CN220977727U - Continuous box girder No. 0 block construction steel pipe pile support and pre-compaction system - Google Patents

Abstract

The application discloses a steel pipe pile support and a pre-pressing system for continuous box girder No. 0 block construction, which comprises a bearing platform, wherein finish rolling deformed steel bars and embedded bars are pre-embedded on the bearing platform, the steel pipe pile support is arranged on the bearing platform, and the upper ends of the embedded bars are connected with the lower ends of the steel pipe pile support; the thin-wall hollow pier is positioned at the center of the steel pipe pile bracket; the steel pipe pile support is provided with a distribution frame, a plurality of transverse pre-compression beams are arranged on the distribution frame, the jack cushion plate is arranged on the transverse pre-compression beams, the through jack is arranged on the jack cushion plate, the through jack is provided with a longitudinal pre-compression beam, and the upper end of the finish rolling screw thread steel is anchored on the longitudinal pre-compression beam after passing through a hole on the jack cushion plate and a hole in the center of the through jack. The application solves the problems of time and labor waste in the prior art of construction of the pre-pressing sand bags or the concrete precast blocks. According to the application, a steel pipe foundation is not required to be poured outside the bearing platform, so that the bearing platform can be fully facilitated to serve as a construction site.

Description

Continuous box girder No. 0 block construction steel pipe pile support and pre-compaction system

Technical Field

The application belongs to the technical field of bridges, and particularly relates to a steel pipe pile support for continuous box girder No. 0 block construction and a pre-pressing system.

Background

Along with development of bridge standardized construction, quality management is strict, in order to eliminate inelastic deformation of a support, support pre-pressing work is more and more important, and pre-pressing test of bridge load becomes a key work for engineering quality standard detection. In the construction of the No. 0 block of the continuous beam bridge, a bracket method is generally adopted for construction, the elastic deformation and inelastic deformation values of the bracket are tested through bracket prepressing, the bracket pre-camber is calculated according to measured data, and a reliable basis is provided for the formwork erection elevation; the non-elastic deformation of the bracket is eliminated by simulating the strength, the rigidity and the stability of the weight checking structure; and a basis is provided for the control of the construction elevation through simulating the weight. The prepressing of traditional continuous beam bridge support back pressure construction adopts sand bag or concrete prefabricated block to pile up and carry out actual simulation test on the bridge, need carry a large amount of and these article of bearing to the bridge from the low department, need pay a large amount of manpower and materials, sand or water are wasted seriously, and the site operation environment is relatively poor in addition, and is wasted time and energy, only can accomplish with heavy lifting and handling equipment of taking advantage of, has certain construction risk moreover.

Disclosure of utility model

The embodiment of the application solves the problems of time and labor waste in the prior art of construction of a sand bag or a concrete precast block for prepressing by providing the continuous box girder No. 0 block construction steel pipe pile support and the prepressing system.

In order to achieve the above purpose, the embodiment of the utility model provides a steel pipe pile support and a pre-pressing system for continuous box girder No. 0 block construction, which comprises a bearing platform, a steel pipe pile support, a thin-wall hollow pier, finish rolling screw steel, a longitudinal pre-pressing girder, a transverse pre-pressing girder, a jack pad plate, a through jack, embedded bars and a distribution frame;

The bearing platform is pre-embedded with finish rolling deformed steel bars and pre-embedded steel bars, the steel pipe pile support is arranged on the bearing platform, and the upper ends of the pre-embedded steel bars are connected to the lower ends of the steel pipe pile support; the thin-wall hollow pier is positioned at the center of the steel pipe pile bracket;

The steel pipe pile support is provided with a distribution frame, a plurality of transverse pre-compression beams are arranged on the distribution frame, the jack cushion plate is arranged on the transverse pre-compression beams, the through jack is arranged on the jack cushion plate, the through jack is provided with a longitudinal pre-compression beam, and the upper end of the finish rolling screw thread steel is anchored on the longitudinal pre-compression beam after passing through a hole on the jack cushion plate and a hole in the center of the through jack.

In one possible implementation, the distribution frame comprises a plurality of longitudinal distribution beams and a plurality of transverse distribution beams; the plurality of transverse distribution beams are provided with a plurality of longitudinal distribution beams, and the transverse distribution beams and the longitudinal distribution beams are vertically arranged.

In one possible implementation, the finish-rolled deformed steel bar includes a first finish-rolled deformed steel bar, a reinforcing bar straight-threaded sleeve, and a second finish-rolled deformed steel bar, the first finish-rolled deformed steel bar is pre-buried on the bearing platform, the first finish-rolled deformed steel bar is connected with the second finish-rolled deformed steel bar through the reinforcing bar straight-threaded sleeve, and an upper end of the second finish-rolled deformed steel bar is anchored on the longitudinal pre-pressed beam.

In one possible implementation, the diameter of the embedded bars is 20mm, the length of the embedded bars is 0.35m, and the depth of the embedded bars is 0.3m; the length of the first finish rolled deformed steel bar is 1.2m, and the burial depth of the first finish rolled deformed steel bar is 1m.

In one possible implementation manner, the steel pipe pile support comprises a plurality of support steel pipes, and the support steel pipes positioned in the circumferential direction of the thin-wall hollow pier are connected through a plurality of channel steel;

the joint of the bracket steel pipe and the channel steel is connected through a connecting plate.

In one possible implementation manner, the thin-wall hollow pier is horizontally provided with a vent hole and a counter-pulling hole, and the connecting steel bars penetrate through the vent hole and the counter-pulling hole and are connected to the support steel pipes on two sides.

In one possible implementation, the outer stent steel tube in the steel pipe pile stent is laid obliquely outwards.

In one possible implementation manner, a split steel pipe is pre-buried in the thin-wall hollow pier, and a hole in the center of the split steel pipe is a split hole.

In one possible implementation, the longitudinal distribution beam, the transverse pre-compression beam, and the plurality of longitudinal pre-compression beams all employ double-spliced I45a I-beams, and the transverse distribution beam employs I32I-beams.

In one possible implementation, the number of jack pads is multiple, and the size of the jack pad is 50cm by 2cm, and the diameter of the opening in the center of the jack pad is 5cm.

One or more technical solutions provided in the embodiments of the present utility model at least have the following technical effects or advantages:

Compared with the traditional sand bag or concrete precast block prepressing method, the steel pipe pile support prepressing system can avoid the risk of uneven stress and overturning caused by asymmetrical stacking of the sand bags or concrete precast blocks in the prepressing construction process, and greatly reduces the construction safety risk. The steel pipe pile bracket has a simple structure and is easy to set up; and the jack prepressing is intelligently controlled by using a full-automatic system, so that the operation is simple. The steel pipe pile support is erected by adopting the method, a steel pipe foundation does not need to be poured outside the bearing platform, and the bearing platform can be fully facilitated to serve as a construction site. The traditional prepressing method requires a large-area site to stack sand bags and concrete precast blocks, and is difficult to transport. The pre-buried finish rolling deformed steel bars in the bearing platform are symmetrically pre-pressed at two ends by a back pressure method, and the pre-pressing can be completed within 2-3 days generally, so that the construction period is saved compared with the traditional pre-pressing method. The back pressure method is adopted to symmetrically pre-press the two ends, so that design parameters, bearing capacity and rationality and safety of the design of the steel pipe pile support can be verified, inelastic deformation of the steel pipe pile support is eliminated, elastic deformation value of the bracket is measured, and scientific and accurate data are provided for subsequent construction. The steel pipe pile support is erected by adopting the method, a steel pipe foundation is not required to be poured outside the bearing platform, time and labor are saved, safety is high, a river channel cannot be disturbed, and environmental protection is facilitated. The opposite pressure method is adopted to symmetrically pre-press the two ends, so that the construction site is saved, the waste of sand and broken stone is reduced, the adverse effect of exploitation on the environment is reduced, and the ecological environment is protected.

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 diagram of a continuous box girder No. 0 block construction steel pipe pile support and a pre-compression system according to an embodiment of the present utility model.

Fig. 2 is a side view of fig. 1.

Reference numerals: 1-a bearing platform; 2-a steel pipe pile bracket; 21-a support steel tube; 3-thin wall hollow piers; 4-finish rolling deformed steel bars; 5-longitudinally pre-pressing the beam; 6-transverse pre-compression beams; 7-jack pad plates; 8-a through jack; 9-embedding reinforcing steel bars; 10-connecting reinforcing steel bars; 11-channel steel; 12-connecting plates; 13-oppositely pulling the steel pipe; 14-dispensing rack.

Detailed Description

The following description of the embodiments of the present utility model 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 utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the embodiments of the present utility model, 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 utility model 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 utility model. 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 utility model will be understood by those of ordinary skill in the art according to specific circumstances.

As shown in fig. 1 and 2, the steel pipe pile support and pre-pressing system for continuous box girder No. 0 construction provided by the embodiment of the utility model comprises a bearing platform 1, a steel pipe pile support 2, a thin-wall hollow pier 3, finish rolling screw steel 4, a longitudinal pre-pressing beam 5, a transverse pre-pressing beam 6, a jack pad 7, a through jack 8, embedded bars 9 and a distribution frame 14.

Finish rolling deformed steel bar 4 and embedded steel bars 9 are embedded in the bearing platform 1, the steel pipe pile support 2 is arranged on the bearing platform 1, and the upper ends of the embedded steel bars 9 are connected to the lower ends of the steel pipe pile support 2. The thin-wall hollow pier 3 is positioned at the center of the steel pipe pile bracket 2.

The steel pipe pile support 2 is provided with a distribution frame 14, a plurality of transverse pre-compression beams 6 are arranged on the distribution frame 14, jack cushion plates 7 are arranged on the transverse pre-compression beams 6, a through jack 8 is arranged on the jack cushion plates 7, a longitudinal pre-compression beam 5 is arranged on the through jack 8, and the upper end of finish rolling screw thread steel 4 is anchored on the longitudinal pre-compression beam 5 after passing through a hole on the jack cushion plates 7 and a hole in the center of the through jack 8.

After the pre-pressing is finished, the longitudinal pre-pressing beam 5, the transverse pre-pressing beam 6, the jack pad plate 7 and the through jack 8 are removed, and the distributing frame 14 is used as a supporting platform of a bridge bottom plate, a web plate and a wing plate. After the installation of the pre-pressing system is inspected and qualified, pre-pressing is performed symmetrically at two ends of the finish-rolled deformed steel 4 pre-embedded in the bearing platform 1 by a counter-pressure method to eliminate inelastic deformation, and an elastic deformation value and an inelastic deformation value under the corresponding load effect are measured, so that a basis is provided for setting enough pre-camber in formwork supporting. The weight of the part of the beam body suspended from the pier top is taken as the base number 0 of the pre-load. The support pre-pressing is carried out in three stages, the loading weight is 50%, 100% and 120% of the design load, each loading is carried out for 30min for observation once, and after all loading is completed, the load is carried out for 30min, and the observation points are measured by measuring staff and recorded in detail. And during the pre-pressing period, checking welding seams of the support, recording checking results, carrying out arrangement analysis on pre-pressing data, and reporting to a supervision engineer and a monitoring unit.

Compared with the traditional sand bag or concrete precast block prepressing method, the steel pipe pile support 2 prepressing system can avoid the risk of overturning caused by uneven stress due to asymmetric stacking of the sand bags or concrete precast blocks in the prepressing construction process, and greatly reduces the construction safety risk. The steel pipe pile support 2 is simple in structure and easy to erect. And the jack prepressing is intelligently controlled by using a full-automatic system, so that the operation is simple. The steel pipe pile bracket 2 is erected by adopting the method, a steel pipe foundation does not need to be poured outside the bearing platform 1, and the bearing platform 1 can be fully facilitated to serve as a construction site. The traditional prepressing method requires a large-area site to stack sand bags and concrete precast blocks, and is difficult to transport. The pre-buried finish rolling deformed steel bars 4 in the bearing platform 1 are symmetrically pre-pressed at two ends by a back pressure method, and the pre-pressing can be completed within 2 to 3 days generally, so that the construction period is saved compared with the traditional pre-pressing method. The back pressure method is adopted to symmetrically pre-press the two ends, so that design parameters and bearing capacity of the steel pipe pile support 2 and rationality and safety of the design of the steel pipe pile support 2 can be verified, inelastic deformation of the steel pipe pile support 2 is eliminated, elastic deformation values of the steel pipe pile support 2 are measured actually, and scientific and accurate data are provided for follow-up construction. The steel pipe pile support 2 is erected by adopting the method, a steel pipe foundation is not required to be poured outside the bearing platform 1, time and labor are saved, safety is high, a river channel is not disturbed, and environmental protection is facilitated. The opposite pressure method is adopted to symmetrically pre-press the two ends, so that the construction site is saved, the waste of sand and broken stone is reduced, the adverse effect of exploitation on the environment is reduced, and the ecological environment is protected.

In this embodiment, the distribution frame 14 includes a plurality of longitudinal distribution beams and a plurality of transverse distribution beams. The plurality of transverse distribution beams are provided with a plurality of longitudinal distribution beams, and the transverse distribution beams and the longitudinal distribution beams are vertically arranged.

The transverse distribution beam and the longitudinal distribution beam transmit the acting force of the jack.

In this embodiment, the finish rolling deformed steel bar 4 includes a first finish rolling deformed steel bar, a reinforcing bar straight threaded sleeve, and a second finish rolling deformed steel bar, the first finish rolling deformed steel bar is pre-buried on the bearing platform 1, the first finish rolling deformed steel bar is connected with the second finish rolling deformed steel bar through the reinforcing bar straight threaded sleeve, and the upper end of the second finish rolling deformed steel bar is anchored on the longitudinal pre-compression beam 5.

The finish rolling deformed steel bar 4 is an assembly, so that the finish rolling deformed steel bar 4 with a long length is not required to be embedded in the construction of the bearing platform 1, and the construction is facilitated.

In this embodiment, the diameter of the embedded steel bar 9 is 20mm, the length of the embedded steel bar 9 is 0.35m, and the embedded depth of the embedded steel bar 9 is 0.3m. The length of the first finish rolled deformed steel bar is 1.2m, and the burial depth of the first finish rolled deformed steel bar is 1m.

During construction of the bearing platform 1, the embedded bars 9 and the first finish-rolled deformed steel bars are embedded in the bearing platform 1, and the embedded bars 9 are welded and connected with the lower ends of the steel pipe pile brackets 2. The first finish rolled deformed steel bar and the second finish rolled deformed steel bar adopt JL32 finish rolled deformed steel bars. The finish rolling twisted steel is a straight bar with large diameter, high strength and high dimensional accuracy, which is rolled with discontinuous external threads on the whole steel bar, and can meet the use requirement of the application.

In this embodiment, the steel pipe pile holder 2 includes a plurality of holder steel pipes 21, and the holder steel pipes 21 located in the circumferential direction of the thin-walled hollow pier 3 are connected by a plurality of channel steel 11.

The joint of the bracket steel pipe 21 and the channel steel 11 is connected by a connecting plate 12.

The steel pipe pile brackets 2 include seven rows of bracket groups, each row of bracket groups including four bracket steel pipes 21 arranged at intervals.

The number of the longitudinal distribution beams is seven, the seven longitudinal distribution beams are in one-to-one correspondence with the seven rows of bracket groups, and each longitudinal distribution beam is arranged at the upper end of each row of four bracket steel pipes 21.

The plurality of channel steel 11 comprises a plurality of channel steel 11 which are horizontally arranged and a plurality of channel steel which are obliquely arranged, and the channel steel 11 and the connecting plate 12 mainly improve the structural stability of the steel pipe pile bracket 2. The bracket steel pipes 21, the channel steel 11 and the connecting plate 12 are all connected through welding.

In this embodiment, the thin-wall hollow pier 3 is horizontally provided with a vent hole and a counter-pulling hole, the connecting steel bar 10 passes through the vent hole and the counter-pulling hole, and the connecting steel bar 10 is connected to the bracket steel pipes 21 on both sides.

The number of connecting bars 10 can be increased by the vent holes and the counter-pull holes, thereby improving the structural stability of the steel pipe pile holder 2. The joint bar 10 adopts JL32 finish rolling deformed bar.

In this embodiment, the outer holder steel pipes 21 in the steel pipe pile holders 2 are arranged obliquely outward.

Since the outer support steel pipes 21 are arranged obliquely outward, it is not necessary to cast a steel pipe foundation on the outer side of the table 1, and the table 1 can be sufficiently used as a construction site.

In this embodiment, the thin-wall hollow pier 3 is embedded with a split steel pipe 13, and the hole in the center of the split steel pipe 13 is a split hole.

The opposite-pulling holes can be formed by arranging the opposite-pulling steel pipes 13, and the structural strength and the appearance of the thin-wall hollow pier 3 are not affected.

In this embodiment, the longitudinal distribution beam, the transverse pre-compression beam 6 and the plurality of longitudinal pre-compression beams 5 all use double-spliced I45a I-beams, and the transverse distribution beam uses I32I-beams.

The longitudinal distribution beam, the transverse pre-compression beam 6, the transverse distribution beam and the plurality of longitudinal pre-compression beams 5 have high structural form strength and are convenient to process.

In this embodiment, the number of jack pads 7 is several, the size of the jack pads 7 is 50cm×50cm×2cm, and the diameter of the hole in the center of the jack pads 7 is 5cm.

The number of the through jacks 8 is plural, and the jack pad 7 is used for applying the acting force of the jacks to the transverse pre-compression beam 6 to play a role of uniform acting force.

In the present embodiment, it will be apparent to those skilled in the art that the present utility model is not limited to the details of the above-described exemplary embodiments, but that the present utility model 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 utility model 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 (10)

1. A steel pipe pile support and pre-compaction system for continuous box girder No. 0 block construction, which is characterized in that: the steel pipe pile comprises a bearing platform (1), a steel pipe pile bracket (2), a thin-wall hollow pier (3), finish rolling deformed steel bars (4), a longitudinal pre-compression beam (5), a transverse pre-compression beam (6), a jack pad (7), a punching type jack (8), embedded bars (9) and a distribution frame (14);

finish rolling deformed steel bars (4) and embedded steel bars (9) are embedded in the bearing platform (1), the steel pipe pile support (2) is arranged on the bearing platform (1), and the upper ends of the embedded steel bars (9) are connected to the lower ends of the steel pipe pile support (2); the thin-wall hollow pier (3) is positioned at the center of the steel pipe pile bracket (2);

Be provided with distribution frame (14) on steel-pipe pile support (2), be provided with a plurality of horizontal pre-compression roof beams (6) on distribution frame (14), jack pad board (7) set up on a plurality of horizontal pre-compression roof beams (6), wear heart jack (8) to set up on jack pad board (7), be provided with vertical pre-compression roof beam (5) on wear heart jack (8), anchor is on vertical pre-compression roof beam (5) after the upper end of finish rolling screw steel (4) passes the hole on jack pad board (7) and the hole in heart of heart jack (8).

2. The continuous box girder No. 0 block construction steel pipe pile support and pre-compression system according to claim 1, wherein: the distribution frame (14) comprises a plurality of longitudinal distribution beams and a plurality of transverse distribution beams; the plurality of transverse distribution beams are provided with a plurality of longitudinal distribution beams, and the transverse distribution beams and the longitudinal distribution beams are vertically arranged.

3. The continuous box girder No. 0 block construction steel pipe pile support and pre-compression system according to claim 2, wherein: finish rolling deformed steel bar (4) include first finish rolling deformed steel bar, the straight screw thread sleeve of reinforcing bar and second finish rolling deformed steel bar, and first finish rolling deformed steel bar is pre-buried on cushion cap (1), and first finish rolling deformed steel bar passes through the straight screw thread sleeve of reinforcing bar and is connected with second finish rolling deformed steel bar, and the upper end anchor of second finish rolling deformed steel bar is on vertical pre-compression roof beam (5).

4. The continuous box girder No. 0 block construction steel pipe pile support and pre-compression system according to claim 3, wherein: the diameter of the embedded steel bar (9) is 20mm, the length of the embedded steel bar (9) is 0.35m, and the embedded depth of the embedded steel bar (9) is 0.3m; the length of the first finish rolled deformed steel bar is 1.2m, and the burial depth of the first finish rolled deformed steel bar is 1m.

5. The continuous box girder No. 0 block construction steel pipe pile support and pre-compaction system according to claim 4, wherein: the steel pipe pile support (2) comprises a plurality of support steel pipes (21), and the support steel pipes (21) positioned in the circumferential direction of the thin-wall hollow pier (3) are connected through a plurality of channel steels (11);

the joint of the bracket steel pipe (21) and the channel steel (11) is connected through a connecting plate (12).

6. The continuous box girder No. 0 block construction steel pipe pile support and pre-compaction system according to claim 5, wherein: the thin-wall hollow pier (3) is horizontally provided with a vent hole and a counter-pulling hole, the connecting steel bars (10) penetrate through the vent hole and the counter-pulling hole, and the connecting steel bars (10) are connected with support steel pipes (21) on two sides.

7. The continuous box girder No. 0 block construction steel pipe pile support and pre-compression system according to claim 6, wherein: the support steel pipes (21) at the middle and outer sides of the steel pipe pile support (2) are arranged outwards in an inclined mode.

8. The continuous box girder No. 0 block construction steel pipe pile support and pre-compression system according to claim 7, wherein: the thin-wall hollow pier (3) is internally embedded with a counter-pulling steel pipe (13), and a hole in the center of the counter-pulling steel pipe (13) is a counter-pulling hole.

9. The continuous box girder No. 0 block construction steel pipe pile support and pre-compression system according to claim 8, wherein: the longitudinal distribution beam, the transverse pre-compression beam (6) and the longitudinal pre-compression beams (5) are all made of double-spliced I45a I-steel, and the transverse distribution beam is made of I32I-steel.

10. The continuous box girder No. 0 block construction steel pipe pile support and pre-compression system according to claim 9, wherein: the number of the jack cushion plates (7) is more than one, the size of the jack cushion plates (7) is 50cm multiplied by 2cm, and the diameter of an opening hole in the center of the jack cushion plates (7) is 5cm.