A steel transfer beam for large height difference slope and its construction method

Abstract

The present invention relates to a steel conversion beam for a large height difference slope, comprising a plurality of reinforced concrete piles arranged side by side, the upper parts of the reinforced concrete piles are respectively anchored with corresponding steel columns, the steel columns are formed by back-to-back fixing of long channel steel and short channel steel, the top two sides of the long channel steel are cut into an inclined shape; corresponding steel beams are respectively fixed between two adjacent reinforced concrete piles, and the steel beams are respectively positioned and locked to the corresponding short channel steels after the corresponding first pair of locking bolts penetrate the connecting holes of the steel beams and the locking bolt holes of the short channel steels; the two ends of the steel beams are respectively cut into an inclined shape matching the top of the long channel steel, and the two ends of the steel beams are respectively welded to the top end of the long channel steel. The present invention can effectively and significantly improve the connection stability between the steel column and the steel beam, and the connection stability between two adjacent steel beams; and can effectively and significantly improve the construction efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of building engineering construction, and in particular to a steel transfer beam used for a slope with a large height difference and a construction method thereof. Background Art

[0002] With the development of urban construction, the intensity of land development is increasing. In order to improve the utilization rate of land, more and more buildings will be built in narrow spaces, locations with complex terrain conditions such as large elevation differences. In order to meet the use requirements of the structure under complex terrain conditions with large elevation differences, the traditional construction method is used. After the site earthwork is excavated to the corresponding elevation position, the foundation pedestal and supporting columns are constructed before the upper structure can be constructed. This method has a long construction period, and the construction of the upper structure is too dependent on the progress of earthwork excavation, which will inevitably cause delays in the construction period, increased investment in manpower and material resources, and increased construction costs.

[0003] In order to solve the problem that mountain construction under large height difference slope terrain is too dependent on the site excavation progress, some companies have begun to use steel transfer beam cantilever support structure in sites with large height difference to carry out reverse construction of buildings. The foundation beam adopts the form of transfer beam steel frame, the superstructure is constructed first, and the earthwork is excavated after the superstructure construction is completed, forming a reverse construction method. The cantilever steel concrete structure formed by reverse excavation bears the load generated by the superstructure, which can ensure the overall stability of the structure. This method effectively solves the problem of difficult excavation under large height difference slopes, saves construction time and construction costs.

[0004] The existing steel transfer beams have the following defects in actual construction and use: 1) The welds between the steel columns and the steel beams are generally required to be set horizontally. Affected by various factors in the construction process, the steel columns and the steel beams are generally unable to be completely vertical and horizontal, which makes it difficult to achieve completely horizontal welding between the steel columns and the steel beams. Under high stress conditions, cracks are prone to appear in the connection between the steel beams and the steel columns, and even break in severe cases; 2) The depth of the steel column anchored in the reinforced concrete pile is limited. When the force from the steel beam is transferred to the reinforced concrete pile through the steel column, stress concentration is easily formed at the bottom of the steel column, resulting in the hidden danger of cracking of the reinforced concrete pile near the bottom of the steel column; 3) Due to the length limitation of steel beams, as well as the site limitations of lifting equipment and construction sites, steel beams need to be disconnected and spliced. The existing steel beam welding is generally performed directly on two adjacent steel beams. The welds of two adjacent steel beams are prone to cracking when subjected to excessive stress; 4) For controllability during construction, the weld between two adjacent steel beams must not overlap with the weld of the steel column. The two welds must be staggered. During the welding process, the lifting equipment must not be removed. The lifting equipment can only be released after the welding of the steel beam and the steel column is completed, and the welding between two adjacent steel columns is completed. This causes the lifting equipment to be occupied for a long time, greatly reducing construction efficiency.

[0005] Therefore, the purpose of the present invention is to develop a steel conversion beam and its construction method for large height difference slopes that can effectively and significantly improve the connection stability between steel columns and steel beams, as well as the connection stability between two adjacent steel beams, and can effectively reduce the occupancy time of lifting equipment during construction, effectively improve the utilization rate of lifting equipment, and thus effectively and significantly improve the construction efficiency, through the improvement of the overall structure and the improvement of adaptability during the construction process. Summary of the invention

[0006] In view of the technical problems existing in the above-mentioned prior art, the present invention provides a steel conversion beam for large height difference slopes and a construction method thereof, which can effectively solve the technical problems existing in the above-mentioned prior art.

[0007] The technical solution of the present invention is:

[0008] A steel transfer beam for a slope with a large height difference comprises a plurality of reinforced concrete piles arranged side by side.

[0009] The upper part of the reinforced concrete pile is anchored with corresponding steel columns, each of which is formed by long channel steel and short channel steel connected back to back, and the tops of the long channel steel and the short channel steel are flush and extend upward to the outside of the reinforced concrete pile;

[0010] The top two sides of the long channel steel are cut into an inclined shape, and the two sides of the short channel steel are respectively provided with at least one locking bolt hole at a position corresponding to the cut portion of the long channel steel;

[0011] A corresponding steel beam is fixedly connected between two adjacent reinforced concrete piles, and corresponding communication holes are respectively provided at both ends of the steel beam at positions corresponding to the locking bolt holes, and the steel beam is positioned and locked to the corresponding short channel steel after the corresponding first pair of locking bolts penetrate the communication holes and the locking bolt holes;

[0012] The two ends of the steel beam are respectively cut into an inclined shape matching the top of the long channel steel, and the two ends of the steel beam are respectively welded to the top end of the long channel steel;

[0013] The periphery of the steel beam is evenly welded and tied with corresponding steel bars, and the periphery of the steel beam and the steel bars is covered with a concrete layer;

[0014] The bottom of the long channel steel is located below the bottom of the short channel steel, and the bottom of the long channel steel and the bottom of the short channel steel are both arranged in an arc shape;

[0015] A plurality of rows of corresponding studs are welded side by side on the surface of the steel beam, and the spacing between two adjacent rows of studs is gradually increased by 2 mm from both sides to the middle of the steel beam.

[0016] The bolt has a diameter of not less than 19 mm and a length of not less than 80 mm.

[0017] The portion of the long channel steel anchored in the reinforced concrete pile is not less than 1.5m, and the portion of the short channel steel anchored in the reinforced concrete pile is not less than 1.2m.

[0018] The steel beam is made of T-shaped steel, and the tops of two adjacent steel beams are welded and fixed to form a whole.

[0019] The long channel steel and the short channel steel are locked by a plurality of corresponding second pairs of locking bolts, and the edges of the long channel steel and the short channel steel are welded to form a whole.

[0020] A construction method for a steel transfer beam for a slope with a large height difference, the specific steps are as follows:

[0021] 1) Perform inclined trimming on the top of the long channel steel;

[0022] 2) Connect the long channel steel with the top trimmed edge to the short channel steel through the second pair of locking bolts, and weld the edges of the long channel steel and the short channel steel;

[0023] 3) After the reinforced concrete piles are cast on site, long and short channel steels are anchored and installed at the top of the reinforced concrete piles;

[0024] 4) Trim the two ends of the steel beam and weld multiple studs to the corresponding positions of the steel beam according to the design requirements;

[0025] 5) Use the hoisting equipment to hoist the steel beams with trimmed edges at both ends between the long channel steels of two adjacent reinforced concrete piles, so that the beveled edge of the steel beam abuts against the trimmed edge of the long channel steel;

[0026] 6) Use the first pair of locking bolts to lock the two ends of the steel beam to the back of the short channel steel. With the support of the long channel steel and the fixation of the short channel steel, the lifting equipment can be released;

[0027] 7) Weld the beveled edges of the two ends of the steel beam to the beveled edges of the long channel steel respectively;

[0028] 8) Weld and tie the steel bars on the outside of the steel beam;

[0029] 9) Build formwork outside the steel beams and steel bars;

[0030] 10) Pour the concrete layer in the space formed by the formwork, remove the formwork after routine maintenance, and complete the construction of the steel transfer beam for the large height difference slope.

[0031] In the step 7), the welds between the steel beam and the long channel steel are full penetration groove welds, and the welds are required to be double-sided welded.

[0032] In the step 8), the contact part between the steel bar and the steel beam must be cut off and separated and welded to the steel beam. The welding can be done by single-sided welding, and the welding length is not less than 10d.

[0033] Advantages of the present invention:

[0034] 1) The steel columns of the present invention are formed by back-to-back fixing of long channel steel and short channel steel. The tops of the long channel steel and the short channel steel are flush and extend upward to the outside of the reinforced concrete pile. The tops of the long channel steel are cut into inclined shapes on both sides. The two ends of the steel beam are respectively cut into inclined shapes that match the tops of the long channel steel, and the two ends of the steel beam are respectively welded to the tops of the long channel steel.

[0035] The traditional horizontal welding between steel columns and steel beams, and the vertical welding between two adjacent steel beams are modified into symmetrical inclined welding between two steel beams and the two sides of the steel column. During use, the force of the steel beam is transferred to the steel column along the miter joint between it and the steel column, and the force is decomposed into downward vertical force and inward horizontal force. The downward vertical force is transferred from the steel column to the reinforced concrete pile, while the inward horizontal force is balanced and offset by each other, and forms an interlocking effect. When the force on one side of the steel beam is large, the steel beam on the other side can be used to offset and disperse its force, effectively and significantly improving the connection stability between the steel column and the steel beam, and the connection stability between two adjacent steel beams.

[0036] 2) At least one locking bolt hole is respectively provided on both sides of the short channel steel of the present invention at a position corresponding to the cut portion of the long channel steel, and the corresponding first pair of locking bolts penetrate the connecting hole and the locking bolt hole of the steel beam to position and lock the steel beam to the corresponding short channel steel. On the basis of welding, the steel beam is synchronously fixed to the short channel steel by bolt connection, and the stress of the steel beam is further dispersed by the short channel steel, and the stress is transferred to the reinforced concrete pile by the short channel steel itself, thereby effectively further improving the connection stability between the steel column and the steel beam, and the connection stability between two adjacent steel beams.

[0037] 3) The bottom of the long channel steel of the present invention is located below the bottom of the short channel steel, and the bottom of the long channel steel and the bottom of the short channel steel are both arranged in an arc shape. By setting the height difference, the force from the steel beam is effectively dispersed and transferred to different parts of the reinforced concrete pile, preventing excessive stress concentration, thereby preventing the reinforced concrete pile from cracking and other problems, and further improving the use stability of the present invention.

[0038] 4) The surface of the steel beam of the present invention is welded with multiple rows of corresponding studs in parallel, and the spacing between two adjacent rows of studs is gradually increased by 2 mm from both sides to the middle of the steel beam. The present invention improves the structure so that the ends of the steel beam can be welded to the steel columns respectively, so the bearing capacity of the steel beam is weakened from both ends to the middle. The present invention effectively ensures the bearing capacity of the cantilever structure in the middle of the steel beam by adjusting the arrangement density of the studs, thereby effectively further improving the use stability of the present invention.

[0039] 5) During the construction process of the present invention, the steel beams with trimmed ends can be hoisted between the long channel steels of two adjacent reinforced concrete piles by hoisting equipment, so that the beveled portion of the steel beam rests against the trimmed portion of the long channel steel; and the two ends of the steel beam are respectively locked to the back of the short channel steel by a first pair of locking bolts. With the support of the long channel steel and the fixation of the short channel steel, the hoisting of the hoisting equipment can be released; and then the beveled portions at both ends of the steel beam can be welded to the beveled portions of the long channel steel. During the welding process, the hoisting equipment can be transferred to other workstations for further hoisting operations, and hoisting and welding operations can be performed simultaneously at different workstations, thereby effectively improving the conversion rate of the hoisting equipment and effectively and significantly improving the construction efficiency of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the structure of the present invention.

[0041] Figure 2 It is a structural schematic diagram of the steel column of the present invention.

[0042] Figure 3 It is a front view of the steel column of the present invention.

[0043] Figure 4 It is a rear view of the steel column of the present invention. DETAILED DESCRIPTION

[0044] In order to facilitate understanding by those skilled in the art, the structure of the present invention is further described in detail with reference to the embodiments in conjunction with the accompanying drawings:

[0045] refer to Figure 1-4 A steel transfer beam for a slope with a large height difference comprises a plurality of reinforced concrete piles 1 arranged side by side.

[0046] The upper part of the reinforced concrete pile 1 is anchored with corresponding steel columns 2, each of which is formed by a long channel steel 201 and a short channel steel 202 fixed back to back, and the tops of the long channel steel 201 and the short channel steel 202 are flush with each other and extend upward to the outside of the reinforced concrete pile 1;

[0047] The top two sides of the long channel steel 201 are cut into an inclined shape, and two locking bolt holes are respectively provided on both sides of the short channel steel 202 at positions corresponding to the cut parts of the long channel steel;

[0048] A corresponding steel beam 3 is fixedly connected between two adjacent reinforced concrete piles 1, and corresponding connecting holes are respectively provided at both ends of the steel beam 3 at positions corresponding to the locking bolt holes, and the steel beam 3 is respectively positioned and locked to the corresponding short channel steel 202 after the corresponding first pair of locking bolts 4 penetrate the connecting holes and the locking bolt holes;

[0049] The two ends of the steel beam 3 are respectively cut into an inclined shape matching the top of the long channel steel 201, and the two ends of the steel beam 3 are respectively welded to the top end of the long channel steel 201;

[0050] The outer periphery of the steel beam 3 is evenly welded and tied with corresponding steel bars 5, and the outer periphery of the steel beam 3 and the steel bars 5 is covered with a concrete layer 6;

[0051] The bottom of the long channel steel 201 is located below the bottom of the short channel steel 202, and the bottom of the long channel steel 201 and the bottom of the short channel steel 202 are both arranged in an arc shape;

[0052] A plurality of rows of corresponding studs 7 are welded side by side on the surface of the steel beam 3 , and the spacing between two adjacent rows of studs 7 is gradually increased by 2 mm from both sides to the middle of the steel beam 3 .

[0053] The bolt 7 has a diameter of 19 mm and a length of 80 mm.

[0054] The portion of the long channel steel 201 anchored in the reinforced concrete pile 1 is 1.8 m, and the portion of the short channel steel 202 anchored in the reinforced concrete pile 1 is 1.3 m.

[0055] The steel beam 3 is made of T-shaped steel, and the tops of two adjacent steel beams 3 are welded and fixed to each other to form a whole.

[0056] The long channel steel 201 and the short channel steel 202 are locked by a plurality of corresponding second pairs of locking bolts 8, and the edges of the long channel steel 201 and the short channel steel 202 are welded to form a whole.

[0057] A construction method for a steel transfer beam for a slope with a large height difference, the specific steps are as follows:

[0058] 1) Performing an inclined trimming process on the top of the long channel steel 201;

[0059] 2) Connect the long channel steel 201 with the top trimmed to the short channel steel 202 through the second pair of locking bolts 8, and perform welding operations on the edges of the long channel steel 201 and the short channel steel 202;

[0060] 3) The reinforced concrete pile 1 is cast on site. After the reinforced concrete pile 1 is cast, the long channel steel 201 and the short channel steel 202 are anchored and installed at the top of the reinforced concrete pile 1;

[0061] 4) trimming the two ends of the steel beam 3, and welding a plurality of studs 7 to corresponding positions of the steel beam 3 according to design requirements;

[0062] 5) The steel beam 3 with trimmed edges at both ends is hoisted between the long channel steels 201 of two adjacent reinforced concrete piles 1 by hoisting equipment, so that the beveled edge of the steel beam 3 abuts against the trimmed edge of the long channel steel 201;

[0063] 6) The two ends of the steel beam 3 are respectively locked to the back of the short channel steel 202 by the first pair of locking bolts 4. Under the support of the long channel steel 201 and the fixation of the short channel steel 202, the lifting of the lifting equipment can be released;

[0064] 7) The beveled edges of the two ends of the steel beam 3 are welded to the beveled edges of the long channel steel 201 respectively. The welds between the steel beam 3 and the long channel steel 201 are full penetration groove welds, and the welds are required to be double-sided welded;

[0065] 8) Weld and tie the steel bars 5 on the outside of the steel beam 3. The contact part between the steel bars 5 and the steel beam 3 must be cut off and separated and welded to the steel beam. Single-sided welding can be used, and the welding length is not less than 10d;

[0066] 9) Building formwork outside the steel beam 3 and the steel bars 5;

[0067] 10) Concrete layer 6 is poured in the space formed by the formwork, and the formwork is removed after conventional curing, completing the construction of the steel transfer beam for the large height difference slope.

[0068] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A steel transfer beam for a slope with a large height difference, comprising a plurality of reinforced concrete piles (1) arranged side by side, characterized in that: The upper part of the reinforced concrete pile (1) is respectively anchored with a corresponding steel column (2), and the steel column (2) is formed by a long channel steel (201) and a short channel steel (202) fixed back to back, and the tops of the long channel steel (201) and the short channel steel (202) are flush with each other and extend upward to the outside of the reinforced concrete pile (1); Both sides of the top of the long channel steel (201) are cut into an inclined shape, and both sides of the short channel steel (202) are respectively provided with at least one locking bolt hole at a position corresponding to the cut portion of the long channel steel; A corresponding steel beam (3) is fixedly connected between two adjacent reinforced concrete piles (1), and corresponding communication holes are respectively provided at both ends of the steel beam (3) at positions corresponding to the locking bolt holes, and the steel beam (3) is respectively positioned and locked onto the corresponding short channel steel (202) after a corresponding first pair of locking bolts (4) penetrate the communication holes and the locking bolt holes; The two ends of the steel beam (3) are respectively cut into an inclined shape matching the top of the long channel steel (201), and the two end portions of the steel beam (3) are respectively welded to the top end of the long channel steel (201); The outer periphery of the steel beam (3) is uniformly welded and tied with corresponding steel bars (5), and the outer periphery of the steel beam (3) and the steel bars (5) is covered with a concrete layer (6); The bottom of the long channel steel (201) is located below the bottom of the short channel steel (202), and the bottom of the long channel steel (201) and the bottom of the short channel steel (202) are both arranged in an arc shape; A plurality of rows of corresponding studs (7) are welded side by side on the surface of the steel beam (3), and the spacing between two adjacent rows of studs (7) is gradually increased by 2 mm from both sides to the middle of the steel beam (3); The bolt (7) has a diameter of not less than 19 mm and a length of not less than 80 mm; The portion of the long channel steel (201) anchored in the reinforced concrete pile (1) is not less than 1.5 m, and the portion of the short channel steel (202) anchored in the reinforced concrete pile (1) is not less than 1.2 m.

2. The steel transfer beam for large height difference slope according to claim 1, characterized in that: The steel beams (3) are made of T-shaped steel, and the tops of two adjacent steel beams (3) are welded and fixed to each other to form a whole.

3. The steel transfer beam for large height difference slope according to claim 1, characterized in that: The long channel steel (201) and the short channel steel (202) are locked by means of a plurality of corresponding second pairs of locking bolts (8), and the edges of the long channel steel (201) and the short channel steel (202) are welded to form a whole.

4. The construction method of a steel transfer beam for a large height difference slope as claimed in claim 1, characterized in that: The specific steps are as follows: 1) Perform inclined trimming on the top of the long channel steel (201); 2) connecting the long channel steel (201) with the top trimmed to the short channel steel (202) through a second pair of locking bolts (8), and performing welding operations on the edges of the long channel steel (201) and the short channel steel (202); 3) The reinforced concrete pile (1) is cast on site. After the reinforced concrete pile (1) is cast, the long channel steel (201) and the short channel steel (202) are anchored and installed at the top of the reinforced concrete pile (1); 4) trimming the two ends of the steel beam (3), and welding a plurality of studs (7) to corresponding positions of the steel beam (3) according to design requirements; 5) hoisting the steel beam (3) after trimming at both ends between the long channel steels (201) of two adjacent reinforced concrete piles (1) using a hoisting device, so that the beveled edge of the steel beam (3) abuts against the trimmed edge of the long channel steel (201); 6) The two ends of the steel beam (3) are respectively locked to the back of the short channel steel (202) by using the first pair of locking bolts (4). With the support of the long channel steel (201) and the fixation of the short channel steel (202), the lifting of the lifting equipment can be released; 7) Welding the beveled edges of the two ends of the steel beam (3) to the beveled edges of the long channel steel (201); 8) Welding and tying the steel bars (5) on the outside of the steel beam (3); 9) constructing formwork outside the steel beam (3) and the steel bars (5); 10) The concrete layer (6) is poured in the space formed by the formwork, and after routine curing, the formwork is removed, completing the construction of the steel transfer beam for the large height difference slope.

5. The construction method of a steel transfer beam for a large height difference slope according to claim 4 is characterized in that: In the step 7), the weld between the steel beam (3) and the long channel steel (201) is a full penetration groove weld, and the welds are required to be double-sided welded.

6. The construction method of a steel transfer beam for a large height difference slope according to claim 4, characterized in that: In the step 8), the contact portion between the steel bar (5) and the steel beam (3) must be cut off and separated and welded to the steel beam. The welding can be performed by single-sided welding, and the welding length is not less than 10d.

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