CN214459689U - Cast-in-place box girder support of weak soil foundation - Google Patents
Cast-in-place box girder support of weak soil foundation Download PDFInfo
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- CN214459689U CN214459689U CN202120179695.XU CN202120179695U CN214459689U CN 214459689 U CN214459689 U CN 214459689U CN 202120179695 U CN202120179695 U CN 202120179695U CN 214459689 U CN214459689 U CN 214459689U
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Abstract
The utility model discloses a soft soil foundation cast-in-place box girder bracket, belonging to the technical field of bridge cast-in-place box girder construction, comprising a distribution girder, a longitudinal girder, a transverse bearing girder, a steel pipe upright post and a bracket foundation which are arranged from top to bottom in sequence; part of the steel pipe upright columns are arranged on a bearing platform of the bridge, and part of the steel pipe upright columns are arranged on the support foundation; the support foundation is a prestressed pipe pile, a pile cap is arranged at the top of the prestressed pipe pile, and the steel pipe stand is connected with the prestressed pipe pile into a whole through the pile cap. The utility model discloses the cast-in-place case beam bracket of weak soil foundation, the support adopt the few support system that steel-pipe pile and bailey beam are constituteed, set up the steel-pipe pile stand under the bridge promptly, go up to establish bailey beam, set up modular system on the bailey beam, improved holistic stability.
Description
Technical Field
The utility model relates to a cast-in-place case roof beam construction technical field of bridge especially relates to a cast-in-place case roof beam support of weak soil foundation.
Background
The common support structure form for the cast-in-place box girder construction comprises a full support system and a few support system. A full-hall bracket system is adopted, namely, a coil buckle type scaffold is fully distributed under a beam, and a template bracket is supported on square wood or section steel on the top of an inner upright post. The construction scheme is suitable for the construction of the land cast-in-place box girder with good geological condition and not high pier height (generally not more than 8m), and if the pier height is higher than 8m and a mud layer is thick and the geological condition is poor, the foundation treatment difficulty is high, the foundation reinforcement cost is high, the construction risk is large, and the construction quality is difficult to guarantee.
Therefore, the few-bracket system formed by the steel pipe columns and the Bailey beams is adopted, namely the steel pipe column is arranged under the bridge, the Bailey beam is arranged on the Bailey beam, the module system is arranged on the Bailey beam, and the 2-span or 3-span bracket is arranged according to the span size of the cast-in-situ box beam, so that the system is suitable for the construction of the cast-in-situ box beam with large geological condition and high pier height.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects in the prior art, the soft soil foundation cast-in-place box girder support is provided, the support adopts a few support systems consisting of steel pipe piles and Bailey girders, namely, steel pipe pile stand columns are arranged under a bridge, the Bailey girders are arranged on the steel pipe pile stand columns, and a module system is arranged on the Bailey girders, so that the overall stability is improved.
The utility model provides a technical scheme that its technical problem adopted does:
the soft soil foundation cast-in-place box girder support comprises a distribution girder, a longitudinal girder, a transverse bearing girder, a steel pipe upright post and a support foundation which are arranged from top to bottom in sequence; part of the steel pipe upright columns are arranged on a bearing platform of the bridge, and part of the steel pipe upright columns are arranged on the support foundation; the support foundation is a prestressed pipe pile, a pile cap is arranged at the top of the prestressed pipe pile, and the steel pipe stand is connected with the prestressed pipe pile into a whole through the pile cap.
Furthermore, flange embedded parts are installed in the pile cap and the bearing platform, and the steel pipe support is respectively connected with the flange embedded parts in the pile cap and the flange embedded parts in the bearing platform through flanges.
Further, the longitudinal beam is a Bailey beam.
Furthermore, an unloading sand box is arranged between the steel pipe upright post and the transverse bearing beam.
Further, the distribution beam comprises a transverse distribution beam and a longitudinal distribution beam arranged above the transverse distribution beam.
Further, the steel pipe stand includes steel stand, parallel connection and bracing.
Further, the transverse bearing beam is I-shaped steel.
Furthermore, square timber is arranged above the distribution beam, and a bamboo plywood is arranged above the square timber.
Compared with the prior art, the beneficial effects of the utility model reside in that:
1. the utility model discloses an example soft soil foundation cast-in-place box girder bracket, which adopts a few bracket system consisting of prestressed pipe piles and pile cap tie beams, and is suitable for geology with poor geological condition and thick sludge along the line;
2. the utility model discloses an example soft soil foundation cast-in-place box girder bracket replaces the steel-pipe pile with the prestressed pipe pile, need not to extract the prestressed pipe pile after the construction is accomplished, has simplified the construction flow, has reduced construction cost;
3. the utility model discloses a soft soil foundation cast-in-place box girder bracket of example, in the cushion cap scope, the steel pipe stand can form the atress system of bearing jointly with the help of the cushion cap, when the cushion cap is under construction, the flange dish built-in fitting of installation utilizes the cushion cap as steel pipe stand support basis, satisfies cast-in-place box girder bracket basis and bears the weight of the requirement;
4. the utility model discloses a soft soil foundation cast-in-place box beam support of example outside the cushion cap scope, carries out support foundation through adopting the prestressing force tubular pile to handle, sets up the pile cap on the tubular pile, connects into whole through the straining beam between the tubular pile of same group, improves overall stability, sets up the ring flange built-in fitting in the pile cap, and the steel pipe stand passes through the ring flange built-in fitting and reliably is connected between the prestressing force tubular pile.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1 is a schematic structural diagram of the present embodiment;
FIG. 2 is a sectional view taken along line A-A of the present embodiment;
FIG. 3 is a sectional view at B-B of the present embodiment;
FIG. 4 is an enlarged view of the present embodiment at A;
FIG. 5 is a schematic view of the pile cap and tie beam structure of the present embodiment;
FIG. 6 is a schematic diagram of the Faraday embedment structure in position B of this embodiment.
In the figure: 1-longitudinal distribution beam, 2-transverse distribution beam, 3-bamboo plywood, 4-square timber, 5-Bailey beam, 6-transverse bearing beam, 7-unloading sand box, 8-pile cap, 9-tie beam, 10-prestressed pipe pile, 11-steel pipe upright, 12-steel upright, 13-diagonal brace, 14-parallel connection and 15-flange embedded part.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and are not limiting of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1-3, the present embodiment provides a soft soil foundation cast-in-place box girder support, taking the cast-in-place box girder of the 4 th joint of the overpass bridge in the country of jiangdi as an example, because the height of the pier of the project reaches 10m, the bridge site is located in the current situation salt field, the silt layer is deep, the geological condition is poor, the difficulty of foundation treatment is large, and the economic effect is poor, the project is not suitable for construction by adopting the full framing method, and a few-support system composed of steel pipe piles and beret girders is suitable for construction of the project. The bridge substructure of the engineering part is in a single-pile and single-column structure, steel pipe columns cannot be arranged on a bearing platform, and the support span arrangement also needs to consider the type of a support foundation. Therefore, the choice of which type of scaffold basis is the key to the less-scaffold system.
According to the geological conditions, the support foundation type can be generally concrete expanded foundation, driven pile foundation, drilled pile foundation and the like, the geological conditions of the project are poor, the thick sludge bottom layer is arranged along the line, the driven steel pipe pile foundation is generally adopted, the geological conditions are combined, the average soil penetration depth of the steel pipe piles is about 30m, the clearance of the bottom of the bridge is low, the steel pipe piles cannot be pulled out and recovered after the cast-in-place box girder is used, the construction cost is high, and the economical efficiency is poor.
Therefore, in order to ensure the construction quality and reduce the engineering cost, as shown in fig. 5, the project adopts a construction scheme of prestressed pipe piles and pile cap tie beams for the support outside the range of the bearing platform, the support foundation treatment is carried out by adopting prestressed pipe piles 10, the pile caps 8 are arranged on the pipe piles, and the pipe piles and the pipe pile support are connected into a whole through the tie beams 9, so that the stability of the whole is improved. And flange embedded parts are arranged in the pile cap 8 and the bearing platform, and the support steel pipe upright post 11 is reliably connected with the prestressed pipe pile 10 by adopting the flange embedded parts.
Specifically, the concrete structure from the top down of soft soil foundation cast-in-place box girder support includes in proper order:
a distribution beam: the transverse distribution beam comprises a transverse distribution beam 2 and a longitudinal distribution beam 1 arranged above the transverse distribution beam 2, wherein the transverse distribution beam 2 is made of 12.6I-steel, and the longitudinal bridge direction arrangement distance is 75 cm;
longitudinal beam: the support longitudinal beam adopts two rows or three rows of single-layer 321-type Bailey beams 5, adopts 90 and 45 flower stands, 21 Bailey sheets are arranged on the cross section, 75X 50X 6mm unequal angle steel is adopted among the Bailey beams 5 for transverse connection, the Bailey beams 5 are connected with the transverse distribution beams by U-shaped limiting plates, and the Bailey beams 5 are connected with the transverse bearing beams 6 by U-shaped limiting channel steel;
a beam: namely, the transverse bearing beam 6 is double-spliced 56b I-shaped steel, and the transverse bearing beam 6 and the steel pipe upright post 11 are welded and fixed by adopting a limiting steel plate;
unloading sand box 7: the sand box unloading device is used for unloading and dismantling the support, and ensures that the sand box is moderate in height and stable in placement in the construction process.
Steel pipe column 11: the pier is composed of steel columns 12, parallel connection 14 and inclined struts 13, wherein the steel columns 12 are 630-10 mm round steel pipes, the parallel connection 14 is 325-6 mm steel pipes, the inclined struts 13 are 245-6 mm steel pipes, and the steel pipe columns 11 on two sides of the pier body are all in horizontal connection with the parallel connection 14;
a support foundation: the steel pipe stand 11 most of support sets up on the cushion cap of bridge, and a small number can't set up the steel pipe stand 11 on the cushion cap, and the basis adopts 600 × 130mmAB type PHC stress tube stake 10, stress tube stake 10 top sets up pile cap 8, and steel pipe stand 11 is connected into a whole through pile cap 8 and stress tube stake 10.
After the support is installed, square timbers 4 and bamboo plywood 3 are installed above the distribution beam, and then cast-in-place box beam construction is carried out.
The cast-in-place box girder construction process flow is as follows: leveling field → driving a vibrating pile hammer into a prestressed pipe column → constructing a prestressed pipe pile cap tie beam → erecting a steel pipe upright column → installing an unloading sand box → installing a transverse bearing beam → installing a Bailey beam → installing a transverse distribution beam and a longitudinal distribution beam → installing a square timber and a bamboo plywood → constructing a cast-in-place box beam.
The construction process of the support foundation comprises the following steps: the cast-in-place box girder less-support system foundation is characterized in that steel pipe upright columns can form a commonly-supported stress system by means of a bearing platform in the range of the bearing platform, and during construction of the bearing platform, flange plate embedded parts are installed, the bearing platform is used as a steel pipe pile support foundation, and the bearing requirement of the cast-in-place box girder steel pipe pile support foundation is met.
Outside the range of a bearing platform, a D80 type diesel hammer pile driver is used for carrying out the pile sinking construction of the prestressed pipe pile 10, a pile driving heavy hook and a winch which are specially arranged on the pile driver are adopted to hoist and place in the construction process, the verticality of a pile body is checked by adopting a line weight or a guiding ruler, a steel end plate welding method is adopted for pile splicing, the top end of a pile is 0.5-1m higher than the ground in the pile splicing process, the top of a lower pile is cleaned before the pile splicing, a positioning plate is added, an upper pile is hung on the lower end plate, the upper pile and the lower pile are straightened by the positioning plate, and the welded pile joint can be continuously sunk after being naturally cooled. When the penetration degree meets the design requirement and the difference between the soil penetration depth of the pile and the calculated depth is not a few, the driving can be stopped; and when the penetration degree meets the design requirement and the difference between the penetration depth and the calculated depth is too large, stopping construction and carrying out research treatment. After the construction of the prestressed pipe pile 10 is completed, foundation pits of the pile caps 8 and the tie beams 9 are excavated, reinforcing steel bars of the pile caps 8 and the tie beams 9 are bound according to design requirements, and C30 concrete is poured through a formwork. The size of a pile cap 8 of the prestressed pipe pile 10 at the section is 90cm, the thickness is 80cm, the size of the cross section of a tie beam 9 is 60cm, the prestressed pipe pile 10 extends into the pile cap 8 by 10cm, a round thin steel plate with the thickness of 5mm is used as a tray at the lower part, a flange embedded part is arranged in the pile cap 8, and a support steel pipe column is reliably connected with the prestressed pipe column through the flange embedded part.
The steel tube upright post installation process comprises the following steps: and after the construction of the support foundation and the tying beam 9 of the pile cap 8 is finished, the accuracy of the center position of the foundation is rechecked after the concrete meets the design requirement, the top surface elevation of the foundation is measured, and the elevation error is calculated. The steel pipe upright post is respectively connected with the pile cap 8 and the flange pre-embedded in the bearing platform through the flange by bolts. And after the steel pipe stand column is installed, measurement and rechecking are carried out, and after the rechecking is qualified, horizontal and transverse connection is installed, so that the overall stability of the steel pipe stand column is improved.
The Bailey beam mounting process comprises the following steps: after the steel pipe upright post is installed, an unloading sand box 7 is installed at the top of the steel pipe upright post and used for unloading and dismantling the support, and the sand box is ensured to be moderate in height and stable in placement in the construction process. A double-spliced 56b I-steel transverse bearing beam 6 is arranged on the top of an unloading sand box 7, a Bailey beam 5 is arranged on the transverse bearing beam 6, the Bailey beam 5 is integrally hoisted after being spliced, 5 pieces of the Bailey beam are connected with one another by a flower stand, and 5 groups of the Bailey beam are connected with one another by an angle steel connection support, so that the integral stability of the Bailey beam 5 is ensured.
And finally, prepressing the support, namely, prepressing the support by adopting a concrete prepressing block to simulate the box girder concrete, wherein the weight of the prepressing block is 1.1 times of that of the reinforced concrete of the cast-in-situ box girder of the hole. Through the overall stability of pre-compaction inspection support and the actual bearing capacity on support basis, eliminate among the concrete placement process support and basis because the uneven settlement that inelastic deformation arouses, avoid the case roof beam concrete to appear the crack because of the uneven even settlement of support, collect the elastic deformation value of house, provide the basis for the construction founds the mould elevation. In the support pre-pressing process, besides the support is observed, the pile cap tie beam foundation at the bottom of the support needs to be observed in a key mode.
It will be understood by those skilled in the art that the scope of the present invention is not limited to the specific combination of the above-mentioned features, but also covers other embodiments formed by any combination of the above-mentioned features or their equivalents without departing from the spirit of the present invention. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (7)
1. A soft soil foundation cast-in-place box girder support is characterized by comprising a distribution girder, a longitudinal girder, a transverse bearing girder, a steel pipe upright post and a support foundation which are sequentially arranged from top to bottom; part of the steel pipe upright columns are arranged on a bearing platform of the bridge, and part of the steel pipe upright columns are arranged on the support foundation;
the support foundation is a prestressed pipe pile, a pile cap is arranged at the top of the prestressed pipe pile, and the steel pipe upright is connected with the prestressed pipe pile into a whole through the pile cap;
and the steel pipe upright post is respectively connected with the flange embedded parts in the pile cap and the flange embedded parts in the bearing platform through flanges.
2. A soft soil foundation cast-in-place box girder support according to claim 1, wherein the longitudinal beam is a beret beam.
3. A soft soil foundation cast-in-place box girder support according to claim 1, characterized in that an unloading sand box is provided between the steel pipe upright post and the transverse bearing beam.
4. A soft soil foundation cast-in-place box girder support according to claim 1, wherein the distribution beam comprises a transverse distribution beam and a longitudinal distribution beam disposed above the transverse distribution beam.
5. A soft soil foundation cast-in-place box girder support according to claim 1, wherein the steel pipe columns comprise steel columns, horizontal links and diagonal braces.
6. A soft soil foundation cast-in-place box girder support according to claim 1, wherein the transverse bearing beam is an i-beam.
7. A soft soil foundation cast-in-place box girder support as claimed in any one of claims 1 to 6, wherein a square timber is installed above the distribution beam, and a bamboo plywood is installed above the square timber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120179695.XU CN214459689U (en) | 2021-01-22 | 2021-01-22 | Cast-in-place box girder support of weak soil foundation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120179695.XU CN214459689U (en) | 2021-01-22 | 2021-01-22 | Cast-in-place box girder support of weak soil foundation |
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| CN214459689U true CN214459689U (en) | 2021-10-22 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114108496A (en) * | 2021-12-24 | 2022-03-01 | 宁波市政工程建设集团股份有限公司 | Method for casting cross-river channel variable-section cast-in-place box girder by using independent few supports |
| CN114717967A (en) * | 2022-05-07 | 2022-07-08 | 广州机施建设集团有限公司 | Steel case roof beam support frame |
-
2021
- 2021-01-22 CN CN202120179695.XU patent/CN214459689U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114108496A (en) * | 2021-12-24 | 2022-03-01 | 宁波市政工程建设集团股份有限公司 | Method for casting cross-river channel variable-section cast-in-place box girder by using independent few supports |
| CN114717967A (en) * | 2022-05-07 | 2022-07-08 | 广州机施建设集团有限公司 | Steel case roof beam support frame |
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