CN115110393A

CN115110393A - Stable steel temporary bridge and construction method thereof

Info

Publication number: CN115110393A
Application number: CN202210403048.1A
Authority: CN
Inventors: 马冰杰; 陈建南; 方杰; 袁臻
Original assignee: Zhejiang Zhonghuan Construction Co ltd
Current assignee: Zhejiang Zhonghuan Construction Co ltd
Priority date: 2022-04-18
Filing date: 2022-04-18
Publication date: 2022-09-27

Abstract

The application relates to the technical field of bridge construction, in particular to a stable steel temporary bridge, which comprises a bridge pier, wherein a supporting structure is arranged below the bridge pier; the supporting structure comprises a plurality of foundation piles and a base platform arranged above the foundation piles; the base platform is fixed on the foundation pile; the upper end surface of the base platform is flush with the surface of the riverbed; the pier is fixed at the upper end of the base station; a plurality of the base stations are distributed on the periphery of the base station; the bottom end area of the pier is smaller than the horizontal sectional area of the base. Compare in the fixed mode of mortar stock, bearing structure in this application can adapt to soft soil property, effectively guarantees the stability of steel temporary bridge. The application also relates to a construction method of the steel temporary bridge, the base platform applies downward pressure to the riverbed, under the action of the pressure, the soil of the riverbed can be more compact, the supporting performance of the riverbed can be improved, the compactness of combination of the foundation pile and the riverbed can be improved, the stability of the supporting structure is further ensured, and therefore the stability of the steel temporary bridge is effectively improved.

Description

Stable steel temporary bridge and construction method thereof

Technical Field

The application relates to the technical field of bridge construction, in particular to a stable steel temporary bridge and a construction method of the steel temporary bridge.

Background

The steel temporary bridge has the characteristics of simple structure, convenience in transportation, quickness in erection, large load capacity, good interchangeability and strong adaptability, and is widely applied to traffic engineering and municipal hydraulic engineering construction.

For a large-span steel temporary bridge, a pier is required to be built on a river bed, and the pier is usually of a steel structure or a reinforced concrete structure. Before the bridge pier is poured, a mortar anchor rod needs to be arranged on the river bed to ensure the stability of the bridge pier, so that the bridge pier is fixed on the river bed through the mortar anchor rod.

However, the inventors have found that the stabilising effect of mortar anchors on piers depends on the hardness and compactness of the river bed. For the rocky riverbed, the anchor rod can be stably fixed on the riverbed due to higher hardness and compactness, so that the stability of the pier is ensured. However, for a river bed with soft soil or a river bed with soft soil, the anchor rod is difficult to be stably fixed on the river bed, so that the mortar anchor rod is difficult to play a good stabilizing role on the bridge pier.

Therefore, for the above bridge pier, when it is applied to a soft river surface, the stability of the bridge pier is difficult to be effectively ensured, and the stability of the steel temporary bridge is seriously affected.

Disclosure of Invention

The application provides a stable steel temporary bridge and a construction method thereof, wherein the steel temporary bridge is suitable for a riverbed with soft soil and has high stability.

First aspect, the application provides a stabilize shaped steel temporary bridge adopts following technical scheme:

a stable steel temporary bridge comprises a bridge pier, wherein a supporting structure is arranged below the bridge pier; the supporting structure comprises a plurality of foundation piles and a base platform arranged above the foundation piles; the base station is fixed on the foundation pile; the upper end surface of the base platform is flush with the surface of a riverbed; the bridge pier is fixed at the upper end of the base; a plurality of the grooves are distributed on the periphery of the base station;

the bottom end area of the pier is smaller than the horizontal sectional area of the base.

Through adopting above-mentioned technical scheme, the foundation pile is located the riverbed below, has higher stability, therefore the base station has higher stability under the support of foundation pile. And because the upper end surface of the base station is flush with the surface of the riverbed, the whole supporting structure is positioned below the riverbed, so that the pier can be well supported, and the stability of the pier is ensured.

Compare in the fixed mode of mortar stock, bearing structure in this application can adapt to soft soil property, effectively guarantees the stability of steel temporary bridge.

Preferably, the base platform comprises a bearing plate and a support frame arranged at the bottom of the bearing plate; the foundation pile is connected with the supporting frame through the connecting component; the support frame inboard is provided with the dead slot.

Through adopting above-mentioned technical scheme, the carriage is when laying, because the setting of dead slot, the whole river bed soil that can imbed of support frame to promote the area of contact of base station and river bed. And the support frame can play limiting displacement to the loading board, makes the whole difficult production lateral slipping of base station to guarantee bearing structure's stability, and then promote the stability of steel temporary bridge.

Preferably, the support frame comprises a steel frame and a concrete body coated outside the steel frame; the steel frame is made of H-shaped steel.

Through adopting above-mentioned technical scheme, the setting of steelframe can effectively promote the toughness of support frame to promote the stability of support frame when receiving alternating load, and the concrete body can play the guard action to the support frame on the one hand, makes the steelframe be difficult for being corroded. On the other hand, because the material of the concrete body is the same with the material of foundation pile for the support frame is fixed on the foundation pile more easily, is convenient for promote bearing structure's stability.

Preferably, coupling assembling is including setting up the stopper on the foundation pile, set up on the concrete body with stopper joint complex spacing groove.

Through adopting above-mentioned technical scheme, through the cooperation of stopper and spacing groove, effectively promote the stability of being connected between support frame and the foundation pile.

Preferably, the connecting assembly further comprises a connecting rod fixed at the upper end of the foundation pile, the support frame is provided with a connecting hole in inserting fit with the connecting rod, and the connecting hole penetrates through the steel frame and the concrete body; the connecting rod is also provided with a fastener.

Through adopting above-mentioned technical scheme, the support frame can be fixed on the foundation pile through fastener and connecting rod, effectively promotes the wholeness of foundation pile and support frame, promotes bearing structure's stability on the one hand, and on the other hand, because coupling assembling's simple structure, the construction of consequently being convenient for helps shortening construction cycle.

Preferably, loading board, concrete body and pier integrated into one piece.

Through adopting above-mentioned technical scheme, loading board, concrete body and pier can integrative casting moulding, consequently can effectively guarantee the stability of pier.

On the other hand, the application provides a construction method of a steel temporary bridge, which comprises the following steps:

constructing a plurality of foundation piles; a plurality of foundation piles are annularly distributed; the upper end of the foundation pile is positioned at the lower side of the surface of the riverbed;

excavating a placing pit which is positioned on the inner sides of the plurality of foundation piles; the position of the pit bottom wall is not lower than the top end of the foundation pile;

the base platform and the bridge pier are both concrete prefabricated parts, and the base platform and the bridge pier are integrally cast and molded;

placing the base station in the placing pit; applying vertical pressure to the base platform to enable the base platform to be abutted against the upper end of the foundation pile and fix the base platform on the foundation pile;

and (5) erecting a bridge body of the steel temporary bridge.

Through adopting above-mentioned technical scheme, when the installation base platform, because the base station applys decurrent pressure to the riverbed, consequently, under the effect of this pressure, the soil property of riverbed can be compacter, can enough promote the support nature of riverbed, can promote the compactness that foundation pile and riverbed combine again, further guarantees bearing structure's stability to effectively promote the stability of steel temporary bridge.

Preferably, the foundation pile is a concrete jet grouting pile; the distance from the bottom end of the foundation pile to the surface of the river bed is not less than the distance from the surface of the river bed to the top of the pier, and the height of the foundation pile is not less than 0.5 time of the height of the pier.

By adopting the technical scheme, the foundation pile can be ensured to have enough length, so that the stability of the foundation pile is improved; the support effect of the support structure on the bridge pier is promoted, and therefore the stability of the bridge pier and the steel temporary bridge is promoted.

Preferably, a plurality of stable piles are driven; the stable piles are distributed annularly, and a plurality of foundation piles are all positioned on the inner sides of the stable piles; a transition plate is inserted between every two adjacent stable piles;

during construction, the transition plates are inserted at first, and then stable piles are driven between two adjacent transition plates; the stable pile is a concrete jet grouting pile.

Through adopting above-mentioned technical scheme, stabilize the stake and can play certain fixed action to the soil around the foundation pile, and cross cab apron and stabilize the stake cooperation, can effectively play firm effect to soil, can enough help promoting the closely knit degree of riverbed, can promote the stability of foundation pile again.

Preferably, the transition plate comprises a main plate, a plurality of auxiliary plates are arranged on two sides of the main plate, one side of each auxiliary plate is fixed on the main plate, and the auxiliary plates are arranged on one side, far away from the main plate, of the main plate at intervals.

Through adopting above-mentioned technical scheme, the concrete spouts the stake soon when the construction, the concrete can with subplate edge contact and combine with the subplate under the pressure of construction pump, when the concrete reaches design strength, cross the cab apron and can link as an organic wholely with crossing the cab apron to effectively promote the fixed effect to soil.

In summary, the invention includes at least one of the following beneficial technical effects:

1. the foundation pile is positioned below the riverbed and has higher stability, so the base platform has higher stability under the support of the foundation pile. The upper end surface of the base platform is flush with the surface of the riverbed, so that the supporting structure is integrally positioned below the riverbed, a better supporting effect can be achieved on the bridge pier, and the stability of the bridge pier is ensured;

2. when the base station and the bridge piers are installed, the riverbed soil is more compact under the action of the pressure of the base station and the bridge piers, so that the supporting property of the riverbed can be improved, the combining tightness of the foundation piles and the riverbed can be improved, the stability of a supporting structure is further ensured, and the stability of the steel temporary bridge is effectively improved;

3. when stabilizing the stake when construction, the concrete that stabilizes the stake and use can combine with crossing the cab apron, consequently, when stabilizing the stake and reaching design strength, cross the cab apron and can be connected with stabilizing the stake to form solid soil around bearing structure and enclose the fender, can enough promote the firm of bearing structure surrounding soil matter, promote bearing structure's stability, can play the effect that reduces soil erosion and water loss again. Simultaneously, when the base station exerted pressure to soil, cross cab apron and stable pile can also prevent to block the horizontal expansion of soil to in the closely knit of base station to soil.

Drawings

FIG. 1 is a schematic structural diagram of a steel temporary bridge in the embodiment of the application;

fig. 2 is a structural schematic view of a pier and a support structure;

FIG. 3 is an exploded view of the support structure;

FIG. 4 is a cross-sectional view of the support bracket;

FIG. 5 is an enlarged partial schematic view of portion A of FIG. 3;

fig. 6 is a schematic view of the structure of the stabilizer plate.

In the drawings, the reference numbers: 1. a support structure; 2. foundation piles; 3. a base station; 4. a support frame; 5. a steel frame; 6. a concrete body; 7. a bridge pier; 8. a connecting assembly; 9. a limiting block; 10. a connecting rod; 11. a bolt; 12. connecting holes; 13. a carrier plate; 14. a bridge body; 15. a transition plate; 16. a main board; 17. a sub-plate.

Detailed Description

The present invention is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses a stable shaped steel temporary bridge. Referring to fig. 1, stabilize shaped steel temporary bridge and include bearing structure 1, pier 7 and set up the pontic 14 on pier 7, bearing structure 1 can provide the stable support to pier 7 to guarantee the stability of pontic 14, and then promote the steadiness of steel temporary bridge.

Referring to fig. 2 and 3, the support structure 1 includes a plurality of foundation piles 2, and the foundation piles 2 are concrete shotcrete piles. When the foundation pile 2 is constructed, the top end of the foundation pile 2 is ensured to be lower than the surface of the riverbed. As a preferable scheme of the embodiment of the application, the length of the bridge body 14 is 1200cm, four foundation piles 2 are arranged, and the four foundation piles 2 are respectively positioned at four corners of a rectangle with the length of 600cm and the width of 150 cm.

Referring to fig. 3 and 4, the support structure 1 further includes a foundation 3 disposed above the foundation pile 2. The base 3 includes a square frame-shaped support frame 4, and a hollow groove is formed inside the support frame 4. The support frame 4 comprises a steel frame 5 and a concrete body 6 coated outside the steel frame 5. The steel frame 5 is made of H-shaped steel, and the concrete body 6 is formed by pouring a template.

Referring to fig. 3, the four corners of support frame 4 and four foundation piles 2 one-to-one to support frame 4 passes through coupling assembling 8 to be fixed on foundation pile 2, and coupling assembling 8 is including setting up stopper 9 in foundation pile 2 upper end and setting up connecting rod 10 in foundation pile 2 upper end, stopper 9 and foundation pile 2 integrated into one piece. The bottom of the concrete body 6 is provided with a limiting groove matched with the limiting block 9 in a clamping manner, and the limiting block 9 is matched with the limiting groove, so that the stability of connection between the foundation pile 2 and the base station 3 is improved.

Referring to fig. 3 and 5, the connecting rod 10 is vertically arranged on one side of the limiting block 9, the lower end of the connecting rod 10 is fixed on the foundation pile 2 in a 'bar planting' mode, and the upper end of the connecting rod 10 extends to the position above the supporting frame 4. The support frame 4 is provided with a connecting hole 12, the connecting hole 12 penetrates through the steel frame 5 and the concrete body 6, and the connecting rod 10 can penetrate through the connecting hole 12. The upper end of connecting rod 10 extends to the top of support frame 4 and sets up to the screw thread section, and screw-thread fit's bolt 11 on connecting rod 10 is through the cooperation of bolt 11 with the screw thread section to fix support frame 4 on foundation pile 2.

Referring to fig. 2 and 3, the base 3 further includes a bearing plate 13 disposed on the support frame 4, the bearing plate 13 is made of reinforced concrete, and the bearing plate 13 is cast on the support frame 4 and is integrally formed with the support frame 4. When the bearing plate 13 is poured, a space needs to be reserved at the position of the connecting hole 12 for the connecting rod 10 to pass through the connecting hole 12, so that the base 3 is integrally installed on the foundation pile 2.

Pier 7 is located above bearing plate 13. After the abutment 3 is fixed to the foundation pile 2, the pier 7 may be integrally cast on the bearing plate 13, so that the pier 7 and the abutment 3 are integrally connected. In order to enhance the connection strength between the abutment 3 and the pier 7, when the bearing plate 13 is poured, the bearing plate 13 needs to be provided with steel bars, so that the pier 7 can be tightly connected with the bearing plate 13 through the steel bars when the pier 7 is poured.

As another embodiment of the present invention, the pier 7 may be integrally cast with the bearing plate 13 and the concrete body 6, so as to further ensure the integrity of the abutment 3 and the pier 7. And the base 3 and the piers 7 are prefabricated components, which is beneficial to improving the construction speed of the steel temporary bridge.

Pier 7 is the quadrangular frustum pyramid form, and the area of pier 7 bottom is less than the horizontal sectional area of base station 3, can enough guarantee the support effect of base station 3 to pier 7, can reduce the weight and the material use amount of pier 7 again, helps promoting the construction speed and reduces construction cost.

The application also discloses a construction method of the steel temporary bridge, which comprises the following steps:

1. and (6) cofferdam and measurement. In the embodiment of the application, the length of the bridge 14 is 1200cm, and a rectangular construction position with the length of 600cm and the width of 150cm is positioned at the preset position of the pier 7. The length and width of the rectangular construction position can be modified and adjusted according to actual construction standards.

2. And inserting the stabilizing plate 15 and driving a stabilizing pile. A plurality of stabilizing plates 15 are inserted on the peripheral side of the construction position, and two adjacent stabilizing plates 15 are arranged at intervals. And a stabilizing pile is driven between two adjacent stabilizing plates 15, and the stabilizing pile adopts a concrete jet grouting pile,

the stabilizing plate 15 is made of precast concrete plate, and can also be made of stainless steel plate. The stabilizer plate 15 includes a main plate 16, and a plurality of sub-plates 17 that are parallel to each other are provided on both vertical sides of the main plate 16, and the sub-plates 17 and the main plate 16 are integrally formed. One side of the plurality of auxiliary boards 17 in the same direction is connected with the main board 16, and the other side is arranged at intervals.

The diameter of the stabilization piles is the same as the distance between two adjacent stabilization plates. Therefore, when the stabilization pile is formed, concrete is diffused between the sub-plates 17, and when the stabilization pile reaches the designed strength, the stabilization plates 15 are integrated with the stabilization pile.

3. And constructing a foundation pile 2 at the four corners of the rectangle. The foundation pile 2 is a concrete jet grouting pile. And the upper end of the foundation pile 2 is ensured to be positioned below the surface of the riverbed, so that a margin is left between the upper end of the foundation pile 2 and the surface of the riverbed.

4. Excavating a placing pit by taking the length and the width of a rectangle as references, namely the length of the placing pit is 600cm, and the width of the placing pit is 150 cm; and the bottom of the placing pit is not lower than the top end of the foundation pile 2.

5. Base station 3 and pier 7 are the concrete precast element in this application embodiment to base station 3 and pier 7 integrated into one piece pour the shaping.

Place base station 3 in placing the hole to apply vertical pressure to base station 3, under this pressure effect, the riverbed soil can become compact, thereby promotes bearing structure 1's stability.

Abutting the base 3 to the upper end of the foundation pile 2, and fixing the base 3 to the foundation pile 2;

the distance from the bottom end of the foundation pile 2 to the bed surface is not less than the distance from the bed surface to the top of the pier 7, and the height of the foundation pile 2 is not less than 0.5 times the height of the pier 7.

5. After the bridge pier 7 is built, the bridge body 14 of the steel temporary bridge can be built on the bridge pier 7, and therefore the construction of the steel temporary bridge is completed.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. The utility model provides a stabilize shaped steel temporary bridge, includes pier (7), its characterized in that: a supporting structure (1) is arranged below the pier (7); the supporting structure (1) comprises a plurality of foundation piles (2) and a base platform (3) arranged above the foundation piles (2); the upper end surface of the base platform (3) is flush with the surface of a riverbed; the base platform (3) is fixed on the foundation pile (2); the pier (7) is fixed at the upper end of the base station (3); a plurality of the grooves are distributed on the periphery of the base station (3);

the bottom end area of the pier (7) is smaller than the horizontal sectional area of the base (3).

2. The stabilized steel access bridge of claim 1, wherein: the base platform (3) comprises a bearing plate (13) and a support frame (4) arranged at the bottom of the bearing plate (13); the foundation pile (2) is connected with the support frame (4) through a connecting assembly (8); the inner side of the support frame (4) is provided with a hollow groove.

3. The stabilized steel access bridge of claim 2, wherein: the support frame (4) comprises a steel frame (5) and a concrete body (6) coated on the outer side of the steel frame (5); the steel frame (5) is made of H-shaped steel.

4. The stabilized steel access bridge of claim 3, wherein: coupling assembling (8) are including setting up stopper (9) on foundation pile (2), concrete body (6) are last to have seted up with stopper (9) joint complex spacing groove.

5. The stabilized steel access bridge of claim 3, wherein: the connecting assembly (8) further comprises a connecting rod (10) fixed at the upper end of the foundation pile (2), a connecting hole (12) in inserting fit with the connecting rod (10) is formed in the supporting frame (4), and the connecting hole (12) penetrates through the steel frame (5) and the concrete body (6); the connecting rod (10) is also provided with a fastener.

6. The stabilized steel temporary bridge as defined in claim 3, wherein: the bearing plate (13), the concrete body (6) and the bridge pier (7) are integrally formed.

7. A construction method applied to the stable steel temporary bridge of any one of claims 1 to 6, which is characterized by comprising the following steps:

driving a plurality of foundation piles (2); the plurality of foundation piles (2) are distributed annularly; the upper end of the foundation pile (2) is positioned at the lower side of the surface of the riverbed;

excavating a placing pit which is positioned at the inner sides of the plurality of foundation piles (2); the bottom wall of the placing pit is not lower than the top end of the foundation pile (2);

the base platform (3) and the bridge pier (7) are both made of concrete prefabricated parts, and the base platform (3) and the bridge pier (7) are integrally cast and molded;

placing the base platform (3) in the placing pit; applying vertical pressure to the base platform (3), enabling the base platform (3) to be abutted against the upper end of the foundation pile (2), and fixing the base platform (3) on the foundation pile (2);

a bridge body (14) of a steel temporary bridge is built.

8. The construction method of the steel temporary bridge according to the claim 7, characterized in that the foundation pile (2) adopts a concrete jet grouting pile; the distance from the bottom end of the foundation pile (2) to the riverbed surface is not less than the distance from the riverbed surface to the top of the pier (7), and the height of the foundation pile (2) is not less than 0.5 time of the height of the pier (7).

9. The construction method of the steel temporary bridge according to claim 7, wherein a plurality of stabilizing piles are driven; the stable piles are distributed annularly, and a plurality of foundation piles are all positioned on the inner sides of the stable piles; a stabilizing plate (15) is inserted between every two adjacent stabilizing piles;

during construction, the stabilizing plates (15) are inserted at first, and then stabilizing piles are constructed between two adjacent stabilizing plates (15); the stable pile is a concrete jet grouting pile.

10. The construction method of the steel access bridge according to claim 9, wherein the stabilizing plate (15) comprises a main plate (16), a plurality of secondary plates are arranged on two sides of the main plate (16), one sides of the secondary plates are fixed on the main plate (16), and one sides of the secondary plates, which are far away from the main plate (16), are arranged at intervals.