 1 st section of steel bar;
(4) installing an arc template and a linear template at two ends of the 1 st section;
(5) pouring concrete of section 1;
(6) binding the 2 nd section of steel bar after the 1 st section of concrete reaches the form removal strength,
(7) installing arc templates at two ends of a section 2, removing the section 1 straight line template and reserving a top layer template of the section 1 straight line template, taking the top layer template of the section 1 straight line template as a supporting platform of the section 2 straight line template, and installing the removed straight line template on the basis of the supporting platform as the section 2 straight line template;
(8) pouring the section 2 concrete;
(9) binding the 3 rd section of steel bar after the 2 nd section of concrete reaches the form removal strength,
(10) installing a 3 rd section of arc-shaped template at two ends, dismantling the 2 nd section of linear template and a supporting platform thereof, and reserving a top layer template of the 2 nd section of linear template, wherein the top layer template of the 2 nd section of linear template is used as a supporting platform of the 3 rd section of linear template, and the dismantled section of linear template is installed on the basis of the supporting platform and is used as the 3 rd section of linear template;
(11) pouring the 3 rd section concrete;
(12) after the 3 rd section of concrete reaches the form removal strength, pouring the rest sections of concrete according to the same method until the pier body is capped;
(13) and (5) the pier construction is finished when the pier top is constructed.
2. The rollover construction method for the round-ended solid pier according to claim 1, characterized in that: and the next section of linear template can be disassembled while the upper section of steel bar is bound.
3. The rollover construction method for the round-ended solid pier according to claim 1 or 2, characterized in that: safety facilities in the construction include upper portion platform rail, horizontal safety net, the close mesh net of rail, and during pier shaft construction, set up the support between the pier position, go up and establish "it" font cat ladder, the width is 1.2m, and the angle of elevation is 45, and a rest platform is established to 6 meters high per liter, and the platform is wide 1m, supplies personnel to have a rest, guarantees construction and inspection personnel safe convenient from top to bottom.
4. The rollover construction method for the round-ended solid pier according to claim 1 or 2, characterized in that: after the templates are assembled and formed, all the bolts do not need to be screwed, a small amount of loosening room is reserved, the front and back oblique adjustment of the templates is pulled to a correct position through the chain block, the left and right oblique adjustment is realized by plugging a gasket at one end of the bottom edge of the template close to the oblique direction, a gap between the templates is plugged with a rubber strip to prevent slurry leakage, and after the adjustment is finished, all the bolts are screwed, so that the concrete can be poured.
5. The rollover construction method for the round-ended solid pier according to claim 1 or 2, characterized in that: when the concrete is poured to the top of the formwork, the concrete is lower than the opening of the formwork by 1-2 cm, and the formwork is turned over for the convenience of next section assembly, so that slab staggering is prevented.
6. The rollover construction method for the round-ended solid pier according to claim 1 or 2, characterized in that: the linear template turnover lifting is realized by using a truck crane.
7. The rollover construction method for the round-ended solid pier according to claim 1 or 2, characterized in that: when the next section of linear template is demolded, the lower layer template and the upper layer template are hung up and down tightly by a chain block, two steel wire ropes are additionally arranged between the upper layer template and the lower layer template, connecting bolts on the left, the right and the upper sides are demolded, then the lower layer template is separated by two simple demolders arranged on the templates, the hoist is loosened after demolding, the disassembled template is hung on the upper layer template by the steel wire ropes, and then all the templates on the periphery are disassembled one by one and hung on the upper layer template; the removed template is used as the straight template of the previous section.
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| CN202110394228.3A CN113186824A (en) | 2021-04-13 | 2021-04-13 | Rollover construction method for round-end-shaped solid pier |
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| CN202110394228.3A CN113186824A (en) | 2021-04-13 | 2021-04-13 | Rollover construction method for round-end-shaped solid pier |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114214954A (en) * | 2021-12-23 | 2022-03-22 | 广东科能工程管理有限公司 | Construction method of municipal elevated bridge cast-in-situ pier |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114214954A (en) * | 2021-12-23 | 2022-03-22 | 广东科能工程管理有限公司 | Construction method of municipal elevated bridge cast-in-situ pier |
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