CN215359064U - Pedestal of highway prestressed small box girder under soft foundation geological condition - Google Patents
Pedestal of highway prestressed small box girder under soft foundation geological condition Download PDFInfo
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- CN215359064U CN215359064U CN202121462620.9U CN202121462620U CN215359064U CN 215359064 U CN215359064 U CN 215359064U CN 202121462620 U CN202121462620 U CN 202121462620U CN 215359064 U CN215359064 U CN 215359064U
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Abstract
The utility model relates to a pedestal of highway prestressing force little case roof beam under soft basic geological conditions relates to the technical field of bridge construction, and it includes through the firming layer that rolls the ramming, is provided with concrete bearing portion on the firming layer, fixedly connected with steel construction pedestal on the concrete bearing portion. This application carries out the compaction with the soil of soft basic geology department earlier and makes it form the soil layer, reduces the probability that soil compression deformation sinks, later pours the concrete on the soil layer and makes the concrete form concrete bearing portion, and the atress of steel construction pedestal can be dispersed to the concrete bearing portion, reduces the probability that soil local sinks, has improved steel construction pedestal upper surface levelness, has improved the mechanical properties after the box girder shaping.
Description
Technical Field
The application relates to the field of bridge construction, in particular to a pedestal of a prestressed small box girder of a highway under a soft foundation geological condition.
Background
The box girder is one of the girders in bridge engineering, and can be made of steel structures or reinforced concrete. The reinforced concrete box girder is generally divided into two types, one is a prefabricated box girder and the other is a cast-in-place box girder. The precast box girder means that the box girder is precast and molded near a bridge construction site, and after lower works such as a pier are completed, the precast box girder can be erected on the pier by using a bridge erecting machine, so that the progress of the works can be accelerated, and the construction period can be saved.
The pedestal is a foundation platform for pouring the prefabricated box girder, and is required to support the whole weight of the prefabricated box girder and ensure that the prefabricated box girder is in a horizontal position in the forming process, so that the box girder has uniform mechanical strength after being formed. Soft-based geology, in turn, refers to a geological environment formed by loose sediments that have not consolidated to rock, and which is formed mostly by hard rock undergoing weathering damage, handling, and deposition.
In view of the above-mentioned related technologies, the inventor believes that when the soft geology is subjected to a large pressure, the soft geology is easy to deform and loosen, so that the levelness of the whole pedestal is difficult to control, and the mechanical properties of the box girder after forming are affected.
SUMMERY OF THE UTILITY MODEL
In order to improve the levelness of the pedestal of building on soft foundation geology, this application provides a pedestal of highway prestressing force small box girder under soft foundation geological conditions.
The application provides a pedestal of highway prestressing force small box roof beam under soft basic geological conditions adopts following technical scheme:
the pedestal of the highway prestressed small box girder under the soft foundation geological condition comprises a soil compaction layer compacted by rolling, wherein a concrete bearing part is arranged on the soil compaction layer, and a steel structure pedestal is fixedly connected onto the concrete bearing part.
Through adopting above-mentioned technical scheme, carry out the compaction with the soil of soft basic geology department earlier and make it form the soil layer, reduce the probability that soil compression deformation sinks, later pour the concrete on the soil layer and make the concrete form concrete bearing portion, later fix the steel structure pedestal on concrete bearing portion, the atress of steel structure pedestal can be dispersed to concrete bearing portion, reduce the probability that soil local sinks, improved steel structure pedestal upper surface levelness, improved the mechanical properties after the case roof beam shaping.
Optionally, the concrete pressure-bearing portion includes cylinder and cushion cap, the cylinder inlays to be established in the soil compaction layer, the cushion cap is fixed to be set up the upper portion of cylinder, steel construction pedestal fixed connection is on the cushion cap.
Through adopting above-mentioned technical scheme, in the cylinder embedding firming layer for the support of all pressurized soil layers all around of cylinder has reduced the probability that the cushion cap takes place the local settlement under the supporting role of cylinder, has improved steel construction pedestal upper surface levelness.
Optionally, the width of the steel structure base body is larger than that of the bearing platform, the bearing platform is also embedded in the soil compaction layer, and two ends of the steel structure base body in the width direction are connected with the soil compaction layer.
Through adopting above-mentioned technical scheme, the steel construction pedestal mainly supports by concrete pressure-bearing portion, and steel construction pedestal width direction's both ends extend to the top on firming layer, and the both sides of firming layer width direction support the steel construction pedestal, so under the prerequisite that does not reduce the stability that the steel construction pedestal is supported, reduced the quantity of concrete.
Optionally, the soil compacting layer is arranged below the ground, so that a placing groove is formed between the soil compacting layer and the ground, and the steel structure base is arranged in the placing groove.
By adopting the technical scheme, the upper part of the soil compaction layer is not directly contacted with the atmosphere, so that the soil compaction layer is not easily influenced by external climate, the probability of water absorption collapse or expansion of the soil compaction layer is reduced, the supported stability of the steel structure base is improved, and the surface levelness of the steel structure base is improved.
Optionally, the steel structure base body comprises a lower half body and an upper half body, the lower half body is fixedly connected to the concrete bearing portion, and the upper half body is connected to the lower half body through a leveling mechanism.
By adopting the technical scheme, after the lower half body is arranged on the concrete bearing part, the leveling mechanism is used for leveling the upper half body, so that the construction error during construction is neutralized, and the levelness of the upper surface of the upper half body is further improved.
Optionally, the number of the leveling mechanisms is four, the four leveling mechanisms are arranged at four corners of the upper half body, each leveling mechanism comprises a leveling plate, a leveling lead screw and a leveling nut, one end of each leveling lead screw is fixedly connected to the leveling plate, the other end of each leveling lead screw penetrates through the lower half body, the leveling nuts are in threaded connection with the leveling lead screws, the leveling nuts are abutted against the lower half body, and the bottom surface of the upper half body is connected with the leveling plates.
By adopting the technical scheme, the distance between the leveling plates and the lower half body can be adjusted by rotating the leveling nuts, then the included angle between the upper half body and the lower half body is adjusted through the change of the distance between each leveling plate and the lower half body, and when the included angle exists between the upper surface of the lower half body and the horizontal plane, the levelness of the upper surface of the upper half body can be improved by adjusting the leveling nuts.
Optionally, one leveling plate is correspondingly provided with a plurality of leveling lead screws and leveling nuts.
By adopting the technical scheme, the leveling plate is not easy to drive to rotate when the leveling nut is rotated by an operator, so that the operator can adjust the distance between the leveling plate and the upper surface of the lower half body, and further adjust the levelness of the upper surface of the upper half body.
Optionally, the leveling mechanism further includes a connecting plate, the connecting plate is fixedly connected to the lower surface of the upper half body, the upper surface of the leveling plate is arranged in a spherical surface manner, a ball groove is formed in the lower surface of the connecting plate, and the leveling plate is clamped in the ball groove.
By adopting the technical scheme, when the levelness of the upper surface of the upper half body is leveled, the leveling plate can be in closer contact with the connecting plate, so that the stability of the supported upper half body is improved, meanwhile, the upper half body is not easy to move relative to the lower half body on the horizontal plane, and the positioning precision of the upper half body is improved.
Optionally, the upper half body is provided with a plurality of upper half bodies along the length direction of the lower half body.
By adopting the technical scheme, each upper half body is supported by the four leveling mechanisms, the length of the upper half body is reduced, the bending moment borne by the upper half body can be reduced, and the levelness of the upper surface of the upper half body is further improved.
Optionally, the upper surface of the lower half body is not lower than the ground.
Through adopting above-mentioned technical scheme, the operating personnel of being convenient for rotates adjusting nut, and then the levelness of the operating personnel adjustment upper half body upper surface of being convenient for.
In summary, the present application includes at least one of the following beneficial technical effects:
1. through the setting on compressed soil layer, reduced the probability that soil compression deformation sinks, through the setting of concrete bearing portion, reduced the probability that soil part sinks, improved steel construction pedestal upper surface levelness, and then improved the mechanical properties after the box girder shaping.
2. Through setting up the layer of calming the anger in the below on ground, the upper portion on layer of calming the anger is not direct and atmospheric contact, and the layer of calming the anger that makes is difficult for receiving outside weather to influence, has reduced the probability that the layer of calming the anger collapses or expands that absorbs water, has improved the stability that steel construction pedestal was supported, has improved steel construction pedestal upper surface levelness.
3. Through the arrangement of the leveling mechanism, after the lower half body is installed on the concrete bearing part, the upper half body is leveled through the leveling mechanism, so that construction errors during construction are neutralized, and the levelness of the upper surface of the upper half body is further improved.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present application;
FIG. 2 is an exploded view of an embodiment of the leveling mechanism of the present application;
fig. 3 is a schematic overall structure diagram of a connection plate according to an embodiment of the present application.
Description of reference numerals: 100. pressing a soil layer; 110. a placement groove; 200. a concrete bearing portion; 210. a cylinder; 220. a bearing platform; 300. a steel structure base body; 310. a lower half body; 320. an upper half body; 330. a leveling mechanism; 331. leveling; 332. leveling a lead screw; 333. a leveling nut; 334. a connecting plate; 335. a ball groove.
Detailed Description
The present application is described in further detail below with reference to figures 1-3.
The embodiment of the application provides a pedestal of a small prestressed box girder of a highway under a soft foundation geological condition. Referring to fig. 1, the pedestal of the highway prestressed small box girder under the soft foundation geological condition comprises a compacted soil layer 100 subjected to rolling compaction, a concrete bearing part 200 poured in the compacted soil layer 100 and a steel structure base 300 arranged on the concrete bearing part 200, wherein the steel structure base 300 comprises a lower half body 310 connected to the concrete bearing part 200 and an upper half body 320 used for supporting the box girder, and the upper half body 320 and the lower half body 310 are connected through a leveling mechanism 330.
The soil in the soft foundation geology is compacted to form the soil compaction layer 100, the probability of soil overall compression collapse is further reduced, then concrete is poured into the soil compaction layer 100 to form the concrete bearing portion 200, the stress of the steel structure base body 300 is dispersed, the probability of soil local collapse is reduced, the stability of the steel structure base body 300 is further improved, then the upper half body 320 is adjusted through the leveling mechanism 330, the levelness of the upper surface of the upper half body 320 is improved, and finally the mechanical performance of the box girder after forming is improved.
Referring to fig. 1, the concrete bearing portion 200 includes a bearing platform 220 and a plurality of columns 210, and the bearing platform 220 and the columns 210 are embedded in the bearing layer 100. The bearing platform 220 and the columns 210 are formed by one-time pouring, and the columns 210 are arranged at the lower part of the bearing platform 220 and are uniformly distributed along the length direction of the bearing platform 220. Under the supporting action of the column 210, the bearing platform 220 is not easy to displace along the radial direction of the column 210, and the stability of the concrete bearing part 200 is further improved.
Referring to fig. 1, an embedded part is embedded in an upper surface of a bearing platform 220, and a lower half body 310 is connected to the embedded part through an anchor bolt, so that the lower half body 310 is fixed to the bearing platform 220. The width of the bearing platform 220 is smaller than that of the soil compacting layer 100, the bearing platform 220 is arranged in the middle of the soil compacting layer 100, and the width of the lower half body 310 is the same as that of the soil compacting layer 100. After the lower half body 310 is fixed on the bearing platform 220, the two ends of the lower half body 310 in the width direction can be supported by the soil layer 100, the weight of the lower half body 310 is mainly supported by the concrete bearing part 200, and the soil pressing layer 100 only plays a role in auxiliary support, so that the using amount of concrete is reduced and resources are saved on the premise of not influencing the supported stability of the steel structure base body 300.
Referring to fig. 1, the soft foundation geology is easy to absorb water and easily swells and disintegrates after absorbing water, and in order to reduce the influence of the weather on the compacted soil layer 100, the compacted soil layer 100 is disposed under the ground such that the placement groove 110 is formed between the compacted soil layer 100 and the ground, and the lower half body 310 is placed in the placement groove 110. Therefore, the soil compacting layer 100 is not easily eroded by rainwater, the probability of expansion or disintegration of the soil compacting layer 100 is reduced, and the stability of the lower half body 310 being supported is improved.
Referring to fig. 2 and 3, the leveling mechanisms 330 are respectively disposed at four corners of the upper half body 320, each leveling mechanism 330 includes a leveling plate 331, a leveling screw 332, a leveling nut 333, and a connecting plate 334, the leveling plate 331 is welded at one end of the leveling screw 332, the leveling nut 333 is screwed to the leveling screw 332, the other end of the leveling screw 332 is inserted into the lower half body 310, the leveling nut 333 is abutted to the upper surface of the lower half body 310, and when the leveling nut 333 is rotated, the leveling screw 332 can slide relative to the lower half body 310 along the axial direction thereof.
Referring to fig. 2 and 3, in order to prevent the leveling screws 332 from rotating synchronously with the leveling nuts 333 when the leveling nuts 333 are rotated, a plurality of leveling screws 332 and a plurality of leveling nuts 333 are provided, in the embodiment of the present application, four leveling screws 332 and four leveling nuts 333 are provided, one leveling nut 333 is correspondingly screwed to one leveling screw 332, and the four leveling screws 332 are respectively provided at four corners of the leveling plate 331. Web 334 is welded to the lower surface of upper half 320 such that web 334 abuts leveling plate 331 when upper half 320 is placed on lower half 310.
When the levelness of the upper surface of the upper half body 320 needs to be adjusted, the leveling mechanisms 330 at the four corners of the upper half body 320 are respectively adjusted to change the distance between the leveling plate 331 and the upper surface of the lower half body 310, so that the included angle between the upper half body 320 and the lower half body 310 can be adjusted, and the levelness of the upper surface of the upper half body 320 is further adjusted. In order to facilitate the adjustment of the leveling mechanism 330 by the operator, the thickness of the lower half 310 is not less than the depth of the placing groove 110, so that the upper surface of the lower half 310 is not lower than the ground, which facilitates the operator to rotate the leveling nut 333 and further adjust the leveling mechanism 330.
Referring to fig. 2 and 3, when the levelness of the upper surface of the upper half 320 is adjusted, an included angle between the leveling plate 331 and the connecting plate 334 is also changed, so that the leveling plate 331 is easily deformed, thereby reducing the stability of the upper half 320. In order to reduce the deformation probability of the leveling plate 331, the upper surface of the leveling plate 331 is arranged in a spherical surface, the lower surface of the connecting plate 334 is provided with a ball groove 335, and the leveling plate 331 is clamped in the ball groove 335. Thus, when the levelness of the upper surface of the upper half body 320 is leveled, the upper surface of the leveling plate 331 is always in contact with the surface of the ball groove 335, the probability that the stress of the leveling plate 331 is uneven is reduced, and the stability of the upper half body 320 being supported is improved; meanwhile, due to the arrangement of the ball groove 335, the upper half body 320 is not easy to move relative to the lower half body 310 on the horizontal plane, and the positioning accuracy of the upper half body 320 is improved.
Referring to fig. 1 and 2, since the upper half 320 is connected to the lower half 310 through the leveling mechanisms 330 at the four corners, the middle of the upper half 320 is suspended, when a box girder is placed on the upper half 320, the bending moment applied to the upper half 320 is large, and the box girder is easily bent and deformed. In order to reduce the bending moment applied to the upper half body 320 and reduce the probability of the upper half body 320 being bent and deformed, the upper half body 320 is uniformly distributed on the lower half body 310 in the length direction, and two adjacent upper half bodies 320 are mutually abutted, so that the bending moment applied to a single upper half body 320 is reduced under the condition of not influencing the bearing box girder, the probability of the upper half body 320 being bent and deformed is further reduced, and the levelness of the upper surface of the upper half body 320 is improved
The implementation principle of the pedestal of the highway prestressed small box girder under the soft foundation geological condition is as follows:
through carrying out the compaction with soft basic geology and forming soil compacting layer 100 to reduce the probability that soil takes place overall settlement, later pour cylinder 210 and cushion cap 220 in soil compacting layer 100, the pressure of dispersion steel structure pedestal 300 makes the difficult local settlement that takes place of soil, and then has improved steel structure pedestal 300's stability on the whole, has reduced the probability that steel structure pedestal 300 is low because of the upper surface levelness that subsides and lead to. And the upper half body 320 and the lower half body 310 of the steel structure base 300 are connected by the leveling mechanism 330, and when there is a construction error in the compacted soil layer 100 and the concrete bearing part 200, the leveling mechanism 330 can adjust the upper half body 320 to neutralize the error during construction, thereby improving the levelness of the upper surface of the upper half body 320. Because the upper surface levelness of the upper half body 320 of this application is high, and be difficult for reducing the levelness of the upper surface of the upper half body 320 because of the external reason, can make the case roof beam atress more even when prefabricating the case roof beam, and then improved the mechanical properties after the case roof beam shaping.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. The pedestal of the highway prestressed small box girder under the soft foundation geological condition is characterized by comprising a compaction layer (100) which is compacted by rolling, wherein a concrete bearing part (200) is arranged on the compaction layer (100), and a steel structure pedestal (300) is fixedly connected onto the concrete bearing part (200).
2. The pedestal of the prestressed small box girder for the expressway under the soft foundation geological condition as recited in claim 1, wherein: the concrete bearing part (200) comprises a column body (210) and a bearing platform (220), the column body (210) is embedded in the bearing soil layer (100), the bearing platform (220) is fixedly arranged on the upper portion of the column body (210), and the steel structure base body (300) is fixedly connected to the bearing platform (220).
3. The pedestal of the prestressed small box girder for the expressway under the soft foundation geological condition as recited in claim 2, wherein: the width of steel construction pedestal (300) is greater than the width of cushion cap (220), cushion cap (220) also inlay and establish in soil compacting layer (100), the both ends of steel construction pedestal (300) width direction with soil compacting layer (100) are connected.
4. The pedestal of the prestressed small box girder for expressway under soft foundation geological conditions, according to claim 3, wherein: the soil compacting layer (100) is arranged below the ground, a placing groove (110) is formed between the soil compacting layer (100) and the ground, and the steel structure base body (300) is arranged in the placing groove (110).
5. A platform of a pre-stressed small box girder for a highway according to any one of claims 1 to 4, wherein the platform comprises: the steel structure base body (300) comprises a lower half body (310) and an upper half body (320), the lower half body (310) is fixedly connected to the concrete bearing portion (200), and the upper half body (320) is connected to the lower half body (310) through a leveling mechanism (330).
6. The pedestal of the prestressed small box girder for expressway under soft foundation geological conditions, according to claim 5, wherein: the four leveling mechanisms (330) are arranged at four corners of the upper half body (320), each leveling mechanism (330) comprises a leveling plate (331), a leveling lead screw (332) and a leveling nut (333), one end of each leveling lead screw (332) is fixedly connected to the leveling plate (331), the other end of each leveling lead screw penetrates through the lower half body (310), the leveling nuts (333) are in threaded connection with the leveling lead screws (332), the leveling nuts (333) are abutted to the lower half body (310), and the bottom surface of the upper half body (320) is connected with the leveling plates (331).
7. The pedestal of the prestressed small box girder for expressway under soft foundation geological conditions, according to claim 6, wherein: the leveling plate (331) is correspondingly provided with a plurality of leveling lead screws (332) and leveling nuts (333).
8. The pedestal of the prestressed small box girder for expressway under soft foundation geological conditions, according to claim 6, wherein: the leveling mechanism (330) further comprises a connecting plate (334), the connecting plate (334) is fixedly connected to the lower surface of the upper half body (320), the upper surface of the leveling plate (331) is arranged in a spherical surface mode, a ball groove (335) is formed in the lower surface of the connecting plate (334), and the leveling plate (331) is clamped in the ball groove (335).
9. The pedestal of the prestressed small box girder for expressway under soft foundation geological conditions, according to claim 6, wherein: the upper half body (320) is provided in plurality along the longitudinal direction of the lower half body (310).
10. The pedestal of the prestressed small box girder for expressway under soft foundation geological conditions, according to claim 6, wherein: the upper surface of the lower half body (310) is not lower than the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121462620.9U CN215359064U (en) | 2021-06-29 | 2021-06-29 | Pedestal of highway prestressed small box girder under soft foundation geological condition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121462620.9U CN215359064U (en) | 2021-06-29 | 2021-06-29 | Pedestal of highway prestressed small box girder under soft foundation geological condition |
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| Publication Number | Publication Date |
|---|---|
| CN215359064U true CN215359064U (en) | 2021-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121462620.9U Active CN215359064U (en) | 2021-06-29 | 2021-06-29 | Pedestal of highway prestressed small box girder under soft foundation geological condition |
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| CN (1) | CN215359064U (en) |
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2021
- 2021-06-29 CN CN202121462620.9U patent/CN215359064U/en active Active
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Address after: Room 1815, 14677 Jingshi Road, Lixia District, Jinan City, Shandong Province Patentee after: Shandong highway and Bridge Construction Group Co.,Ltd. Address before: Room 1815, 14677 Jingshi Road, Lixia District, Jinan City, Shandong Province Patentee before: SHANDONG HIGHWAY & BRIDGE CONSTRUCTION Co.,Ltd. |
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