A stress compensation counter-support system and its construction method

Abstract

The application discloses a stress compensation reverse support system and a construction method thereof. The support system comprises a support unit and a compensation unit. The support unit comprises a vertical rod, a I-beam main beam and a I-beam secondary beam. The compensation unit comprises a base mechanism and a jacking mechanism. The base mechanism comprises a sandbag supporting pad, a bottom plate, a first positioning inner tube and a first positioning outer ring. The bottom plate is arranged on the sandbag supporting pad. The first positioning inner tube is connected to the bottom plate. The vertical rod is sleeved on the first positioning inner tube. The jacking mechanism comprises a lower supporting plate, an upper supporting plate, a second positioning inner tube, a spring, a sliding jacking, a nut and a screw rod. The screw rod is fixed above the upper supporting plate. The second positioning inner tube is fixed below the upper supporting plate. The lower part of the second positioning inner tube is movably arranged through the lower supporting plate. The spring is sleeved on the second positioning inner tube. The nut and the sliding jacking are movably arranged on the upper part of the screw rod. The application can compensate the reverse support system, ensure that the reverse support system is well reinforced under dynamic load and effectively solve the problems of local stress concentration of the existing reverse support structure and poor support effect under dynamic load.

Description

Technical Field

[0001] This invention relates to a stress compensation counter-support system and its construction method, belonging to the field of temporary reinforcement of building beam and slab structures. Background Technology

[0002] In recent years, due to the scarcity of urban construction land, the utilization rate of urban underground space has been continuously increasing. During construction above underground structures, the problem of excessive loads on the structure, leading to cracks or damage to the beams and slabs, and causing significant economic losses, is frequently encountered. To ensure the safety of underground structures, a counter-bracing reinforcement system is needed to strengthen the top beams and slabs. Existing structural reinforcement systems mainly include full-span steel pipe scaffolding counter-bracing, Bailey bridges, large steel pipe counter-bracing, and fixed steel frame counter-bracing. Full-span scaffolding counter-bracing involves a large number of scaffold members, resulting in a large workload. Furthermore, this method prevents the transfer of materials and equipment within the underground space, significantly impacting construction organization. Using fixed steel frames or Bailey bridges for structural support involves large structural weights, is difficult to erect, and carries certain risks, but provides good structural support. In addition, existing counter-bracing structures cannot effectively support under dynamic and long-term dynamic loads, making it difficult to guarantee structural safety. To better ensure the support effect of counter-bracing structures, there is an urgent need to innovate and invent a new type of counter-bracing system. Summary of the Invention

[0003] Based on the above, the present invention provides a stress compensation counter-support system and its construction method to solve the problems of poor support effect under dynamic load, easy local concentration of support stress, and complex or excessive weight of existing counter-support structures, so as to ensure the counter-support reinforcement effect under various conditions.

[0004] The technical solution of this invention is: a stress-compensating anti-support system, comprising: The support unit includes an upright, an I-beam main beam, and an I-beam secondary beam. The I-beam main beam is located above the upright, and the I-beam secondary beams are placed crosswise on top of the I-beam main beam. The I-beam secondary beams are located below the support structure. The compensation unit includes a base mechanism and a top support mechanism. The base mechanism includes a sandbag support, a base plate, a first positioning inner tube, and a first positioning outer ring. The base plate is disposed on the sandbag support, the first positioning inner tube is vertically disposed on the base plate, and the first positioning outer ring is disposed on the base plate and located outside the first positioning inner tube. The bottom of the upright is sleeved on the first positioning inner tube. The top support mechanism includes a lower support plate, an upper support plate, a second positioning inner tube, a spring, a sliding top support, a screw, and a nut. The screw is fixed above the upper support plate, the second positioning inner tube is vertically fixed below the upper support plate, and the lower part of the second positioning inner tube movably passes through the lower support plate. The spring is sleeved on the second positioning inner tube between the upper and lower support plates. The sliding top support is movably installed on the upper part of the screw, and the nut is connected to the upper part of the screw to support the sliding top support. The top of the upright is sleeved on the second positioning inner tube.

[0005] As a preferred embodiment of the stress compensation counter-support system of the present invention, a reinforcing plate is sleeved in the middle of the upright, a reinforcing fastener is installed on the side of the reinforcing plate, a tie rod is connected between two adjacent uprights, and the tie rod is connected to the reinforcing plate through the reinforcing fastener.

[0006] As a preferred embodiment of the stress compensation anti-support system described in this invention, a rubber pad is installed on the top surface of the secondary I-beam, and there are multiple secondary I-beams evenly arranged above the main I-beam.

[0007] As a preferred embodiment of the stress compensation anti-support system of the present invention, wherein: the main beam of the I-beam is composed of multiple I-beam units, and the upright is composed of multiple upright units.

[0008] As a preferred embodiment of the stress compensation counter-support system of the present invention, the sliding top support includes a sleeve, a support plate and a reinforcing rib. The sleeve is movably sleeved on the screw, the support plate is connected to the top of the sleeve, and the reinforcing rib is connected between the support plate and the sleeve.

[0009] As a preferred embodiment of the stress compensation anti-support system of the present invention, a second positioning outer ring is provided on the bottom surface of the lower support plate at the position corresponding to the second positioning inner tube.

[0010] As a preferred embodiment of the stress compensation anti-support system described in this invention, the nut includes a forward nut and a reverse nut.

[0011] As a preferred embodiment of the stress compensation anti-support system of the present invention, the support unit may be a single layer or multiple layers, and when there are multiple layers, the uprights of the upper layer and the uprights of the lower layer are on the same vertical line.

[0012] The present invention also provides a construction method for the stress compensation counter-support system described above, comprising the following steps: S1. Based on the load on the structure, calculate the specifications of the main I-beam, secondary I-beam, uprights, and springs of the support system, and design the overall system. S2, lay sandbag supports, level and compact the sandbags, place the base plate with the first positioning inner tube and the first positioning outer ring, place the uprights, the uprights are engaged in the middle of the first positioning inner tube and the first positioning outer ring, and the uprights are temporarily fixed by steel pipes. S3, Install the top support mechanism, adjust the sliding top support and nuts, and provide the positioning conditions for the I-beam main beam; S4. Place the main I-beams one by one, weld them after they are placed stably, and then place the secondary I-beams. S5, place jacks on the upper support plate to lift the main beam and secondary beam of the I-beam, and lift them together until the secondary beam is in close contact with the top plate and bears the force. S6, tie and fix the uprights, and continue to lift the jacks after fixing, apply prestress in two parts. The first part increases the axial force to the design axial force under the calculated working condition, and the second part increases the axial force compensation reserve. S7, adjust the sliding top support, tighten the nut to make the sliding top support tighten against the main beam of the I-beam, remove the jack, and the support system installation is complete; S8. After the reinforcement period, when dismantling the system, first use jacks to hold the main beam of the I-beam, then loosen the nuts, move the sliding top support to fall, and lower the jacks. Then dismantle the support system in the order of secondary beams of the I-beam, main beam of the I-beam, and uprights.

[0013] The beneficial effects of this invention are: 1. This invention uses a lower support plate, an upper support plate, a second positioning inner tube, a spring, a sliding top support, and a nut as stress compensation units, which can compensate for the anti-support system. The use of high-strength springs for stress compensation is convenient and efficient, and the prestress of the springs is greater than the axial force of the designed uprights, thus ensuring good reinforcement of the anti-support system under dynamic loads and effectively solving the problem of poor support effect of existing anti-support structures under dynamic loads.

[0014] 2. In this invention, the anti-support system is set up in the form of I-beam secondary beams, I-beam main beams and uprights. Rubber pads are provided on the I-beam secondary beams to fit well with the structural plate reinforcement plate. Rubber rings are provided on the upper and lower parts of the uprights. Sandbags are used for support under the bottom plate, which can effectively transmit the structural force and diffuse the stress, avoid local stress concentration. At the same time, the sandbag support can adapt well to the uneven ground conditions of the construction site.

[0015] 3. In this invention, beams and columns are constructed using unit components, reducing the support system's footprint on the construction work surface and facilitating on-site manual handling and installation. Steel pipe supports, steel beam units, and sandbag supports are all standard reusable materials used on construction sites, eliminating the need for separate purchases and making them economical and practical. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the stress compensation anti-support system. Figure 2 This is a schematic diagram of the main beam and secondary beams of an I-beam. Figure 3 This is a schematic diagram showing the uprights mounted on the base mechanism and the top support mechanism. Figure 4 This is a schematic diagram of the base mechanism; Figure 5 This is a schematic diagram of the support mechanism from one perspective. Figure 6 This is a schematic diagram of the support mechanism from another perspective; Figure 7 This is a schematic diagram of a sliding top support; Figure 8 This is a schematic diagram of the overall support system; Explanation of reference numerals in the attached figures: 1. Upright pole; 2. I-beam main beam; 3. I-beam secondary beam; 4. Sandbag support; 5. Base plate; 6. First positioning inner tube; 7. First positioning outer ring; 8. Lower support plate; 9. Upper support plate; 10. Screw; 11. Second positioning inner tube; 12. Spring; 13. Sliding top support; 131. Sleeve; 132. Support plate; 133. Reinforcing rib; 14. Nut; 15. Second positioning outer ring; 16. Rubber pad; 17. Reinforcing plate; 18. Reinforcing fastener; 19. Tie rod; 20. Jack. Detailed Implementation

[0017] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0018] Please see Figures 1 to 8 This embodiment provides a stress compensation counter-support system, which includes a support unit and a compensation unit.

[0019] The support unit includes uprights 1, a main I-beam 2, and secondary I-beams 3. The main I-beam 2 is installed above the uprights 1, and the secondary I-beams 3 are cross-welded to the top of the main I-beam 2. The support structure is placed on top of the secondary I-beams 3. A rubber pad 16 is installed on the top surface of the secondary I-beams 3, which fits well against the bottom surface of the support structure. A reinforcing plate 17 is sleeved in the middle of the uprights 1, and reinforcing fasteners 18 are connected to the sides of the reinforcing plate 17. A tie rod 19 is connected between adjacent uprights 1, and the tie rod 19 is connected to the reinforcing plate 17 through the reinforcing fasteners 18, thereby achieving lateral fastening of adjacent uprights 1 and improving the support effect. The support unit can be single-layered or multi-layered. When it is multi-layered, the uprights 1 of the upper layer and the uprights 1 of the lower layer are on the same vertical line, thus achieving better support. In this embodiment, there are multiple secondary beams 3 of the I-beam, which are evenly arranged above the main beam 2 of the I-beam. The main beam 2 of the I-beam is composed of multiple I-beam units, and the upright 1 is composed of multiple upright units.

[0020] The compensation unit includes a base mechanism and a top support mechanism. The base mechanism includes several sandbag supports 4, a base plate 5, a first positioning inner tube 6, and a first positioning outer ring 7. The base plate 5 is placed on the sandbag supports 4. The first positioning inner tube 6 is vertically connected to the base plate 5. The first positioning outer ring 7 is connected to the base plate 5 and located outside the first positioning inner tube 6. The bottom of the upright 1 is sleeved on the first positioning inner tube 6 and engaged between the first positioning inner tube 6 and the first positioning outer ring 7. The top support mechanism includes a lower support plate 8, an upper support plate 9, a second positioning inner tube 11, a spring 12, a sliding top support 13, a nut 14, and a screw 10. The screw 10 is fixedly connected above the upper support plate 9. Several second positioning inner tubes 11 are vertically fixed below the upper support plate 9. The lower part of the second positioning inner tube 11 moves through the lower support plate 8. The spring 12 is sleeved on the part of the second positioning inner tube 11 between the upper support plate 9 and the lower support plate 8. The sliding top support 13 is movably installed on the upper part of the screw 10. The sliding top support 13 includes a sleeve 131, a support plate 132, and a reinforcing rib 13. 3. The sleeve 131 is movably sleeved on the screw 10. The support plate 132 is connected to the top of the sleeve 131, and the reinforcing rib 133 is connected between the support plate 132 and the sleeve 131. The nut 14 is connected to the upper part of the screw 10 to support the sliding top support 13. The nut 14 includes a forward nut and a reverse nut. A second positioning outer ring 15 is connected on the bottom surface of the lower support plate 8 at the position corresponding to the second positioning inner tube 11. The top of the upright 1 is sleeved on the second positioning inner tube 11 and engaged between the second positioning inner tube 11 and the second positioning outer ring 15.

[0021] The construction method of the above-mentioned stress compensation counter-support system includes the following steps: S1. First, based on the load on the structure, calculate the specifications of the main I-beam 2, secondary I-beam 3, upright 1, and spring 12 of the support system, and design the overall system. S2, lay sandbag support 4, level and compact the sandbags, place the base plate 5 with the first positioning inner tube 6 and the first positioning outer ring 7, then place the upright 1, and clamp the upright 1 between the first positioning inner tube 6 and the first positioning outer ring 7. The upright 1 is temporarily fixed by steel pipe. S3, place the sliding top support 13, fit the second positioning inner tube 11 onto the top of the upright 1, adjust the sliding top support 13 and the nut 14 to provide the positioning conditions for the I-beam main beam 2. S4, place the main I-beam 2 and secondary I-beam 3 one by one, that is, place the main I-beam 2 on the sliding top support 13, and weld the main I-beam 2 and secondary I-beam 3 after placing them stably, and then place the supporting structure. S5, place jacks 20 on each upper support plate 9 to lift the main beam 2 and secondary beam 3 of the I-beam, and lift them together until the secondary beams are in close contact with the bottom surface of the supporting structure to bear the force. S6, the upright 1 is fixed by the reinforcing plate 17 and the tie rod 19. After fixing, the jack 20 is raised to apply prestress in two stages. The first stage increases the axial force to the design axial force under the calculated working condition, and the second stage increases the axial force compensation reserve. At this time, under the action of the jack, the upper support plate 9 moves down, and the spring 12 is compressed to generate prestress. The prestress should be greater than the design axial force of the upright 1. S7, adjust the sliding top support 13, tighten the forward nut and reverse nut to make the sliding top support 13 press against the main beam 2 of the I-beam, remove the jack 20, and the support system installation is complete; S8. After the reinforcement period, when dismantling the system, first use jack 20 to support the main beam 2 of the I-beam, then loosen the forward and reverse nuts, move the sliding top support 13 to fall, and lower jack 20. Then dismantle the support system in the order of secondary beam 3 of the I-beam, main beam 2 of the I-beam, and upright 1.

[0022] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A construction method for a stress-compensating counter-support system, characterized in that, The support system includes: The support unit includes a pole (1), an I-beam main beam (2) and an I-beam secondary beam (3). The I-beam main beam (2) is located above the pole (1), and the I-beam secondary beam (3) is placed crosswise on top of the I-beam main beam (2). The I-beam secondary beam (3) is located below the support structure. The compensation unit includes a base mechanism and a top support mechanism. The base mechanism includes a sandbag support (4), a base plate (5), a first positioning inner tube (6), and a first positioning outer ring (7). The base plate (5) is disposed on the sandbag support (4), the first positioning inner tube (6) is vertically disposed on the base plate (5), and the first positioning outer ring (7) is disposed on the base plate (5) and located outside the first positioning inner tube (6). The bottom of the upright (1) is sleeved on the first positioning inner tube (6). The top support mechanism includes a lower support plate (8), an upper support plate (9), a second positioning inner tube (11), a spring (12), a sliding top support (13), a screw (10), and a nut (14). The screw (10) is fixed above the upper support plate (9), the second positioning inner tube (11) is vertically fixed below the upper support plate (9), the lower part of the second positioning inner tube (11) moves through the lower support plate (8), the spring (12) is sleeved on the second positioning inner tube (11) between the upper support plate (9) and the lower support plate (8), the sliding top support (13) is movably installed on the upper part of the screw (10), and the nut (14) is connected to the upper part of the screw (10) to support the sliding top support (13), the top of the upright (1) is sleeved on the second positioning inner tube (11), and the prestress of the spring (12) is greater than the axial force of the upright (1); The construction method of the stress compensation counter-support system includes the following steps: S1, based on the load on the structure, calculate the specifications of the main beam (2), secondary beam (3), upright (1), and spring (12) of the support system, and design the overall system; S2, lay sandbag support (4), level the sandbag and compact it, place the base plate (5) with the first positioning inner tube (6) and the first positioning outer ring (7), place the upright (1), the upright (1) is engaged in the middle of the first positioning inner tube (6) and the first positioning outer ring (7), and the upright (1) is temporarily fixed by steel pipe. S3, place the top support mechanism, adjust the sliding top support (13) and nut (14) to provide the positioning conditions for the I-beam main beam (2); S4, place the main I-beams (2) one by one, weld them after they are placed stably, and then place the secondary I-beams (3). S5, place jacks (20) on the upper support plate (9) to lift the main beam (2) and secondary beam (3) of the I-beam, and lift them together until the secondary beam is in close contact with the bottom surface of the supporting structure and is subjected to force; S6, tie the upright (1) to fix it, and continue to lift the jack (20) after fixing it. Apply prestress in two parts. The first part increases the axial force to the design axial force of the calculated working condition, and the second part increases the axial force compensation reserve. S7, adjust the sliding top support (13), tighten the nut (14) to make the sliding top support (13) press against the main beam (2) of the I-beam, remove the jack (20), and the support system installation is complete; S8. After the reinforcement period, when dismantling the system, first use jacks (20) to hold the main beam (2) of the I-beam, then loosen the nuts (14), move the sliding top support (13) down, and drop the jacks (20). Then dismantle the support system in the order of secondary beam (3), main beam (2), and upright (1).

2. The construction method of the stress compensation counter-support system according to claim 1, characterized in that, A reinforcing plate (17) is sleeved in the middle of the upright (1), and a reinforcing fastener (18) is installed on the side of the reinforcing plate (17). A tie rod (19) is connected between two adjacent uprights (1), and the tie rod (19) is connected to the reinforcing plate (17) through the reinforcing fastener (18).

3. The construction method of the stress compensation counter-support system according to claim 1, characterized in that, The top surface of the secondary beam (3) of the I-beam is equipped with a rubber pad (16). There are multiple secondary beams (3) of the I-beam, which are evenly arranged above the main beam (2) of the I-beam.

4. The construction method of the stress compensation counter-support system according to claim 1, characterized in that, The main beam (2) of the I-beam is composed of multiple I-beam units, and the upright (1) is composed of multiple upright units.

5. The construction method of the stress compensation counter-support system according to claim 1, characterized in that, The sliding top support 13) includes a sleeve (131), a support plate (132), and a reinforcing rib (133). The sleeve (131) is movably sleeved on the screw (10), the support plate (132) is connected to the top of the sleeve (131), and the reinforcing rib (133) is connected between the support plate (132) and the sleeve (131).

6. The construction method of the stress compensation counter-support system according to claim 1, characterized in that, The bottom surface of the lower support plate (8) is provided with a second positioning outer ring (15) at the position corresponding to the second positioning inner tube (11).

7. The construction method of the stress compensation counter-support system according to claim 1, characterized in that, The nut (14) includes a forward nut and a reverse nut.

8. The construction method of the stress compensation counter-support system according to claim 1, characterized in that, The support unit can be a single layer or multiple layers. When it is multiple layers, the uprights (1) of the upper layer and the uprights (1) of the lower layer are on the same vertical line.

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