CN110747903A - Porous frame bridge and assembling construction method thereof - Google Patents
Porous frame bridge and assembling construction method thereof Download PDFInfo
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- CN110747903A CN110747903A CN201911031573.XA CN201911031573A CN110747903A CN 110747903 A CN110747903 A CN 110747903A CN 201911031573 A CN201911031573 A CN 201911031573A CN 110747903 A CN110747903 A CN 110747903A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
- E02D29/05—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/16—Arrangement or construction of joints in foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
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Abstract
The invention relates to the technical field of underground traffic engineering construction, and provides a porous frame bridge and an assembling construction method thereof, wherein block factory prefabrication is adopted, and the assembling construction is carried out synchronously with foundation pit excavation, wherein firstly, the upper and lower sections of a single prefabricated section are assembled to form a closed prefabricated section, then, a plurality of closed prefabricated sections are longitudinally assembled in multiple directions to form a large-section frame bridge, and longitudinal prestress is tensioned; in the splicing and forming process of the whole large-section frame bridge, the processes of on-site formwork erection, reinforcement binding, concrete pouring and the like are not needed, the construction progress is greatly accelerated, the interference of construction vehicles and machines to surrounding traffic is reduced to the maximum extent, the dust and noise pollution to the surrounding area is reduced, and greater economic and social benefits are generated.
Description
Technical Field
The invention relates to the technical field of underground traffic engineering construction, in particular to a porous frame bridge and an assembling construction method thereof.
Background
At present, the urban shallow-buried integral type porous frame bridge generally adopts an open-cut cast-in-place construction method, and the open-cut method has the advantages of simple and rapid construction technology, economy and better stress condition of a main structure. But the interference to the surrounding environment and the urban life is large, the traffic blocking time is long, and the noise vibration is large. And the open cut cast-in-place method needs a large amount of on-site formwork erection, reinforcement binding and welding, concrete on-site pouring, a reinforcement processing field, long concrete curing time, difficult guarantee of on-site pouring quality, low efficiency, high labor intensity, long construction period and slow construction progress.
In order to overcome the limitation that the open cut method has great influence on the ground, a cover cut method is adopted in part of projects. The cover-excavation method is characterized in that after the ground is excavated downwards to a certain depth, the top of the ground is sealed, and other lower projects are constructed under the sealed top cover, so that the cover-excavation method has the advantages of small horizontal displacement of the structure, high safety coefficient, small influence on the ground, only short-time ground traffic sealing and locking, small influence of outside weather on construction and the like, but also has the defects of inconvenient unearthing, small construction space, slow construction progress, long construction period, high cost and the like.
Disclosure of Invention
Technical problem to be solved
The embodiment of the invention provides a porous frame bridge and an assembling construction method thereof, which aim to solve or partially solve the problems of large influence and low efficiency of the existing porous frame bridge construction.
(II) technical scheme
In order to solve the above technical problem, according to an aspect of an embodiment of the present invention, there is provided a method for assembling and constructing a porous frame bridge, including:
s1, paving a concrete cushion layer at the bottom of the pretreated frame section foundation pit and arranging a temporary support;
s2, hoisting a closed prefabricated section formed by assembling a prefabricated upper section and a prefabricated lower section onto the temporary support and positioning;
s3, sequentially completing longitudinal assembly and seam gluing of each closed prefabricated section to form a large-section frame bridge, and simultaneously tensioning temporary longitudinal prestress;
s4, after the whole large-section frame bridge is installed, applying permanent prestressed steel beams and removing temporary longitudinal prestress;
and S5, grouting the gap between the bottom plate of the large-section frame bridge and the concrete cushion, and removing the temporary supporting piece after the grouting layer reaches the preset strength.
Further, after the S5, the method further includes: and S6, pouring wet-cast section concrete at the end part of each large-section frame bridge and processing deformation joints.
Further, in the S1, the laying of the concrete pad and arranging the temporary support includes: pouring a C30 concrete foundation cushion layer with a first preset thickness at the bottom of the foundation pit of the frame section; pouring C20 prefabricated segment foundation mats with second preset thickness; and a reinforced concrete strip foundation for placing the temporary support is arranged at the lower part of the side wall.
Further, the assembling of the prefabricated upper section and the prefabricated lower section comprises: matching the prefabricated upper segment with the prefabricated lower segment; and gluing the joints of the prefabricated upper section and the prefabricated lower section, and welding the embedded steel plates at the joints to form the closed prefabricated sections.
Further, the S2 further includes:
when each closed prefabricated section is hoisted, unloading blocks are arranged on two sides of each closed prefabricated section.
Further, the S3 further includes:
positioning the closed prefabricated section of the first section, hoisting the closed prefabricated section of the next section to approach the closed prefabricated section of the first section, and trying to splice and align;
gluing the joint surface for construction, and tensioning temporary longitudinal prestress;
and sequentially assembling a plurality of closed prefabricated sections according to the steps to form the large-section frame bridge.
Further, the S4 further includes:
stretching the permanent prestressed steel strand by adopting stretching jacks which are distributed at two ends of the permanent prestressed steel strand and are symmetrical;
after all the closed prefabricated sections of the large-section frame bridge are assembled, permanent prestress tensioning can be carried out;
and unloading the longitudinal temporary prestress after the permanent prestress tension is finished.
Further, the S5 specifically includes: after the large-section frame bridge is assembled, filling gaps at the edges of the large-section frame bridge;
grouting cement slurry into a gap below a bottom plate of the large-section frame bridge until the cement slurry overflows from the peripheral slurry outlet holes;
filling cement slurry between the concrete cushion layer and the bottom plate of the large-section frame bridge by utilizing the self gravity of the large-section frame bridge, and supplementing pressure after a preset time interval;
and after the strength of the cement paste meets the design requirement, removing the temporary support piece at the bottom of the large-section frame bridge.
According to a second aspect of the embodiments of the present invention, a porous frame bridge is provided, which is implemented by the method for assembling and constructing a porous frame bridge according to the first aspect of the embodiments of the present invention, wherein the porous frame bridge includes at least one large-segment frame bridge, the large-segment frame bridge is uniformly arranged on a concrete cushion layer laid at the bottom of a frame segment foundation pit, and a grouting layer is filled between the bottom of the large-segment frame bridge and the concrete cushion layer;
the large-section frame bridge comprises a plurality of closed prefabricated sections which are sequentially spliced along the longitudinal direction, and each closed prefabricated section is formed by splicing a prefabricated upper section and a prefabricated lower section.
Furthermore, the large-section frame bridges are multiple and arranged at intervals, and connecting steel bars are reserved at the end parts of the adjacent large-section frame bridges and fixedly connected through concrete.
(III) advantageous effects
The porous frame bridge and the assembling construction method thereof provided by the embodiment of the invention adopt block factory prefabrication, are synchronously carried out with foundation pit excavation, firstly, the upper and lower sections of a single prefabricated section are assembled to form a closed prefabricated section, then, a plurality of closed prefabricated sections are longitudinally assembled in multiple directions to form a large-section frame bridge, and longitudinal prestress is tensioned; in the splicing and forming process of the whole large-section frame bridge, the processes of on-site formwork erection, reinforcement binding, concrete pouring and the like are not needed, the construction progress is greatly accelerated, the interference of construction vehicles and machines to surrounding traffic is reduced to the maximum extent, the dust and noise pollution to the surrounding area is reduced, and greater economic and social benefits are generated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a construction method for assembling a porous frame bridge according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a closed preform segment according to an embodiment of the present invention;
FIG. 3 is a schematic side view of a closed preform segment according to an embodiment of the present invention;
FIG. 4 is a schematic longitudinal assembly structure diagram of a closed prefabricated section according to an embodiment of the invention;
FIG. 5 is a schematic structural diagram of a large segment frame bridge according to an embodiment of the present invention;
in the figure: 1-preparing an upper segment; 2-prefabricating a lower segment; 3-a shear key; 4-a shear keyway; 5-permanent prestressed steel beam pipeline; 6, pre-burying a steel plate; 7-temporary prestressed anchorage means; 8-temporary prestress finish rolling deformed steel bar; 9-a temporary prestress tensioning jack; 10-a spreader; 11-first segment; 12-a second segment; 13-epoxy adhesive glue; 14-permanent prestressed steel strands; 15-tensioning jack with permanent prestressed tendons; 16-grouting layer; 17-C20 prefabricating a segment foundation mat; 18-C30 concrete foundation pad.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," 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; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, an embodiment of the present invention provides a method for assembling and constructing a porous frame bridge, which is used for manufacturing the porous frame bridge described in the above embodiment, and specifically includes the following steps: s1, paving a concrete cushion layer at the bottom of the pretreated frame section foundation pit and arranging a temporary support; s2, hoisting the closed prefabricated sections which are assembled in a vertically matched mode onto a temporary support and positioning; s3, sequentially completing longitudinal assembly of each closed prefabricated section to form a large-section frame bridge, and simultaneously tensioning temporary longitudinal prestress; s4, after the whole large-section frame bridge is installed, tensioning the permanent prestressed steel beam to apply pressure and removing the temporary longitudinal prestress; s5, grouting the permanent prestressed steel beam pipeline 5, and grouting a gap between a bottom plate of the large-segment frame bridge and a prefabricated segment foundation cushion layer; and S6, removing the temporary supporting piece at the bottom after the grouting layer reaches the preset strength, and supporting the whole large-section frame bridge on the grouting layer.
Specifically, before step S1, the method further includes excavating a frame section foundation pit and supporting the foundation pit, and performing pretreatment on the bottom of the frame section foundation pit, where the pretreatment specifically includes operations such as leveling, cleaning, and compacting the bottom plane of the foundation pit.
In step S1, a concrete cushion is laid on the bottom of the pretreated foundation pit of the frame section, and the concrete cushion is used as a buffer layer to ensure the flatness of the porous frame bridge and to improve the supporting strength of the porous frame bridge.
Then, temporary supporting pieces (such as supporting jacks or unloading blocks) are arranged on the surface of the laid concrete cushion layer and are mainly used for temporarily supporting all sections of the porous frame bridge, and the temporary supporting pieces can be detached after concrete is poured at the bottom for forming.
Referring to fig. 2, in step S2, the closed prefabricated sections that have been assembled into upper and lower sections are hoisted onto the temporary support and positioned and fixed, where the closed prefabricated sections are formed by dividing the entire porous frame bridge along the longitudinal direction (length direction), each closed prefabricated section includes two parts, namely, a prefabricated upper section 1 and a prefabricated lower section 2, and the matching and assembling of the upper and lower sections can be directly performed on the temporary support for hoisting and assembling or performed in subsequent hoisting and longitudinal assembling after other areas (such as a girder unloading area) are intensively completed.
Referring to fig. 3, in step S3, longitudinal assembly and seam gluing of the closed prefabricated segments are sequentially performed to form a structurally stable large segment frame bridge (comprising a plurality of closed prefabricated segments). Wherein, adjacent sealed prefabricated segment need stretch-draw interim longitudinal prestress when vertically assembling to guarantee interim assembly effect, improve the stability of whole porous frame bridge.
Referring to fig. 4, in step S4, after the installation of the entire large-segment frame bridge is completed according to the method described in step S3, the entire large-segment frame bridge may be fixed by tensioning the permanent prestressed steel bundles, thereby ensuring the structural stability of the entire porous frame bridge. The permanent prestressed steel beams can be provided with pipelines for mounting the permanent prestressed steel beams on the closed prefabricated sections along the longitudinal direction in advance. It should be noted that the porous frame bridge may be divided into one or more large-segment frame bridges according to the length, and when there are a plurality of large-segment frame bridges, each large-segment frame bridge is manufactured and assembled with a gap reserved according to the above method, and then the gap is processed.
In step S5, the tube 5 of permanent prestressed steel strands is grouted to achieve the positioning of the permanent prestressed steel strands and the further pressing and fixing between the closed prefabricated segments. Simultaneously, gaps between the bottom plate of the large-section frame bridge and the concrete cushion are grouted, and the large-section frame bridge is supported and permanently fixed. And (3) removing the bottom temporary supporting piece after the grouting layer 16 reaches a preset strength (has a certain supporting capacity) so as to support the whole large-section frame bridge on the grouting layer 16, and finally realizing the support and fixation of the large-section frame bridge after the grouting layer 16 is completely solidified.
The porous frame bridge assembly construction method provided by the embodiment of the invention adopts block factory prefabrication, is synchronously performed with foundation pit excavation, firstly performs the assembly of the upper and lower sections of a single prefabricated section to form a closed prefabricated section, then performs the multidirectional longitudinal assembly of a plurality of closed prefabricated sections to form a large-section frame bridge, and stretches the longitudinal prestress; in the splicing and forming process of the whole large-section frame bridge, the processes of on-site formwork erection, reinforcement binding, concrete pouring and the like are not needed, the construction progress is greatly accelerated, the interference of construction vehicles and machines to surrounding traffic is reduced to the maximum extent, the dust and noise pollution to the surrounding area is reduced, and greater economic and social benefits are generated.
On the basis of the foregoing embodiments, in order to perfect the connection between the large-segment frame bridges, the method further includes, after step S5: and S6, pouring wet-cast section concrete at the end part of each large-section frame bridge and processing deformation joints.
Specifically, for each large-section frame bridge which is spliced, gaps among the large sections need to be processed, concrete pouring is carried out on wet pouring sections at end joints of the large sections, connecting steel bars can be reserved in the wet pouring sections, and pouring and fixing of concrete are facilitated; meanwhile, deformation joints are required to be processed, and alignment precision and connection strength are guaranteed.
On the basis of the foregoing embodiments, further, in step S1, the laying of the concrete cushion and the arranging of the temporary support includes:
firstly, pouring a C30 concrete foundation pad 18 with a first preset thickness on the bottom of a foundation pit of the pretreated frame section, wherein the first preset thickness is generally between 40 and 60cm, and 50cm is selected in the embodiment.
Then, pouring a C20 prefabricated segmental foundation mat layer 17 with a second preset thickness on the C30 concrete foundation mat layer 18, and further improving the buffering and supporting performance of the whole concrete mat layer; wherein the second predetermined thickness is generally between 32-40 cm, and 36cm is selected in this embodiment.
Finally, after the laying of the two concrete mats is completed, temporary supports need to be arranged. Specifically, a reinforced concrete strip foundation can be arranged on the lower portion of the side wall, the reinforced concrete strip foundation is located above a concrete cushion layer of the bottom layer, and the temporary supporting piece can be placed on the reinforced concrete strip foundation in the preset position.
Of course, the temporary support members may also be arranged directly on the bottom concrete pad and spaced apart in the gaps between the respective reinforced concrete strip foundations and may be kept at a uniform height, so that the bottom of the entire perforated frame bridge structure may be supported by means of the temporary support members and the reinforced concrete strip foundations.
On the basis of the foregoing embodiments, further, in step S2, the assembling of the upper and lower sections of the closed prefabricated section includes:
firstly, the prefabricated upper section 1 and the prefabricated lower section 2 of the porous frame bridge are matched and assembled, the shear key 3 and the shear key groove 4 can be designed in advance at the splicing surface, and the matching precision can be improved by utilizing the matching of the shear key 3 and the shear key groove 4, and meanwhile, the assembling efficiency is also favorably improved.
Then, gluing construction is carried out on the joint of the prefabricated upper section 1 and the prefabricated lower section 2 so as to improve the binding force; the pre-buried steel plates 6 on the left and right sides (in the length direction of the perforated frame bridge) of the joint are welded to form closed prefabricated sections.
Further, the assembly of the closed prefabricated segments in this embodiment is completed on the temporary supports. Specifically, firstly, a gantry crane is adopted to hoist the prefabricated lower segment 2 from back to front to support on a temporary support member, the prefabricated lower segment 2 is adjusted and accurately positioned, then the prefabricated upper segment 1 is transported to the site, the prefabricated lower segment 2 which is positioned is slowly closed to the prefabricated lower segment 2 through the principle of matching the upper segment and the lower segment, and when the prefabricated lower segment is closed to the site, a wood wedge is used for temporarily plugging a pad between the seam of the upper segment and the seam of the lower segment, so that the segments are prevented from being damaged.
And taking out the skid after the upper section and the lower section are stabilized, limiting by using a positioning plate, and slowly driving the crown block to splice the prefabricated upper section 1 and the prefabricated lower section 2 through the three-way fine adjustment function of the gantry crane lifting mechanism until the requirements are met.
And finally, after trial assembly, hoisting the prefabricated upper section 1 away from the prefabricated lower section by about 50cm through a crown block, gluing the upper contact surface and the lower contact surface (specifically adopting epoxy adhesive glue), splicing the prefabricated upper section and the prefabricated lower section after the gluing is finished, welding embedded steel plates 6 at the splicing seams of the prefabricated upper section and the prefabricated lower section after the epoxy adhesive glue reaches the designed strength, and splicing the upper section and the lower section of all closed prefabricated sections of the whole large section into a whole in sequence.
On the basis of the foregoing embodiments, further, the S2 further includes: when each closed prefabricated section is hoisted to the supporting piece, four unloading blocks can be adopted to temporarily support four points on two sides of the closed prefabricated section, so that each closed prefabricated section is conveniently positioned and buffered, and the closed prefabricated section is prevented from colliding with the side wall of a foundation pit of the frame section and being damaged in the assembling process.
On the basis of the foregoing embodiments, further, the S3 specifically includes:
and precisely positioning the closed prefabricated section of the first section, hoisting the closed prefabricated section of the next section, drawing close to the closed prefabricated section of the first section, and trying to splice and align.
After trial assembly, the whole joint surface is subjected to gluing construction, and the temporary longitudinal prestress is accurately positioned and tensioned. Wherein the tensioning of the temporary longitudinal prestress can be realized by arranging temporary prestress anchoring devices 7 on the closed prefabricated segments and matching with temporary prestress tensioning jacks 9.
And sequentially assembling a plurality of closed prefabricated sections according to the steps to form the large-section frame bridge, wherein the closed prefabricated sections of each section are assembled with the closed prefabricated sections of the previous section according to the construction sequence of splicing, gluing and tensioning temporary prestress, and finally the large-section frame bridge is formed.
The assembly process is as follows:
1) the closed prefabricated segment (first segment 11) of the first segment is positioned and fixed, 8 control points are buried in the bottom plate of the prefabricated lower segment 2 when the closed prefabricated segment of the first segment is prefabricated, theoretical assembling coordinates of the 8 control points are provided, after the accurate positioning is measured, the lifting appliance 10 can be loosened, and the weight of the prefabricated lower segment 2 is supported by the temporary support.
2) And hoisting the next section of the closed prefabricated section (the second section 12) to the first section of the closed prefabricated section at the same height by using a hoisting crane, slowly drawing the next section of the closed prefabricated section to the first section 11, and finely adjusting the closed prefabricated section by using the three-way fine adjustment function of the gantry crane structure until the requirements are met. After the trial splicing is finished, the second section 12 is 50cm away from the first section 11 through the crown block, and then the gluing construction can be started;
3) during assembly, joints of all the sections are bonded by epoxy adhesive glue, so that the connection strength before adjacent closed prefabricated sections is improved, and meanwhile, the sealing and anti-leakage effects can be achieved. The epoxy adhesive adopts a bi-component product and does not contain components which corrode reinforcing steel bars and influence the durability of a concrete structure.
4) After the adjacent closed prefabricated sections are glued and closed, the front section and the rear section are connected and compressed through the temporary prestress finish rolling deformed steel bar 8, and the temporary prestress finish rolling deformed steel bar 8 passes through the temporary prestress anchoring device 7. And (3) checking the concrete combination condition of the joint (the joint follows the principle of taking the bottom plate to be connected in the same direction and the left and right web plates to be symmetrical), synchronously stretching and finely rolling the deformed steel bars in a grading manner after meeting the requirements, checking the glue connection condition around the joint and timely cleaning the glue. And (4) sequentially and repeatedly operating the assembly construction of each prefabricated section according to the procedures until the construction of the whole large-section frame bridge is completed.
On the basis of the above embodiments, the step S4 further includes: the tensioning jacks are distributed at two ends of the permanent prestressed steel strand 14 and are symmetrically tensioned; after all the closed prefabricated sections of the large-section frame bridge are assembled, permanent prestress tensioning can be carried out; and unloading the longitudinal temporary prestress after the permanent prestress tension is finished.
Specifically, the large-section frame bridge adopts 8 bundles of permanent prestressed steel strands 14 to realize permanent prestressed tensioning, adopts 16 permanent prestressed strand tensioning jacks 15 to be arranged at two ends of each corresponding permanent prestressed steel strand 14, and simultaneously symmetrically tensions the permanent prestressed steel strands.
And after assembling all the block prefabricated segments of the whole section, the steel strand is strung and an anchorage device is installed, and permanent prestress tensioning is carried out. And unloading the longitudinal temporary prestress after the permanent prestress tension is finished.
According to the construction method for assembling the porous frame bridge, the tension permanent prestress is formed after the large-section frame bridge is assembled, so that the connection strength of the whole section can be improved, and the stability of the whole structure is facilitated.
On the basis of the foregoing embodiments, further in S5, the grouting a gap between the bottom plate of the large-segment frame bridge and the precast-segment foundation mat includes:
after the large-section frame bridge is assembled, adopting a foaming agent to block the edge gap of the large-section frame bridge, and then directly pouring mixed M40 cement slurry into the large-section frame bridge from a slurry inlet hole for bottom grouting until the water slurry flows out from a peripheral slurry outlet hole;
the concrete cushion and the bottom plate (2 beam bottoms of the lower prefabricated section) of the large-section frame bridge are filled with cement paste by utilizing the self gravity of the frame bridge, and the cement paste is replenished once after 12 hours so as to ensure that the bottom of the frame is pressed to be compact. And after the strength of the cement paste meets the design requirement, removing the temporary supporting piece at the bottom of the segment, and moving to the lower segment for construction.
As shown in fig. 2 to 5, an embodiment of the present invention provides a porous frame bridge, including: the large-section frame bridges are uniformly distributed on a concrete cushion layer laid at the bottom of a frame section foundation pit, and a grouting layer 16 is filled between the bottom of the large-section frame bridge and the concrete cushion layer; the large-section frame bridge comprises a plurality of closed prefabricated sections which are sequentially spliced along the longitudinal direction, and each closed prefabricated section is formed by splicing a prefabricated upper section 1 and a prefabricated lower section 2.
Furthermore, the porous frame bridge comprises a plurality of large-section frame bridges which are arranged at intervals, and connecting reinforcing steel bars are reserved at the end parts of the adjacent large-section frame bridges and are fixedly connected through concrete.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A porous frame bridge assembling construction method is characterized by comprising the following steps:
s1, paving a concrete cushion layer at the bottom of the pretreated frame section foundation pit and arranging a temporary support;
s2, hoisting a closed prefabricated section formed by assembling a prefabricated upper section and a prefabricated lower section onto the temporary support and positioning;
s3, sequentially completing longitudinal assembly and seam gluing of each closed prefabricated section to form a large-section frame bridge, and simultaneously tensioning temporary longitudinal prestress;
s4, after the whole large-section frame bridge is installed, applying permanent prestressed steel beams and removing temporary longitudinal prestress;
and S5, grouting the gap between the bottom plate of the large-section frame bridge and the concrete cushion, and removing the temporary supporting piece after the grouting layer reaches the preset strength.
2. The assembly construction method of a porous frame bridge according to claim 1, further comprising, after the S5:
and S6, pouring wet-cast section concrete at the end part of each large-section frame bridge and processing deformation joints.
3. The perforated frame bridge erection construction method of claim 1 or 2, wherein in said S1, said laying of a concrete pad and arranging of temporary supports comprises:
pouring a C30 concrete foundation cushion layer with a first preset thickness at the bottom of the foundation pit of the frame section;
pouring C20 prefabricated segment foundation mats with second preset thickness;
and a reinforced concrete strip foundation for placing the temporary support is arranged at the lower part of the side wall.
4. The method of assembling a porous frame bridge according to claim 1 or 2, wherein the assembling of the prefabricated upper section and the prefabricated lower section comprises:
matching the prefabricated upper segment with the prefabricated lower segment;
and gluing the joints of the prefabricated upper section and the prefabricated lower section, and welding the embedded steel plates at the joints to form the closed prefabricated sections.
5. The perforated frame bridge erection construction method of claim 1 or 2, wherein said S2 further comprises:
when each closed prefabricated section is hoisted, unloading blocks are arranged on two sides of each closed prefabricated section.
6. The perforated frame bridge erection construction method of claim 1 or 2, wherein said S3 further comprises:
positioning the closed prefabricated section of the first section, hoisting the closed prefabricated section of the next section to approach the closed prefabricated section of the first section, and trying to splice and align;
gluing the joint surface for construction, and tensioning temporary longitudinal prestress;
and sequentially assembling a plurality of closed prefabricated sections to form the large-section frame bridge.
7. The perforated frame bridge erection construction method of claim 1 or 2, wherein said S4 further comprises:
stretching the permanent prestressed steel strand by adopting stretching jacks which are distributed at two ends of the permanent prestressed steel strand and are symmetrical;
after all the closed prefabricated sections of the large-section frame bridge are assembled, permanent prestress tensioning can be carried out;
and unloading the longitudinal temporary prestress after the permanent prestress tension is finished.
8. The assembly construction method of the porous frame bridge according to claim 1 or 2, wherein the step S5 specifically comprises:
after the large-section frame bridge is assembled, filling gaps at the edges of the large-section frame bridge;
grouting cement slurry into a gap below a bottom plate of the large-section frame bridge until the cement slurry overflows from the peripheral slurry outlet holes;
filling cement slurry between the concrete cushion layer and the bottom plate of the large-section frame bridge by utilizing the self gravity of the large-section frame bridge, and supplementing pressure after a preset time interval;
and after the strength of the cement paste meets the design requirement, removing the temporary support piece at the bottom of the large-section frame bridge.
9. A porous frame bridge, characterized in that, by using the porous frame bridge assembly construction method as claimed in any one of claims 1 to 8, the porous frame bridge comprises at least one large-section frame bridge, the large-section frame bridge is arranged on a concrete cushion layer laid at the bottom of a frame section foundation pit, and a grouting layer is filled between the bottom of the large-section frame bridge and the concrete cushion layer;
the large-section frame bridge comprises a plurality of closed prefabricated sections which are sequentially spliced along the longitudinal direction, and each closed prefabricated section is formed by splicing a prefabricated upper section and a prefabricated lower section.
10. The porous frame bridge according to claim 9, wherein the large-section frame bridge is provided in plurality, the large-section frame bridge is arranged at intervals, and connecting steel bars are reserved at the ends of the adjacent large-section frame bridges and are fixedly connected through concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911031573.XA CN110747903A (en) | 2019-10-28 | 2019-10-28 | Porous frame bridge and assembling construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911031573.XA CN110747903A (en) | 2019-10-28 | 2019-10-28 | Porous frame bridge and assembling construction method thereof |
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| CN113062355A (en) * | 2021-03-26 | 2021-07-02 | 中交路桥建设有限公司 | Simple and rapid prefabricated pipe gallery head segment installation positioning method |
| CN113309146A (en) * | 2021-05-31 | 2021-08-27 | 中交第一航务工程局有限公司 | Final joint water stopping device and mounting method |
| CN114108600A (en) * | 2021-11-26 | 2022-03-01 | 华能清能通榆电力有限公司 | Fan foundation of prefabricated sheet pile assembly type connecting structure and construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113062355A (en) * | 2021-03-26 | 2021-07-02 | 中交路桥建设有限公司 | Simple and rapid prefabricated pipe gallery head segment installation positioning method |
| CN113309146A (en) * | 2021-05-31 | 2021-08-27 | 中交第一航务工程局有限公司 | Final joint water stopping device and mounting method |
| CN114108600A (en) * | 2021-11-26 | 2022-03-01 | 华能清能通榆电力有限公司 | Fan foundation of prefabricated sheet pile assembly type connecting structure and construction method thereof |
| CN114108600B (en) * | 2021-11-26 | 2024-03-29 | 华能清能通榆电力有限公司 | Fan foundation with prefabricated sheet pile assembly type connecting structure and construction method thereof |
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