CN115323917B - Construction method of bridge side span cast-in-situ section short cantilever bracket - Google Patents
Construction method of bridge side span cast-in-situ section short cantilever bracket Download PDFInfo
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- CN115323917B CN115323917B CN202210222356.4A CN202210222356A CN115323917B CN 115323917 B CN115323917 B CN 115323917B CN 202210222356 A CN202210222356 A CN 202210222356A CN 115323917 B CN115323917 B CN 115323917B
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- 238000010276 construction Methods 0.000 title claims abstract description 54
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 54
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 102
- 239000010959 steel Substances 0.000 claims abstract description 102
- 230000007704 transition Effects 0.000 claims abstract description 40
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 30
- 239000004576 sand Substances 0.000 claims abstract description 22
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 17
- 239000004575 stone Substances 0.000 claims description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 abstract description 8
- 238000009432 framing Methods 0.000 abstract description 7
- 230000000712 assembly Effects 0.000 abstract description 5
- 238000000429 assembly Methods 0.000 abstract description 5
- 238000009434 installation Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 238000005266 casting Methods 0.000 description 5
- 239000000725 suspension Substances 0.000 description 4
- 230000005484 gravity Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- Engineering & Computer Science (AREA)
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The application discloses a construction method of a bridge side span cast-in-situ section short cantilever bracket, which comprises the following steps of burying clamping assemblies on a transition pier, wherein each clamping assembly comprises a clamping joint and a lower clamping groove, the clamping joint is arranged on a horizontal section of the transition pier, and the lower clamping groove is arranged on a vertical section of the transition pier; the fixed end of the square timber is arranged on the horizontal section of the transition pier; one end of the diagonal brace is inserted into the lower clamping groove, and the other end of the diagonal brace is inserted into the upper clamping groove of the cantilever end of the square timber; placing a fine sand cushion layer on the square timber; placing a bottom steel plate on the fine sand cushion layer, wherein a plurality of reinforcing ribs are fixed on the bottom steel plate at intervals, and holes are formed in rib plates of the reinforcing ribs; installing other templates, and penetrating the lowest reinforcing steel bar through the holes of the reinforcing ribs when binding the reinforcing steel bars; and installing a prestressed pipeline, and pouring concrete. The application solves the problems of relatively high erection cost and low construction efficiency caused by the prior construction of a bridge side span cast-in-situ section by firstly erecting a full framing or a triangular bracket.
Description
Technical Field
The application belongs to the technical field of bridges, and particularly relates to a bridge side span cast-in-situ section short cantilever bracket construction method.
Background
With the continuous development of bridge construction technology, large-span continuous bridges are widely used, and the large-span continuous bridges comprise continuous rigid frame bridges and continuous beam bridges constructed by a suspension casting method. The girder body of the large-span continuous bridge is divided according to construction parts and comprises a pier top cast-in-place section, a suspension casting section, a side span cast-in-place section and a folding section. The construction sequence is as follows: firstly, constructing a pier top cast-in-situ section, then installing hanging baskets on the pier top cast-in-situ section, constructing a hanging casting section by symmetrical cantilevers, and before the construction of the suspension casting section is completed, the construction of the side span suspension casting section is completed, and finally the closure section is constructed. The side span cast-in-situ section is a part of the beam body structure and is positioned at two ends of the continuous beam. One end of the side span cast-in-situ section is lapped on the side pier, and the other end is suspended. When in construction, a bracket is required to be erected, the beam body is constructed on the bracket, and after the folding section is constructed, each section Liang Tixing is integrated, and the bracket can be detached. The reasonable length of the side span of the continuous beam is generally 0.60 to 0.65 times the length of the middle span. Because the length of the side span cast-in-situ section is often reduced due to the limitation of the terrain condition, the construction is convenient, and the length of the side span is required to be reduced. The currently known side span cast-in-situ section construction method is various, and most of the side span cast-in-situ section construction methods adopt a full framing or triangular bracket for construction, wherein in the construction process, the full framing or triangular bracket is firstly erected, and then the working procedures of pier top installation templates, steel bar binding, prestressed pipeline installation, concrete pouring and the like are carried out. The existing construction method has the defects of relatively high erection cost, long working time and difficult disassembly of the bracket or the bracket, thereby reducing the construction efficiency of the bridge side span cast-in-situ section and influencing the construction period of the whole bridge.
Disclosure of Invention
The embodiment of the application solves the problems that in the prior art, a full framing or a triangular bracket is required to be firstly erected in bridge side span cast-in-situ section construction, the erection cost is relatively high and the construction efficiency is low by providing the bridge side span cast-in-situ section short cantilever bracket construction method. According to the application, square timber is supported by the clamping assembly and the diagonal bracing to form the short cantilever bracket, and the short cantilever bracket is a support structure of the bridge side span cast-in-situ section.
In order to achieve the above purpose, the embodiment of the invention provides a bridge side span cast-in-situ section short cantilever bracket construction method, which comprises the following steps:
during construction of the transition pier, clamping assemblies are buried in the transition pier, the clamping assemblies are multiple in number and are arranged at intervals along the vertical direction of the bridge, each clamping assembly comprises multiple clamping joints and multiple lower clamping grooves, and the clamping joints and the lower clamping grooves of each clamping assembly are located in the same plane; the clamping connector is arranged on the horizontal section of the transition pier, and the lower clamping groove is arranged on the vertical section of the transition pier;
Placing the fixed end of square timber on the horizontal section of the transition pier, enabling the clamping plate on the fixed end of the square timber and the clamping connector to be arranged oppositely, pushing the square timber, clamping the clamping connector in the groove body of the clamping plate, and further horizontally installing the fixed end of the square timber on the horizontal section of the transition pier;
Inserting one end of the diagonal brace into the lower clamping groove, inserting the other end of the diagonal brace into an upper clamping groove on the lower surface of the cantilever end of the square timber, and enabling rib plates on the side wall of the diagonal brace to be respectively abutted with the lower clamping groove and the upper clamping groove;
Placing a fine sand cushion layer on the square timber, wherein a detachable template is arranged on the periphery of the fine sand cushion layer, and the fine sand cushion layer is equal to a support cushion stone on the transition pier in height;
Placing a bottom steel plate on the fine sand cushion layer, wherein the bottom steel plate is a bottom die of a bridge side span cast-in-situ section, a plurality of reinforcing ribs are fixed on the bottom steel plate at intervals, the reinforcing ribs are arranged in parallel with the extending direction of the bridge, and a plurality of holes are formed in rib plates of the reinforcing ribs;
Installing other templates, binding steel bars, and penetrating the lowest steel bar through the holes of the reinforcing ribs when binding the steel bars so as to connect the steel bars with the reinforcing ribs;
and installing a prestressed pipeline, and then pouring concrete.
In a possible implementation manner, when the transition pier is constructed, a lower bolt seat is buried in the transition pier, an upper bolt seat is fixed on the lower surface of the bottom steel plate, and the lower bolt seat and the upper bolt seat have the same structure;
after the bottom steel plate is placed, the upper end of the plug block is inserted into the through groove of the upper plug pin seat, and the upper end of the plug block is connected with the upper plug pin seat by utilizing a plug pin; and simultaneously, the lower end of the plug block is inserted into the through groove of the lower plug pin seat, and the lower end of the plug block is connected with the lower plug pin seat by utilizing a plug pin.
In one possible implementation, the lower latch seats are disposed on either side of the snap-in assembly.
In one possible implementation manner, each clamping assembly includes two lower clamping grooves, and two diagonal braces corresponding to the two lower clamping grooves are respectively connected to the end part and the middle part of the cantilever end of the square timber.
In one possible implementation manner, when two diagonal braces are inserted into the corresponding lower clamping grooves, the inserting directions of the two diagonal braces are opposite.
In one possible implementation manner, after one end of the diagonal brace is inserted into the lower clamping groove, the lower end of the locking pin penetrates through the diagonal brace and then stretches into the hole in the side wall of the lower clamping groove, and the locking pin is vertically arranged.
In one possible implementation manner, when the bent cap is constructed, a plurality of fixing rings are pre-buried on the vertical section of the bent cap, and the bridge side span cast-in-situ section is positioned at one side of the vertical section of the bent cap;
And after the bottom steel plate is placed, a plurality of fixing rings and a plurality of ring bodies on the upper end surfaces of the reinforcing ribs are respectively connected by utilizing steel strands.
In one possible implementation manner, a basket bolt is arranged at one end, close to the bent cap, of the steel strand, and the steel strand is tensioned through the basket bolt, so that the bottom steel plate is kept in a horizontal state.
One or more technical solutions provided in the embodiments of the present invention at least have the following technical effects or advantages:
The embodiment of the invention provides a construction method of a bridge side span cast-in-situ section short cantilever bracket. The diagonal bracing and the square timber form a short cantilever bracket, the short cantilever bracket is a supporting structure of a bridge side span cast-in-situ section, and the diagonal bracing is installed in a detachable connection mode. After the template around the fine sand cushion is disassembled, the fine sand cushion can be disassembled, so that the bridge side span cast-in-situ section is supported on the transition pier through the support cushion stones. The bottom steel plate is directly used as a bottom die of a bridge side span cast-in-situ section and forms a construction template with other templates, and the bottom steel plate is not required to be removed after concrete is poured, so that the procedure of removing the bottom die is omitted. The bottom steel plate is used as a permanent structure of the bridge side span cast-in-situ section, and can improve the strength of the bridge side span cast-in-situ section, further improve the mechanical property of the bridge side span cast-in-situ section, prevent the problem that the bridge side span cast-in-situ section is cracked due to fatigue, simplify the construction procedure and shorten the construction period. The reinforcing rib can improve the integral bending resistance of the bottom steel plate, can combine the bottom steel plate with concrete more tightly, passes the reinforcing steel bar through the holes of the reinforcing rib, and can further improve the combined tightness of the bottom steel plate and the concrete after the reinforcing steel bar is connected with the reinforcing rib, so that the strength of the bridge side span cast-in-situ section is ensured. According to the invention, square timber is supported by the clamping assembly and the diagonal bracing to form the short cantilever bracket, and the short cantilever bracket is a support structure of the bridge side span cast-in-situ section, so that the problems of relatively high erection cost and low construction efficiency caused by the fact that a full framing bracket or a triangular bracket is firstly erected during bridge side span cast-in-situ section construction in the prior art are avoided.
The transition pier and the bottom steel plate are connected through the block body, the lower bolt seat and the upper bolt seat, so that the stability of the bottom steel plate can be further improved, and the problem that the bridge side span cast-in-place section is unstable due to overlarge stress at the end part of the bottom steel plate after concrete pouring is prevented. The steel strands corresponding to the fixing rings are arranged in parallel, and the steel strands can conduct partial gravity of the steel plate and concrete poured on the steel plate at the last stage to the bent cap, so that the supporting force of square timber and inclined struts is reduced, and the overall stability of the steel strands after construction by the method is further improved. The length of the steel strand can be changed by arranging the stud, so that the bottom steel plate can be conveniently adjusted, and the bottom steel plate can be kept in a horizontal state.
The locking pin can prevent the inclined strut and the lower clamping groove from slipping, and the inclined strut and the upper clamping groove can be provided with the locking pin. The anti-loose pin is vertically arranged, the diagonal bracing is horizontally arranged, and the anti-loose pin and the diagonal bracing are perpendicular in installation direction, so that the problem of looseness of the diagonal bracing caused by later construction of a bridge side span cast-in-situ section can be well prevented.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
Fig. 1 is a schematic structural view of a transition pier and a capping beam according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a square timber after installation according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a connection structure of a square timber and a clamping connector according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of an assembled diagonal brace according to an embodiment of the present invention.
Fig. 5 is a schematic structural view of a diagonal brace according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a diagonal brace according to an embodiment of the present invention.
Fig. 7 is a schematic view of the structure of the fine sand mat after installation according to the embodiment of the present invention.
Fig. 8 is a schematic structural view of a bottom steel plate according to an embodiment of the present invention after being installed.
Fig. 9 is a schematic diagram of a connection structure of a lower latch seat and an upper latch seat according to an embodiment of the present invention.
Fig. 10 is a schematic structural diagram of a steel strand after installation according to an embodiment of the present invention.
Reference numerals: 1-transition piers; 2-clamping assembly; 21-a bayonet joint; 22-a lower clamping groove; 3-square timber; 31-a fixed end; 32-upper clamping grooves; 33-cantilever end; 34-a clamping plate; 4-diagonal bracing; 5-a fine sand cushion layer; 6-supporting a backing stone; 7-bottom steel plate; 8-reinforcing ribs; 81-opening holes; 9-lower latch seats; 10-upper latch seats; 11-inserting blocks; 12-locking pin; 13-a capping beam; 14-a fixed ring; 15-steel strand wires; 16-ring body; 17-basket bolts.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the embodiments of the present invention and simplify description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. The terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the embodiments of the present invention will be understood by those of ordinary skill in the art according to specific circumstances.
As shown in fig. 1 to 10, the construction method of the bridge side span cast-in-situ section short cantilever bracket provided by the embodiment of the invention comprises the following steps:
As shown in fig. 1, when the transition pier 1 is constructed, the plurality of clamping assemblies 2 are buried in the transition pier 1, the plurality of clamping assemblies 2 are arranged at intervals along the vertical direction of the bridge, each clamping assembly 2 comprises a plurality of clamping joints 21 and a plurality of lower clamping grooves 22, and the clamping joints 21 and the lower clamping grooves 22 of each clamping assembly 2 are all positioned in the same plane. The clamping connector 21 is arranged on the horizontal section of the transition pier 1, and the lower clamping groove 22 is arranged on the vertical section of the transition pier 1.
As shown in fig. 2 and 3, the fixed end 31 of the square timber 3 is placed on the horizontal section of the transition pier 1, so that the clamping plate 34 and the clamping head 21 on the fixed end 31 of the square timber 3 are arranged oppositely, then the square timber 3 is pushed, the clamping head 21 is clamped in the groove of the clamping plate 34, and then the fixed end 31 of the square timber 3 is horizontally installed on the horizontal section of the transition pier 1.
As shown in fig. 4, one end of the diagonal brace 4 is inserted into the lower locking groove 22, and at the same time, the other end of the diagonal brace 4 is inserted into the upper locking groove 32 on the lower surface of the cantilever end 33 of the square lumber 3, and the rib on the side wall of the diagonal brace 4 is brought into contact with the lower locking groove 22 and the upper locking groove 32, respectively.
As shown in fig. 7, a fine sand cushion 5 is placed on the square lumber 3, a detachable template is arranged on the periphery of the fine sand cushion 5, and the fine sand cushion 5 is equal to the support cushion 6 on the transition pier 1 in height.
As shown in fig. 8, a bottom steel plate 7 is placed on the fine sand cushion 5, the bottom steel plate 7 is a bottom die of a bridge side span cast-in-situ section, a plurality of reinforcing ribs 8 are fixed on the bottom steel plate 7 at intervals, the reinforcing ribs 8 are arranged in parallel with the extending direction of the bridge, and a plurality of holes 81 are formed in rib plates of the reinforcing ribs 8.
And installing the rest templates, binding the steel bars, and penetrating the steel bars at the lowest part through the holes 81 of the reinforcing ribs 8 when binding the steel bars, so that the steel bars are connected with the reinforcing ribs 8.
And installing a prestressed pipeline, and then pouring concrete.
It should be noted that, the clamping connector 21 and the lower clamping groove 22 are embedded parts, the clamping connector 21 comprises a column body and a plate body arranged at the upper end of the column body, the lower end of the column body is fixedly mounted through embedded bars, and the clamping plate 34 is provided with a groove body parallel to the length direction of the clamping plate. When the clamping connector 21 is clamped in the groove of the clamping plate 34, the column body is positioned in the groove of the clamping plate 34, and the plate body is positioned on the upper part of the clamping plate 34, so that the fixed end 31 of the square timber 3 is temporarily fixed. In this embodiment, there are three clamping connectors 21 of each clamping assembly 2. When the clamping connector 21 and the support cushion 6 are in mounting conflict, the clamping connector 21 is arranged close to the vertical section of the transition pier 1, and meanwhile, the distance between two adjacent clamping connectors 21 is shortened. The material of the clip 21 and the clip 34 is steel. The upper end faces of the two side walls of the groove body of the clamping plate 34 can be obliquely arranged, so that the fixed end 31 of the square timber 3 is conveniently and firmly fixed, and shaking of the square timber is prevented. The square timber 3 is convenient to assemble and disassemble in a fixed mode, so that the square timber 3 can be repeatedly used.
The clamping connector 21 and the lower clamping groove 22 of each clamping assembly 2 are positioned in the same plane, so that the square timber 3 can be further supported by using the diagonal bracing 4, and further a short cantilever bracket is formed, and the short cantilever bracket is a support structure of a bridge side span cast-in-situ section.
The lower clamping groove 22 and the upper clamping groove 32 have the same structure, and after the diagonal brace 4 is inserted and installed, the diagonal brace 4 supports and fixes the cantilever end 33 of the square timber 3. The rib plates on the side wall of the diagonal brace 4 can play a role in strengthening, and when the rib plates on the side wall of the diagonal brace 4 are respectively abutted with the lower clamping groove 22 and the upper clamping groove 32, namely the diagonal brace 4 is inserted in place. The installation mode of bracing 4 is the detachable connection equally, and this installation mode is swift, intensity is high simultaneously, can satisfy the support demand of square timber 3.
The fine sand cushion 5 is lapped on at least two square lumber 3, so that the stability of the fine sand cushion is ensured, and after the template around the fine sand cushion 5 is disassembled, the fine sand cushion 5 can be dismantled, so that the bridge side span cast-in-situ section is supported on the transition pier 1 through the support cushion 6.
The bottom steel plate 7 is directly used as a bottom die of a bridge side span cast-in-situ section and forms a construction template with other templates, the bottom steel plate 7 is not required to be removed after concrete is poured, and the procedure of removing the bottom die is omitted. The bottom steel plate 7 is used as a permanent structure of the bridge side span cast-in-situ section, the bottom steel plate 7 can improve the strength of the bridge side span cast-in-situ section, further improve the mechanical property of the bridge side span cast-in-situ section, prevent the problem that cracks appear in the bridge side span cast-in-situ section due to fatigue, simplify the construction procedure and shorten the construction period due to the arrangement of the bottom steel plate 7.
The reinforcing rib 8 can improve the integral bending resistance of the bottom steel plate 7, can combine the bottom steel plate 7 with concrete more tightly, passes the reinforcing steel bar through the opening 81 of the reinforcing rib 8, and can further improve the compactness of the combination of the bottom steel plate 7 and the concrete after the reinforcing steel bar is connected with the reinforcing rib 8, thereby ensuring the strength of the bridge side span cast-in-situ section.
The pouring of installing other templates, binding reinforcing steel bars, installing prestressed pipelines and concrete is the same as the prior art, so that the description is omitted here.
According to the invention, the square timber 3 is supported by the clamping assembly 2 and the diagonal bracing 4to form the short cantilever bracket, and the short cantilever bracket is a support structure of the bridge side span cast-in-situ section, so that the problems that the erection cost is relatively high and the construction efficiency is low due to the fact that a full framing or a triangular bracket is required to be erected firstly in the construction of the bridge side span cast-in-situ section in the prior art are avoided.
As shown in fig. 9, in the present embodiment, when the transition pier 1 is constructed, the lower latch seats 9 are buried in the transition pier 1, and the upper latch seats 10 are fixed to the lower surface of the bottom steel plate 7, and the lower latch seats 9 and the upper latch seats 10 have the same structure.
After the bottom steel plate 7 is placed, the upper end of the plug 11 is inserted into the through groove of the upper plug seat 10, and the upper end of the plug 11 is connected with the upper plug seat 10 by a plug. Simultaneously, the lower end of the plug 11 is inserted into the through groove of the lower plug seat 9, and the lower end of the plug 11 is connected with the lower plug seat 9 by a plug.
It should be noted that, the end portions of the lower latch seat 9 and the upper latch seat 10 are respectively provided with a through groove, the through grooves of the lower latch seat 9 and the upper latch seat 10 are oppositely arranged, the lower latch seat 9 and the upper latch seat 10 are arranged at intervals, the upper end and the lower end of the latch block 11 are provided with blocks adapted to the through groove structure, and the blocks at the upper end and the lower end of the latch block 11 can be respectively inserted into the through grooves of the lower latch seat 9 and the upper latch seat 10 by transversely moving the latch block 11. The side walls of the block and the through groove are provided with bolt holes, and the block, the lower bolt seat 9 and the upper bolt seat 10 can be fixed after bolts pass through the bolt holes of the side walls of the block and the through groove. And the connection between the transition pier 1 and the bottom steel plate 7 can be disconnected after the bolts and the blocks are removed.
The transition pier 1 and the bottom steel plate 7 are connected through the block body, the lower bolt seat 9 and the upper bolt seat 10, so that the stability of the bottom steel plate 7 can be further improved, and the problem that the bridge side span cast-in-place section is unstable due to overlarge stress at the end part of the bottom steel plate 7 after concrete pouring is prevented.
In this embodiment, the lower latch seats 9 are disposed on two sides of the clamping assembly 2.
It should be noted that, the lower latch seats 9 are disposed on two sides of the clamping assembly 2, so as to facilitate the detachment of the latch and the block in the later stage.
As shown in fig. 4, in this embodiment, each clamping assembly 2 includes two lower clamping grooves 22, and two diagonal braces 4 corresponding to the two lower clamping grooves 22 are respectively connected to the end and middle of the cantilever end 33 of the square timber 3.
As shown, the upper ends of the two diagonal braces 4 support the end portions and the middle portion of the cantilever end 33 of the square lumber 3, respectively, and the two diagonal braces 4 have a length approximately twice as long, and the diagonal braces 4 transmit the force of the cantilever end 33 of the square lumber 3 to the transition pier 1.
As shown in fig. 4, in this embodiment, when two diagonal braces 4 are inserted into their corresponding lower clamping grooves 22, the directions in which the two diagonal braces 4 are inserted are opposite.
In the illustration, two diagonal braces 4 are inserted in opposite directions, and when the two diagonal braces 4 are inserted, construction can be performed simultaneously, namely, the diagonal braces 4 on two sides are inserted and installed simultaneously, so that the stress balance of the whole supporting structure is ensured.
In this embodiment, as shown in fig. 4, after one end of the diagonal brace 4 is inserted into the lower clamping groove 22, the lower end of the locking pin 12 passes through the diagonal brace 4 and then extends into the hole on the side wall of the lower clamping groove 22, and the locking pin 12 is vertically arranged.
The locking pin 12 may prevent the diagonal brace 4 and the lower engagement groove 22 from slipping off, and the diagonal brace 4 and the upper engagement groove 32 may be provided with the locking pin 12. The anti-loose pin 12 is vertically arranged, the diagonal bracing 4 is horizontally arranged, and the anti-loose pin 12 and the diagonal bracing 4 are perpendicular in installation direction, so that the problem that the diagonal bracing 4 is loosened when the bridge side span cast-in-situ section is constructed in the later period can be well prevented.
As shown in fig. 1, in this embodiment, when the capping beam 13 is constructed, a plurality of fixing rings 14 are pre-embedded on the vertical section of the capping beam 13, and the bridge side span cast-in-place section is located at one side of the vertical section of the capping beam 13.
As shown in fig. 10, after the bottom steel plate 7 is placed, the plurality of fixing rings 14 and the plurality of ring bodies 16 on the upper end surfaces of the reinforcing ribs 8 are connected to each other by steel strands 15.
It should be noted that, the steel strands 15 corresponding to the plurality of fixing rings 14 are arranged in parallel, and the steel strands 15 can conduct part of gravity of the steel plate and the concrete poured on the steel plate in the later stage to the bent cap 13, so that the supporting force of the square timber 3 and the diagonal bracing 4 is reduced, and the arrangement of the steel strands 15 further improves the overall stability after construction by adopting the method of the invention.
As shown in fig. 10, in this embodiment, a basket bolt 17 is provided at one end of the steel strand 15 near the bent cap 13, and the steel strand 15 is pulled by the basket bolt 17, so that the bottom steel plate 7 is kept in a horizontal state.
The length of the stranded wire 15 can be changed by providing the stud bolts 17, so that the bottom steel plate 7 can be easily adjusted to be kept in a horizontal state. The steel strand 15 is arranged near one end of the bent cap 13, and when the joint of the steel strand 15 and the bent cap 13 is removed in the later stage, the steel strand 15 and the bridge side span cast-in-place section can be disconnected, and the removed basket bolts 17 can be reused. The steel strands 15 left in the concrete can be connected with the steel bars, so that the overall stability of the bridge side span cast-in-place section is improved.
When the construction method of the bridge side span cast-in-place section short cantilever bracket is adopted, the square timber 3 is supported by the clamping assembly 2 and the diagonal bracing 4 to form the short cantilever bracket, the short cantilever bracket is a support structure of the bridge side span cast-in-place section, further, the problems that a full framing or a triangular bracket is required to be erected firstly in the construction of the bridge side span cast-in-place section in the prior art, the erection cost is relatively high and the construction efficiency is low are avoided, the bottom steel plate 7 is directly used as a bottom die of the bridge side span cast-in-place section, the bottom steel plate 7 is not required to be dismantled after concrete is poured, the bottom steel plate 7 is used as a permanent structure of the bridge side span cast-in-place section, the mechanical property of the bridge side span cast-in-place section is improved, the reinforcing rib 8 can combine the bottom steel plate 7 with concrete more tightly, the reinforcing steel bar passes through the opening 81 of the reinforcing rib 8, the bonding property of the bottom steel plate 7 and the concrete can be further improved after the reinforcing rib 8 is connected, and the strength of the side span cast-in-place section is ensured. The steel strand 15 can conduct part of gravity of the steel plate and the concrete poured on the steel plate at the last stage to the bent cap 13, so that the supporting force of the square timber 3 and the diagonal bracing 4 is reduced, and the arrangement of the steel strand 15 further improves the overall stability after construction by adopting the method. The transition pier 1 and the bottom steel plate 7 are connected through the block body, the lower bolt seat 9 and the upper bolt seat 10, so that the stability of the bottom steel plate 7 can be further improved, the problem that the bridge side span cast-in-place section is unstable due to overlarge stress at the end part of the bottom steel plate 7 after concrete pouring is prevented.
In the present embodiment, it will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, but that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (8)
1. The construction method of the bridge side span cast-in-situ section short cantilever bracket is characterized by comprising the following steps of:
During construction of the transition pier (1), clamping components (2) are buried on the transition pier (1), the clamping components (2) are multiple in number, the clamping components (2) are arranged at intervals along the vertical direction of the bridge, each clamping component (2) comprises a plurality of clamping joints (21) and a plurality of lower clamping grooves (22), and the clamping joints (21) and the lower clamping grooves (22) of each clamping component (2) are all located in the same plane; the clamping connector (21) is arranged on the horizontal section of the transition pier (1), and the lower clamping groove (22) is arranged on the vertical section of the transition pier (1);
Placing a fixed end (31) of a square timber (3) on the horizontal section of the transition pier (1), enabling a clamping plate (34) on the fixed end (31) of the square timber (3) and the clamping connector (21) to be arranged oppositely, pushing the square timber (3), clamping the clamping connector (21) into a groove body of the clamping plate (34), and further horizontally installing the fixed end (31) of the square timber (3) on the horizontal section of the transition pier (1);
Inserting one end of a diagonal brace (4) into the lower clamping groove (22), inserting the other end of the diagonal brace (4) into an upper clamping groove (32) on the lower surface of a cantilever end (33) of the square timber (3), and enabling rib plates on the side wall of the diagonal brace (4) to be respectively abutted with the lower clamping groove (22) and the upper clamping groove (32);
A fine sand cushion layer (5) is placed on the square timber (3), a detachable template is arranged on the periphery of the fine sand cushion layer (5), and the fine sand cushion layer (5) is equal to a support cushion stone (6) on the transition pier (1);
A bottom steel plate (7) is placed on the fine sand cushion layer (5), the bottom steel plate (7) is a bottom die of a bridge side span cast-in-situ section, a plurality of reinforcing ribs (8) are fixed on the bottom steel plate (7) at intervals, the reinforcing ribs (8) are arranged in parallel with the extending direction of the bridge, and a plurality of holes (81) are formed in rib plates of the reinforcing ribs (8);
Installing other templates, binding steel bars, and penetrating the lowest steel bar through the holes (81) of the reinforcing ribs (8) when binding the steel bars so as to connect the steel bars with the reinforcing ribs (8);
and installing a prestressed pipeline, and then pouring concrete.
2. The bridge side span cast-in-situ section short cantilever bracket construction method according to claim 1, wherein the method comprises the following steps: when the transition pier (1) is constructed, a lower bolt seat (9) is buried in the transition pier (1), an upper bolt seat (10) is fixed on the lower surface of the bottom steel plate (7), and the lower bolt seat (9) and the upper bolt seat (10) have the same structure;
After the bottom steel plate (7) is placed, the upper end of the plug block (11) is inserted into the through groove of the upper plug pin seat (10), and the upper end of the plug block (11) is connected with the upper plug pin seat (10) by utilizing a plug pin; simultaneously, the lower end of the plug block (11) is inserted into the through groove of the lower plug pin seat (9), and the lower end of the plug block (11) is connected with the lower plug pin seat (9) by a plug pin.
3. The bridge side span cast-in-situ section short cantilever bracket construction method according to claim 2, wherein the method comprises the following steps: the lower latch seats (9) are arranged on two sides of the clamping assembly (2).
4. The bridge side span cast-in-situ section short cantilever bracket construction method according to claim 1, wherein the method comprises the following steps: each clamping assembly (2) comprises two lower clamping grooves (22), and two diagonal braces (4) corresponding to the two lower clamping grooves (22) are respectively connected to the end parts and the middle parts of cantilever ends (33) of the square timber (3).
5. The bridge side span cast-in-situ section short cantilever bracket construction method according to claim 1, wherein the method comprises the following steps: when the two diagonal braces (4) are inserted into the corresponding lower clamping grooves (22), the inserting directions of the two diagonal braces (4) are opposite.
6. The bridge side span cast-in-situ section short cantilever bracket construction method according to claim 1, wherein the method comprises the following steps: after one end of the diagonal brace (4) is inserted into the lower clamping groove (22), the lower end of the locking pin (12) penetrates through the diagonal brace (4) and then stretches into a hole in the side wall of the lower clamping groove (22), and the locking pin (12) is vertically arranged.
7. The bridge side span cast-in-situ section short cantilever bracket construction method according to claim 1, wherein the method comprises the following steps: when the bent cap (13) is constructed, a plurality of fixing rings (14) are pre-buried on the vertical section of the bent cap (13), and the bridge side span cast-in-situ section is positioned at one side of the vertical section of the bent cap (13);
After the bottom steel plate (7) is placed, a plurality of fixing rings (14) and a plurality of ring bodies (16) on the upper end surfaces of the reinforcing ribs (8) are respectively connected by utilizing steel strands (15).
8. The bridge side span cast-in-situ section short cantilever bracket construction method according to claim 7, wherein the method comprises the following steps: and a basket bolt (17) is arranged at one end, close to the bent cap (13), of the steel strand (15), the steel strand (15) is tensioned through the basket bolt (17), and the bottom steel plate (7) is kept in a horizontal state.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210222356.4A CN115323917B (en) | 2022-03-07 | 2022-03-07 | Construction method of bridge side span cast-in-situ section short cantilever bracket |
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| CN202210222356.4A CN115323917B (en) | 2022-03-07 | 2022-03-07 | Construction method of bridge side span cast-in-situ section short cantilever bracket |
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| CN115323917B true CN115323917B (en) | 2024-06-04 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103194982A (en) * | 2013-03-25 | 2013-07-10 | 中交路桥建设有限公司 | Construction method for short cantilever support at bridge side span cast-in-situ segment |
| CN103498425A (en) * | 2013-09-25 | 2014-01-08 | 中铁五局集团第一工程有限责任公司 | Full-dismounting combination type multifunctional bracket supporting structure and construction method thereof |
| CN213896816U (en) * | 2020-11-30 | 2021-08-06 | 四川路航建设工程有限责任公司 | Y-shaped support frame |
| CN214573397U (en) * | 2021-04-20 | 2021-11-02 | 中交隧道工程局有限公司 | Construction control support device for side-span cast-in-place section |
| CN215441502U (en) * | 2021-08-06 | 2022-01-07 | 武汉市市政路桥有限公司 | Bridge side-span cast-in-place section short cantilever construction device |
-
2022
- 2022-03-07 CN CN202210222356.4A patent/CN115323917B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103194982A (en) * | 2013-03-25 | 2013-07-10 | 中交路桥建设有限公司 | Construction method for short cantilever support at bridge side span cast-in-situ segment |
| CN103498425A (en) * | 2013-09-25 | 2014-01-08 | 中铁五局集团第一工程有限责任公司 | Full-dismounting combination type multifunctional bracket supporting structure and construction method thereof |
| CN213896816U (en) * | 2020-11-30 | 2021-08-06 | 四川路航建设工程有限责任公司 | Y-shaped support frame |
| CN214573397U (en) * | 2021-04-20 | 2021-11-02 | 中交隧道工程局有限公司 | Construction control support device for side-span cast-in-place section |
| CN215441502U (en) * | 2021-08-06 | 2022-01-07 | 武汉市市政路桥有限公司 | Bridge side-span cast-in-place section short cantilever construction device |
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| CN115323917A (en) | 2022-11-11 |
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