Steel-concrete combined temporary bridge suitable for marine environment

Abstract

The present application relates to a kind of steel-concrete composite temporary bridge suitable for marine environment, including temporary bridge foundation and bridge deck, the temporary bridge foundation includes two rows of steel pipe piles arranged in the direction of bridge, and a load-bearing beam is erected on the top of every two steel pipe piles in the transverse direction of bridge, the bridge deck adopts simply supported beam erection form, and each span bridge deck includes at least two concrete precast beams, the bottom of each precast beam is arched, and the bottom surface of both ends of each precast beam is supported on two load-bearing beams respectively, at least two tenons integrally cast with precast beam are arranged at both ends of each precast beam respectively, there is mortise with width equal to or greater than the thickness of tenon between two adjacent tenons, and the end of precast beam of adjacent two span bridge deck is mutually embedded by tenon and mortise.The bridge deck of the present application can effectively resist the corrosion of marine environment, has long service life, strong bearing capacity, and low manufacturing and maintenance cost.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of bridge construction technology, and relates to a temporary bridge structure erected during the construction of a bridge in water, in particular to a steel-concrete combined temporary bridge suitable for marine environment. BACKGROUND

[0002] During the construction of a bridge in water, a temporary bridge is often needed to be erected in water as a channel for the transportation of construction materials and equipment and personnel walking. The temporary bridge usually adopts an assembled steel structure, including a foundation structure and a bridge deck system. The foundation structure adopts steel pipe piles, and a load-bearing beam is erected on every two steel pipe piles in the transverse direction of the bridge. The bridge deck system adopts a main beam composed of longitudinal bailey or profile steel, a distribution beam transversely laid on the main beam, and a patterned steel bridge deck plate laid on the distribution beam.

[0003] In the inland river environment, most of the materials of the steel structure temporary bridge can be disassembled and reused after the construction is completed. However, in the marine environment, due to the high corrosion characteristics of seawater, the components such as steel pipes, bailey, distribution beams and deck plates will be severely corroded, and regular maintenance and inspection are needed during use. In addition, it is difficult to accurately assess the exact mechanical reduction coefficient of the temporary bridge components due to the corrosion degree, and it is also difficult to determine the specific load for limiting traffic according to the corrosion degree. Therefore, it is difficult to transfer the temporary bridge to the next project for continued use. For projects with a construction period of more than 2 years, the temporary bridge is generally scrapped after completion, resulting in an increase in construction cost. SUMMARY

[0004] The purpose of the present application is to provide a steel-concrete combined temporary bridge suitable for marine environment to reduce the amount of steel material, reduce the influence of seawater corrosion on the stress of the temporary bridge, and improve the turnover rate of materials and reduce the construction cost.

[0005] The technical solution of the present application is as follows:

[0006] A steel-concrete combined temporary bridge suitable for marine environment, comprising a temporary bridge foundation and a bridge deck plate, the temporary bridge foundation comprising two rows of steel pipe piles arranged in the direction of the bridge, and a load-bearing beam is erected on the top of every two steel pipe piles in the transverse direction of the bridge, and the bridge deck plate is supported on the load-bearing beam, characterized in that: the bridge deck plate is erected in the form of a simply supported beam, and each span of the bridge deck plate comprises at least two concrete precast beams, the bottom of each precast beam is arched, the bottom surface of each precast beam at both ends is supported on two load-bearing beams respectively, at least two tenons integrally cast with the precast beam are arranged at both ends of each precast beam respectively, each tenon is a plate-shaped structure in the height direction of the precast beam, there is a mortise with a width equal to or greater than the thickness of the tenon between two adjacent tenons, and the precast beams at the end portions of two adjacent spans of the bridge deck plate are embedded with each other through the tenon and the mortise.

[0007] Further, the present application can further include the following technical features: at least two pull rod through holes are symmetrically arranged on each prefabricated beam in the transverse direction of the bridge, and a pair of pull rods are arranged through the pull rod through holes between the prefabricated beams of each bridge deck slab to connect the prefabricated beams of each bridge deck slab into a whole.

[0008] At least two tie rods are respectively connected between the two ends of each prefabricated beam, and the two ends of each tie rod are anchored to the two ends of the prefabricated beam.

[0009] The tie rod is a high-strength prestressed steel rod or a prestressed steel strand.

[0010] The two ends of each tie rod respectively penetrate the tenon at the two ends of the prefabricated beam in the longitudinal direction of the bridge and are screwed with anchor nuts.

[0011] A plurality of weight reduction holes are arranged on each prefabricated beam in the transverse direction of the bridge, and the plurality of weight reduction holes are symmetrically arranged on both sides of the transverse center line of the prefabricated beam.

[0012] The two side planes of each tenon are parallel to the longitudinal direction of the prefabricated beam, the two side planes of the tenon are triangular structures, the base of the triangular tenon is located at the bottom of the bridge deck slab, one side is inclined outwardly of the bridge deck slab, and the other side is inclined inwardly of the bridge deck slab.

[0013] The top surface of the bearing beam is provided with a shock-absorbing rubber pad, and the two ends of each prefabricated beam are supported on the shock-absorbing rubber pad on the bearing beam.

[0014] Compared with the existing steel structure temporary bridge, the present application has the following beneficial effects:

[0015] 1. The bridge deck slab adopts a prefabricated concrete structure, which improves the corrosion resistance and long-term service capability of the temporary bridge in the marine environment, and can save a large amount of maintenance cost.

[0016] 2. The bridge deck slab adopts a tie rod arch bridge structure, which utilizes the compression resistance of the arch structure to improve the bearing capacity of the superstructure of the temporary bridge.

[0017] 3. The mortise and tenon type engagement structure is adopted between the arch feet of the prefabricated bridge deck slab, which not only increases the overall stability of the structure, but also enables the two-span bridge deck slab to be supported on the same bearing beam of a row of steel pipe piles, without the need to increase the diameter of the steel pipe to set a widened bearing beam.

[0018] 4. Compared with the Bailey and other steel temporary bridge components, the corrosion-resistant coating area of the tie rod is greatly reduced, and the tie rod can be replaced at any time in the case of corrosion.

[0019] 5. The weight reduction holes are arranged on the concrete bridge deck slab, which can reduce the weight of the bridge deck slab and facilitate hoisting and transportation.

[0020] 6. Each span of the bridge deck slab adopts a plurality of prefabricated concrete beams, which are connected into a whole in the transverse direction by tie rods, thereby reducing the hoisting and transportation weight of the single unit.

[0021] 7. The prefabricated concrete beam has low processing cost, and can be recycled and reused after use, and can be crushed for bridge head cone slope protection after damage, thereby saving resources.

[0022] 8. In overseas project construction, the concrete bridge deck can be prefabricated on site, thereby saving steel purchase investment and international transportation and customs clearance cost, and the cost advantage is more obvious. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a side view of the bridge in the direction of the invention;

[0024] Figure 2 is a schematic view of the plan structure of the invention;

[0025] Figure 3 is an elevation view of the bridge in the transverse direction of the invention;

[0026] Figure 4 is a schematic view of the three-dimensional structure of a prefabricated beam;

[0027] Figure 5 is an enlarged view of A in Figure 1

[0028] Figure 6 is a schematic view of the installation state of the invention. DETAILED DESCRIPTION

[0029] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 , the steel-concrete combined temporary bridge of the invention comprises a temporary bridge foundation and a bridge deck, the temporary bridge foundation comprises two rows of steel pipe piles 1 arranged in the direction of the bridge, a load-bearing beam 2 is arranged on the top of every two steel pipe piles 1 in the transverse direction of the bridge, the bridge deck is supported on the load-bearing beams, the bridge deck adopts a simply supported beam erection form, each span of the bridge deck comprises at least two prefabricated concrete beams 3, the bottom of each prefabricated beam 3 is arched, the bottom surface of each prefabricated beam 3 at both ends is supported on two load-bearing beams 2 respectively, at least two tenons 31 integrally cast with the prefabricated beam are arranged at both ends of each prefabricated beam 3 respectively, each tenon is a plate-shaped structure in the height direction of the prefabricated beam, there is a mortise 32 with a width equal to or greater than the thickness of the tenon between two adjacent tenons 31, and the end portions of the prefabricated beams 3 of two adjacent spans of the bridge deck are embedded with each other through the tenons 31 and the mortises 32.

[0030] In the specific implementation of the invention, at least two pull rod through holes 33 can be arranged symmetrically in the transverse direction of each prefabricated beam 3, and the pull rod through holes of each prefabricated beam of each span of the bridge deck are arranged through the pull rod 4, so that each prefabricated beam of each span of the bridge deck is connected into a whole.

[0031] ​In the embodiment of the present application, at least two tie rods 5 are connected between the two ends of each prefabricated beam 3, and the two ends of each tie rod are anchored to the two ends of the prefabricated beam.

[0032] The tie rod 5 can be a high-strength prestressed steel rod or a prestressed steel strand. To resist corrosion in the marine environment, an anti-corrosion coating is applied to the tie rod.

[0033] Since the tenon is a plate structure, to increase the shear capacity of the tenon, the two ends of each tie rod 5 can be threaded through the tenon 31 at the two ends of the prefabricated beam in the bridge direction and screwed to the anchor nuts.

[0034] In the embodiment of the present application, to reduce the self-weight of the prefabricated beam, a plurality of weight-reducing holes 34 can be provided on each prefabricated beam 3 in the transverse direction of the bridge, and the plurality of weight-reducing holes are symmetrically arranged on both sides of the transverse center line of the prefabricated beam.

[0035] As shown in Figure 4 In the embodiment of the present application, the two sides of each tenon 31 at the two ends of the prefabricated beam are arranged to be parallel to the longitudinal direction of the prefabricated beam, the two side planes of the tenon are arranged in a triangular structure, the base of the triangular tenon is located at the bottom of the bridge deck, one side is inclined outwardly of the bridge deck, and the other side is inclined inwardly of the bridge deck. The above structure can make the opposite ends of the two-span bridge deck have only one transverse joint on the bridge deck, ensuring the flatness of the bridge deck, and increase the length of the base of the tenon, so that the base of the tenon of the two-span bridge deck can be completely supported on the same load-bearing beam, ensuring the stability of each span of the bridge deck, and there is no need to increase the diameter of the steel pipe pile for increasing the width of the load-bearing beam.

[0036] As shown in Figure 6 In the embodiment of the present application, to reduce the impact of vehicles passing on the bridge deck, a shock-absorbing rubber pad 6 is arranged on the top surface of the load-bearing beam 22, and the shock-absorbing rubber pad 6 supports the two ends of each prefabricated beam 3 on the load-bearing beam.

[0037] As shown in Figure 6 The construction method of the present application is as follows:

[0038] After the foundation of the temporary bridge is set, the bridge deck is installed span by span, the prefabricated beams 3 of each span of the bridge deck are hoisted one by one, the tie rods 5 are pre-installed on each prefabricated beam, the hoisting ropes 7 are arranged in the two symmetrical weight-reducing holes 34 of each prefabricated beam to connect the hoisting machine for hoisting, after the prefabricated beams of each span of the bridge deck are hoisted, the tie rods 4 are arranged to connect the prefabricated beams 3 into a whole, and the abutting ends of the prefabricated beams of the two adjacent spans of the bridge deck are nested with each other in a mortise and tenon joint manner.

Claims

1. A steel-concrete composite temporary bridge suitable for marine environment, comprising a temporary bridge foundation and a bridge deck, the temporary bridge foundation comprising two rows of steel pipe piles arranged in the longitudinal direction of the bridge, and a load-bearing beam arranged on top of every two steel pipe piles in the transverse direction of the bridge, the bridge deck being supported on the load-bearing beam, characterized in that: The bridge deck is erected in a simply supported beam form, each span of the bridge deck comprises at least two concrete precast beams, each precast beam has an arch-shaped bottom, the bottom surface of each precast beam is supported on two bearing beams at two ends thereof, at least two tenons integrally cast with the precast beam are arranged at two ends of each precast beam respectively, each tenon is a plate-shaped structure along the height direction of the precast beam, there is a tenon groove between two adjacent tenons, the width of the tenon groove is equal to or greater than the thickness of the tenon, and the end portions of the precast beams of two adjacent spans of the bridge deck are embedded with each other through the tenons and the tenon grooves.

2. The steel-concrete composite temporary bridge suitable for marine environment according to claim 1, characterized in that: At least two tie rod through holes are symmetrically arranged on each precast beam in the transverse direction of the bridge, and a tie rod is arranged through the tie rod through holes of the precast beams of each span of the bridge deck to connect the precast beams of each span of the bridge deck into a whole.

3. The steel-concrete composite bridge for marine environment according to claim 2, characterized in that: At least two tie rods are connected between the two ends of each precast beam, and the two ends of each tie rod are anchored to the two ends of the precast beam.

4. The steel-concrete composite bridge for marine environment according to claim 3, characterized in that: The tie rod is a high-strength pre-stressed steel bar or a pre-stressed steel strand.

5. The steel-concrete composite bridge adapted for marine environment according to claim 3, characterized in that: The two ends of each tie rod pass through the tenons at the two ends of the precast beam in the longitudinal direction of the bridge and are screwed with anchor nuts.

6. The steel-concrete composite bridge for marine environment according to claim 2, characterized in that: A plurality of lightening holes are arranged on each precast beam in the transverse direction of the bridge, and the plurality of lightening holes are symmetrically arranged on both sides of the transverse center line of the precast beam.

7. The steel-concrete composite bridge adapted for marine environment according to claim 2, characterized in that: The two side planes of each tenon are parallel to the longitudinal direction of the precast beam, the two side planes of the tenon are triangular structures, the bottom side of the triangular tenon is located at the bottom of the bridge deck, one side thereof is inclined outward of the bridge deck, and the other side thereof is inclined inward of the bridge deck.

8. The steel-concrete composite bridge adapted for marine environment according to claim 1, characterized in that: The top surface of the bearing beam is provided with a shock-absorbing rubber pad, and the bottom of each precast beam is supported on the shock-absorbing rubber pad of the bearing beam.

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