CN115387234B - A formwork system and construction method for the lower cross beam of an ultra-high diamond-shaped tower pier - Google Patents
A formwork system and construction method for the lower cross beam of an ultra-high diamond-shaped tower pier Download PDFInfo
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- CN115387234B CN115387234B CN202211099835.8A CN202211099835A CN115387234B CN 115387234 B CN115387234 B CN 115387234B CN 202211099835 A CN202211099835 A CN 202211099835A CN 115387234 B CN115387234 B CN 115387234B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Abstract
本申请公开了一种超高菱形塔墩下横梁的模板系统，包括设置于塔墩顶部的横梁支架，横梁支架包括若干根钢管立柱以及设置于钢管立柱远离塔墩的一端的牛腿托架，塔墩顶部设有第一预埋件，第一预埋件的一端预埋于塔墩内，另一端伸出塔墩与钢管立柱固定连接，相邻的两根钢管立柱之间设有用于连接固定两者的连接组件；相邻的两个牛腿托架之间设有用于使得两者相互固定的托架连接系，牛腿托架包括至少两个相互拼接的半托架，两个半托架的交接处设有连接板，牛腿托架上设有贝雷梁。本申请具有有效地减少了安装横梁支架的用钢量，并且保证了贝雷梁对底模模板的支撑强度，又有效减轻了采取钢牛腿与钢拱架进行支撑的吊装工作量与安装难度的效果。
The present application discloses a formwork system for the lower crossbeam of an ultra-high diamond-shaped tower pier, comprising a crossbeam support arranged at the top of the tower pier, the crossbeam support comprising a plurality of steel pipe columns and a corbel bracket arranged at one end of the steel pipe column away from the tower pier, a first embedded part is arranged at the top of the tower pier, one end of the first embedded part is embedded in the tower pier, and the other end extends out of the tower pier and is fixedly connected to the steel pipe column, a connecting assembly for connecting and fixing the two adjacent steel pipe columns is arranged between the two adjacent corbel brackets, a bracket connection system for fixing the two mutually is arranged between the two adjacent corbel brackets, the corbel bracket comprises at least two mutually spliced half brackets, a connecting plate is arranged at the junction of the two half brackets, and a Bailey beam is arranged on the corbel bracket. The present application has the effect of effectively reducing the amount of steel used in installing the crossbeam support, and ensuring the supporting strength of the Bailey beam on the bottom formwork, and effectively reducing the lifting workload and installation difficulty of using steel corbels and steel arch frames for support.
Description
Technical Field
The application relates to the technical field of bridge construction, in particular to a template system of a lower cross beam of an ultra-high diamond tower pier and a construction method.
Background
The cable-stayed bridge, also called as diagonal bridge, is a bridge in which the main girder is directly pulled on the bridge tower by using several guys, and is a structural system formed from bearing tower, tension rope and bearing bent beam body. The cable-stayed bridge has the advantages of attractive appearance, greatly reduced span, reduced structural weight and the like, and is widely applied to bridge construction design.
The cable-stayed bridge mainly comprises a cable tower, a main beam and stay cables, wherein the cable tower structure is of various types and is mainly selected according to the arrangement requirements of the stay cables, the bridge deck width, the main beam span and other factors. In civil engineering, particularly in mountainous areas, rhombic cable towers are more in construction engineering. The diamond cable tower comprises tower piers, lower tower columns, middle tower columns and upper tower columns, wherein the tower piers are vertically arranged on the ground, the two lower tower columns incline outwards, and the two middle tower columns incline inwards with the upper tower columns. The lower beam is arranged at the intersection of the lower tower column and the folding line of the middle tower column, is complex in position stress, large in structural size and large in concrete square quantity, belongs to high-altitude construction operation, and is a high-risk link in cable-stayed bridge construction. In the prior art, the construction mode of the lower beam mainly comprises two modes, namely, under the condition that the lower beam is not high in ground clearance, a floor steel bracket is adopted as a beam bracket, a bottom die template for supporting the lower beam is adopted to construct the lower beam, and a steel bracket and a steel arch frame are adopted as the beam bracket for supporting the bottom die template for constructing the lower beam.
However, the existing construction mode for constructing the lower beam requires more steel pipe materials, and more bracket wall-attached embedded parts are required to be installed, so that the required steel consumption is large, and the hoisting workload and the installation difficulty are large when the beam bracket is installed and removed.
Disclosure of Invention
In order to overcome the defects of large steel consumption, large hoisting workload and large installation difficulty of a related construction mode for constructing the lower beam, the application provides a template system of the lower beam of the ultra-high diamond tower pier and a construction method.
The application provides a template system of a lower cross beam of an ultra-high diamond tower pier, which adopts the following technical scheme:
The template system of the lower cross beam of the ultra-high diamond tower pier comprises a cross beam support arranged at the top of the tower pier, wherein the cross beam support comprises a plurality of steel pipe columns and bracket brackets arranged at one ends of the steel pipe columns away from the tower pier, a first embedded part is arranged at the top of the tower pier, one end of the first embedded part is embedded in the tower pier, the other end of the first embedded part extends out of the tower pier and is fixedly connected with the steel pipe columns, a connecting component used for connecting and fixing the two steel pipe columns is arranged between the two adjacent steel pipe columns, a bracket connecting system used for mutually fixing the two bracket brackets is arranged between the two adjacent bracket brackets, each bracket comprises at least two half brackets which are mutually spliced, a connecting plate is fixedly arranged at the joint of each half bracket, and a beret beam used for supporting a bottom die template is arranged on each bracket.
Through adopting above-mentioned technical scheme, before constructing the bottom end rail, need install the crossbeam support at the tower mound top, at first pre-buried first built-in fitting at the tower mound top, fix steel pipe stand and first built-in fitting each other again, reduced the steel consumption of installing the crossbeam support among the related art effectively. After the steel pipe stand is installed, the bracket is installed between the two lower tower columns, the semi-bracket is fixedly installed on the side wall of the lower tower columns, the connecting plate is welded at the joint of the semi-bracket, the support strength of the bailey beam to the bottom die template is guaranteed through the arrangement of the bracket, and the lifting workload and the installation difficulty of supporting by adopting the steel bracket and the steel arch frame are effectively reduced.
Preferably, the semi-bracket comprises a horizontal rod and a bracket arranged on one side of the horizontal rod, which faces the tower pier, a second embedded part is arranged on the side wall of the lower tower column, one end of the second embedded part, which is far away from the lower tower column, is fixedly arranged on one side of the horizontal rod, which faces the tower pier, a third embedded part is further arranged on the side wall of the lower tower column, one end of the third embedded part, which is far away from the lower tower column, is fixedly connected with one end of the bracket, which is far away from the horizontal rod, is fixedly connected with the bottom side of the horizontal rod, a first distribution beam is arranged on the bottom end of the steel pipe column, and one side, which is far away from the steel pipe column, is fixedly connected with the horizontal rod.
Through adopting above-mentioned technical scheme, when installing the bracket, first in the lateral wall installation second built-in fitting and the third built-in fitting of lower column, the one end that the horizontal pole is close to lower column is fixed connection with second built-in fitting again, the one end and the horizontal pole fixed connection of bracket, the one end fixed connection in the third built-in fitting of horizontal pole is kept away from to the bracket, through setting up many horizontal poles, support the horizontal pole with the setting of bracket, both guaranteed the supporting strength to die block template, effectively alleviateed again and adopted the hoist and mount work load and the installation degree of difficulty that steel bracket and steel bow member supported.
Preferably, the bracket connection system comprises a plurality of longitudinal rods and inclined rods arranged between two adjacent longitudinal rods, two ends of each longitudinal rod are respectively and fixedly arranged on the horizontal rods of two adjacent half brackets, and two ends of each inclined rod are fixedly arranged on two adjacent longitudinal rods.
Through adopting above-mentioned technical scheme, after setting up the bracket, set up vertical pole and diagonal bar between adjacent horizon bar for two adjacent bracket interconnect are fixed, have strengthened bracket's supporting strength to the bailey roof beam effectively.
Preferably, the steel pipe column comprises a plurality of steel pipe columns spliced with each other, the upper steel pipe column and the lower steel pipe column are fixedly connected through flanges, and the bottom end of the steel pipe column is fixedly connected with the first embedded part.
Through adopting above-mentioned technical scheme, before constructing the bottom end rail, first built-in fitting is pre-buried in the tower mound at first, with steel-pipe column and first built-in fitting fixed connection again, then pass through flange fixed connection with many steel-pipe columns to support bracket.
Preferably, the first embedded part comprises a plurality of hooking reinforcing bars arranged in the tower pier and a fixing plate arranged at the top end of the hooking reinforcing bars, the fixing plate faces towards the top surface of the tower pier in a way that one side of the hooking reinforcing bars is abutted to the top surface of the tower pier, a plurality of supporting plates are arranged on one side of the fixing plate, which is away from the tower pier, and the supporting plates are fixedly connected with the bottom end of the steel pipe column.
Through adopting above-mentioned technical scheme, when the bottom of steel-pipe column is placed on the fixed plate, backup pad butt in the lateral wall of steel-pipe column, welds backup pad and steel-pipe column's butt department again to make steel-pipe column and first built-in fitting mutually fixed.
Preferably, a plurality of lateral limit steel plates are arranged on one side, away from the second embedded part, of the horizontal rod, steel wedges are arranged between the lateral limit steel plates, second distribution beams are arranged on the steel wedges, and one ends of the second distribution beams are abutted to the steel wedges.
Through adopting above-mentioned technical scheme, set up steel voussoir and second distribution roof beam between the spacing steel sheet of side direction to the structural strength of horizon bar has been strengthened, and then the supporting strength of bracket to the bottom end rail has been strengthened.
Preferably, a triangular bracket is arranged on one side of the steel wedge block of the second distribution Liang Beili, the triangular bracket is arranged on one side of the bailey beam facing the lower tower column, and a tight supporting part for tightly supporting the bailey beam and the triangular bracket is arranged between the triangular bracket and the bailey beam.
Through adopting above-mentioned technical scheme, when hoisting the bailey beam to the top of bracket, the tripod of bailey beam both sides plays spacing effect to the bailey beam to through the setting of supporting the tight portion, reduce effectively that the bailey beam takes place the condition of shifting when fixing the bailey beam.
Preferably, a supporting rod is arranged in the triangular bracket, and two ends of the supporting rod are respectively arranged on the right-angle side and the oblique side of the triangular bracket.
By adopting the technical scheme, the structural strength of the triangular bracket is improved.
Preferably, the connecting assembly comprises a connecting rod, two ends of the connecting rod are fixedly connected with two adjacent steel pipe columns respectively, and an inclined stay rod is further arranged between the two adjacent connecting rods.
Through adopting above-mentioned technical scheme, after the steel-pipe column installation is accomplished, install the connecting rod between two adjacent steel-pipe columns to connect fixed two adjacent steel-pipe columns, the setting of cooperation diagonal brace has further strengthened the support strength of steel-pipe column to the bracket.
The application aims at providing a construction method of the lower cross beam of the ultra-high diamond tower pier.
The application provides a construction method of a lower cross beam of an ultra-high diamond tower pier, which adopts the following scheme:
a construction method of a lower cross beam of an ultra-high diamond tower pier comprises the steps of,
S1, construction paying-off, namely performing construction paying-off on the top of a tower pier of the diamond cable tower according to drawing illustration and construction requirements;
S2, mounting a steel pipe column and a first embedded part, namely embedding the first embedded part at the top of a tower pier, mounting the steel pipe column on the first embedded part, mounting the steel pipe column between two lower tower columns, wherein the steel pipe column comprises a plurality of steel pipe columns which are mutually spliced, mutually fixing the two steel pipe columns through flanges, and mounting a plurality of connecting rods and diagonal braces between the two adjacent steel pipe columns;
s3, mounting a first distribution beam, namely arranging pile caps at the top ends of the steel pipe upright posts, and fixing the joint of the first distribution beam and the pile caps of each group of steel pipe upright posts by welding;
S4, mounting the bracket, the second embedded part and the third embedded part, wherein the second embedded part and the third embedded part are embedded in the side wall of the lower tower column, and the half bracket is hoisted between the two lower tower columns, so that the horizontal rod is fixedly connected with the second embedded part, and a second distribution beam is arranged at one end, close to the lower tower column, of the horizontal rod, so that the structural strength of the horizontal rod is enhanced. One end of the bracket, which is far away from the horizontal rod, is fixedly connected with a third embedded part, and after the two half brackets are fixed, a connecting plate is welded at the joint of the two half brackets;
S5, installing a sand box on a horizontal rod, erecting a third distribution beam on the sand box, and placing the sand box at the intersection of the horizontal rod and the third distribution beam;
S6, installing a fourth distribution beam and a bottom die, namely longitudinally erecting the fourth distribution beam on the Bailey beam, and installing a bottom die template on the fourth distribution beam;
And S7, installing the bottom die steel reinforcement framework, the web steel reinforcement framework and the prestress steel strands, namely after the cross beam support is pre-pressed, installing the bottom die steel reinforcement framework on a bottom die template, binding the web steel reinforcement framework on the bottom die steel reinforcement framework, and installing the web inner template and the web outer template on two sides of the web steel reinforcement framework. And the two sides of the third embedded part are provided with pre-stress pull rod reserved pore canals, and pre-stress steel strands are arranged in the pre-stress pull rod reserved pore canals.
And S8, performing concrete pouring, namely performing first concrete pouring on pouring areas formed by the bottom die steel reinforcement framework, the web inner templates and the web outer templates, and tensioning the prestressed steel strands for the first time after the concrete is cured. Then installing a lower beam top plate bracket and a top die template, binding a top plate steel reinforcement framework, and then performing secondary concrete pouring on the top plate steel reinforcement framework;
s9, dismantling the beam support, namely dismantling the beam support after construction is completed, dismantling the beam support after sand is discharged by utilizing a sandbox, and tensioning the prestressed steel strand for the second time.
In summary, the present application includes at least one of the following beneficial technical effects:
1. The steel pipe column is arranged at the top of the tower pier, so that the steel consumption of a beam bracket in the related art is effectively reduced, the bracket is arranged at one end, far away from the tower pier, of the steel pipe column, the second embedded part and the third embedded part are embedded between the two lower tower columns, the bracket is firmly arranged between the two lower tower columns, and the lifting workload and the mounting difficulty of supporting by adopting steel brackets and steel arches are effectively reduced;
2. Through set up bracket connection system between adjacent bracket for interconnect is fixed between the bracket of adjacency, has strengthened bracket's support strength to the bailey roof beam effectively.
Drawings
Fig. 1 is a schematic overall structure of an embodiment of the present application.
Fig. 2 is an enlarged view of a portion a in fig. 1.
Fig. 3 is an enlarged view of a portion B in fig. 1.
Fig. 4 is a cross-sectional view taken along A-A in fig. 1.
Fig. 5 is a schematic structural diagram for embodying the relationship between the tripod and the bailey beam in the embodiment of the present application.
Fig. 6 is an enlarged view of a portion C in fig. 5.
Fig. 7 is a sectional view taken along the direction B-B in fig. 1.
Reference numerals illustrate:
10. The steel pipe pile comprises a beam bracket, 11, a first distribution beam, 12, a sandbox, 13, a third distribution beam, 20, a steel pipe column, 21, a steel pipe column, 22, a connecting rod, 23, an inclined strut, 24, a pile cap, 30, a bracket, 31, a semi-bracket, 32, a connecting plate, 33, a horizontal rod, 34, a bracket, 35, a second embedded part, 36, screw steel, 37, a third embedded part, 40, a first embedded part, 41, a hooking reinforcing steel bar, 42, a fixing plate, 43, a supporting plate, 50, a prestress pull rod reserved hole, 51, a prestress pull rod, 60, a bracket connecting system, 61, a longitudinal rod, 62, an inclined rod, 70, a lateral limit steel plate, 71, a steel wedge block, 72, a second distribution beam, 80, a triangular bracket, 81, a supporting rod, 82, a bell-shaped beam, 83, a tightening part, 84, a fourth distribution beam, 90, a tower pier, 91 and a lower tower column.
Detailed Description
The present application is described in further detail below with reference to FIGS. 1-7.
Embodiment one:
Referring to fig. 1, the template system of the lower cross beam of the ultra-high diamond tower pier disclosed by the application comprises a cross beam bracket 10 arranged at the top of a tower pier 90, wherein the cross beam bracket 10 is arranged along the height direction of a cable tower, and the cross beam bracket 10 is positioned between two lower tower columns 91. In this embodiment, the beam support 10 serves as the primary load-bearing structure for the lower beam construction.
Referring to fig. 1 and 2, specifically, the beam bracket 10 includes two sets of steel pipe columns 20 vertically installed at the top of the tower pier 90 and four sets of bracket brackets 30 installed at one ends of the steel pipe columns 20 away from the tower pier 90, the bracket brackets 30 are arranged in a substantially "pi" shape in longitudinal section, the bracket brackets 30 of the four sets are arranged at equal intervals along the width direction of the lower tower column 91, and both ends of the bracket brackets 30 are respectively installed at one sides of the two lower tower columns 91 facing each other. Two sets of steel pipe stand 20 are set up along the length direction of tower mound 90 relatively, and the quantity of every steel pipe stand 20 of group is three, and three steel pipe stand 20 are equidistant along the width direction of tower mound 90 to be set up. Specifically, the steel pipe column 20 is composed of a plurality of steel pipe columns 21 spliced with each other, and the upper steel pipe column 21 and the lower steel pipe column 21 are connected by flanges. The first embedded parts 40 are embedded in the tower piers 90, the first embedded parts 40 are arranged along the height direction of the tower piers 90, and the number of the first embedded parts 40 is the same as that of the steel pipe columns 20. Specifically, the first embedded part 40 includes a plurality of hooking bars 41 pre-buried in the tower pier 90 and a fixing plate 42 arranged at the top of the tower pier 90, one side of the fixing plate 42 facing the hooking bars 41 is abutted to the top surface of the tower pier 90, a plurality of hooking bars 41 are uniformly distributed on one side of the fixing plate 42 abutted to the top surface of the tower pier 90, the top ends of the hooking bars 41 are fixedly welded on one side of the fixing plate 42 facing the tower pier 90, and the hooking bars 41 are in an L-shaped arrangement.
Referring to fig. 1 and 2, in the present embodiment, the fixing plate 42 is made of a steel plate, and the cross section of the fixing plate 42 is circular. A plurality of backup pads 43 are installed to one side that fixed plate 42 deviates from tower mound 90, backup pad 43 is made for the steel sheet material, backup pad 43 is right trapezoid shape setting, backup pad 43 is used for making between steel-pipe column 21 and the tower mound 90 fixed each other, and a plurality of backup pads 43 along the circumference direction evenly distributed of fixed plate 42 for the bottom of steel-pipe column 20 can be held just to the cavity that forms between a plurality of backup pads 43, after the bottom of steel-pipe column 20 inserts the cavity, welds between backup pad 43 and the steel-pipe column 21 again and makes the two fixed each other. By installing the steel pipe column 20 at the top of the tower pier 90, less steel pipe material is required than when a floor steel bracket is used, and excessive bracket wall-attaching buries are not required, so that the steel consumption is effectively reduced.
Referring to fig. 1 and 2, a plurality of groups of connection assemblies are provided between two adjacent steel pipe columns 20, the plurality of groups of connection assemblies are arranged at equal intervals along the length direction of the steel pipe columns 20, and the connection assemblies are used for connecting and fixing the two adjacent steel pipe columns 20. Specifically, the connecting assembly comprises two connecting rods 22, the two connecting rods 22 are oppositely arranged along the length direction of the steel pipe column 21, the connecting rods 22 are made of 20b I-steel, and two ends of the connecting rods 22 are welded to the two adjacent steel pipe columns 21 respectively. Two diagonal braces 23 which are arranged in a crossing way are further arranged between the upper steel pipe column 21 and the lower steel pipe column 21, the two diagonal braces 23 are mutually fixed through welding at the crossing points of the two diagonal braces 23, and two ends of the diagonal braces 23 are respectively welded at one ends of connecting rods 22 of the upper steel pipe column 21 and the lower steel pipe column 21.
Referring to fig. 1 and 3, the pile caps 24 are installed at the top ends of the steel pipe columns 20, the pile caps 24 are used for blocking the openings of the steel pipe columns 20, a first distribution beam 11 is welded to one side of the pile caps 24 facing away from the steel pipe columns 21, the first distribution beam 11 is arranged along the width direction of the lower tower column 91, the first distribution beam 11 is located between the steel pipe columns 20 and the bracket brackets 30, the number of the first distribution beams 11 is the same as the number of the groups of the steel pipe columns 20, and the junctions of the first distribution beams 11 and the pile caps 24 at the top ends of each group of the steel pipe columns 20 are mutually fixed through welding. The first distribution beam 11 includes three H-section steels welded to each other, the three H-section steels are arranged side by side along the length direction of the tower pier 90, the upper surfaces of the three H-section steels are fixed to each other by means of toe welding, and the lower surfaces of the three H-section steels are also fixed to each other by means of toe welding.
Referring to fig. 1 and 3, the bracket 30 includes two half brackets 31 that are spliced with each other, the two half brackets 31 are mirror images, and one ends of the two half brackets 31 facing each other are abutted. Four connecting plates 32 are welded at the joint of the two half brackets 31, the connecting plates 32 are made of square steel plates, the connecting plates 32 are arranged along the length direction of the half brackets 31, and the four connecting plates 32 are arranged along the circumferential direction of the half brackets 31, so that the two half brackets 31 are mutually fixed.
Referring to fig. 3 and 4, specifically, the half-bracket 31 includes a horizontal bar 33 and brackets 34 welded to one side of the horizontal bar 33 facing the tower 90, the horizontal bar 33 is disposed along the length direction of the lower tower 91, four connecting plates 32 are respectively welded to four sides of the junction of the two horizontal bars 33, and the brackets 34 are disposed obliquely from one end close to the lower tower 91 to one end far from the lower tower 91. In this embodiment, the horizontal bar 33 is formed by two parallel-arranged 56b i-beams, the two i-beams are arranged in parallel along the width direction of the lower tower column 91, the upper surfaces of the two i-beams are welded with connecting steel plates, the connecting steel plates are arranged in a cuboid shape, and the connecting steel plates are arranged along the length direction of the horizontal bar 33. The upper surfaces of the two I-beams and the connecting steel plate are mutually fixed through welding, and the lower surfaces of the two I-beams are welded on one side of the first distribution beam 11, which faces away from the steel pipe column 21. The side wall of the lower tower column 91 is embedded with a second embedded part 35, one end of the second embedded part 35 is embedded in the lower tower column 91, and one end of the second embedded part 35, which is far away from the lower tower column 91, is fixedly welded on one side of the horizontal rod 33, which faces the tower pier 90.
Referring to fig. 4 and 5, in this embodiment, the second embedded part 35 includes three pieces of i-steel 63b welded to each other, the three pieces of i-steel are disposed in parallel along the width direction of the lower tower 91, and flanges between two adjacent pieces of i-steel abut against each other. The upper and lower surfaces of the three I-steel plates are welded with fixed steel plates, the length of each fixed steel plate is the same as that of each I-steel plate, and the width of each fixed steel plate is the sum of the widths of the three I-steel plates. Referring to fig. 6, a plurality of deformed steel bars 36 are installed between two fixed steel plates in a penetrating manner, the plurality of deformed steel bars 36 are arranged at equal intervals along the length direction of the fixed steel plates, and two ends of the deformed steel bars 36 penetrate out of the two fixed steel plates respectively, so that connection and fixation between the second embedded part 35 and the lower tower column 91 are enhanced.
Referring to fig. 5 and 6, specifically, the bracket 34 includes two pieces of i-steel 56b welded to each other, the two pieces of i-steel being juxtaposed in the width direction of the lower tower 91. Referring to fig. 4, the third embedded part 37 is further installed on the side wall of the lower tower column 91, the third embedded part 37 is installed below the second embedded part 35, one end of the third embedded part 37 is embedded in the lower tower column 91, the other end of the third embedded part extends out of the lower tower column 91, one end of the third embedded part 37 extending out of the lower tower column 91 is fixedly connected with one end, away from the horizontal rod 33, of the bracket 34, and one end, away from the third embedded part 37, of the bracket 34 is fixedly welded to one side, facing the third embedded part 37, of the horizontal rod 33. In this embodiment, the structure of the third embedded part 37 is the same as that of the second embedded part 35, and will not be described in detail here.
Referring to fig. 4 and 5, in addition, the third embedded part 37 is provided with a pre-stress pull rod reserved hole 50 along two sides of the width direction of the lower tower column 91, the pre-stress pull rod reserved hole 50 is provided with a pre-stress pull rod 51 along the length direction of the lower tower column 91, and a plurality of pre-stress steel strands are pre-installed in the pre-stress pull rod 51. After pouring the lower tower column 91, the prestressed steel strands are stretched to enable the surrounding concrete materials to deform to a certain extent, so that the situation that the lower tower column 91 is stressed by load is solved, and the situation that the concrete is pulled to crack is reduced as much as possible.
Referring to fig. 5 and 7, a bracket connection system 60 is provided between two adjacent bracket brackets 30, and the bracket connection system 60 is used to connect and fix the two adjacent bracket brackets 30 to each other. Specifically, the bracket connection system 60 includes a plurality of parallel longitudinal bars 61 and diagonal bars 62 mounted between two adjacent longitudinal bars 61, each of the longitudinal bars 61 and the diagonal bars 62 is made of i-steel, and the plurality of longitudinal bars 61 are uniformly disposed along the length direction of the horizontal bar 33. Both ends of the vertical bars 61 are welded to the adjacent two horizontal bars 33, both ends of the diagonal bars 62 are welded to the adjacent two vertical bars 61, respectively, and the angle between the diagonal bars 62 and the vertical bars 61 is an acute angle. Referring to fig. 4, when the bracket 30 is installed, the plurality of horizontal rods 33 are fixedly connected with the second embedded part 35, and the bracket 34 is fixedly connected with the third embedded part 37, so that the horizontal rods 33 are supported, the supporting strength of the bottom die plate is ensured, and the lifting workload and the installation difficulty of supporting the steel bracket and the steel arch are effectively reduced.
Referring to fig. 5 and 6, two sets of lateral limit steel plates 70 are welded on one side of the horizontal rod 33 facing away from the second embedded part 35, the lateral limit steel plates 70 are mounted at one end of the horizontal rod 33, which is close to the lower tower column 91, the two sets of lateral limit steel plates 70 are arranged in parallel along the length direction of the horizontal rod 33, the number of the lateral limit steel plates 70 in each set is two, and the two lateral limit steel plates 70 in each set are oppositely arranged along the width direction of the horizontal rod 33. A steel wedge block 71 is arranged between the two lateral limiting steel plates 70 in each group, the steel wedge blocks 71 are arranged in a cuboid shape, and two ends of the steel wedge blocks 71 are welded to the two lateral limiting steel plates 70 respectively. A second distribution beam 72 is welded to the side of the steel wedge 71 facing away from the horizontal bar 33, the second distribution beam 72 being arranged along the length of the steel wedge 71, the second distribution beam 72 being located between two lateral limit steel plates 70. In this embodiment, the second distribution beam 72 includes four mutually welded 45b i-beams, the four i-beams are arranged in parallel along the width direction of the steel wedge block 71, the four i-beams are mutually fixed by welding, the sum of the widths of the four i-beams is equal to the width of the steel wedge block 71, and two ends of the i-beams are respectively welded to two lateral limit steel plates 70. Through the arrangement of the lateral limit steel plates 70, the steel wedge blocks 71 and the second distribution beams 72, the structural strength of the horizontal rods 33 is enhanced, and the supporting strength of the bracket 30 to the lower cross beam is further enhanced.
Referring to fig. 4 and 5, six sandboxes 12 are mounted on the side of the horizontal bar 33 facing away from the bracket 34, and the six sandboxes 12 are uniformly distributed along the length direction of the horizontal bar 33. The sandbox 12 is fixed to be provided with third distribution beam 13 on the side that deviates from horizontal pole 33, and third distribution beam 13 spanned four horizontal poles 33, and third distribution beam 13 includes three H shaped steel that are parallel to each other, and three H shaped steel is set up side by side along the length direction of horizontal pole 33, and the edge of a wing of three H shaped steel is fixed each other through the welding. In this embodiment, the sandbox 12 is disposed at the main supporting points of the horizontal rod 33 and the third distribution beam 13, and the sandbox 12 plays a role in supporting the third distribution beam 13 and facilitates the subsequent removal of the beam bracket 10.
Referring to fig. 5 and 6, a plurality of triangular brackets 80 are mounted on a side of the third distribution beam 13 facing away from the steel wedge 71, the triangular brackets 80 are used for supporting one end of the lower cross beam, which is close to the lower tower column 91, and the plurality of triangular brackets 80 are arranged at equal intervals along the length direction of the third distribution beam 13. The cross section of the tripod 80 is in a right triangle shape, and the hypotenuse of the tripod 80 is abutted against the side wall of the lower beam. The triangular bracket 80 is also internally provided with a supporting rod 81, one end of the supporting rod 81 is fixedly welded on the right-angle side of the triangular bracket 80, and the other end of the supporting rod is fixedly welded on the bevel side of the triangular bracket 80 so as to enhance the structural strength of the triangular bracket 80.
Referring to fig. 5 and 6, a bailey beam 82 is fixedly disposed on a side of the third distribution beam 13 facing away from the sandbox 12, the bailey beam 82 includes a plurality of bailey frames assembled with each other, the bailey frames are steel frames formed with certain units, and adjacent bailey frames are mutually fixed with bolts through windows. In addition, two abutting portions 83 are further disposed between the tripod 80 and the bailey beam 82, the abutting portions 83 are used for abutting the tripod 80 against the bailey beam 82, and the two abutting portions 83 are disposed opposite to each other along the height direction of the bailey beam 82. Referring to fig. 4, in the present embodiment, the abutting portion 83 is made of 20b i-steel, and the abutting portion is disposed along the width direction of the lower tower 91. When the bailey beam 82 is hoisted above the third distribution beam 13, the triangular brackets 80 on both sides of the bailey beam 82 play a limiting role on the bailey beam 82, and the situation that the bailey beam 82 is displaced when the bailey beam 82 is fixed is effectively reduced by the arrangement of the abutting part 83.
Referring to fig. 3 and 4, a plurality of fourth distribution beams 84 are welded to a side of the bailey beam 82 facing away from the third distribution beam 13, the plurality of fourth distribution beams 84 are disposed at equal intervals along the length direction of the horizontal bar 33, the fourth distribution beams 84 are made of 14b i-steel, and a side of the fourth distribution beams 84 facing away from the bailey beam 82 is fixedly connected with the bottom die template.
Referring to fig. 3 and 5, after the beam bracket 10 is fixedly installed, a bottom die plate is installed to the fourth distribution beam 84, the bottom die plate is positioned between the two lower tower columns 91, and after the bottom die plate is fixedly placed on the fourth distribution beam 84, the beam bracket 10 may be pre-pressed.
The bottom die steel bar framework is bound on the bottom die template, and the web steel bar framework is bound on the bottom die steel bar framework, so that a lower beam with a single box and three chambers is formed after pouring. The bottom die steel bar framework and the web steel bar framework are all in cuboid platy arrangement, are subjected to modularized construction, are prefabricated in a steel bar processing factory in advance, and are hoisted to a bottom die template on site. After the bottom die template, the bottom die steel reinforcement framework and the web steel reinforcement framework are installed and fixed, the inner and outer templates of the web are installed on two sides of the web steel reinforcement framework, and the lower beam can be subjected to first concrete pouring to the height of six meters. And after the concrete curing is completed, carrying out first tensioning on the prestressed steel strand, wherein the tensioning strength is 50%, then installing a top plate bracket and a top die template of the lower beam, binding a top plate reinforcement cage, and then carrying out second concrete pouring on the lower beam.
After the structural strength of the lower beam reaches the required strength, the beam bracket 10 can be removed, sand in the sand box 12 is discharged, and the third distribution beam 13 moves down by a certain height, so that the bottom die plate and the fourth distribution beam 84 are separated from each other, and the beam bracket 10 is removed.
The first embodiment of the application has the implementation principle that before the lower beam is constructed, the beam bracket 10 is required to be installed at the top of the tower pier 90, the first embedded part 40 is pre-embedded at the top of the tower pier 90, then the steel pipe columns 21 and the first embedded part 40 are mutually fixed, the plurality of steel pipe columns 21 are fixedly connected through flanges, and then the first distribution beam 11 is installed at the top end of the steel pipe column 20. By installing the steel pipe column 20 on top of the tower pier 90, less steel pipe material is required than when using a floor steel bracket, and no excessive bracket wall-attaching burial is required, effectively reducing the steel consumption for installing the cross beam bracket 10.
After the first distribution beam 11 is installed, the second embedded part 35 and the third embedded part 37 are installed on the side wall of the lower tower column 91, one end of the horizontal rod 33 is fixedly connected with the second embedded part 35, one end of the bracket 34, which is far away from the horizontal rod 33, is fixedly connected with the third embedded part 37, the sandbox 12 and the third distribution beam 13 are installed on the horizontal rod 33, the bailey beam 82 is hoisted to the third distribution beam 13 by using a tower crane, the fourth distribution beam 84 is erected on the bailey beam 82, and finally the bottom die template is installed on the fourth distribution beam 84. Through adopting many horizontal poles 33 and second built-in fitting 35 fixed connection, assisted by the setting of bracket 34 and third built-in fitting 37 to support horizontal pole 33, both guaranteed the support strength to die block template, effectively alleviateed again and taken hoist and mount work load and the installation degree of difficulty that steel bracket and steel bow member supported.
Embodiment two:
The application discloses a construction method of a lower cross beam of an ultra-high diamond tower pier, which comprises the following steps of,
S1, construction paying-off, namely performing construction paying-off on the top of a tower pier 90 of the diamond cable tower according to drawing illustration and construction requirements;
S2, mounting a steel pipe column 20 and a first embedded part 40, namely embedding the first embedded part 40 at the top of a tower pier 90, mounting the steel pipe column 20 on the first embedded part 40, mounting the steel pipe column 20 between two lower tower columns 91, wherein the steel pipe column 20 comprises a plurality of mutually spliced steel pipe columns 21, mutually fixing the two steel pipe columns 21 through flanges, and mounting a plurality of connecting rods 22 and diagonal bracing rods 23 between the two adjacent steel pipe columns 20;
S3, mounting a first distribution beam 11, namely arranging pile caps 24 at the top ends of the steel pipe upright posts 20, and fixing the joints of the first distribution beam 11 and the pile caps 24 of each group of steel pipe upright posts 20 by welding;
S4, mounting the bracket 30, the second embedded part 35 and the third embedded part 37, wherein the second embedded part 35 and the third embedded part 37 are embedded in the side wall of the lower tower column 91, and hoisting the half bracket 31 between the two lower tower columns 91, so that the horizontal rod 33 is fixedly connected with the second embedded part 35, and a second distribution beam 72 is arranged at one end of the horizontal rod 33, which is close to the lower tower column 91, so that the structural strength of the horizontal rod 33 is enhanced. One end of the bracket 34 far away from the horizontal rod 33 is fixedly connected with a third embedded part 37, and after the two half brackets 31 are fixed, a connecting plate 32 is welded at the joint of the two half brackets 31;
S5, installing the third distribution beam 13 and the bailey beam 82, namely installing a sand box 12 on a horizontal rod 33, erecting the third distribution beam 13 on the sand box 12, and placing the sand box 12 at the intersection of the horizontal rod 33 and the third distribution beam 13;
S6, mounting a fourth distribution beam 84 and a bottom die, namely longitudinally erecting the fourth distribution beam 84 on the Bailey beam 82 and mounting a bottom die template on the fourth distribution beam 84;
And S7, installing the bottom die steel reinforcement framework, the web steel reinforcement framework and the prestress steel strands, namely after the cross beam support 10 is pre-pressed, installing the bottom die steel reinforcement framework on a bottom die template, binding the web steel reinforcement framework on the bottom die steel reinforcement framework, and installing the web inner template and the web outer template on two sides of the web steel reinforcement framework. The two sides of the third embedded part 37 are provided with a prestress pull rod reserved pore canal 50, and prestress steel strands are arranged in the prestress pull rod reserved pore canal 50.
And S8, performing concrete pouring, namely performing first concrete pouring on pouring areas formed by the bottom die steel reinforcement framework, the web inner templates and the web outer templates, and tensioning the prestressed steel strands for the first time after the concrete is cured. Then installing a lower beam top plate bracket and a top die template, binding a top plate steel reinforcement framework, and then performing secondary concrete pouring on the top plate steel reinforcement framework;
s9, dismantling the beam support 10, namely dismantling the beam support 10 after construction is completed, dismantling the beam support after sand is discharged by utilizing the sand box 12, and tensioning the prestressed steel strand for the second time.
The above embodiments are not intended to limit the scope of the application, so that the equivalent changes of the structure, shape and principle of the application are covered by the scope of the application.
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| CN116732887A (en) * | 2023-06-16 | 2023-09-12 | 中铁广州工程局集团有限公司 | Bottom die bent construction method for super-high beam of super-large bridge main tower |
| CN117051720A (en) * | 2023-09-27 | 2023-11-14 | 中国山东国际经济技术合作有限公司 | Support system and method for cast-in-situ high pier column portal pier beam construction |
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| CN211815595U (en) * | 2019-04-03 | 2020-10-30 | 中交二公局第一工程有限公司 | Lower tower column tension and compression structure for cable tower |
| CN110965474A (en) * | 2019-11-28 | 2020-04-07 | 中铁广州工程局集团有限公司 | Construction method of cable tower cross beam |
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