Inclined throwing support system with prestress capable of being compensated on line and construction method of inclined throwing support system

Abstract

The invention discloses an inclined throwing support system with prestress capable of being compensated online and a construction method of the inclined throwing support system, and belongs to the technical field of inclined throwing supports. The device comprises an H-shaped steel inclined strut system, a bearing platform foundation and a fender post, the H-shaped steel inclined strut system is obliquely arranged between the bearing platform foundation and the fender post, the lower portion of the H-shaped steel inclined strut system is connected with the bearing platform foundation, and a back pressure connecting assembly is arranged on the upper portion of the H-shaped steel inclined strut system. The back pressure connecting assembly comprises a back pressure bracket, a supporting bracket and an H-shaped steel enclosing purlin. According to the inclined throwing and supporting system, downward constraining force is provided through the back pressure bracket, so that it is ensured that the joint of the H-shaped steel inclined supporting system and the fender post does not deviate, and then the overall stability of the inclined throwing and supporting system is ensured; prestress on-line adjustment can be conducted through the prestress on-line compensation component, the component has a self-locking function, the supporting force of the H-shaped steel inclined strut system can adapt to changes of temperature stress and the like caused by temperature changes, and therefore a guarantee is provided for supporting safety of a foundation pit.

Description

Technical Field

[0001] The present invention relates to the technical field of diagonal bracing, and more specifically to a diagonal bracing system capable of online prestress compensation and a construction method thereof. Background Art

[0002] In some cases where the foundation pit area is large and the depth is less than 10 meters, in order to avoid the high cost and construction difficulty of horizontal support, people have designed an inclined support form. The inclined piles in the inclined support structure need to extend into the hard soil layer to play a role. At present, traditional inclined support materials are mostly lattice columns or round tube columns. The processing and manufacturing process of the materials is cumbersome, the processing quality is difficult to control, the recycling rate is low, and the cost is high; at the same time, in order to improve the supporting force of the inclined support, the existing inclined support is generally composed of a steel pipe and a cement soil expansion head wrapped on the steel pipe. The connection strength between the steel pipe and the expansion head is low and cannot withstand a large pressure. In addition, during the construction process, the steel pipe in the inclined pile will produce a large compression deformation under the pressure of the soil outside the foundation pit, which causes the side wall of the foundation pit to deform toward the inside of the foundation pit accordingly, affecting the safety of the foundation pit. Due to the large changes in the geological conditions of different projects, the current inclined support is mostly affected by geological changes, and the supporting force is unclear, which makes the foundation pit support have safety hazards. At the same time, with current technology, after applying prestress, some will remove the jacks and other prestressing parts after placing gaskets and other connectors, and some will weld the H-shaped steel to the connecting plate after the prestress is applied. All of the above situations cannot solve the deformation and temperature stress caused by the steel itself expanding and contracting due to seasonal temperature changes during the use of the diagonal brace. Summary of the invention

[0003] 1. Technical problem to be solved by the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide a prestressed online-compensated diagonal brace system and a construction method thereof. The present invention provides a downward constraint force through a back-pressure corbel, thereby ensuring that the connection between the H-steel diagonal brace system and the retaining piles will not be offset, thereby ensuring the overall stability of the diagonal brace system; the H-steel diagonal brace system is simultaneously connected to multiple groups of H-steel purlins through the upper end plate, thereby improving the overall safety of the foundation pit support; the prestressed pressure can be adjusted online through the prestressed pressure online compensation component, and the supporting force of the H-steel diagonal brace system can adapt to the temperature stress changes caused by temperature changes, thereby providing protection for the support safety of the foundation pit.

[0005] 2. Technical solution

[0006] In order to achieve the above object, the technical solution provided by the present invention is:

[0007] The present invention discloses a prestressed inclined brace system capable of online compensation, comprising an H-shaped steel inclined brace system, a cap foundation and a retaining pile, wherein the H-shaped steel inclined brace system is arranged obliquely between the cap foundation and the retaining pile;

[0008] The upper part of the H-shaped steel diagonal bracing system is provided with a counter-pressure connection assembly, which includes a counter-pressure corbel, a supporting corbel and an H-shaped steel purlin;

[0009] The counter-pressure corbel and the supporting corbel are fixed at intervals on the outside of the retaining pile, and an H-shaped steel purlin is arranged between the counter-pressure corbel and the supporting corbel;

[0010] The upper part of the H-shaped steel diagonal bracing system is connected to the retaining piles through a back-pressure connection assembly, and the lower part of the H-shaped steel diagonal bracing system is connected to the cap foundation.

[0011] Furthermore, a lower end plate is provided at the connection between the H-shaped steel diagonal bracing system and the pedestal foundation, and two ends of the lower end plate are respectively fixed to the H-shaped steel diagonal bracing system and the pedestal foundation.

[0012] Furthermore, an upper end plate is provided at the connection between the H-shaped steel diagonal bracing system and the H-shaped steel purlin.

[0013] Furthermore, the H-shaped steel purlins may be provided in one or more groups. When multiple groups of H-shaped steel purlins are provided, spacer corbels are provided between two adjacent groups of H-shaped steel purlins, and the outer surfaces of the multiple groups of H-shaped steel purlins are commonly connected to the upper end plate.

[0014] Furthermore, the H-shaped steel diagonal bracing system includes a first diagonal bracing member and a second diagonal bracing member, and a prestressed online compensation member is provided at the connection between the first diagonal bracing member and the second diagonal bracing member. Both ends of the prestressed online compensation member are respectively connected to the first diagonal bracing member and the second diagonal bracing member by bolts.

[0015] Furthermore, the prestressed in-line compensation component has a self-locking function, and the self-locking forms include but are not limited to thread self-locking, pad self-locking or force box self-locking.

[0016] Furthermore, one end of the upper end plate is fixed to the first diagonal brace, and the other end of the upper end plate is connected to a plurality of groups of H-shaped steel purlins respectively by bolts;

[0017] One end of the lower end plate is fixed to the second diagonal support member, and the other end of the lower end plate is fixed to the bearing base.

[0018] Furthermore, a cap foundation support pile is provided at the bottom of the cap foundation.

[0019] Furthermore, the counter-pressure corbel and the supporting corbel are both arranged horizontally.

[0020] A construction method of a prestressed inclined brace system capable of online compensation, comprising the following steps:

[0021] Step 1: construct the foundation piles of the cap;

[0022] Step 2: Taking the setting of two layers of H-shaped steel purlins as an example, the first layer of earthwork is excavated to 600mm below the lower end of the H-shaped steel purlin. After the excavation of the first layer of earthwork is completed, the earthwork around the bottom cap foundation is excavated synchronously, and the pile side counter-pressure soil is reserved for the pile side of the retaining piles;

[0023] Step 3: construct the cap foundation and lower end plate;

[0024] Step 4: Weld the supporting corbels;

[0025] Step 5: Install the first layer of H-shaped steel purlin, fill the purlin seams, and weld the spacing brackets;

[0026] Step 6: Install the second-layer H-shaped steel purlin, fill the purlin seams, and weld the top counter-pressure bracket;

[0027] Step 7: The H-beam bracing system is processed in the factory, and the inclination angle of the H-beam bracing system is fine-tuned on site according to the actual size;

[0028] Step 8: Carve grooves in the pile side counter-pressure soil. After assembling the first diagonal brace, the second diagonal brace and the prestressed in-line compensation component, hoist the entire H-shaped steel diagonal brace system into the groove;

[0029] Step 9: The upper end of the first diagonal brace is connected to the H-shaped steel purlin through the upper end plate, and the lower part of the second diagonal brace is connected to the cap foundation through the lower end plate;

[0030] Step 10: Pressurize the H-shaped steel bracing system through prestressed online compensation components. After the pressurization is completed, the pile side counter-pressure soil and other area earthwork excavation can be carried out;

[0031] Step 11: Construct the basement raft and main structure. After the designed support removal conditions are met, release the internal stress of the support through prestressed online compensation components and remove the H-steel diagonal bracing system one by one.

[0032] 3. Beneficial effects

[0033] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0034] The diagonal bracing system of the present invention provides downward restraining force through the back pressure bracket, thereby ensuring that the connection between the H-shaped steel diagonal bracing system and the retaining pile will not deviate, thereby ensuring the overall stability of the diagonal bracing system; the H-shaped steel diagonal bracing system is simultaneously connected to multiple groups of H-shaped steel purlins through the upper end plate, thereby improving the overall safety of the foundation pit support;

[0035] The bottom of the H-shaped steel diagonal bracing system is supported by the pedestal foundation. The H-shaped steel diagonal bracing system does not need to be cut, and there will be no waste of materials. The H-shaped steel diagonal bracing system has built-in prestressed online compensation components, through which the prestressed online adjustment can be performed, providing guarantee for the supporting force of the H-shaped steel diagonal bracing system and the support safety of the foundation pit. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is the overall structure diagram of the present invention;

[0037] Figure 2 It is a partial assembly diagram of the H-beam diagonal bracing system of the present invention;

[0038] Figure 3 It is a schematic diagram of a partially enlarged structure of the present invention.

[0039] In the figure: 1. H-shaped steel diagonal bracing system; 101. first diagonal bracing member; 102. second diagonal bracing member; 103. prestressed in-line compensation member; 2. pedestal foundation; 3. lower end plate; 4. retaining piles; 5. counter-pressure connection assembly; 501. counter-pressure corbel; 502. supporting corbel; 503. H-shaped steel purlin; 504. spacer corbel; 6. upper end plate; 7. basement raft slab; 8. pedestal foundation supporting piles; 9. counter-pressure soil beside piles. DETAILED DESCRIPTION

[0040] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0041] Example 1

[0042] from Figure 1-3 It can be seen that the prestressed inclined bracing system with online compensation in this embodiment includes an H-shaped steel inclined bracing system 1, a cap foundation 2 and a retaining pile 4, and the H-shaped steel inclined bracing system 1 is inclinedly arranged between the cap foundation 2 and the retaining pile 4;

[0043] A counter-pressure connection assembly 5 is provided at the upper part of the H-shaped steel bracing system 1, and the counter-pressure connection assembly 5 includes a counter-pressure corbel 501, a supporting corbel 502 and an H-shaped steel purlin 503;

[0044] The counter-pressure corbel 501 and the supporting corbel 502 are fixed at intervals on the outside of the retaining pile 4. The counter-pressure corbel 501 and the supporting corbel 502 are both arranged horizontally. An H-shaped steel purlin 503 is arranged between the counter-pressure corbel 501 and the supporting corbel 502.

[0045] The upper part of the H-shaped steel bracing system 1 is connected to the retaining pile 4 through the back pressure connection assembly 5 , and the lower part of the H-shaped steel bracing system 1 is connected to the cap foundation 2 .

[0046] A lower end plate 3 is provided at the connection between the H-shaped steel diagonal bracing system 1 and the cap foundation 2, and two ends of the lower end plate 3 are respectively fixed to the H-shaped steel diagonal bracing system 1 and the cap foundation 2.

[0047] An upper end plate 6 is provided at the connection between the H-shaped steel bracing system 1 and the H-shaped steel purlin 503 .

[0048] The H-shaped steel purlins 503 may be provided in one or more groups. When multiple groups of H-shaped steel purlins 503 are provided, a spacing corbel 504 is provided between two adjacent groups of H-shaped steel purlins 503 , and the outer surfaces of the multiple groups of H-shaped steel purlins 503 are commonly connected to the upper end plate 6 .

[0049] The diagonal bracing system of the present invention is made of finished steel sections, which are reliable in quality, intuitive and easy to control, can be connected to each other through simple processing, and have a high material recycling rate.

[0050] Example 2

[0051] from Figure 1-3 It can be seen that the present embodiment is a prestressed diagonal brace system with online compensation, the H-shaped steel diagonal brace system 1 comprises a first diagonal brace member 101 and a second diagonal brace member 102, a prestressed online compensation member 103 is provided at the connection between the first diagonal brace member 101 and the second diagonal brace member 102, and the two ends of the prestressed online compensation member 103 are respectively connected to the first diagonal brace member 101 and the second diagonal brace member 102 by bolts.

[0052] The prestressed online compensation member 103 has a self-locking function, which includes but is not limited to thread self-locking, pad self-locking or force box self-locking, so that the supporting force of the H-shaped steel bracing system can adapt to the temperature stress changes caused by temperature changes, thereby providing protection for the support safety of the foundation pit;

[0053] One end of the upper end plate 6 is fixed to the first diagonal brace 101, and can be fixed by any method such as welding, bolting or riveting, and the other end of the upper end plate 6 is connected to multiple groups of H-shaped steel purlins 503 by bolts;

[0054] One end of the lower end plate 3 is fixed to the second diagonal brace 102 , and can be fixed by any method such as welding, bolting or riveting, and the other end of the lower end plate 3 is fixed to the base foundation 2 .

[0055] The connection points between the H-shaped steel diagonal bracing system 1 and the cap foundation 2 or the back pressure connection assembly 5 are fixed by bolts, which is easy to disassemble.

[0056] A cap foundation support pile 8 is provided at the bottom of the cap foundation 2 to support the cap foundation 2;

[0057] When the H-shaped steel diagonal bracing system 1 is in use, an oblique force will be generated, and a downward restraining force will be provided through the counter-pressure corbel 501, thereby ensuring that the connection between the H-shaped steel diagonal bracing system 1 and the retaining pile 4 will not be offset, thereby ensuring the overall stability of the diagonal bracing system; the H-shaped steel diagonal bracing system 1 is connected to multiple groups of H-shaped steel purlins 503 at the same time through the upper end plate 6, thereby improving the overall safety and stability of the foundation pit support.

[0058] The bottom of the diagonal bracing system of the present invention is supported by a cap foundation 2. The H-shaped steel diagonal bracing system 1 does not need to be cut off, can adapt to different soil conditions, and does not cause material waste. The H-shaped steel diagonal bracing system 1 includes a first diagonal bracing member 101 and a second diagonal bracing member 102. A prestressed online compensation member 103 is provided at the connection between the first diagonal bracing member 101 and the second diagonal bracing member 102. The prestressed online compensation member 103 can be used to perform prestressed online adjustment, thereby providing protection for the supporting force of the H-shaped steel diagonal bracing system 1 and the support safety of the foundation pit.

[0059] The present invention supports the pedestal foundation 2 through the pedestal foundation support piles 8, and the lower part of the H-shaped steel diagonal bracing system 1 is fixed through the pedestal foundation 2, and no material is cut off; a prestressed online compensation component 103 is arranged in the H-shaped steel diagonal bracing system 1 to perform prestressed online adjustment, so that the supporting force of the H-shaped steel diagonal bracing system 1 is clear, and the safety of foundation pit support is guaranteed.

[0060] Example 3

[0061] from Figure 1-3 It can be seen that the construction method of a prestressed inclined brace system capable of online compensation in this embodiment is characterized by the following steps:

[0062] Step 1: construct the cap foundation support pile 8;

[0063] Step 2: Taking the setting of two layers of H-shaped steel purlins 503 as an example, a layer of earthwork is excavated to 600 mm below the lower end of the H-shaped steel purlin 503. After the excavation of a layer of earthwork is completed, the earthwork around the bottom cap foundation 2 is excavated synchronously, and the pile side counterpressure soil 9 is reserved at the pile side of the retaining pile 4;

[0064] Step 3: construct the cap foundation 2 and the lower end plate 3;

[0065] Step 4: Welding the supporting bracket 502;

[0066] Step 5: Install the first layer of H-shaped steel purlin 503, caulk the purlin, and weld the spacing bracket 504;

[0067] Step 6: Install the second-layer H-shaped steel purlin 503, caulk the purlin, and weld the top counter-pressure corbel 501;

[0068] Step 7: The H-beam bracing system 1 is processed in the factory, and the inclination angle of the H-beam bracing system 1 is fine-tuned on site according to the actual size;

[0069] Step 8: Grooving the pile side counter-pressure soil 9, assembling the first diagonal bracing member 101, the second diagonal bracing member 102, and the prestressed in-line compensation member 103, and then hoisting the entire H-shaped steel diagonal bracing system 1 into the groove;

[0070] Step nine: The upper end of the first diagonal brace 101 is connected to the H-shaped steel purlin 503 through the upper end plate 6, and the lower part of the second diagonal brace 102 is connected to the cap foundation 2 through the lower end plate 3;

[0071] Step 10: Pressurize the H-shaped steel bracing system 1 through the prestressed online compensation component 103. After the pressurization is completed, the pile side counter-pressure soil 9 and the remaining area earthwork excavation can be carried out;

[0072] Step 11: construct the basement raft 7 and the main structure. After the designed support removal conditions are met, release the support internal stress through the prestressed online compensation member 103, and remove the H-shaped steel diagonal bracing system 1 one by one.

[0073] The present invention and its embodiments are described schematically above, and the description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it and designs a structural method and an embodiment similar to the technical solution without creativity without departing from the purpose of the invention, they shall all fall within the protection scope of the present invention.

Claims

1. A prestressed online compensating diagonal bracing system, comprising an H-shaped steel diagonal bracing system (1), a cap foundation (2) and retaining piles (4), characterized in that: The H-shaped steel diagonal bracing system (1) is arranged obliquely between the cap foundation (2) and the retaining piles (4); The upper part of the H-shaped steel bracing system (1) is provided with a back-pressure connection assembly (5), and the back-pressure connection assembly (5) comprises a back-pressure corbel (501), a supporting corbel (502) and an H-shaped steel purlin (503); The counter-pressure corbel (501) and the supporting corbel (502) are fixed at intervals on the outside of the retaining pile (4), and an H-shaped steel purlin (503) is arranged between the counter-pressure corbel (501) and the supporting corbel (502); The upper part of the H-shaped steel bracing system (1) is connected to the retaining pile (4) via a back pressure connection assembly (5), and the lower part of the H-shaped steel bracing system (1) is connected to the cap foundation (2).

2. A prestressed online compensating diagonal brace system according to claim 1, characterized in that: A lower end plate (3) is provided at the connection between the H-shaped steel diagonal bracing system (1) and the pedestal foundation (2), and two ends of the lower end plate (3) are respectively fixed to the H-shaped steel diagonal bracing system (1) and the pedestal foundation (2).

3. The prestressed on-line compensating diagonal bracing system according to claim 2 is characterized in that: An upper end plate (6) is provided at the connection between the H-shaped steel bracing system (1) and the H-shaped steel purlin (503).

4. The prestressed online compensating diagonal bracing system according to claim 3 is characterized by: The H-shaped steel purlins (503) can be provided in one or more groups. When multiple groups of H-shaped steel purlins (503) are provided, a spacing bracket (504) is provided between two adjacent groups of H-shaped steel purlins (503), and the outer surfaces of the multiple groups of H-shaped steel purlins (503) are commonly connected to the upper end plate (6).

5. The prestressed on-line compensating diagonal bracing system according to claim 4 is characterized in that: The H-shaped steel diagonal bracing system (1) comprises a first diagonal bracing member (101) and a second diagonal bracing member (102), wherein a prestressed in-line compensation member (103) is provided at the connection between the first diagonal bracing member (101) and the second diagonal bracing member (102), and the two ends of the prestressed in-line compensation member (103) are respectively connected to the first diagonal bracing member (101) and the second diagonal bracing member (102) by bolts.

6. The prestressed on-line compensating diagonal bracing system according to claim 5 is characterized in that: The prestressed in-line compensation component (103) has a self-locking function, and the self-locking forms include but are not limited to thread self-locking, pad self-locking or force box self-locking.

7. The prestressed on-line compensating diagonal bracing system according to claim 5 is characterized in that: One end of the upper end plate (6) is fixed to the first diagonal brace (101), and the other end of the upper end plate (6) is connected to a plurality of groups of H-shaped steel purlins (503) by bolts; One end of the lower end plate (3) is fixed to the second diagonal support member (102), and the other end of the lower end plate (3) is fixed to the bearing base (2).

8. The prestressed on-line compensating diagonal bracing system according to claim 7 is characterized in that: A cap foundation support pile (8) is arranged at the bottom of the cap foundation (2).

9. The prestressed on-line compensating diagonal bracing system according to claim 7, characterized in that: The counter-pressure corbel (501) and the supporting corbel (502) are both arranged horizontally.

10. The construction method of a prestressed online compensating diagonal bracing system according to claim 8, characterized in that: The steps are: Step 1: constructing the cap foundation support piles (8); Step 2: Taking the setting of two layers of H-shaped steel purlins (503) as an example, a layer of earthwork is excavated to 600 mm below the lower end of the H-shaped steel purlin (503). After the excavation of a layer of earthwork is completed, the earthwork around the bottom cap foundation (2) is excavated synchronously, and the pile side counterpressure soil (9) is reserved at the pile side of the retaining pile (4); Step 3: construct the cap foundation (2) and the lower end plate (3); Step 4: Welding the supporting bracket (502); Step 5: Install a layer of H-shaped steel purlin (503), caulk the purlin, and weld the spacing bracket (504); Step 6: Install the second-layer H-shaped steel purlin (503), fill the purlin seams, and weld the top counter-pressure bracket (501); Step 7: The H-shaped steel bracing system (1) is processed in the factory, and the inclination angle of the H-shaped steel bracing system (1) is fine-tuned on site according to the actual size; Step 8: Carve a groove in the pile side counter-pressure soil (9), assemble the first diagonal brace (101), the second diagonal brace (102), and the prestressed in-line compensation member (103), and then hoist the entire H-shaped steel diagonal brace system (1) into the groove; Step nine: the upper end of the first diagonal bracing member (101) is connected to the H-shaped steel purlin (503) through the upper end plate (6), and the lower part of the second diagonal bracing member (102) is connected to the cap foundation (2) through the lower end plate (3); Step 10: Pressurize the H-shaped steel bracing system (1) through the prestressed online compensation component (103). After the pressurization is completed, the pile side counter-pressure soil (9) and the excavation of the remaining area can be carried out; Step 11: construct the basement raft slab (7) and the main structure. After the designed support removal conditions are met, release the support internal stress through the prestressed online compensation component (103) and remove the H-shaped steel diagonal bracing system (1) one by one.

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