CN112647425A - Integral hoisting construction method for pier stud reinforcement cage - Google Patents
Integral hoisting construction method for pier stud reinforcement cage Download PDFInfo
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- CN112647425A CN112647425A CN202011405504.3A CN202011405504A CN112647425A CN 112647425 A CN112647425 A CN 112647425A CN 202011405504 A CN202011405504 A CN 202011405504A CN 112647425 A CN112647425 A CN 112647425A
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- 230000002787 reinforcement Effects 0.000 title claims abstract description 144
- 238000010276 construction Methods 0.000 title claims abstract description 44
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 82
- 239000010959 steel Substances 0.000 claims abstract description 82
- 238000000034 method Methods 0.000 claims abstract description 36
- 239000004567 concrete Substances 0.000 claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 239000013643 reference control Substances 0.000 claims description 12
- 238000003466 welding Methods 0.000 claims description 12
- 239000011178 precast concrete Substances 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 7
- 210000001503 joint Anatomy 0.000 claims description 5
- 239000010985 leather Substances 0.000 claims description 5
- 239000004575 stone Substances 0.000 claims description 5
- 238000011900 installation process Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000003014 reinforcing effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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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
- E01D21/10—Cantilevered erection
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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
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
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Abstract
The invention discloses a pier stud reinforcement cage integral hoisting construction method, which comprises the following steps: manufacturing a pier stud reinforcement cage and a reinforcement cage positioning bracket background; supporting a bearing platform template; measuring the position of the pier stud reinforcement cage after lofting; binding a bearing platform steel bar; installing a pier stud reinforcement cage pre-buried positioning bracket; after the positioning bracket is installed, the pier stud steel reinforcement cage is fixedly connected with the positioning bracket and fixed by a wind rope; pouring bearing platform concrete; after the bearing platform concrete reaches the design strength, removing the bearing platform template and fixing the pier stud reinforcement cage for pulling the wind rope; hoisting the pier stud template and fixing by using a wind rope; and pouring pier column concrete. By adopting the method to construct the pier column, the construction progress is obviously improved.
Description
Technical Field
The invention relates to a method for hoisting a bridge pier stud, in particular to a method for mechanically forming a cage on a pier stud steel bar by adopting a background and integrally hoisting and embedding the pier stud steel bar on site.
Background
Along with the development of traffic road construction, more and more elevated road bridges need large-scale pier construction, and this type of large-scale pier generally all adopts steel structure ligature's framework of steel reinforcement, then carries out the construction of pouring of concrete. Because the vertical butt joint of reinforcing bar needs to be realized to the reinforcing bar among the framework of steel reinforcement to satisfy framework of steel reinforcement's intensity requirement. In the construction process of the steel reinforcement framework in the traditional concrete, the whole prefabrication of the steel reinforcement framework is required to be carried out according to the arrangement structure of the embedded steel bars in the concrete. For large-scale pier, its overall height and structure are comparatively huge, need carry out the setting up of peripheral various auxiliary frame bodies according to the construction requirement to carry out the preliminary location after hoisting and the installation one by one of reinforcing bar butt joint, its construction degree of difficulty and construction procedure are too complicated, consume the manual work more, construction cycle is long, and can not control the straightness that hangs down of pier shaft steel reinforcement cage well in the work progress, influence pier stud construction quality and engineering progress.
At the present stage, the application of the integral hoisting construction process of the pier stud reinforcement cage is more and more extensive. This technology easy operation practices thrift the cost of labor, can shorten construction cycle, but to the great steel reinforcement cage of volume and weight, directly set up the welding that the hoisting point destroyed easily between main muscle and the stirrup on steel reinforcement cage single loop stirrup, is difficult to guarantee pier stud steel reinforcement cage holistic stability.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a pier stud reinforcement cage integral hoisting construction method which can enable a pier stud reinforcement cage to be hoisted in place quickly and can ensure the integral stability of the reinforcement cage in the hoisting process.
The integral hoisting construction method of the pier stud reinforcement cage comprises the following steps:
step one, construction lofting:
firstly, taking a transverse connecting line of central points of two bearing platforms which are arranged in parallel at intervals left and right and are to be constructed in a foundation pit and a symmetrical central line of the two bearing platforms as reference lines, determining a transverse control line and a longitudinal control line of a pier body by measuring and paying off through a total station, and taking the transverse control line and the longitudinal control line as reference control lines for pier construction after rechecking, wherein the transverse control line of the pier body is superposed with the transverse connecting line of the central points of the bearing platforms, and the longitudinal control lines respectively pass through the central points of the two bearing platforms and are vertical to the transverse connecting lines;
secondly, on the basis of the pier column construction reference control line, respectively positioning four installation positioning points of each pier column reinforcement cage to be installed above the bearing platform on the pier construction reference control line by using points on the diameter of the pier column reinforcement cage;
step two, manufacturing a pier stud reinforcement cage, and then respectively arranging a top hoisting point group and a bottom hoisting point group at the upper part and the lower part of the outer wall of the pier stud reinforcement cage along the same longitudinal position parallel to the central axis of the pier stud reinforcement cage, wherein each of the top hoisting point group and the bottom hoisting point group respectively comprises a plurality of hoisting points, the plurality of hoisting points of the same hoisting point group are arranged at intervals from top to bottom, the plurality of hoisting points of the same hoisting point group are respectively fixedly connected with one end of a hoisting rope and the other ends of all the hoisting ropes are jointly connected together to serve as a horizontal hoisting point;
step three, manufacturing an integral hoisting structure of the pier stud reinforcement cage:
the method comprises the following steps that firstly, four frame channel steel with the same structure are arranged into a square frame, and then two diagonal bracing channel steel are arranged on the diagonal through length of the square frame;
secondly, sequentially welding the intersection points of the four frame channel steel to form a closed square frame, welding the intersection points of the two inclined strut channel steel and the closed square frame, and finally welding the intersection positions of the two inclined strut channel steel to serve as a lifting point, wherein a lifting rope is connected to the lifting point and serves as a vertical lifting point;
step four, fixing the integral hoisting structure of the pier stud reinforcement cage and the top end of the pier stud reinforcement cage by using a buckle;
step five, installing a pier stud reinforcement cage positioning and fixing support:
respectively installing a bearing platform template and binding and installing a bearing platform steel reinforcement cage at two bearing platform positions set in a foundation pit, embedding a pier column steel reinforcement cage positioning bracket in the bearing platform steel reinforcement cage according to four installation positioning points on a reference control line of each pier column construction in the process, adjusting the top elevation of the pier column steel reinforcement cage positioning bracket to reach a design value, and enabling the diameter of the pier column steel reinforcement cage bracket to be consistent with the diameter of the bottom surface of the pier column steel reinforcement cage;
step six, integrally hoisting the two pier stud reinforcement cages by adopting the same method, wherein the hoisting method of each pier stud reinforcement cage comprises the following steps:
firstly, a crane is respectively connected with two horizontal hoisting points of a pier stud reinforcement cage through two auxiliary lifting hooks, and the crane is connected with a vertical hoisting point through a main lifting hook;
secondly, a main lifting hook and two auxiliary lifting hooks of a lifting crane simultaneously lift the pier stud reinforcement cage to a preset height; adjusting the lengths of the main lifting hook and the auxiliary lifting hook to enable the pier stud reinforcement cage to move in the vertical direction until the pier stud reinforcement cage reaches a vertical state;
thirdly, removing the connection between the two auxiliary lifting hooks and the horizontal lifting points of the pier stud reinforcement cage;
fourthly, vertically installing the pier stud reinforcement cage into the foundation pit by a crane, and welding and fixing the bottom of the pier stud reinforcement cage on a pre-embedded pier stud reinforcement cage positioning bracket;
fifthly, fixing the peripheries of the two pier stud reinforcement cages with ground anchors for wind ropes of the reinforcement cages and precast concrete blocks on the ground respectively;
sixthly, pouring concrete at the position of the bearing platform reinforcement cage, removing a bearing platform template after the strength of the bearing platform concrete reaches the design requirement, and then removing a reinforcement cage cable rope;
seventhly, installing pier column templates on each pier column reinforcement cage by adopting the same method, wherein the installation process of each pier column template is as follows:
firstly, hoisting a semicircular steel template to be sleeved on a pier stud reinforcement cage, then hoisting another semicircular steel template to be sleeved on the pier stud reinforcement cage, and butting the two semicircular steel templates to form a round steel template;
secondly, connecting the two semicircular steel templates through bolts and male and female buttons arranged at the butt joint so as to fix the two semicircular steel templates together;
thirdly, fixing the pier column template and the precast concrete block by using a template wind rope;
step eight, filling mountain leather stones in the foundation pit until the ground height is reached and compacting; digging a drainage ditch on the ground outside the scaffold to be installed;
step nine, erecting scaffolds around the two pier stud templates by adopting the socket type disc buckle type steel pipe support, wherein the scaffolds are higher than the tops of the pier stud templates by 1-1.2 m, and the higher scaffolds serve as edge protection of the pier top platform; then fixing the scaffold wind-pulling ropes and the precast concrete blocks around the scaffold; finally, fully paving scaffold boards on the scaffold at the top of the pier stud template to form a closed construction operation platform;
respectively popping up a pouring elevation position line by using ink lines at the periphery of the inner wall of each pier stud template, and horizontally layering concrete pouring according to the elevation position line, wherein the thickness of each layer is 0.25-0.3 m; and tamping the concrete in the pouring process.
The invention has the beneficial effects that: the pier stud reinforcement cage can be quickly hoisted in place, and the overall stability of the reinforcement cage in the hoisting process can be ensured.
Drawings
Fig. 1 is a schematic positioning diagram of an integral hoisting structure of a reinforcement cage in the integral hoisting construction method of a pier stud reinforcement cage of the present invention;
FIG. 2 is a schematic diagram of the arrangement of lifting lugs and lifting points of a reinforcement cage adopted in the method of the present invention;
FIG. 3 is a schematic diagram showing the matching of a hoisting structure on a steel reinforcement cage and a hoisting steel wire rope in the method of the invention;
FIG. 4 is a schematic diagram of a hoisting process of a reinforcement cage in the method of the present invention;
FIG. 5 is a schematic illustration of the reinforcement cage in position during the method of the present invention;
FIG. 6 is a schematic view of the scaffold set up in the method of the present invention;
fig. 7 is a schematic diagram of assembling pier stud steel templates adopted in the method of the invention.
Detailed Description
In order that those skilled in the art can better understand the present invention, the following technical solutions are further described with reference to the accompanying drawings and examples.
The integral hoisting construction method for the pier stud reinforcement cage, disclosed by the invention, comprises the following steps of:
step one, construction lofting:
firstly, taking a transverse connecting line 1 of central points of two bearing platforms which are arranged in parallel at intervals left and right in a foundation pit and are to be constructed and a symmetrical central line 2 of the two bearing platforms as reference lines, determining a transverse control line and a longitudinal control line 3 of a pier body by measuring and paying off through a total station, and taking the transverse control line and the longitudinal control line as reference control lines for pier construction after rechecking. The transverse control line of the pier body of the pier is superposed with the transverse connecting line 1 of the central points of the bearing platforms, and the longitudinal control line 3 respectively passes through the central points of the two bearing platforms and is vertical to the transverse connecting line 1;
and secondly, respectively positioning four installation positioning points 1-1, 1-2, 1-3 and 1-4 of each pier column reinforcement cage to be installed above the bearing platform on the pier construction reference control line by using points on the diameter of the pier column reinforcement cage on the basis of the pier column construction reference control line.
Step two, manufacturing a pier stud reinforcement cage, and then respectively arranging a top hoisting point group 10 and a bottom hoisting point group 9 at the upper part and the lower part of the outer wall of the pier stud reinforcement cage along the same longitudinal position parallel to the central axis of the pier stud reinforcement cage, wherein each of the top hoisting point group 10 and the bottom hoisting point group 9 respectively comprises a plurality of hoisting points, a plurality of hoisting points 10-1 and 9-1 of the same hoisting point group are arranged at intervals up and down, the plurality of hoisting points of the same hoisting point group are respectively fixedly connected with one end of a hoisting rope and the other ends of all the hoisting ropes are jointly connected together to serve as a horizontal hoisting point;
the distance between a plurality of lifting points 10-1 and 9-1 of the same preferred lifting point group is 10 cm; the distance between the lowest lifting point of the top lifting point group 10 and the uppermost lifting point of the bottom lifting point group 9 and the top and the bottom of the reinforcement cage are L/4 of the total length of the reinforcement cage respectively. Therefore, the effect of balanced hoisting and transferring can be achieved.
Step three, manufacturing an integral hoisting structure of the pier stud reinforcement cage:
firstly, four frame channel steels 4-1, 4-2, 4-3 and 4-4 with the same structure are arranged into a square frame 4, and then two diagonal bracing channel steels 4-5 and 4-6 are arranged on the diagonal through length of the square frame 4;
and secondly, sequentially welding intersection points 5-1, 5-2, 5-3, 5-4 and 5-5 of four frame channel steel to form a closed square frame, welding intersection points of two inclined strut channel steel 4-5 and 4-6 and the closed square frame, finally welding intersection positions of the two inclined strut channel steel 4-5 and 4-6 to serve as a lifting point, and connecting a lifting rope at the lifting point to serve as a vertical lifting point 6.
Step four, fixing the integral hoisting structure of the pier stud reinforcement cage and the top end of the pier stud reinforcement cage 8 by using a buckle 7;
step five, installing a pier stud reinforcement cage positioning and fixing support:
in the process, a bearing platform template is respectively installed at two bearing platform positions set in a foundation pit, and a bearing platform steel reinforcement cage is bound and installed (by adopting the existing method), wherein a pier column steel reinforcement cage positioning support 13 is pre-embedded in the bearing platform steel reinforcement cage according to four installation positioning points 1-1, 1-2, 1-3 and 1-4 on a reference control line of each pier column construction, the height of the top of the pier column steel reinforcement cage positioning support 13 is adjusted to reach a design value, and the diameter of the pier column steel reinforcement cage support 13 is consistent with the diameter of the bottom surface of the pier column steel reinforcement cage.
Step six, integrally hoisting the two pier stud reinforcement cages by adopting the same method, wherein the hoisting method of each pier stud reinforcement cage comprises the following steps:
firstly, a crane is respectively connected with two horizontal hoisting points of a pier stud reinforcement cage 8 through two auxiliary lifting hooks 11, and the crane is connected with a vertical hoisting point 6 through a main lifting hook 12;
secondly, lifting the pier stud reinforcement cage 8 to a preset height by a main lifting hook 12 and two auxiliary lifting hooks 11 of the crane simultaneously; adjusting the lengths of the main lifting hook and the auxiliary lifting hook to enable the pier stud reinforcement cage 8 to move in the vertical direction until the pier stud reinforcement cage 8 is in a vertical state;
thirdly, removing the connection between the two auxiliary lifting hooks 11 and the horizontal lifting points 9 and 10 of the pier stud reinforcement cage;
fourthly, the crane vertically loads the pier stud reinforcement cage 8 into the foundation pit, and the bottom of the crane is welded and fixed on the embedded pier stud reinforcement cage positioning support 13, so that the pier stud reinforcement cage 8 is hoisted into the groove once and is not connected separately, and hoisting point conversion is not carried out in the vertical state process, thereby saving manpower and improving safety.
Fifthly, fixing the peripheries of the two pier stud reinforcement cages with ground anchors of the reinforcement cages for wind ropes 14 and precast concrete blocks 15 on the ground respectively;
the preferable steel reinforcement cage cable wind rope adopts a steel wire rope, and the included angle between the steel reinforcement cage cable wind rope and the ground is 30-45 degrees, preferably 30 degrees, so that the steel wire rope can be ensured to generate good tensile force.
Sixthly, pouring concrete at the position of the bearing platform reinforcement cage, removing a bearing platform template after the strength of the bearing platform concrete reaches the design requirement, and then removing a reinforcement cage cable rope;
seventhly, installing pier column templates on each pier column reinforcement cage by adopting the same method, wherein the installation process of each pier column template is as follows:
firstly, hoisting one semicircular steel template 22-1 to be sleeved on one pier stud reinforcement cage, then hoisting the other semicircular steel template 22-2 to be sleeved on the pier stud reinforcement cage, and butting the two semicircular steel templates 22-1 and 22-2 to form a round steel template; each semicircular steel template can be formed by connecting an upper section and a lower section.
Secondly, connecting the male and female buckles 23 arranged at the butt joint of the two semicircular steel templates through bolts 24 to fix the two semicircular steel templates together;
thirdly, fixing the pier column template and the precast concrete block 15 by using a template wind rope;
step eight, filling mountain leather stones 20 in the foundation pit until the ground height and compacting; the drain 21 is dug on the ground outside the scaffold to be installed, typically at 1m outside the scaffold 21.
Step nine, erecting a scaffold around the two pier stud templates by adopting a socket type disc buckle type steel pipe support, wherein the scaffold is higher than the tops of the pier stud templates by 1-1.2 meters (for example, the height can be 1 meter, 1.1 meter, 1.2 meters and the like), and the higher scaffold serves as the edge protection of the pier top platform; then, fixing the scaffold wind-pulling ropes with the precast concrete blocks 15 at the periphery of the scaffold; and finally, fully paving scaffold boards on the scaffold at the top of the pier stud template to form a closed construction operation platform.
As an embodiment of the present invention, the process of setting up the scaffold is:
firstly, setting a rod adjustable base 16 on a mountain leather stone 20, and then setting a first layer of upright rods 17 on the adjustable base 16;
secondly, erecting a first layer of horizontal rods 18 between the first layer of upright rods 17;
thirdly, an inclined strut 19 is erected between the first-layer upright rod 17 and the first-layer horizontal rod 18 to form a basic frame body unit;
and fourthly, continuously repeating the first step on the basis of the basic frame body unit, binding a next layer of upright rods on the upper layer of upright rods 17, and repeating the second step and the third step to expand and erect the integral support system.
And step ten, respectively ejecting pouring elevation position lines by using ink lines around the inner wall of each pier stud template so as to conveniently control the elevation. The concrete pouring is carried out by adopting horizontal layering according to the elevation position line, and the thickness of each layer is 0.25-0.3 m (for example, the thickness can be 0.25 m, 0.28 m, 0.3m and the like). The concrete is tamped in the pouring process to prevent leakage vibration. Preferably, the vibrating distance is not more than 1.5 times of the action range of the vibrating rod, the distance of 5-10 cm is kept between the vibrating rod and the inner wall of the pier stud template, when the next layer of concrete is poured, the vibrating rod is inserted into the lower layer of concrete for 5-10 cm, and the vibrating rod is slowly lifted out after the vibrating of each position is finished.
Claims (7)
1. The integral hoisting construction method of the pier stud reinforcement cage is characterized by comprising the following steps of:
step one, construction lofting:
firstly, taking a transverse connecting line (1) of central points of two bearing platforms which are arranged in parallel at intervals left and right and are to be constructed in a foundation pit and a symmetrical central line (2) of the two bearing platforms as datum lines, setting out a transverse control line and a longitudinal control line (3) of a pier body by measuring and setting out with a total station, and taking the transverse control line and the longitudinal control line as reference control lines for pier construction after rechecking, wherein the transverse control line of the pier body is superposed with the transverse connecting line of the central points of the bearing platforms, and the longitudinal control lines respectively pass through the central points of the two bearing platforms and are vertical to the transverse connecting line;
secondly, on the basis of the pier column construction reference control line, respectively positioning four installation positioning points of each pier column reinforcement cage to be installed above the bearing platform on the pier construction reference control line by using points on the diameter of the pier column reinforcement cage;
step two, manufacturing a pier stud reinforcement cage, and then respectively arranging a top hoisting point group (10) and a bottom hoisting point group (9) at the upper part and the lower part of the outer wall of the pier stud reinforcement cage along the same longitudinal position parallel to the central axis of the pier stud reinforcement cage, wherein each top hoisting point group and each bottom hoisting point group respectively comprise a plurality of hoisting points, the plurality of hoisting points of the same hoisting point group are arranged at intervals from top to bottom, the plurality of hoisting points of the same hoisting point group are respectively fixedly connected with one end of a hoisting rope and the other ends of all the hoisting ropes are jointly connected together to serve as a horizontal hoisting point;
step three, manufacturing an integral hoisting structure of the pier stud reinforcement cage:
the method comprises the following steps that firstly, four frame channel steels with the same structure are arranged into a square frame (4), and then two diagonal bracing channel steels are arranged on the diagonal through length of the square frame;
secondly, sequentially welding the intersection points of the four frame channel steel to form a closed square frame, welding the intersection points of the two inclined strut channel steel and the closed square frame, and finally welding the intersection positions of the two inclined strut channel steel to serve as a lifting point, wherein a lifting rope is connected to the lifting point and serves as a vertical lifting point (6);
fixing the integral hoisting structure of the pier stud reinforcement cage and the top end of the pier stud reinforcement cage (8) by using a buckle (7);
step five, installing a pier stud reinforcement cage positioning and fixing support:
respectively installing a bearing platform template and binding and installing a bearing platform steel reinforcement cage at two bearing platform positions set in a foundation pit, embedding a pier column steel reinforcement cage positioning bracket (13) in the bearing platform steel reinforcement cage according to four installation positioning points on a reference control line of each pier column construction in the process, adjusting the top elevation of the pier column steel reinforcement cage positioning bracket to reach a design value, and enabling the diameter of the pier column steel reinforcement cage bracket to be consistent with the diameter of the bottom surface of the pier column steel reinforcement cage;
step six, integrally hoisting the two pier stud reinforcement cages by adopting the same method, wherein the hoisting method of each pier stud reinforcement cage comprises the following steps:
firstly, a crane is respectively connected with two horizontal hoisting points of a pier stud reinforcement cage through two auxiliary lifting hooks (11), and the crane is connected with a vertical hoisting point through a main lifting hook (12);
secondly, a main lifting hook and two auxiliary lifting hooks of a lifting crane simultaneously lift the pier stud reinforcement cage to a preset height; adjusting the lengths of the main lifting hook and the auxiliary lifting hook to enable the pier stud reinforcement cage to move in the vertical direction until the pier stud reinforcement cage reaches a vertical state;
thirdly, removing the connection between the two auxiliary lifting hooks and the horizontal lifting points of the pier stud reinforcement cage;
fourthly, vertically installing the pier stud reinforcement cage into the foundation pit by a crane, and welding and fixing the bottom of the pier stud reinforcement cage on a pre-embedded pier stud reinforcement cage positioning bracket (13);
fifthly, fixing the peripheries of the two pier stud reinforcement cages with ground anchors of the reinforcement cages for wind ropes (14) and precast concrete blocks (15) on the ground respectively;
sixthly, pouring concrete at the position of the bearing platform reinforcement cage, removing a bearing platform template after the strength of the bearing platform concrete reaches the design requirement, and then removing a reinforcement cage cable rope;
seventhly, installing pier column templates on each pier column reinforcement cage by adopting the same method, wherein the installation process of each pier column template is as follows:
firstly, hoisting a semicircular steel template (22-1) to be sleeved on a pier stud reinforcement cage, then hoisting another semicircular steel template (22-2) to be sleeved on the pier stud reinforcement cage, and butting the two semicircular steel templates to form a round steel template;
secondly, connecting the two semicircular steel templates through bolts and male and female buttons arranged at the butt joint so as to fix the two semicircular steel templates together;
thirdly, fixing the pier column template and the precast concrete block by using a template wind rope;
step eight, filling mountain leather stones (20) in the foundation pit until the ground height is reached, and compacting; digging a drainage ditch (21) on the ground outside the scaffold to be installed;
step nine, erecting scaffolds around the two pier stud templates by adopting the socket type disc buckle type steel pipe support, wherein the scaffolds are higher than the tops of the pier stud templates by 1-1.2 m, and the higher scaffolds serve as edge protection of the pier top platform; then fixing the scaffold wind-pulling ropes and the precast concrete blocks around the scaffold; finally, fully paving scaffold boards on the scaffold at the top of the pier stud template to form a closed construction operation platform;
respectively popping up a pouring elevation position line by using ink lines at the periphery of the inner wall of each pier stud template, and horizontally layering concrete pouring according to the elevation position line, wherein the thickness of each layer is 0.25-0.3 m; and tamping the concrete in the pouring process.
2. The pier stud reinforcement cage integral hoisting construction method according to claim 1, characterized in that: the distance between a plurality of lifting points of the same lifting point group is 10 cm; the distance between the lowest lifting point of the top lifting point group and the uppermost lifting point of the bottom lifting point group and the top and the bottom of the reinforcement cage are respectively L/4 of the total length of the reinforcement cage.
3. The pier stud reinforcement cage integral hoisting construction method according to claim 1 or 2, characterized in that: the steel reinforcement cage cable wind rope adopts a steel wire rope, and the included angle between the steel reinforcement cage cable wind rope and the ground is 30-45 degrees.
4. The pier stud reinforcement cage integral hoisting construction method according to claim 3, characterized in that: the included angle between the steel reinforcement cage cable wind rope and the ground is 30 degrees.
5. The pier stud reinforcement cage integral hoisting construction method according to claim 4, characterized in that: each semi-circular steel template is formed by connecting an upper section and a lower section.
6. The pier stud reinforcement cage integral hoisting construction method according to claim 5, characterized in that: the process of building the scaffold comprises the following steps:
firstly, setting a rod adjustable base on the mountain leather stone, and then setting a first layer of upright rods on the adjustable base;
secondly, erecting a first layer of horizontal rods between the first layer of upright rods;
thirdly, erecting an inclined strut between the first-layer upright rod and the first-layer horizontal rod to form a basic frame body unit;
and fourthly, continuously repeating the first step on the basis of the basic frame body unit, binding a next layer of upright rods on the upper layer of upright rods, and repeating the second step to the third step to expand and erect the integral frame system.
7. The pier stud reinforcement cage integral hoisting construction method according to claim 6, characterized in that: and step ten, the vibration distance is not more than 1.5 times of the action range of the vibrating spear, the distance of 5-10 cm is kept between the vibration distance and the inner wall of the pier column template, when the next layer of concrete is poured, the vibrating spear is inserted into the lower layer of concrete for 5-10 cm, and the vibrating spear is slowly lifted out after vibration at each position is completed.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115012651A (en) * | 2022-06-29 | 2022-09-06 | 中冶建工集团有限公司 | Construction method for large-section turnover formwork small platform |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115012651A (en) * | 2022-06-29 | 2022-09-06 | 中冶建工集团有限公司 | Construction method for large-section turnover formwork small platform |
| CN115012651B (en) * | 2022-06-29 | 2024-05-28 | 中冶建工集团有限公司 | Construction method for large-section turnover formwork small platform |
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