Construction method of pre-tensioned assembled steel channel pedestal

Abstract

The present invention discloses a construction method for a pre-tensioned assembled steel trough pedestal, comprising the following construction steps: S1. preparing prefabricated tie beams and steel load-bearing frames; S2. setting a foundation pit for pre-burying the prefabricated tie beams at a preset position, and burying the prefabricated tie beams in the foundation pit; S3. pouring tabletop concrete between a plurality of prefabricated tie beams, wherein a drainage pipe is arranged in the tabletop concrete; S4. limiting the steel load-bearing frames by the prefabricated tie beams; S5. pouring the tensioning end tabletop; S6. before prefabrication of the beam and slab, arranging a front reinforcement structure on the front end face of the steel load-bearing frame near the head end of the beam and slab extension direction, and arranging a rear reinforcement structure on the rear end face of the steel load-bearing frame near the end end of the beam and slab extension direction; S7. prefabrication of the beam and slab; S8. after the prefabrication of the beam and slab is completed, removing the steel load-bearing frames and the prefabricated tie beams; the construction cost of the beam site can be reduced, and the construction progress can be accelerated.

Description

Technical Field

[0001] The present invention relates to the field of building construction, and in particular to a construction method of a pre-tensioned assembled steel channel pedestal. Background Art

[0002] The existing pre-tensioned precast beam and slab pedestal bearing frame is a reinforced concrete structure. After the beam and slab prefabrication is completed, the entire prefabrication beam yard is abandoned. The cost of building a beam yard is high and the construction is relatively troublesome. After the beam yard is built, the beam and slab prefabrication can only be carried out after the bearing frame concrete reaches the design strength (generally not less than 14 days), which delays the construction period.

[0003] Therefore, in order to solve the above problems, a pre-tensioned assembled steel trough pedestal construction method is needed, which can reduce the construction cost of the beam yard and speed up the construction progress. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to overcome the defects in the prior art and provide a pre-tensioned assembled steel trough pedestal construction method, which can reduce the construction cost of the beam yard, speed up the construction progress, and can also be used in a turnover manner.

[0005] The construction method of the pre-tensioned assembled steel channel pedestal of the present invention comprises the following construction steps:

[0006] S1. Prepare prefabricated tie beams and steel bearing frames;

[0007] The prefabricated tie beam is pre-embedded with anchor bolts for limiting the steel bearing frame and lifting lugs for lifting the prefabricated tie beam. The steel bearing frame is at least a double-jointed I-beam or H-beam (selected according to design requirements);

[0008] S2. A foundation pit for pre-embedded prefabricated tie beams is provided at a preset location, and prefabricated tie beams are buried in the foundation pit;

[0009] S3 pouring several precast tie beams between the table concrete, the table concrete is arranged with a drain pipe;

[0010] S4. The steel bearing frame is limited by the prefabricated tie beams, wherein the prefabricated tie beams are multiple, and the top surfaces of the multiple prefabricated tie beams are located at the same horizontal plane to support the steel bearing frame, and the steel bearing frame includes at least two groups arranged on both sides of the central portion of the prefabricated tie beam, and the two groups of steel bearing frames are parallel;

[0011] S5. Cast the tension end table;

[0012] The tensioning end table is arranged at the head end and the end end of the beam and slab extension direction, and the casting tensioning end table corresponding to the head end and the end end of the beam and slab extension direction respectively provides an operating surface for the tensioning of the preset beam and slab.

[0013] The front end face of the precast tie beam near the beginning of the beam-slab extension direction is flush with the rear end face of the tensioning end table near it, and the rear end face of the precast tie beam near the end of the beam-slab extension direction is flush with the front end face of the tensioning end table near it;

[0014] S6. Before prefabrication of the beams and slabs, arrange a front reinforcement structure on the front face of the steel support frame near the beginning of the beam and slab extension direction, and arrange a rear reinforcement structure on the rear face of the steel support frame near the end of the beam and slab extension direction;

[0015] The front reinforcement structure includes a front head steel plate arranged on the front end of the steel frame near the head end of the beam and slab extension direction, and a front reinforcement rib arranged on the rear side of the front head steel plate; the rear reinforcement structure includes a rear head steel plate arranged on the rear end of the steel frame near the end of the beam and slab extension direction, and a rear reinforcement rib arranged on the front side of the rear head steel plate;

[0016] S7. Beam and slab prefabrication;

[0017] S8. After the prefabrication of beams and slabs is completed, the steel load-bearing frames and prefabricated tie beams shall be dismantled and reused or their residual value shall be recovered.

[0018] Furthermore, the anchor bolts embedded in the prefabricated tie beam are U-shaped bolts, and the steel bearing frame is limited in the groove of the U-shaped bolts;

[0019] The slots of the "U"-shaped bolts are closed by steel pressure plates so that the steel section bearing frame is limited in the circumferential direction of its extension direction; more specifically, the steel section bearing frame is firmly fixed by prefabricated tie beams to prevent the steel section bearing frame from becoming unstable during tensioning.

[0020] Furthermore, in step S2, the number of the foundation pits is consistent with the number of prefabricated tie beams, and the prefabricated tie beams are connected to the foundation pits in a one-to-one correspondence to form a whole; before pre-burying the corresponding prefabricated tie beams in several foundation pits, the flatness of the bottom of each foundation pit needs to be controlled so that after the several prefabricated tie beams are pre-buried in their respective corresponding foundation pits, the top surfaces of the several prefabricated tie beams are located on the same horizontal plane.

[0021] Furthermore, the flatness of the foundation pit bottom is controlled by filling gravel, and the gravel particle size is between 8mm and 12mm.

[0022] Furthermore, the prefabricated tie beams are embedded in the foundation pit by hoisting.

[0023] Furthermore, in step S8, the steel bearing frame and the prefabricated tie beam are dismantled and reused or their residual value is recovered.

[0024] The beneficial effects of the present invention are as follows: the construction method of a pre-tensioned assembled steel channel pedestal disclosed in the present invention has the following advantages:

[0025] a. Reduce the construction cost of the beam yard. The load-bearing frame of the pre-tensioned prefabricated beam slab pedestal is replaced by double-piece steel (I-beam or H-beam). After the beam slab is prefabricated, the steel can be reused or its residual value can be recovered.

[0026] b. Speed ​​up the construction progress. Tie beams are prefabricated and installed. At the same time, the use of steel bearing frames does not require waiting for the concrete strength to reach its peak. The above two points can speed up the construction of the beam yard and enable it to be used in advance.

[0027] c. After the prefabricated beams and slabs are processed, if there are similar engineering projects, the prefabricated tie beams and steel load-bearing frames can be used in a turnover manner; speed up the construction of the beam yard; shorten the prefabrication period of the beams and slabs; reduce the construction cost of the beam yard; and make construction simple and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0029] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0030] Figure 2 It is a schematic diagram of the top view of the structure of the present invention;

[0031] Figure 3 For the present invention Figure 1 AA structural diagram;

[0032] Figure 4 For the present invention Figure 1 Schematic diagram of the BB structure. DETAILED DESCRIPTION

[0033] Figure 1 This is a schematic structural diagram of the present invention. As shown in the figure, the construction method of the pre-tensioned assembled steel channel pedestal in this embodiment includes the following construction steps:

[0034] S1. Prepare prefabricated tie beam 1 and steel bearing frame 2;

[0035] The prefabricated tie beam 1 is pre-embedded with anchor bolts 3 for limiting the steel bearing frame 2 and lifting lugs for lifting the prefabricated beam system. The steel bearing frame 2 is at least a double-jointed I-beam or H-beam, and is selected according to the designed tension force. In this scheme, the steel bearing frame 2 is two I-beams connected side by side, which will not be described in detail here.

[0036] The anchor bolts 3 embedded in the prefabricated tie beam 1 are U-shaped bolts, and the steel bearing frame 2 is limited in the groove of the U-shaped bolts;

[0037] The notches of the U-shaped bolts are closed by the steel pressure plates 4, so that the section steel bearing frame 2 is limited in the circumferential direction of its extension direction. More specifically, the section steel bearing frame is firmly fixed by the prefabricated tie beam to prevent the section steel bearing frame from becoming unstable during tensioning. When disassembling, only the nuts on the tops of the U-shaped bolts need to be disassembled to complete the disassembly of the steel pressure plates 4 and the section steel bearing frame 2 on the prefabricated tie beam 1. This is simple, convenient and fast, and the construction is convenient, which can speed up the construction progress.

[0038] The prefabricated tie beam 1 is pre-buried in the foundation pit by hoisting. Figure 3 As shown, the lifting lugs 5 of the prefabricated tie beam 1 are located on both sides of the steel bearing frame 2, which improves the hoisting stability and reliability of the prefabricated tie beam 1;

[0039] S2. A foundation pit for pre-embedded prefabricated tie beams 1 is provided at a preset position, and a prefabricated tie beam 1 is buried in the foundation pit; the number of the foundation pits is consistent with the number of prefabricated tie beams 1, and the prefabricated tie beams 1 are connected to the foundation pits in a one-to-one correspondence to form a whole;

[0040] Before pre-embedding the corresponding prefabricated tie beams 1 in the foundation pits, the flatness of the bottom of each foundation pit must be controlled so that after the prefabricated tie beams 1 are pre-embedded in their respective foundation pits, the top surfaces of the prefabricated tie beams 1 are located on the same horizontal plane;

[0041] The flatness of the foundation pit bottom is controlled by filling crushed stones, and the crushed stone particle size is between 8mm and 12mm; the crushed stone particle size of this solution is controlled at 12mm;

[0042] S3 pouring several precast tie beams 1 between the table concrete 6, the table concrete 6 is arranged within the drain pipe 7 to prevent water accumulation;

[0043] S4. The steel bearing frame 2 is limited by the prefabricated tie beam 1, wherein the prefabricated tie beam 1 is multiple, and the top surfaces of the multiple prefabricated tie beams 1 are located at the same horizontal plane to support the steel bearing frame 2, and the steel bearing frame 2 includes at least two groups arranged on both sides of the transverse middle of the prefabricated tie beam 1, and the two groups of steel bearing frames 2 are parallel;

[0044] S5. Casting tension end table 8;

[0045] This plan Figure 2 As shown, the head end of the beam slab 9 in the extension direction is on the left, and the end end of the beam slab 9 in the extension direction is on the right, the middle part of the beam slab 9 in the extension direction is close to the head end as the front, and the middle part of the beam slab 9 in the extension direction is close to the end as the back, which will not be described in detail here; the tensioning end table 8 is arranged at the head end and the end end of the extension direction of the beam slab 9, and the casting tensioning end table 8 corresponding to the head end and the end end of the extension direction of the beam slab 9 respectively provides a working surface for tensioning the preset beam slab;

[0046] The front end face of the precast tie beam 1 near the beginning of the beam plate 9 in the extension direction is flush with the rear end face of the tensioning end table 8 close thereto; the rear end face of the precast tie beam 1 near the end of the beam plate 9 in the extension direction is flush with the front end face of the tensioning end table 8 close thereto;

[0047] S6 beam 9 prefabrication, near the beam 9 extending in the direction of the first end of the steel frame 2 front end face arrangement before the reinforcement structure, near the beam 9 extending in the direction of the end of the steel frame 2 rear end face arrangement after the reinforcement structure;

[0048] The front reinforcement structure includes a front head steel plate 81 arranged on the front end of the steel frame 2 near the head end of the beam slab 9 in the direction of extension, and a front reinforcement rib 82 arranged on the rear side of the front head steel plate 81. The rear reinforcement structure includes a rear head steel plate 83 arranged on the rear end of the steel frame 2 near the end of the beam slab 9 in the direction of extension, and a rear reinforcement rib 84 arranged on the front side of the rear head steel plate 83.

[0049] S7. Prefabrication of the beam slab 9; the steel strand tensioning during the prefabrication of the beam slab 9 follows existing techniques. For example, in this solution, a hydraulic jack 101 is used to separate the fixed crossbeam 102 and the movable crossbeam 103 on the tensioning pedestal to increase the tensioning force of the steel strands. This is a step that can be completed by those skilled in the art according to existing techniques and will not be described in detail here. During the prefabrication of the beam slab 9, it is necessary to ensure that prefabricated tie beams 1 of sufficient width are arranged at both ends of the prefabricated beam slab 9 along its length. The width of the prefabricated tie beams 1 is determined according to the actual tensioning force to prevent bending and twisting of the steel support frame 2, thereby improving the forming reliability and efficiency of the beam slab 9.

[0050] S8. After the beam slab 9 is prefabricated, the steel bearing frame 2 and the prefabricated tie beam 1 are removed; the prefabricated tie beam 1 is removed according to the actual situation; the steel bearing frame and the prefabricated tie beam are reused or their residual value is recovered after removal.

[0051] This solution only has one pedestal. During construction, double or multiple rows can be used according to the number of prefabricated beams and the supply demand of beams. When double or multiple rows are used, the middle steel-shaped steel bearing frames can be shared, and the size of the prefabricated tie beam 1 and the position of the embedded bolts can be adjusted at the same time. They will not be repeated here. That is, this solution prepares multiple groups of beam plates 9 between the same group (two) of steel-shaped steel bearing frames 2 at the same time, and the steel-shaped steel bearing frames 2 can be removed, which can not only reduce the construction cost of the beam site, but also speed up the construction progress.

[0052] This solution has the following advantages:

[0053] a. Reduce the construction cost of the beam yard. The load-bearing frame of the pre-tensioned prefabricated beam slab 9 is replaced by double-jointed steel (I-beam or H-beam). After the prefabrication of the beam slab 9 is completed, the steel can be reused or the residual value can be recovered.

[0054] b. Speed ​​up the construction progress. Tie beams are prefabricated and installed. At the same time, the use of steel bearing frames does not require waiting for the concrete strength to reach its peak. The above two points can speed up the construction of the beam yard and enable it to be used in advance.

[0055] c. After the prefabricated beam slab 9 is processed, the prefabricated tie beam 1 and the steel bearing frame can be used in a similar project; the construction speed of the beam yard is accelerated; the prefabrication period of the beam slab 9 is shortened; the construction cost of the beam yard is reduced; and the construction is simple and fast.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A construction method for a pre-tensioned assembled steel channel pedestal, characterized by: The construction steps include: S1. Prepare prefabricated tie beams and steel bearing frames; The prefabricated tie beams are pre-buried with anchor bolts for limiting the steel bearing frame and lifting lugs for lifting the prefabricated beam system. The steel bearing frame is at least a double-jointed I-beam or H-beam. S2. A foundation pit for pre-embedded prefabricated tie beams is provided at a preset location, and prefabricated tie beams are buried in the foundation pit; S3 pouring several precast tie beams between the table concrete, the table concrete is arranged with a drain pipe; S4. The steel bearing frame is limited by the prefabricated tie beams, wherein the prefabricated tie beams are multiple, and the top surfaces of the multiple prefabricated tie beams are located at the same horizontal plane to support the steel bearing frame, and the steel bearing frame includes at least two groups arranged on both sides of the central portion of the prefabricated tie beam, and the two groups of steel bearing frames are parallel; S5. Cast the tension end table; The tensioning end table is arranged at the head end and the end end of the beam and slab extension direction, and the casting tensioning end table located at the head end and the end end of the beam and slab extension direction respectively provides an operating surface for tensioning the preset beam and slab; The front end face of the precast tie beam near the beginning of the beam-slab extension direction is flush with the rear end face of the tensioning end table near it, and the rear end face of the precast tie beam near the end of the beam-slab extension direction is flush with the front end face of the tensioning end table near it; S6. Before prefabrication of the beams and slabs, arrange a front reinforcement structure on the front face of the steel support frame near the beginning of the beam and slab extension direction, and arrange a rear reinforcement structure on the rear face of the steel support frame near the end of the beam and slab extension direction; The front reinforcement structure includes a front head steel plate arranged on the front end of the steel frame near the head end of the beam and slab extension direction, and a front reinforcement rib arranged on the rear side of the front head steel plate; the rear reinforcement structure includes a rear head steel plate arranged on the rear end of the steel frame near the end of the beam and slab extension direction, and a rear reinforcement rib arranged on the front side of the rear head steel plate; S7. Beam and slab prefabrication; S8. After the prefabrication of beams and slabs is completed, the steel load-bearing frames and prefabricated tie beams shall be removed.

2. The construction method of the pre-tensioned assembled steel channel pedestal according to claim 1, characterized in that: The anchor bolts embedded in the prefabricated tie beam are U-shaped bolts, and the steel bearing frame is limited in the groove of the U-shaped bolts; The slots of the "U"-shaped bolts are closed by steel pressure plates so that the steel bearing frame is limited in the circumferential direction of its extension direction.

3. The construction method of the pre-tensioned assembled steel channel pedestal according to claim 1, characterized in that: In step S2, the number of the foundation pits is consistent with the number of prefabricated tie beams, and the prefabricated tie beams are connected to the foundation pits in a one-to-one correspondence to form a whole; before pre-burying the corresponding prefabricated tie beams in the foundation pits, the flatness of the bottom of each foundation pit needs to be controlled so that after the prefabricated tie beams are pre-buried in their respective corresponding foundation pits, the top surfaces of the prefabricated tie beams are located on the same horizontal plane.

4. The construction method of the pre-tensioned assembled steel channel pedestal according to claim 3 is characterized in that: The flatness of the foundation pit bottom is controlled by filling crushed stones, and the particle size of the crushed stones is between 8mm and 12mm.

5. The construction method of the pre-tensioned assembled steel channel pedestal according to claim 1 is characterized in that: The prefabricated tie beams are embedded in the foundation pit by hoisting.

6. The construction method of the pre-tensioned assembled steel channel pedestal according to claim 1, characterized in that: In step S8, the steel bearing frame and the prefabricated tie beam are dismantled and reused or their residual value is recovered.

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