Composite beam assembly type wharf structure and construction method

Abstract

The invention provides a composite beam assembly type wharf structure and a construction method. The composite beam assembly type wharf structure comprises UHPC composite nodes and UHPC composite beams. The UHPC combined node comprises a UHPC adjustable bottom plate and a UHPC node side mold, the pile foundation is sleeved with the UHPC adjustable bottom plate, the UHPC node side mold is vertically arranged on the UHPC adjustable bottom plate, and a notch is formed in the position, corresponding to the UHPC combined beam, of the UHPC node side mold so that the UHPC combined beam can penetrate through the notch; the UHPC composite beam adopts a UHPC template, the cross section of the UHPC template is U-shaped, and a beam reinforcement cage and beam pouring concrete are arranged in the UHPC template. According to the scheme, the prefabricated UHPC serves as a permanent formwork, then concrete is poured, the strength of the prefabricated parts such as the UHPC composite beam can be ensured, the size of the corresponding UHPC composite beam can be reduced, the weight of the corresponding UHPC composite beam can be reduced along with improvement of the strength of the prefabricated parts, and the durability of the prefabricated parts can be greatly improved due to the fact that the UHPC formwork is located outside the prefabricated parts. And the connecting profile steel and the positioning profile steel are arranged, and the joint strength can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of assembled wharfs, in particular to a composite beam assembled wharf structure and a construction method. Background Art

[0002] At present, new materials are rarely used in wharf design, and structural components are relatively heavy and difficult to transport. Most of the prefabricated components of the wharf are transported to the construction site by water, and road transportation is rarely used. However, for reservoir engineering construction, this mode of transportation is not conducive to wharf construction. Chinese patent document CN109267537A discloses an assembled pile foundation wharf component and connection method, which records filling UHPC between components. To improve the strength of the structure. UHPC is ultra-high performance concrete, with a compressive strength of up to 150MPa. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a composite beam assembled wharf structure and a construction method, which can reduce the size of the prefabricated components of the assembled wharf, reduce the weight of the prefabricated components, improve the durability of the assembled wharf, reduce the requirements for the lifting weight of the lifting equipment, and is economical.

[0004] In order to solve the above technical problems, the technical solution of the present invention is: a composite beam assembled wharf structure, including a UHPC composite node and a UHPC composite beam; The UHPC composite node includes a UHPC adjustable bottom plate and a UHPC node side form. The UHPC adjustable bottom plate is sleeved on the pile foundation. The UHPC node side form is vertically arranged on the UHPC adjustable bottom plate. The UHPC node side form is provided with a notch at a position corresponding to the UHPC composite beam so that the UHPC composite beam can pass through. The UHPC composite beam adopts a UHPC formwork, the cross-section of which is in a "U" shape. A beam reinforcement cage and beam casting concrete are arranged inside the UHPC formwork.

[0005] In a preferred solution, the UHPC adjustable bottom plate and the UHPC node side mold are an integrated structure, and the UHPC node side mold is fixedly connected to the UHPC adjustable bottom plate.

[0006] In the preferred solution, the UHPC adjustable bottom plate and the UHPC node side mold are separate structures, and the UHPC node side mold is provided with a connecting plate at the position of the notch.

[0007] In a preferred solution, vertically arranged positioning steel is provided in the pile foundation and at the end of the UHPC composite beam, and the end of the steel bar of the UHPC composite beam is connected to the positioning steel; There is also a horizontally arranged connecting steel, which connects a plurality of positioning steels into one; The cavity between the UHPC node side formwork and the UHPC composite beam is filled with cast concrete.

[0008] In the preferred solution, a supporting corbel is provided on the outer wall of the pile foundation, and the UHPC adjustable bottom plate is divided into an upper platform and a lower platform, the upper platform and the lower platform are sleeved on the pile foundation, and the reserved gap between the upper platform and the pile foundation is larger than the gap between the lower platform and the pile foundation; The reserved gap is used to adjust the horizontal position of the upper platform.

[0009] In a preferred solution, mutually connected grooves are provided on the upper platform and the lower platform, and UHPC is poured in the grooves.

[0010] In the preferred solution, an intelligent corbel is further provided, the base of which is fixedly connected to the pile foundation, and a plurality of jacking devices are provided on the edge of the base. The jacking devices are pressed against the edge of the lower platform to assist in adjusting the elevation and levelness of the lower platform.

[0011] In the preferred embodiment, UHPC comprises the following components in mass ratio: P·I52.5 Portland cement 1; lime powder 0.2~0.27; silica fume 0.05~0.1; graded quartz sand 1.3~1.5; polycarboxylic acid high performance water reducing agent 0.015~0.018; The corrugated copper-plated steel fiber is added in 2% of the dry material volume; The grading parameters of graded quartz sand are as follows: the volume ratio of particle size d50-1mm accounts for 57%; particle size d50-0.5mm accounts for 25%; particle size d50-0.2mm accounts for 13%, and the remainder is 5%; The volume water-cement ratio is 0.16.

[0012] A construction method of the composite beam assembled wharf structure comprises the following steps: S1. Prepare UHPC composite beams in the factory; First, UHPC formwork is prepared with UHPC, then beam reinforcement cage is installed in the UHPC formwork, and beam concrete is poured in the UHPC formwork; S2. Install the UHPC adjustable base plate and UHPC node side formwork on the pile foundation; S3, hoisting the UHPC composite beam on the UHPC adjustable bottom plate, the UHPC composite beam is located at the notch position of the UHPC node side form; S4. Vertically install part of the positioning steel into the pile foundation, connect the other part of the vertical positioning steel with the end steel bars of the UHPC composite beam, and connect the positioning steels with each other using horizontal connecting steels; S5. pour concrete within the range of the UHPC node side formwork to form a pouring node; Through the above steps, the construction of the prefabricated wharf structure is realized.

[0013] In the preferred embodiment, in step S2; S21, first install the intelligent corbel on the pile foundation, then place the lower platform on the supporting corbel of the outer wall of the pile foundation, detect the horizontal elevation position of the lower platform by the total station, the jacking device of the intelligent corbel first jacks up the lower platform at the lowest position to a preset elevation, and the other jacking devices of the intelligent corbel jack up the lower platform to a preset elevation; S22, a pad is provided between the lower platform and the supporting corbel; S23, install the upper platform, and adjust the position of the upper platform according to the designed position level; S24. Pour UHPC concrete into the groove between the upper platform and the lower platform.

[0014] The present invention provides a composite beam assembled wharf structure and construction method. By using the scheme of using prefabricated UHPC as a permanent template and then pouring concrete, the strength of prefabricated components such as UHPC composite beams can be ensured. Moreover, as the strength of the prefabricated components is improved, the size of the corresponding UHPC composite beams can be reduced, the weight can be reduced, and since the UHPC template is located outside the prefabricated components, the durability of the prefabricated components can be greatly improved. The provided connecting steel and positioning steel can improve the node strength, reduce the construction steps of hoisting pile caps, and the dimensional accuracy of the node position is higher. The connection strength between the UHPC composite beams is also higher, and the construction difficulty can also be reduced, such as the construction difficulty of the steel bar end connection. The combined structure of the lower platform and the upper platform can conveniently compensate for the position error of the pile foundation, and the provided groove structure can improve the connection strength between the lower platform and the upper platform. The construction method of the present invention can quickly and accurately ensure the elevation accuracy and horizontal accuracy of the UHPC adjustable bottom plate through the provided intelligent corbel. In addition to the advantages of rapid assembly and construction, the construction method of the composite beam assembled wharf of the present invention also has the advantages of high precision, high durability and high strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a schematic top view of the composite beam assembly structure of the present invention.

[0016] Figure 2 It is a schematic cross-sectional view of a UHPC formwork of a UHPC composite beam of the present invention.

[0017] Figure 3 It is a top view schematic diagram of the composite beam assembly structure after casting of the present invention.

[0018] Figure 4 It is a schematic cross-sectional view of the UHPC composite beam of the present invention.

[0019] Figure 5It is a schematic elevation view of the UHPC composite beam connection structure of the present invention.

[0020] Figure 6 It is a schematic elevation view of the node position of the present invention.

[0021] Figure 7 It is a top view of the overall structure of the composite beam assembled wharf structure of the present invention.

[0022] In the figure: UHPC composite beam 1, UHPC formwork 101, beam cast concrete 102, beam reinforcement cage 103, UHPC node side formwork 2, pile foundation 3, node cavity 4, UHPC adjustable bottom plate 5, side baffle 6, tie rod screw 7, top rod 8, connecting steel 9, positioning steel 10, reserved gap 11, lower platform 12, intelligent corbel 13, jacking device 131, base 132, casting node 14, groove 15, upper platform 16, supporting corbel 17. DETAILED DESCRIPTION

[0023] Embodiment 1: like Figures 1 to 5 , 7, a composite beam assembled wharf structure, comprising a UHPC composite node and a UHPC composite beam 1; The UHPC composite node includes a UHPC adjustable bottom plate 5 and a UHPC node side form 2. The UHPC adjustable bottom plate 5 is sleeved on the pile foundation 3. The UHPC node side form 2 is vertically arranged on the UHPC adjustable bottom plate 5. The UHPC node side form 2 is provided with a notch at a position corresponding to the UHPC composite beam 1, so that the UHPC composite beam 1 can pass through. The UHPC composite beam 1 adopts a UHPC template 101, the cross section of which is in a "U" shape, and a beam reinforcement cage 103 and a beam casting concrete 102 are arranged inside the UHPC template 101. With this structure, the UHPC template 101, the UHPC adjustable bottom plate 5 and the UHPC node side form 2 can improve the strength of the UHPC composite node and the UHPC composite beam 1 and the durability of the entire wharf structure. Moreover, since the concrete cast in the UHPC template 101, the UHPC adjustable bottom plate 5 and the UHPC node side form 2 adopts ordinary C40 or C50 concrete, the overall cost does not increase much, while the performance is greatly improved. Moreover, the solution of cast-in-place nodes is adopted, the overall assembly accuracy is high, and the accuracy requirements for the pile foundation 3 are not high. It has a very high application prospect.

[0024] In an optional solution, the UHPC adjustable bottom plate 5 and the UHPC node side mold 2 are an integrated structure, and the UHPC node side mold 2 is fixedly connected to the UHPC adjustable bottom plate 5. With this structure, the assembly efficiency is improved, but the processing accuracy of the prefabricated components is required to be relatively high.

[0025] In another optional solution, the UHPC adjustable bottom plate 5 and the UHPC node side form 2 are separate structures, and a connecting plate is provided at the position of the notch of the UHPC node side form 2. This structure further improves the overall assembly accuracy of the wharf structure, can reduce the requirements for the construction accuracy of the pile foundation 3, and improve the overall construction efficiency.

[0026] The preferred solution is Figure 5 In the embodiment, a vertically arranged positioning steel 10 is provided in the pile foundation 3 and at the end of the UHPC composite beam 1, and the end of the steel bar of the UHPC composite beam 1 is connected to the positioning steel 10; A horizontally arranged connecting steel 9 is also provided, and the connecting steel 9 connects a plurality of positioning steels 10 into one. With this structure, the concrete strength at the node position is improved, and there is no need to prefabricate and hoist pile caps, which further improves the accuracy of the wharf structure and solves the problem of connecting the steel bars at the ends of the UHPC composite beam 1.

[0027] The cavity between the UHPC node side formwork 2 and the UHPC composite beam 1 is filled with cast concrete to reduce the overall cost. The cast concrete is preferably ordinary C40 or C50 concrete.

[0028] The preferred solution is Figure 6 In the embodiment, a supporting corbel 17 is provided on the outer wall of the pile foundation 3, and the UHPC adjustable bottom plate 5 is divided into an upper platform 16 and a lower platform 12, the upper platform 16 and the lower platform 12 are sleeved on the pile foundation 3, and a reserved gap 11 between the upper platform 16 and the pile foundation 3 is larger than a gap between the lower platform 12 and the pile foundation 3; The reserved gap 11 is used to adjust the horizontal position of the upper platform 16. With this structure, when the position accuracy of the pile foundation 3 exceeds the tolerance, the error of the position accuracy of the pile foundation 3 can be compensated by adjusting the horizontal position of the upper platform 16. When the position accuracy of the pile foundation 3 is in error, the horizontal position of the upper platform 16 is moved to compensate for the error. That is, the redundancy of the pile foundation construction error of the present invention is improved. Even if the error of the pile foundation construction is large, the installation accuracy of each component of the prefabricated wharf is not affected, which is very critical for the prefabricated wharf structure.

[0029] The preferred solution is Figure 6 In the embodiment, the upper platform 16 and the lower platform 12 are provided with mutually connected grooves 15, and UHPC is poured in the grooves 15. When the upper platform 16 is adjusted, a shear key structure is formed by pouring UHPC in the pouring groove 15, so that the position of the upper platform 16 and the position between the upper platform 16 and the pile foundation 3 are reliably fixed.

[0030] The preferred solution is Figure 6In the embodiment, an intelligent corbel 13 is also provided, the base 132 of the intelligent corbel 13 is fixedly connected to the pile foundation 3, and a plurality of jacking devices 131 are provided at the edge of the base 132. The jacking devices 131 are supported on the edge of the lower platform 12 to assist in adjusting the elevation and levelness of the lower platform 12. Through the auxiliary detection sensors and detection equipment, the intelligent corbel 13 can automatically level the UHPC adjustable bottom plate 5.

[0031] In the preferred embodiment, UHPC comprises the following components in mass ratio: P·I52.5 Portland cement 1; lime powder 0.2~0.27; silica fume 0.05~0.1; graded quartz sand 1.3~1.5; polycarboxylic acid high performance water reducing agent 0.015~0.018; The corrugated copper-plated steel fiber is added in 2% of the dry material volume; The grading parameters of graded quartz sand are as follows: the volume ratio of particle size d50-1mm accounts for 57%; particle size d50-0.5mm accounts for 25%; particle size d50-0.2mm accounts for 13%, and the remainder is 5%; The volume water-cement ratio is 0.16. Due to the special requirements of the thin-walled structure of the UHPC formwork, the present invention optimizes the components of UHPC. 1. The water-cement ratio is increased to improve the fluidity of UHPC, which is convenient for mold casting and forming. Corrugated copper-plated steel fiber is used to improve the tensile properties of UHPC. Optimized graded quartz sand is further used to increase the packing density, thereby improving the tensile strength. Standard tensile and flexural specimens are prepared. The tensile specimen is a cylindrical concrete specimen with a length of 300 mm and a diameter of 150 mm. The flexural specimen is a rectangular concrete specimen with a length of 300 and a cross section of a square with a side length of 100 mm. According to the concrete tensile strength test standard and the concrete flexural strength test standard, the improved UHPC can reach a tensile strength of 16 MPa and a flexural strength of 31 MPa.

[0032] Embodiment 2: Based on Example 1, a construction method of the above-mentioned composite beam assembled wharf structure includes the following steps: S1. Preparing a UHPC composite beam 1 in a factory; First, a UHPC formwork 101 is prepared with the above-mentioned UHPC components, then a beam reinforcement cage 103 is installed in the UHPC formwork 101, and beam casting concrete 102 is poured in the UHPC formwork 101; like Figure 2In the casting beam, when pouring concrete 102, a tensioning assembly is installed on the top of the UHPC formwork 101. The tensioning assembly includes side baffles 6 located on both sides of the UHPC formwork 101, and a tie rod screw 7 is located in the middle of the side baffles 6. The tie rod screw 7 is threadedly connected to the side baffles 6. A top rod 8 is provided at the upper end of the side baffle 6. The top rod 8 is pushed between the two side baffles 6. The lower part of the side baffle 6 is located outside the two sides of the UHPC formwork 101, thereby protecting the UHPC formwork 101 and avoiding damage during the pouring process.

[0033] S2, installing the UHPC adjustable base plate 5 and the UHPC node side form 2 on the pile foundation 3; In the preferred embodiment, in step S2; S21, first install the intelligent bracket 13 on the pile foundation 3, then place the lower platform 12 on the supporting bracket 17 of the outer wall of the pile foundation 3, and use the total station to detect the horizontal elevation position of the lower platform 12 to obtain the error between the bottom of the lower platform 12 and the design elevation; An inclination sensor or a gyroscope is arranged on the lower platform 12; Preferably, the lifting device 131 of the intelligent corbel 13 first lifts the lower platform 12 at the lowest position to a preset elevation. Equivalently, lifting other positions is also possible, but the efficiency is relatively low and the leveling accuracy is reduced. According to the data of the inclination sensor or the gyroscope, the inclination error of other positions is obtained, and the main control device, such as an industrial computer, calculates the lifting elevation of other lifting devices 131, and the other lifting devices 131 of the intelligent corbel 13 lift the lower platform 12 to the preset elevation; if the inclination sensor is used for detection, two groups of inclination sensors are provided to detect the inclination in mutually perpendicular directions respectively. The use of a gyroscope is to obtain the pitch angle and roll angle parameters, the pitch angle refers to the front and rear inclination parameters of the preset direction of the gyroscope, and the roll angle refers to the left and right inclination parameters of the preset direction of the gyroscope.

[0034] S22, a pad is arranged between the lower platform 12 and the supporting corbel 17; the lower platform 12 is reliably supported on the supporting corbel 17.

[0035] S23, install the upper platform 16, and adjust the position of the upper platform 16 horizontally according to the designed position; the horizontal adjustment can be performed by using a crane combined with an electric hoist, that is, after the upper platform 16 falls on the lower platform 12, the upper platform 16 is connected to the pile foundation 3 by an electric hoist, the crane tightens the wire rope, and then the electric hoist is pulled to adjust the horizontal position of the upper platform 16.

[0036] S24, pouring UHPC concrete in the groove 15 between the upper platform 16 and the lower platform 12. The UHPC concrete adopts the components in Example 1, and the volume water-cement ratio is 0.15.

[0037] S3, hoisting the UHPC composite beam 1 on the UHPC adjustable bottom plate 5, the UHPC composite beam 1 is located at the notch position of the UHPC node side form 2; S4, vertically install part of the positioning steel into the pile foundation 3, connect the other part of the vertical positioning steel with the end steel bars of the UHPC composite beam 1, and connect the positioning steels to each other with horizontal connecting steels 9; S5, pouring concrete, such as C50 concrete, within the range of the UHPC node side form 2 to form a pouring node 14; Through the above steps, the construction of the prefabricated wharf structure is realized.

[0038] The above-mentioned embodiments are only preferred technical solutions of the present invention and should not be regarded as limitations of the present invention. The embodiments and features in the embodiments of the present application can be arbitrarily combined with each other without conflict. The protection scope of the present invention shall be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A composite beam assembled wharf structure, characterized by: It includes a UHPC composite node and a UHPC composite beam (1); The UHPC composite node comprises a UHPC adjustable bottom plate (5) and a UHPC node side form (2), the UHPC adjustable bottom plate (5) is sleeved on the pile foundation (3), the UHPC node side form (2) is vertically arranged on the UHPC adjustable bottom plate (5), and the UHPC node side form (2) is provided with a notch at a position corresponding to the UHPC composite beam (1) so as to allow the UHPC composite beam (1) to pass through; The UHPC composite beam (1) adopts a UHPC template (101). The cross section of the UHPC template (101) is in a "U" shape. A beam reinforcement cage (103) and beam casting concrete (102) are arranged inside the UHPC template (101).

2. The composite beam assembled wharf structure according to claim 1 is characterized in that: The UHPC adjustable bottom plate (5) and the UHPC node side form (2) are an integrated structure, and the UHPC node side form (2) is fixedly connected to the UHPC adjustable bottom plate (5).

3. The composite beam assembled wharf structure according to claim 1 is characterized in that: The UHPC adjustable bottom plate (5) and the UHPC node side form (2) are separate structures, and the UHPC node side form (2) is provided with a connecting plate at the position of the notch.

4. The composite beam assembled wharf structure according to claim 1 is characterized in that: A vertically arranged positioning steel section (10) is provided inside the pile foundation (3) and at the end of the UHPC composite beam (1), and the end of the steel bar of the UHPC composite beam (1) is connected to the positioning steel section (10); A horizontally arranged connecting steel (9) is also provided, and the connecting steel (9) connects the plurality of positioning steels (10) into one. The cavity between the UHPC node side formwork (2) and the UHPC composite beam (1) is filled with cast concrete.

5. The composite beam assembled wharf structure according to any one of claims 1 to 4, characterized in that: The outer wall of the pile foundation (3) is provided with a supporting bracket (17), the UHPC adjustable bottom plate (5) is divided into an upper platform (16) and a lower platform (12), the upper platform (16) and the lower platform (12) are sleeved on the pile foundation (3), and the reserved gap (11) between the upper platform (16) and the pile foundation (3) is larger than the gap between the lower platform (12) and the pile foundation (3); The reserved gap (11) is used to adjust the horizontal position of the upper platform (16).

6. The composite beam assembled wharf structure according to claim 5 is characterized in that: The upper platform (16) and the lower platform (12) are provided with mutually connected grooves (15), and UHPC is poured in the grooves (15).

7. The composite beam assembled wharf structure according to claim 6 is characterized by: An intelligent corbel (13) is also provided. The base (132) of the intelligent corbel (13) is fixedly connected to the pile foundation (3). A plurality of lifting devices (131) are provided on the edge of the base (132). The lifting devices (131) are supported on the edge of the lower platform (12) to assist in adjusting the elevation and levelness of the lower platform (12).

8. The composite beam assembled wharf structure according to claim 1 is characterized in that: UHPC includes the following components in mass ratio: P·Ⅰ52.5 Portland cement 1; lime powder 0.2~0.27; silica fume 0.05~0.1; graded quartz sand 1.3~1.5; polycarboxylic acid high-performance water reducer 0.015~0.018; The corrugated copper-plated steel fiber is added in 2% of the dry material volume; The grading parameters of graded quartz sand are as follows: the volume ratio of particle size d50-1mm accounts for 57%; particle size d50-0.5mm accounts for 25%; particle size d50-0.2mm accounts for 13%, and the remainder is 5%; The volume water-cement ratio is 0.

16.

9. A construction method for a composite beam assembled wharf structure according to any one of claims 1 to 8, characterized in that The following steps are involved: S1. Preparing UHPC composite beams in a factory (1); First, a UHPC formwork (101) is prepared using UHPC, then a beam reinforcement cage (103) is installed in the UHPC formwork (101), and beam casting concrete (102) is poured in the UHPC formwork (101); S2, installing a UHPC adjustable base plate (5) and a UHPC node side form (2) on the pile foundation (3); S3, hoisting the UHPC composite beam (1) onto the UHPC adjustable bottom plate (5), wherein the UHPC composite beam (1) is located at the notch position of the UHPC node side form (2); S4, vertically inserting part of the positioning steel into the pile foundation (3), connecting another part of the vertical positioning steel to the end steel bars of the UHPC composite beam (1), and connecting the positioning steels to each other with horizontal connecting steels (9); S5, pouring concrete within the range of the UHPC node side form (2) to form a pouring node (14); Through the above steps, the construction of the prefabricated wharf structure is realized.

10. The construction method of the composite beam assembled wharf structure according to claim 9 is characterized by: In step S2; S21, first installing the intelligent bracket (13) on the pile foundation (3), then placing the lower platform (12) on the supporting bracket (17) of the outer wall of the pile foundation (3), detecting the horizontal elevation position of the lower platform (12) by using a total station, the jacking device (131) of the intelligent bracket (13) first jacks up the lower platform (12) at the lowest position to a preset elevation, and the other jacking devices (131) of the intelligent bracket (13) jack up the lower platform (12) to a preset elevation; S22, providing a pad between the lower platform (12) and the supporting corbel (17); S23, installing the upper platform (16), and adjusting the position of the upper platform (16) according to the designed position level; S24. Pour UHPC concrete into the groove (15) between the upper platform (16) and the lower platform (12).

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