An integrated construction method for a fully prefabricated bridge without landing

Abstract

The present invention is a method for integrally constructing a fully prefabricated bridge without landing, comprising the following steps: Step 1: Preparation before construction; the precast piles located at the starting point of the bridge route are driven in advance, the temporary pile caps are installed on the tops of the precast piles, and two-span Bailey beams, front single-span Bailey beams, rear single-span Bailey beams, front half-span single-span Bailey beams, and rear half-span single-span Bailey beams are fabricated; the two-span Bailey beams, front single-span Bailey beams, rear single-span Bailey beams, front half-span single-span Bailey beams, and rear half-span single-span Bailey beams are sequentially placed on the temporary pile caps; a front crawler crane is placed on the two-span Bailey beams, and a rear crawler crane is placed on the rear half-span single-span Bailey beams; Step 2: Piling construction; Step 3: Girder hoisting construction; Step 2 and Step 3 are constructed simultaneously. After the precast main girders are hoisted, the deck system structure is sequentially constructed, and the bridge construction is completed. The present invention protects the ground environment, has low cost, high stability, and good flexibility, and brings great convenience to the construction of small- and medium-span prefabricated bridges.

Description

Technical Field

[0001] The present invention relates to the technical field of assembled bridge construction, and particularly relates to a non-grounded integrated construction method for fully assembled bridges. Background Art

[0002] The construction technology of fully assembled bridges refers to the bridge construction technology in which the pile foundations, capping beams, main girders, etc. of the bridges are prefabricated in factories and assembled on site. This technology has high construction quality, short construction period and less impact on the on-site environment and traffic. For example, the combination of precast prestressed pipe piles, precast capping beams and precast small box girders is one of the common forms of existing assembled bridges.

[0003] In the existing bridge construction, crawler cranes and integrated bridge erecting machines can be used for installation on site. When using a crawler crane for hoisting, the crawler crane needs to have a large lifting capacity, and even the method of double-crane lifting is adopted. This method requires the ground to be treated to have sufficient bearing capacity, which will not only cause great damage to the environment, but also lose the advantages of rapid construction and environmental protection of assembled bridges. In addition, although the use of an integrated bridge erecting machine for installation can achieve non-grounded construction, the rental and installation costs of the integrated bridge erecting machine are very high, and it is not flexible enough and not applicable to short-span and curved bridges. Summary of the Invention

[0004] The present invention aims to solve the deficiencies of the existing technology and provides a non-grounded integrated construction method for fully assembled bridges.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A non-grounded integrated construction method for fully assembled bridges includes the following steps:

[0007] Step 1: Preparation before construction;

[0008] S1. The precast piles located at the starting point of the bridge route are driven in advance, the temporary pile caps are installed on the tops of the precast piles, and two-span Bailey beams, front single-span Bailey beams, rear single-span Bailey beams, front half-span single-span Bailey beams and rear half-span single-span Bailey beams are fabricated;

[0009] S2. The two-span Bailey beams, front single-span Bailey beams, rear single-span Bailey beams, front half-span single-span Bailey beams and rear half-span single-span Bailey beams are sequentially placed on the temporary pile caps;

[0010] S3. The front crawler crane is placed on the two-span Bailey beam, and the rear crawler crane is placed on the rear half-span single-span Bailey beam;

[0011] Step 2: Piling construction;

[0012] S4. The front crawler crane drives the precast piles of the next span on the two-span Bailey beam;

[0013] S5. After pile driving is completed, install a temporary pile cap;

[0014] S6. The front crawler crane retreats to the front single-span Bailey beam, and hoists the two-span Bailey beam forward by one span;

[0015] S7. The front crawler crane hoists the rear single-span Bailey beam behind it onto the temporarily vacant pile cap adjacent to the front;

[0016] S8. The front crawler crane moves forward to the two-span Bailey beam and continues to drive the precast piles for the next span, and so on for each span;

[0017] Step Three: Girder Hoisting Construction;

[0018] S9. The rear crawler crane hoists a rear half-span single-span Bailey beam onto the front half-span single-span Bailey beam in front, and then hoists a half-span precast main girder at the vacant position. Before hoisting the half-span precast main girder, first hoist the corresponding half-span precast capping beam onto the precast pile;

[0019] S10. The rear crawler crane moves to the installed half-span precast main girder, continues to hoist the remaining rear half-span single-span Bailey beam onto the front half-span single-span Bailey beam in front, and the two rear half-span single-span Bailey beams are placed on top of each other. Then hoist the other half-span precast main girder at the vacant position. Before hoisting the other half-span precast main girder, first hoist the corresponding other half-span precast capping beam onto the precast pile;

[0020] S11. The rear crawler crane moves forward to the front half-span single-span Bailey beam without the rear half-span single-span Bailey beam placed on it, and then hoists the two rear half-span single-span Bailey beams onto the temporarily vacant pile cap adjacent to the front one by one, and so on for each span to install the precast capping beam and the precast main girder;

[0021] Step Two and Step Three are constructed simultaneously. After the precast main girder is hoisted, the bridge deck system structure is constructed in sequence to complete the bridge construction.

[0022] Specifically, the precast pile is a high-strength precast prestressed pipe pile with a diameter of 90 cm, and the length is determined according to the geological conditions. It is driven into the ground by a diesel hammer hoisted by the front crawler crane.

[0023] Specifically, the temporary pile cap is of reinforced concrete structure, and the inner diameter of the bottom groove is the same as the diameter of the precast pile. It is hoisted by the front crawler crane and buckled onto the precast pile that has been driven.

[0024] Specifically, the precast capping beam is of reinforced concrete structure, and the two half-span precast capping beams are connected by transverse prestress.

[0025] Specifically, the precast main girder is a prestressed reinforced concrete T-beam or box girder with a length of 20 m and a height of 1.5 m.

[0026] Specifically, the two-span Bailey truss is a double-layer two-span continuously assembled Bailey truss with a length of 40 m and a height of 3 m.

[0027] Specifically, the front single-span Bailey truss and the rear single-span Bailey truss are double-layer single-span Bailey trusses with a length of 20 m and a height of 3 m.

[0028] Specifically, the front half-span single-span Bailey truss and the rear half-span single-span Bailey truss are single-layer single-span Bailey trusses with a length of 20 m, a height of 1.5 m, and a width that is half of the bridge deck width.

[0029] Specifically, a pile foundation guide frame is arranged in front of the two-span Bailey truss to improve the pile driving accuracy.

[0030] Specifically, an operation platform is arranged in front of the two-span Bailey truss to facilitate manual pile cutting and pile splicing.

[0031] The beneficial effects of the present invention are as follows: The present invention uses the Bailey truss as a platform to realize the non-ground construction of the fully prefabricated bridge for pile driving and beam erection on the bridge deck by using a crawler crane. Compared with the crawler crane for hoisting on the ground, when the crawler crane works on the bridge deck, there is no need to treat the ground and the environment is not damaged; compared with an integral bridge erecting machine, this method has low construction cost, good flexibility, high stability, and convenient construction; it brings great convenience to the construction of small and medium-span prefabricated bridges. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a pile driving schematic diagram of the present invention;

[0033] Figure 2 It is a schematic diagram of pile cap hoisting and the displacement of a rear half-span single-span Bailey truss of the present invention;

[0034] Figure 3 It is a schematic diagram of the retreat of the front crawler crane and the hoisting of a half-span precast cap beam and a main beam of the present invention;

[0035] Figure 4 It is a schematic diagram of the forward movement of the two-span Bailey truss and the displacement of another rear half-span single-span Bailey truss, and the hoisting of another half-span precast cap beam and a main beam of the present invention;

[0036] Figure 5 It is a schematic diagram of the forward movement of the rear single-span Bailey truss and the forward movement of the rear crawler crane of the present invention;

[0037] Figure 6 It is a schematic diagram of driving a precast pile for the next span and the forward hoisting and positioning of two rear half-span single-span Bailey trusses of the present invention;

[0038] In the figure: 1 - precast pile; 2 - temporary pile cap; 3 - precast cap beam; 4 - precast main beam; 5 - two-span Bailey truss; 6 - front single-span Bailey truss; 7 - rear single-span Bailey truss; 8 - front half-span single-span Bailey truss; 9 - rear half-span single-span Bailey truss; 10 - front crawler crane; 11 - rear crawler crane;

[0039] The following will be described in detail with reference to the accompanying drawings in combination with the embodiments of the present invention. Specific embodiments

[0040] The present invention will be further described below in combination with embodiments:

[0041] As Figures 1-6 shown, a fully prefabricated bridge non-ground integrated construction method includes the following steps:

[0042] Step 1: Preparation before construction;

[0043] S1. The precast pile 1 at the starting point of the bridge route is driven in advance, the temporary pile cap 2 is installed on the top of the precast pile 1, and two-span Bailey beams 5, front single-span Bailey beam 6, rear single-span Bailey beam 7, front half-span single-span Bailey beam 8, and rear half-span single-span Bailey beam 9 are fabricated;

[0044] S2. The two-span Bailey beams 5, front single-span Bailey beam 6, rear single-span Bailey beam 7, front half-span single-span Bailey beam 8, and rear half-span single-span Bailey beam 9 are sequentially placed on the temporary pile cap 2;

[0045] S3. The front crawler crane 10 is placed on the two-span Bailey beam 5, and the rear crawler crane 11 is placed on the rear half-span single-span Bailey beam 9; the front crawler crane 10 is responsible for driving piles, and the rear crawler crane 11 is responsible for hoisting the precast capping beam 3 and precast main beam 4;

[0046] Among them, the precast pile 1 is a high-strength precast prestressed pipe pile with a diameter of 90 cm, and the length is determined according to the geological conditions; the temporary pile cap 2 is a reinforced concrete structure, and the inner diameter of the bottom groove is the same as the diameter of the precast pile 1, and is hoisted and buckled on the precast pile 1 that has been driven in by the front crawler crane 10; the precast capping beam 3 is a reinforced concrete structure, and the two half-width precast capping beams 3 are connected by horizontal prestress; the precast main beam 4 is a prestressed reinforced concrete T-beam or box girder with a length of 20 m and a height of 1.5 m.

[0047] The two-span Bailey beam 5 is a double-layer two-span continuous assembled Bailey beam with a length of 40 m and a height of 3 m; the front single-span Bailey beam 6 and rear single-span Bailey beam 7 are double-layer single-span Bailey beams with a length of 20 m and a height of 3 m; the front half-span single-span Bailey beam 8 and rear half-span single-span Bailey beam 9 are single-layer single-span Bailey beams with a length of 20 m, a height of 1.5 m, a width that is half of the bridge deck width, and the same height as the precast main beam 4.

[0048] A pile foundation guide frame can be set in front of the two-span Bailey beam 5 to improve the pile driving accuracy; an operation platform can also be set in front of the two-span Bailey beam 5 to facilitate manual pile cutting and pile splicing.

[0049] The Bailey beam is a steel truss structure. A one-span Bailey beam steel platform is formed by splicing multiple sections of Bailey beams, and a two-span Bailey beam is an integral Bailey beam steel platform spliced together from two spans.

[0050] Step 2: Pile construction;

[0051] S4, the front crawler crane 10 drives the precast pile 1 of the next span on the two-span Bailey beam 5; when driving the pile, the diesel hammer is hoisted by the front crawler crane 10, and multiple precast piles 1 in the same row can be driven in sequence;

[0052] S5, after the piling is completed, a temporary pile cap 2 is installed;

[0053] S6, the front crawler crane 10 moves backward to the front single-span Bailey beam 6, and moves the two-span Bailey beam 5 forward by one span;

[0054] S7, the front crawler crane 10 moves the rear single-span Bailey beam 7 behind it to the temporary pile cap 2 that is vacant in the next span in front;

[0055] S8, the front crawler crane 10 moves forward to the two-span Bailey beam 5, and continues to drive the precast piles 1 of the next span, and so on and so forth for each span;

[0056] Step 3: Beam construction;

[0057] S9, the rear crawler crane 11 hoists a rear half single-span Bailey beam 9 to the front half single-span Bailey beam 8, and then hoists the half prefabricated main beam 4 in the vacant position. Before hoisting the half prefabricated main beam 4, first hoist the corresponding half prefabricated cap beam 3 on the prefabricated pile 1;

[0058] S10, the rear crawler crane 11 is moved to the installed half-width prefabricated main beam 4, and the remaining other rear half-width single-span Bailey beam 9 is further hoisted and moved to the front half-width single-span Bailey beam 8, and the two rear half-width single-span Bailey beams 9 are stacked up and down, and then the other half-width prefabricated main beam 4 is hoisted in the vacant position. Before hoisting the other half-width prefabricated main beam 4, the corresponding other half-width prefabricated cap beam 3 is first hoisted on the prefabricated pile 1;

[0059] S11, the rear crawler crane 11 moves forward to the front half single-span Bailey beam 8 where the rear half single-span Bailey beam 9 is not placed, and then hoists the two rear half single-span Bailey beams 9 in sequence on the temporary pile cap 2 that is vacant in the front adjacent span, and so on, the prefabricated cap beam 3 and the prefabricated main beam 4 are installed one span at a time;

[0060] Step 2 and step 3 are constructed simultaneously. After the prefabricated main beam 4 is hoisted, the bridge deck structure is constructed in sequence to complete the bridge construction.

[0061] In the present invention, the half-width hoisting method can also be changed to a mutually alternating installation between the two widths of the bridge.

[0062] The present invention uses Bailey beams as a platform and realizes the non-ground construction of pile driving and beam erection on the bridge deck by using a crawler crane. Compared with the crawler crane for hoisting on the ground, when the crawler crane works on the bridge deck, there is no need to treat the ground and the environment is not damaged; compared with an integral bridge erecting machine, this method has low construction cost, good flexibility, high stability and convenient construction, which brings great convenience to the construction of small and medium-span prefabricated bridges.

[0063] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0064] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0065] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0066] The above is an exemplary description of the present invention. Obviously, the specific implementation of the present invention is not limited by the above methods. As long as various improvements are made by adopting the method concept and technical solution of the present invention, or directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. An integrated construction method for a fully prefabricated bridge without landing, characterized in that, It includes the following steps: Step 1: Preparation before construction; S1. The precast piles (1) located at the starting point of the bridge route are driven in advance. The temporary pile caps (2) are installed on the tops of the precast piles (1). The double-span Bailey beams (5), the front single-span Bailey beam (6), the rear single-span Bailey beam (7), the front half-span single-span Bailey beam (8), and the rear half-span single-span Bailey beam (9) are fabricated. Among them, the double-span Bailey beam (5) is a double-layer continuous assembled Bailey beam with a length of 40 m and a height of 3 m. The front single-span Bailey beam (6) and the rear single-span Bailey beam (7) are double-layer single-span Bailey beams with a length of 20 m and a height of 3 m. The front half-span single-span Bailey beam (8) and the rear half-span single-span Bailey beam (9) are single-layer single-span Bailey beams with a length of 20 m and a height of 1.5 m, and the width is half of the bridge deck width; S2. The double-span Bailey beam (5), the front single-span Bailey beam (6), the rear single-span Bailey beam (7), the front half-span single-span Bailey beam (8), and the rear half-span single-span Bailey beam (9) are placed on the temporary pile caps (2) in sequence; S3. The front crawler crane (10) is placed on the double-span Bailey beam (5), and the rear crawler crane (11) is placed on the rear half-span single-span Bailey beam (9); Step 2: Piling construction; S4. The front crawler crane (10) drives piles for the precast piles (1) of the next span on the double-span Bailey beam (5); S5. After piling is completed, the temporary pile caps (2) are installed; S6. The front crawler crane (10) retreats to the front single-span Bailey beam (6) and hoists the double-span Bailey beam (5) forward by one span; S7. The front crawler crane (10) hoists the rear single-span Bailey beam (7) behind it to the temporarily vacant pile cap (2) in the adjacent front span; S8. The front crawler crane (10) moves forward to the double-span Bailey beam (5) and continues to drive piles for the precast piles (1) of the next span, and so on for piling span by span; Step 3: Girder hoisting construction; S9. The rear crawler crane (11) hoists a rear half-span single-span Bailey beam (9) to the front half-span single-span Bailey beam (8), and then hoists a half-span precast main girder (4) at the vacant position. Before hoisting the half-span precast main girder (4), the corresponding half-span precast capping beam (3) is first hoisted on the precast pile (1); S10. The rear crawler crane (11) shifts to the installed half-span precast main girder (4) and continues to hoist the remaining other rear half-span single-span Bailey beam (9) to the front half-span single-span Bailey beam (8), and the two rear half-span single-span Bailey beams (9) are placed stacked on top of each other. Then, the other half-span precast main girder (4) is hoisted at the vacant position. Before hoisting the other half-span precast main girder (4), the corresponding other half-span precast capping beam (3) is first hoisted on the precast pile (1); S11. The rear crawler crane (11) moves forward to the front half-span single-span Bailey beam (8) where the rear half-span single-span Bailey beam (9) is not placed, and then hoists the two rear half-span single-span Bailey beams (9) to the temporarily vacant pile caps (2) in the adjacent front span in sequence, and so on for the installation of the precast capping beams (3) and the precast main girders (4) span by span; Step 2 and Step 3 are constructed simultaneously. After the precast main girder (4) is hoisted, the bridge deck system structure is constructed in sequence, and the bridge construction is completed.

2. The integrated construction method without landing for a fully prefabricated bridge according to claim 1, characterized in that, The precast pile (1) is a high-strength precast prestressed pipe pile with a diameter of 90 cm. Its length is determined according to the geological conditions and is driven into the ground by a front crawler crane (10) hoisting a diesel hammer.

3. The integrated construction method of a fully prefabricated bridge without landing according to claim 1, characterized in that The temporary pile cap (2) is made of reinforced concrete. The inner diameter of the bottom groove is the same as the diameter of the precast pile (1) and is hoisted by the front crawler crane (10) and buckled onto the already driven precast pile (1).

4. The integrated construction method of a fully prefabricated bridge without landing according to claim 1, characterized in that The precast capping beam (3) is made of reinforced concrete. The two half-width precast capping beams (3) are connected through transverse prestress.

5. A fully prefabricated bridge non-ground integrated construction method according to claim 1, characterized in that, The precast main beam (4) is a prestressed reinforced concrete T-beam or box girder with a length of 20 m and a height of 1.5 m.

6. The integrated construction method of an all prefabricated bridge without landing according to claim 1, characterized in that A pile foundation guide frame is set in front of the two-span Bailey beam (5) to improve the pile driving accuracy.

7. A fully prefabricated bridge non-ground integrated construction method according to claim 1, characterized in that An operation platform is set in front of the two-span Bailey beam (5) to facilitate manual pile cutting and pile splicing.

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