Pi-shaped steel-concrete composite beam poured by micro paver and construction method

Abstract

The invention provides a pi-shaped steel-concrete composite beam poured by a micro paver and a construction method. A pi-shaped steel-concrete composite beam bridge deck slab is poured in a layered mode, bottom layer concrete is poured in a large amount firstly, then top layer concrete is poured and paved in a small amount by the micro paver, a next section is trowelled after longitudinal movement every time a section is trowelled, and circulation construction is conducted; by presetting the pre-camber of the longitudinal beam and the gradient of the cross beam, the micro paver moves along the cross beam, the whole cross beam moves along the longitudinal beam, and the longitudinal and transverse slope ratios of the bridge deck concrete are controlled through the pre-camber of the longitudinal beam and the gradient of the cross beam, so that errors caused by manual operation are avoided, the construction efficiency is improved, and the gradient quality of the bridge deck is ensured.

Description

Technical Field

[0001] The invention relates to the field of concrete pouring construction of π-shaped steel-concrete composite beams, and in particular to a micro-paver pouring π-shaped steel-concrete composite beam and a construction method. Background Art

[0002] Steel structure and concrete structure are the two most commonly used structures in civil engineering, and steel-concrete composite structure is developed on the basis of these two structures. Steel-concrete composite structure can make full use of the characteristics of steel and concrete materials, give full play to the excellent tensile properties of steel and the good compressive properties of concrete, and have the advantages of both steel and concrete structures in many aspects such as mechanical properties, construction performance and economy. The π-shaped steel-concrete composite beam consists of two I-beams, a middle crossbeam and a concrete bridge deck. Due to the needs of the site, the π-shaped steel-concrete composite beam bridge deck is often made with a certain slope in the longitudinal and transverse directions. The following problems exist in the traditional casting process:

[0003] (1) The π-shaped steel-concrete composite beam bridge deck is directly cast using a large-volume hopper and then manually smoothed. The manual smoothing and finishing work has low efficiency. (2) Since the designed π-shaped steel-concrete composite beam has a certain slope in the longitudinal and transverse directions, manual finishing cannot accurately meet the slope requirements, resulting in large errors and difficult to ensure quality. Summary of the invention

[0004] The object of the present invention is to provide a micro-paver for casting π-shaped steel-concrete composite beams and a construction method for solving the above-mentioned technical problems.

[0005] In order to solve the above technical problems, the present invention provides a construction method for casting π-shaped steel-concrete composite beams by a micro-paver, comprising the following steps:

[0006] Step 1: Preliminary construction: Cast the beam pedestal, process the frame beam as a whole to make it high in the middle and low on both sides, assemble the steel main beam on the beam pedestal, connect multiple sets of shear nails on the top of the steel main beam, set up a bracket, lay the π beam bottom formwork on the steel main beam and the upper side of the bracket, and support the side formwork;

[0007] Step 2, column installation: columns are evenly spaced on the upper part of the bracket, the length of the columns at both ends in the longitudinal direction is shorter than the length of the column in the middle, and the lengths of several columns increase or decrease in sequence in the longitudinal direction, and diagonal braces are set between adjacent columns;

[0008] Step 3: Install the longitudinal beam: Connect the longitudinal beam to the top of several columns. A track groove is provided on the top of the longitudinal beam. The longitudinal beam has a slope that is high in the middle and low at both ends.

[0009] Step 4: Frame beam installation: Rotate and install steel wheels at the bottom of both sides of the frame beam, hoist the frame beam as a whole to the top of the longitudinal beam, and embed the steel wheels into the track groove;

[0010] Step 5: Install the micro paver: Hang the micro paver on the frame beam, install a vibrating scraper at the bottom of the micro paver, and re-measure the transverse slope of the frame beam;

[0011] Step 6: Pouring of bottom concrete: Tie up the steel bars of the π-shaped steel-concrete composite beam, set up a large-scale material hopper, and pour the bottom concrete with large-scale materials;

[0012] Step 7: Top concrete pouring: After the bottom concrete pouring is completed, the top concrete is poured by a micro paver. The micro paver uses a vibrating scraper to level the concrete while pouring it. The micro paver moves horizontally along the frame beam.

[0013] Step 8. Move the frame beam longitudinally: After the top concrete of a section is completed, the frame beam drives the micro paver to move longitudinally along the longitudinal beam to the next section, and the micro paver pours and spreads the top concrete according to step 7;

[0014] Step 9: Circular construction: Follow the circular construction of step 8, and move the frame beam from one end of the longitudinal beam to the other end, so that the top concrete arches in the longitudinal mid-span position;

[0015] Step 10: Concrete curing: After the top layer of concrete is poured, lift and remove the frame beam together with the micro-paver as a whole, cover the concrete surface with a protective film, and sprinkle water for curing to complete the concrete pouring construction of a π-shaped steel-concrete composite beam.

[0016] The beneficial effects of the present invention are:

[0017] 1. The π-shaped steel-concrete composite beam bridge deck of the present invention is cast in two layers. First, a large-volume hopper is used to cast the bottom layer of concrete, and then a micro-paver is used to cast the top layer of concrete. The micro-paver casts and smoothes the concrete at the same time. After smoothing a section, it moves longitudinally and then smoothes the next section. The construction is cyclical, which improves the construction efficiency and ensures the slope quality of the bridge deck.

[0018] 2. The present invention presets the pre-arch of the longitudinal beam and the slope of the cross beam. The micro paver moves along the cross beam, and the cross beam as a whole moves along the longitudinal beam. The longitudinal and transverse slopes of the bridge deck concrete are controlled by the pre-arch of the longitudinal beam and the slope of the cross beam, thereby avoiding errors caused by human operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of the layered pouring and paving of concrete for the π-shaped steel-concrete composite beam bridge deck of the present invention;

[0020] Figure 2 It is an enlarged view of the connection between the steel wheel at the end of the frame cross beam and the longitudinal beam track groove of the present invention;

[0021] Figure 3This is a longitudinal segmented pouring and paving diagram of the top concrete layer of the π-shaped steel-concrete composite beam bridge deck of the present invention;

[0022] Figure 4 This is a partial enlarged view of the longitudinal segmented pouring and paving of the top concrete of the π-shaped steel-concrete composite beam bridge deck of the present invention ( Figure 3 Partial enlarged image);

[0023] Figure 5 It is a plan view of the frame beam-micro paver of the present invention;

[0024] Figure 6 This is a three-dimensional structural diagram of the frame beam-micro paver of the present invention;

[0025] Figure 7 It is an enlarged view of the structural details of the end of the frame cross beam of the present invention;

[0026] Figure 8 It is a partial enlarged view of the connection between the frame crossbeam and the micro-paver of the present invention;

[0027] Among them: 1-steel main beam; 2-beam making base; 3-jack; 4-bracket; 5-π beam bottom formwork; 6-side formwork; 7-column; 8-longitudinal beam; 9-track groove; 10-driving motor; 11-steel wheel; 12-frame crossbeam; 13-bottom concrete; 14-top concrete; 15-mini paver; 16-telescopic frame; 17-vibrating scraper; 18-coupling shaft; 19-transverse track; 20-auxiliary machine wheel. DETAILED DESCRIPTION

[0028] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0029] Those skilled in the art should understand that, in the disclosure of the present invention, the orientation or position relationship indicated by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0030] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0031] like Figure 1-Figure 8 The present invention provides a construction method for casting a π-shaped steel-concrete composite beam using a micro-paver, comprising the following steps:

[0032] Step 1, preliminary construction: cast the beam pedestal 2 according to the designed position, and process and manufacture the steel main beam 1, longitudinal beam 8, and frame beam 12 in the factory in advance. The frame beam 12 is processed as a whole, with a high middle and low sides. The transverse slope of the frame beam 12 is set to 2%. The steel main beam 1 is welded and assembled on the beam pedestal 2 at the construction site, and multiple groups of shear nails are welded on the top of the steel main beam 1. The bracket 4 is erected according to the designed height and position, and the π beam bottom formwork 5 is laid on the upper side of the steel main beam 1 and the bracket 4 in turn, and the side formwork 6 is supported.

[0033] Step 2, column installation: Weld columns 7 at uniform intervals on the upper part of the bracket 4. The length of the columns 7 is determined according to the longitudinal length of the π-shaped steel-concrete composite beam. The length of the columns 7 at both ends of the longitudinal direction is shorter than the length of the column 7 at the middle position of the longitudinal direction, and the lengths of several columns 7 increase or decrease successively along the longitudinal direction. The column 7 at the middle position of the longitudinal direction is 50mm longer than the columns 7 at both ends of the longitudinal direction. The uniform spacing between adjacent columns 7 is 1.5-2m, and diagonal braces are set between adjacent columns 7 for reinforcement.

[0034] Step 3, longitudinal beam installation: weld the longitudinal beam 8 manufactured and processed in advance to the top of several columns 7, and set a track groove 9 on the top of the longitudinal beam 8. The longitudinal beam 8 has a slope with high middle and low ends in the longitudinal direction, and the mid-span of the longitudinal beam 8 is set to a pre-arch height of 50mm.

[0035] Step 4, frame beam installation: install steel wheels 11 at the bottom of both sides of the integral frame beam 12, install and fix the drive motor 10 at the end of the frame beam 12, connect the steel wheel 11 and the drive motor 10 through the connecting shaft 18, check whether the drive motor 10 can drive the steel wheel 11 to rotate normally, after the inspection is correct, hoist the frame beam 12 as a whole to the top of the longitudinal beam 8, and embed the steel wheel 11 into the track groove 9.

[0036] Step 5. Install the micro paver: hang the micro paver 15 on the frame beam 12, embed the machine wheel 20 into the transverse track 19 on the top of the frame beam 12, and after the telescopic frame rod 16 passes through the middle cavity of the frame beam 12, install the vibrating scraper 17 at the bottom of the telescopic frame rod 16 to check whether the micro paver 15 can move horizontally on the frame beam 12 normally, and re-measure whether the transverse slope of the frame beam 12 is 2%.

[0037] Step 6. Pouring of bottom concrete: Tie up the steel bars of the π-shaped steel-concrete composite beam. The beam steel bars must be staggered with the shear nails. The two can be welded. Set up a large-scale material hopper and pour the bottom concrete 13 with large-scale materials. The pouring height of the bottom concrete 13 should be up to the designed concrete bridge deck height, leaving 15 cm.

[0038] Step 7, pouring of top concrete: After the bottom concrete 13 is poured, the large measuring hopper is quickly removed within 15 minutes, and the top concrete 14 is poured by the micro paver 15. The micro paver 15 uses a vibrating scraper 17 to level the concrete while pouring it. The micro paver 15 moves laterally along the frame beam 12 to keep the horizontal leveling slope of the top concrete 14 at 2%.

[0039] Step 8. Move the frame beam longitudinally: After completing the top layer of concrete 14 of a section, start the drive motor 10, so that the entire frame beam 12 drives the micro paver 15 to move longitudinally along the longitudinal beam 8. After moving to the next section, the micro paver 15 pours and spreads the top layer of concrete 14 according to the same process as step seven.

[0040] Step 9, cyclic construction: Carry out the construction cyclically according to step 8, and move the entire frame cross beam 12 from one end of the longitudinal beam 8 to the other end, so that the top layer of concrete 14 is arched at the longitudinal mid-span position, and the arch height is 50mm.

[0041] Step 10, concrete curing: After the top concrete 14 is poured, the frame beam 12 together with the micro-paver 15 is hoisted and removed as a whole, the concrete surface is covered with a protective film, and water is sprinkled for curing, thus completing the concrete pouring construction of a π-shaped steel-concrete composite beam.

[0042] like Figure 1 The π-shaped steel-concrete composite beam bridge deck concrete layered pouring and paving structure diagram shown includes a bottom layer of concrete 13, a top layer of concrete 14, a micro paver 15, etc. The π-shaped steel-concrete composite beam is poured in layers. The bottom layer of concrete 13 is poured in large quantities first. The bottom layer of concrete 13 is poured using a large-volume hopper, and then the top layer of concrete 14 is poured in small quantities. The top layer of concrete 14 is poured and paved using a micro paver 15. The top layer of concrete 14 has a horizontal slope that is high in the middle and low on both sides, with a slope of 2%. The pouring thickness of the top layer of concrete 14 is 5-15cm.

[0043] like Figure 2-4 The diagram of the longitudinal segmented pouring and paving of the top layer of concrete of the π-shaped steel-concrete composite beam bridge deck shown in the figure includes a bracket 4, a column 7, a longitudinal beam 8, and a track groove 9. The columns 7 are welded at even intervals on the upper part of the bracket 4, and the longitudinal beam 8 is welded on the column 7. The longitudinal beam 8 is high in the middle and low on both sides, and the longitudinal slope is set to a pre-arch height of 50 mm in the mid-span. The longitudinal slope of the longitudinal beam 8 is determined according to its length, and a track groove 9 is set on the top of the longitudinal beam 8.

[0044] like Figure 5-7 The frame beam-micro paver structure diagram shown includes a longitudinal beam 8, a track groove 9, a drive motor 10, a steel wheel 11, a frame beam 12, a connecting shaft 18, a transverse track 19, a machine wheel 20, etc. The frame beam 12 is an integral standardized frame structure, which is high in the middle and low on both sides, with a slope of 2%; drive motors 10 are arranged on both sides of the frame beam 12, and steel wheels 11 are arranged on the bottom of both sides of the frame beam 12. The steel wheels 11 are connected to the drive motor 10 through the connecting shaft 18, and the steel wheels 11 are embedded in the track groove 9 at the top of the longitudinal beam 8. Under the driving action of the drive motor 10, the steel wheel 11 moves longitudinally along the track groove 9 at the top of the longitudinal beam 8, thereby driving the entire frame beam 12 to move longitudinally.

[0045] like Figure 8 The enlarged partial view of the frame beam-micro paver connection shown includes a frame beam 12, a top layer of concrete 14, a micro paver 15, a telescopic frame rod 16, a vibrating scraper 17, a transverse track 19, a wheel 20, etc. The transverse track 19 is arranged on the frame beam 12, and the wheel 20 of the micro paver 15 is embedded in the transverse track 19. The micro paver 15 can move laterally along the transverse track 19. The telescopic frame rod 16 at the lower part of the micro paver 15 passes through the middle cavity of the frame beam 12 and is connected to the vibrating scraper 17. The top layer of concrete 14 is scraped flat by the vibrating scraper 17 to maintain the slope.

[0046] like Figure 1 , 3 The π-type steel-concrete composite beam bridge deck concrete layered pouring and paving structure shown in the figure includes a longitudinal beam 8, a frame cross beam 12, a top layer of concrete 14, etc. Since the longitudinal slope of the longitudinal beam 8 is set to a pre-arch height of 50mm in the mid-span, the longitudinal mid-span of the top layer of concrete 14 is 50mm higher than the two sides; since the transverse slope of the frame cross beam 12 is 2%, the transverse slope of the top layer of concrete 14 is 2%.

[0047] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present invention.

Claims

1. A construction method for casting π-shaped steel-concrete composite beams using a micro-paver, characterized in that: The following steps are involved: Step 1, pre-construction: pouring the beam-making pedestal (2), processing the frame crossbeam (12) as a whole to present a high middle and low sides, assembling the steel main beam (1) on the beam-making pedestal (2), connecting multiple groups of shear nails on the top of the steel main beam (1), and setting up a bracket (4), laying the π beam bottom formwork (5) on the upper side of the steel main beam (1) and the bracket (4), and supporting the side formwork (6); Step 2, column installation: columns (7) are evenly spaced on the upper part of the bracket (4), the length of the columns (7) at the two ends in the longitudinal direction is shorter than the length of the column (7) in the middle, and the lengths of the columns (7) increase or decrease in sequence in the longitudinal direction, and diagonal braces are arranged between adjacent columns (7); Step 3, longitudinal beam installation: connect the longitudinal beam (8) to the top of a plurality of columns (7), a track groove (9) is provided on the top of the longitudinal beam (8), and the longitudinal beam (8) has a slope that is high in the middle and low at both ends in the longitudinal direction; Step 4: Installation of the frame crossbeam: The steel wheels (11) are rotated and installed at the bottom of both sides of the frame crossbeam (12), and the frame crossbeam (12) is hoisted as a whole to the top of the longitudinal beam (8), and the steel wheels (11) are embedded in the track groove (9); Step 5: Install the micro-paver: hang the micro-paver (15) on the frame beam (12), install a vibrating scraper (17) at the bottom of the micro-paver (15), and re-measure the transverse slope of the frame beam (12); Step 6: pouring bottom concrete: tying the steel bars of the π-shaped steel-concrete composite beam, setting up a large-scale material hopper, and pouring the bottom concrete with large-scale materials (13); Step 7, pouring the top layer of concrete: after the bottom layer of concrete (13) is poured, the top layer of concrete (14) is poured by a micro-paver (15), the micro-paver (15) uses a vibrating scraper (17) to level the concrete while pouring it, and the micro-paver (15) moves laterally along the frame beam (12); Step 8, longitudinally moving the frame crossbeam: After the top concrete (14) of a section is completed, the frame crossbeam (12) drives the micro-paver (15) to move longitudinally along the longitudinal beam (8) to the next section, and the micro-paver (15) pours and spreads the top concrete (14) according to step 7; Step 9, cyclic construction: cyclic construction is carried out according to step 8, the frame cross beam (12) is moved from one end of the longitudinal beam (8) to the other end, so that the top concrete (14) is arched at the longitudinal mid-span position; Step 10, concrete curing: After the top concrete (14) is poured, the frame beam (12) together with the micro-paver (15) is hoisted and removed as a whole, the concrete surface is covered with a protective film, and water is sprinkled for curing, thus completing the concrete pouring construction of a π-shaped steel-concrete composite beam.

2. The construction method of casting π-shaped steel-concrete composite beam by a micro-paver according to claim 1 is characterized in that: In step 4, a drive motor (10) is installed at the end of the frame cross beam (12), and the steel wheel (11) is connected to the drive motor (10) via a coupling shaft (18).

3. The construction method for casting π-shaped steel-concrete composite beams by a micro-paver according to claim 1 is characterized in that: In step five, the wheel (20) of the micro-paving machine (15) is embedded in the transverse track (19) at the top of the frame beam (12), and the lower side of the micro-paving machine (15) is connected with a telescopic frame rod (16). After the telescopic frame rod (16) passes through the middle cavity of the frame beam (12), a vibrating scraper (17) is installed at the lower part of the telescopic frame rod (16).

4. The construction method for casting π-shaped steel-concrete composite beams by a micro-paver according to claim 1 is characterized in that: In step 1, the transverse slope of the frame beam (12) is set to 2%.

5. The construction method for casting π-shaped steel-concrete composite beams by a micro-paver according to claim 1 is characterized in that: In step 2, the vertical column (7) in the middle is 50 mm longer than the vertical columns (7) at both ends, and the adjacent columns (7) are evenly spaced at a distance of 1.5-2 m.

6. The construction method for casting π-shaped steel-concrete composite beams by a micro-paver according to claim 1 is characterized in that: In step 3, the longitudinal beam (8) is set to have a pre-camber height of 50 mm at the mid-span.

7. The construction method for casting π-shaped steel-concrete composite beams by a micro-paver according to claim 1 is characterized in that: In step seven, the top layer of concrete (14) has a slope in the horizontal direction that is high in the middle and low on both sides, with a slope rate of 2%. The pouring thickness of the top layer of concrete (14) is 5-15 cm.

8. A micro paver for casting π-shaped steel-concrete composite beam, characterized in that: It is obtained by the construction method of casting π-shaped steel-concrete composite beams using a micro-paver according to any one of claims 1-7.

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