Inner supporting structure and method for foundation pit beam lattice system

Abstract

The invention discloses a foundation pit beam lattice system inner supporting structure and method, and the method comprises the following steps that pressurizing parts, transverse supporting parts, at least two vertical supporting parts and connecting flower stands are included, the pressurizing parts are arranged on the two sides of the transverse supporting parts respectively, and the vertical supporting parts are arranged in the length direction of the transverse supporting parts; the connecting flower stand is arranged between the adjacent supporting pieces in the transverse supporting part, and the pressurizing parts at the two ends abut against the side wall of the foundation pit to be supported; the structural system provided by the scheme is efficient and safe in stress, the steel consumption is reduced on the premise that the stability is met, the scheme is economical and reliable, meanwhile, the simple structural system also reduces the construction difficulty and improves the construction efficiency, all materials of the structure can be recycled, and the novel structural system is efficient, environmentally friendly and capable of achieving sustainable development. Through rigorous theoretical calculation and test verification, the structural system can completely replace a traditional scheme, and has the advantages of being efficient in stress, good in safety performance, high in construction efficiency, capable of being combined flexibly and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation pit engineering, and in particular to an internal support structure and method of a foundation pit beam grid system. Background Art

[0002] The supporting structure inside the foundation pit plays a key role in maintaining the stability of the foundation pit and preventing soil collapse in the foundation pit project. Although the traditional foundation pit support forms are diverse in form, they lack adaptability. The traditional internal support structure adopts the arrangement of transverse steel plate connection + oblique shear brace to increase the overall stability of the structure. The transverse connecting steel plate and the steel flange are connected by a bolt group. The force of this node is relatively complex. When the internal support steel undergoes lateral deformation, the bolt group is subjected to mixed bending and shear forces, and the actual load of the bolt group will change according to the degree of lateral deformation of the structure. Therefore, it is impossible to accurately calculate the force condition of the node, and there are certain safety hazards. At the same time, the traditional internal support structure's steel connection adopts a transverse connecting steel plate between the steel and the steel. The connecting plate is limited by the size and weight of the steel plate, and the installation phase requires the help of lifting equipment to complete.

[0003] Traditional internal support structures use transverse connecting steel plates between the sections, and high-strength bolts between the sections and the connecting plates. The high-strength bolts undergo final tightening inspections and have strict requirements for the on-site environment. Work is prohibited when the tightening surface is wet, such as with dew or rain. Tightening should be stopped immediately in rain, snow, or heavy fog. These requirements are designed to ensure that the preload of the high-strength bolts meets the requirements, thereby ensuring a secure and reliable gusset plate connection. Due to these factors, traditional internal support structures have low installation efficiency and are susceptible to environmental influences. If construction teams do not strictly follow operating procedures and engage in rough construction to expedite construction, safety risks may arise. Summary of the Invention

[0004] The purpose of the present invention is to provide an internal support structure and method for a foundation pit beam grid system to address the above-mentioned shortcomings, thereby solving the problems of low installation efficiency, susceptibility to environmental influences, and potential safety hazards in traditional internal support structures.

[0005] The present invention is achieved through the following solutions: A supporting structure in a foundation pit beam grid system comprises the following steps: a pressurizing part, a transverse supporting part, a vertical supporting part and a connecting flower rack, wherein the pressurizing part is respectively arranged on both sides of the transverse supporting part, at least two vertical supporting parts are arranged along the length direction of the transverse supporting part, and the connecting flower rack is arranged between adjacent supporting parts in the transverse supporting part, and the pressurizing parts at both ends respectively contact the side walls of the foundation pit to be supported.

[0006] Based on the above-mentioned internal support structure of the foundation pit beam grid system, the pressure part includes a servo mechanism, a first standard pressure part, a second standard pressure part and a third standard pressure part. The first standard pressure part and the second standard pressure part are respectively arranged at the two end positions of the transverse support part, and the end of the first standard pressure part away from the transverse support part is connected to the side wall of the foundation pit to be supported by an expansion bolt; the third standard pressure part and the second standard pressure part are spaced apart, and the servo mechanism is arranged between the second standard pressure part and the third standard pressure part, and the end of the third standard pressure part away from the transverse support part is connected to the side wall of the foundation pit to be supported by an expansion bolt.

[0007] Based on the above-mentioned internal support structure of the foundation pit beam grid system, the transverse support part includes a plurality of parallel transverse connecting members, and adjacent transverse connecting members are connected as a whole through connecting flower racks; the transverse connecting members include standard support members and spliced ​​node plates, and the standard support members are connected to a predetermined length through the spliced ​​node plates.

[0008] Based on the above-mentioned internal support structure of the foundation pit beam grid system, the standard support member is an I-beam, and connecting holes that cooperate with the connecting flower racks are provided on the upper and lower end faces of adjacent I-beams. The connecting holes on the upper and lower end faces are symmetrically arranged on the upper and lower end faces along the central support plate of the I-beam, and the connecting flower racks are respectively arranged on the upper and lower end faces of adjacent standard support members through the connecting holes.

[0009] Based on the above-mentioned internal support structure of the foundation pit beam grid system, the connecting flower rack includes a first horizontal rod, a second horizontal rod and a supporting diagonal rod. The first horizontal rod and the second horizontal rod are arranged in parallel, and the supporting diagonal rods are staggered between the first horizontal rod and the second horizontal rod. The supporting diagonal rods are fixedly connected to both ends of the first horizontal rod and the second horizontal rod.

[0010] Based on the above-mentioned support structure in the foundation pit beam grid system, the vertical support part includes a plurality of support units arranged in parallel along the length direction of the horizontal support part, and the support unit as a whole is a gate-shaped structure; the support unit includes a vertical support column, a support beam and a T-shaped bracket; the vertical support columns are provided with at least 2, and the end faces of adjacent vertical support columns are provided in parallel, the T-shaped bracket is provided at the upper end part of the vertical support column, the support beam is provided on the T-shaped bracket of the adjacent vertical support column, and the vertical support column, support beam and T-shaped bracket form a gate-shaped structure.

[0011] Based on the above-mentioned internal support structure of the foundation pit beam grid system, the standard support member and its corresponding support beam are locked by a locking assembly, and the locking assembly includes a steel back rib and a pull rod. The steel back ribs are respectively in contact with the standard support member and the support beam where they are located, and the pull rod vertically connects adjacent steel back ribs.

[0012] Based on the above-mentioned internal support structure of the foundation pit beam grid system, the locking assembly specifically includes a first steel section, a second steel section, a third steel section, a fourth steel section and a pull rod; the first steel section and the second steel section are arranged in parallel on the same horizontal plane, and the third steel section and the fourth steel section are arranged in parallel on the same horizontal plane; the first steel section, the second steel section, the third steel section and the fourth steel section are all provided with through holes for the pull rod to pass through; the first steel section and the second steel section are arranged at the bottom position of the supporting beam, and the third steel section and the fourth steel section are arranged at the top position of the standard support member; the pull rod vertically passes through the through holes of the third steel section that are respectively opposite to the first steel section and the second steel section, and the through holes of the fourth steel section that are respectively opposite to the first steel section and the second steel section.

[0013] Based on the above-mentioned internal support structure of the foundation pit beam grid system, the transverse connecting members are set to two, three or four along the length direction of the supporting beam; the side walls of the foundation pit to be supported are diagonal supports or opposite side supports.

[0014] This solution also provides a method for supporting the foundation pit beam grid system, comprising the following steps: Step 1: Determine the layout of the inner support braces and angle braces according to the foundation pit support requirements, and specify the number of supporting steel sections for a single brace and angle brace; determine the location of the portal support steel frame according to the stability requirements of the support structure; Step 2: Position the portal support steel frame columns according to the construction plan and in combination with the construction technology level and machinery combination, and use the driving machine to construct the portal support frame columns; simultaneously construct the foundation pit retaining structure; Step 3: Excavate the foundation pit to the designed position according to the design plan, construct the waist beam and concrete corbel, and adopt the synchronous construction method to ensure the installation accuracy of the standard pressure parts and anchor bolts when pouring the concrete corbel. That is, first fix the anchor bolts to the standard pressure parts, and then synchronously position the anchor bolts and standard pressure parts to the corbel to be embedded according to the layout point and pour concrete; Step 4: Weld the T-shaped bracket of the portal support frame according to the designed elevation, and install the transverse steel beam to the T-shaped bracket, and connect the two with bolts; Step 5: According to the number of internal support steel and connecting flower racks required by the design, the internal support steel and the connecting flower racks are assembled in modules. The internal support steel is combined with standard and non-standard parts. The connection nodes are connected with connecting plates and bolts, and the connecting flower racks and support steel are connected with pins. The assembled modular structure is hoisted as a whole to the top of the horizontal steel beam of the portal support frame. The nodes between modules are fixed with connecting plates and bolts until all the support steel are installed. After measuring the verticality of the support steel to meet the requirements, proceed to the next step. Step 6: Use the lock to lock the supporting steel and the transverse steel beam; the lock is composed of 4 steel back ribs and 4 steel tie rods. When locking, first pass one end of the 4 steel tie rods through 2 back ribs, install the pads and bolts, and then pass the steel tie rods from bottom to top to the top of the supporting steel. At this time, the 2 installed back ribs are pressed against the bottom of the transverse steel beam, and then the remaining 2 back ribs are passed through the steel tie rods and pressed against the top of the supporting steel. Install the pads and nuts to lock; Step 7: Connect one end of the supporting steel to the standard pressure parts embedded in the third step through bolts; install two sets of pressure standard parts at the other end of the supporting steel, and connect the pressure standard parts with bolts.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. This solution provides support for the horizontal support part through the vertical support part, and provides auxiliary support for the support members in the horizontal support part by connecting the flower rack, so that the various support members in the entire horizontal support part form a stable support system. Pressurization parts are set on both sides to provide continuous pre-pressure for the internal support structure to ensure that the internal support structure fits tightly with the inner wall of the foundation pit.

[0016] 2. This proposal provides a structural system that is efficient and safe in terms of load bearing, reduces steel usage while ensuring stability, and is economical and reliable. Furthermore, its simple structure reduces construction difficulty and improves efficiency. All structural materials are recyclable, making it a highly efficient, environmentally friendly, and sustainable new structural system. Through rigorous theoretical calculations and experimental verification, this structural system is fully capable of replacing traditional solutions, offering advantages such as efficient load bearing, excellent safety performance, high construction efficiency, and flexible assembly capabilities. By utilizing prefabrication and assembly technologies, the structure is modularized, significantly shortening the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall top view of the present invention; Figure 2 It is a schematic side view of the overall structure of the present invention; Figure 3 It is a schematic diagram of the top view of the structure of the flower stand connected in the invention; Figure 4 This is a front view of the lock assembly in the invention; Figure 5 A side view of the lock assembly of the invention; Figure 6 It is a side view structural diagram of the vertical support portion in the invention; Figure 7 This is a schematic diagram of the side wall of the foundation pit to be supported as a diagonal support; Markings in the figure: 1. Pressurizing part; 2. Horizontal supporting part; 3. Vertical supporting part; 4. Connecting flower rack; 5. Side wall of foundation pit; 11. Servo mechanism; 12. First standard pressurizing part; 13. Second standard pressurizing part; 14. Third standard pressurizing part; 21. Standard supporting part; 22. Spliced ​​node plate; 23. Connecting hole; 31. Vertical supporting column; 32. Supporting beam; 33. T-shaped bracket; 41. First horizontal rod; 42. Second horizontal rod; 43. Supporting diagonal rod; 61. First steel section; 62. Second steel section; 63. Third steel section; 64. Fourth steel section; 65. Pull rod. DETAILED DESCRIPTION

[0018] All features disclosed in this specification, or all steps in the disclosed methods or processes, except mutually exclusive features and / or steps, can be combined in any manner.

[0019] Any feature disclosed in this specification (including any appended claims and abstract), unless otherwise stated, may be replaced by other equivalent or similar features. In other words, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0020] In the description of the present invention, it should be understood that the terms "up", "down", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0021] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features being referred to. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of such features.

[0022] Example 1 like Figures 1 to 7 As shown, the present invention provides a technical solution: A supporting structure within a foundation pit beam grid system, which at least includes but is not limited to a pressurizing part 1, a transverse supporting part 2, a vertical supporting part 3 and a connecting flower rack 4. The pressurizing part 1 is respectively arranged on both sides of the transverse supporting part 2, at least two vertical supporting parts 3 are arranged along the length direction of the transverse supporting part 2, and the connecting flower rack 4 is arranged between adjacent supporting parts in the transverse supporting part 2. The pressurizing parts 1 at both ends respectively contact the side walls 5 of the foundation pit to be supported.

[0023] Based on the above structure, the vertical support part 3 provides support for the horizontal support part 2, and the flower rack 4 is connected to provide auxiliary support for the support members in the horizontal support part 2, so that the various support members in the entire horizontal support part 2 form a stable support system. The pressure part 1 is set on both sides to provide continuous pre-pressure for the internal support structure to ensure that the internal support structure fits tightly with the inner wall of the foundation pit.

[0024] As an example, the pressurizing part 1 includes a servo mechanism 11, a first standard pressurizing part 12, a second standard pressurizing part 13 and a third standard pressurizing part 14. The first standard pressurizing part 12 and the second standard pressurizing part 13 are respectively arranged at the two end positions of the transverse support part 2. The end of the first standard pressurizing part 12 away from the transverse support part 2 is connected to the side wall 5 of the foundation pit to be supported by an expansion bolt; the third standard pressurizing part 14 is spaced apart from the second standard pressurizing part 13, and the servo mechanism 11 is arranged between the second standard pressurizing part 13 and the third standard pressurizing part 14. The end of the third standard pressurizing part 14 away from the transverse support part 2 is connected to the side wall 5 of the foundation pit to be supported by an expansion bolt.

[0025] Based on the above structure, by setting a servo mechanism 11 on one side of the lateral support part 2, a stable thrust can be applied to the entire lateral support part 2 to ensure that the inner support structure fits tightly with the inner wall of the foundation pit, and the first standard pressure member 12 and the third standard pressure member 14 are connected to the side wall 5 of the foundation pit to be supported through concrete, making the entire connection more stable.

[0026] As an example, the transverse support portion may include multiple parallel transverse connectors, and adjacent transverse connectors are connected as a whole through the connecting flower rack 4; the transverse connectors may include standard support members 21 and spliced ​​node plates 22, and the standard support members 21 are connected to a predetermined length through the spliced ​​node plates 22.

[0027] Based on the above structure, when supporting the interior of the foundation pit, since the specific length that needs to be supported is unknown, the entire horizontal connector needs to be spliced ​​together by multiple standard support members 21 and spliced ​​node plates 22. In this way, the support of the inner wall of the foundation pit of a predetermined length can be completed quickly and efficiently. At the same time, by connecting the flower rack 4 to the adjacent standard support members 21, the horizontal connector can form a frame system, thereby forming a stable support.

[0028] As an example, the standard support member 21 can be an I-beam, and connecting holes 23 that cooperate with the connecting flower rack 4 are provided on the upper and lower end faces of adjacent I-beams. The connecting holes 23 on the upper and lower end faces are symmetrically arranged on the upper and lower end faces along the center support plate of the I-beam, and the connecting flower rack 4 is respectively arranged on the upper and lower end faces of adjacent standard support members 21 through the connecting holes 23.

[0029] Based on the above structure, since the upper and lower end surfaces of adjacent standard support members 21 need to cooperate with the connecting flower rack 4, connecting holes 23 are provided at the upper and lower ends of the standard support members 21 to provide assembly space for the connection of the connecting flower rack 4.

[0030] As an example, the connecting flower rack 4 may include a first horizontal rod 41, a second horizontal rod 42 and a supporting diagonal rod 43. The first horizontal rod 41 and the second horizontal rod 42 are arranged in parallel, and the supporting diagonal rod 43 is staggered between the first horizontal rod 41 and the second horizontal rod 42. The supporting diagonal rod 43 is fixedly connected to both ends of the first horizontal rod 41 and the second horizontal rod 42.

[0031] Based on the above structure, when the connecting flower rack 4 is assembled between adjacent standard support members 21, the first horizontal rod 41 and the second horizontal rod 42 can avoid lateral movement between adjacent standard support members 21. At the same time, the staggered support diagonal bars can avoid longitudinal movement between adjacent standard support members 21, ultimately making the entire structure more stable. At the same time, the arrangement at the upper and lower ends of adjacent standard support members 21 can improve the overall support strength.

[0032] As an example, the vertical support portion 3 may include a plurality of support units arranged in parallel along the length direction of the horizontal support portion 2, and the support units are generally door-shaped structures.

[0033] Based on the above structure, a plurality of support units arranged in parallel can provide stable support for the transverse support portion 2, and at the same time, arranging the support unit as a door-type structure can make the support strength of a single support unit greater.

[0034] As an example, the support unit may include a vertical support column 31, a support beam 32 and a T-shaped bracket 33; the vertical support column 31 is set to at least 2, and the end faces of adjacent vertical support columns 31 are set in parallel, the T-shaped bracket 33 is set at the upper end of the vertical support column 31, and the support beam 32 is set on the T-shaped bracket 33 of the adjacent vertical support column 31. The vertical support column 31, the support beam 32 and the T-shaped bracket 33 form a door-type structure.

[0035] Based on the above structure, vertical support force is provided by the vertical support column 31, support is provided for the standard support member 21 by the support beam, and the gravity of the horizontal support part 2 is dispersed by multiple support beams arranged in parallel, making the entire vertical support system more stable.

[0036] As an example, the standard support member 21 and its corresponding support beam 32 are locked by a locking assembly. The locking assembly may include a steel back rib and a pull rod 65. The steel back ribs are respectively in contact with the standard support member 21 and the support beam 32 where they are located, and the pull rod 65 vertically connects adjacent steel back ribs.

[0037] Based on the above structure, the standard support member 21 and the support joist 32 are connected as a whole through the steel back rib and the tie rod 65, and cannot move left and right or up and down.

[0038] As an example, the lock assembly may include a first steel section 61, a second steel section 62, a third steel section 63, a fourth steel section 64, and a pull rod 65; the first steel section 61 and the second steel section 62 are arranged in parallel on a horizontal plane, and the third steel section 63 and the fourth steel section 64 are arranged in parallel on a horizontal plane; the first steel section 61, the second steel section 62, the third steel section 63, and the fourth steel section 64 are all provided with a through hole for the pull rod 65 to pass through; The first steel section 61 and the second steel section 62 are arranged at the bottom position of the support beam 32, and the third steel section 63 and the fourth steel section 64 are arranged at the top position of the standard support member 21; the pull rod 65 vertically passes through the through holes of the third steel section 63 that are respectively opposite to the first steel section 61 and the second steel section 62, and the through holes of the fourth steel section 64 that are respectively opposite to the first steel section 61 and the second steel section 62, so that the standard support member 21 is restricted in all directions.

[0039] As an example, the number of transverse connectors may be two, three, or four along the length of the support joist 32 .

[0040] As an example, the side wall 5 of the foundation pit to be supported can be a diagonal support or a side support.

[0041] This solution provides a structural system that is efficient and safe in terms of load bearing, reduces steel usage while ensuring stability, and is economical and reliable. Furthermore, the simple structure reduces construction difficulty and improves efficiency. All structural materials are recyclable, making it a highly efficient, environmentally friendly, and sustainable new structural system. Through rigorous theoretical calculations and experimental verification, this structural system is fully capable of replacing traditional solutions, offering advantages such as efficient load bearing, excellent safety performance, high construction efficiency, and flexible assembly capabilities. By utilizing prefabrication and assembly technologies, the structure is modularized, significantly shortening the construction period.

[0042] Example 2 Based on the structure of the above embodiment 1, this embodiment provides a technical solution: A method for internal support of a foundation pit beam grid system, comprising the following steps: Step 1: Determine the layout of the inner support braces and angle braces according to the foundation pit support requirements, and clarify the number of supporting steel sections for single-track braces and angle braces; determine the position of the portal support steel frame according to the stability requirements of the supporting structure.

[0043] Step 2: Position the portal support steel frame columns according to the construction plan and in combination with the construction technology level and machinery combination. Use specialized driving machinery to construct the portal support frame columns. Simultaneously construct the foundation pit retaining structure.

[0044] Step 3: Excavate the foundation pit to the designed position according to the design plan, construct the waist beam and concrete corbel, and adopt the synchronous construction method to ensure the installation accuracy of the standard pressure parts and anchor bolts when pouring the concrete corbel, that is, first fix the anchor bolts to the standard pressure parts, and then synchronously position the anchor bolts and standard pressure parts to the corbel to be embedded according to the layout point and pour concrete.

[0045] Step 4: Weld the portal support frame T-shaped bracket 33 according to the design elevation, and install the transverse steel beam to the T-shaped bracket 33. The two are connected by bolts for easy disassembly and reuse.

[0046] Step 5: Based on the required number of internal support steel sections and the number of connecting flower racks 4, assemble the internal support steel sections and the connecting flower racks 4 in modules. The internal support steel sections can be combined with standard and non-standard parts to meet the needs of foundation pits of different spans. The connection nodes are connected with connecting plates and bolts, and the connecting flower racks 4 and the support steel sections are connected with pins. The assembled modular structure is hoisted as a whole to the top of the horizontal steel beam of the portal support frame. The nodes between the modules are fixed with connecting plates and bolts until all the support steel sections are installed. After measuring the verticality of the support steel sections and confirming that it meets the requirements, proceed to the next step.

[0047] Step 6: Use the lock to lock the supporting steel and the transverse steel beam. The lock is composed of four steel back ribs and four steel tie rods 65. When locking, first pass one end of the four steel tie rods 65 through two back ribs, install the pads and bolts, and then pass the steel tie rods 65 from bottom to top to the top of the supporting steel. At this point, the two installed back ribs are pressed against the bottom of the transverse steel beam. Then, pass the remaining two back ribs through the steel tie rods 65 and press them against the top of the supporting steel. Install the pads and nuts to lock.

[0048] Step 7: Connect one end of the supporting steel to the standard pressure parts embedded in the third step through bolts; install two sets of pressure standard parts at the other end of the supporting steel, and connect the pressure standard parts with bolts.

[0049] Step 8: Install the servo mechanism 11 between the two pressurized standard components. The servo mechanism 11 has pre-set bolt holes for securing it to the bolt holes of the standard pressurized components. Control the servo mechanism's pressurization according to the required preload, completing the internal support structure installation and proceeding to the next step.

[0050] The present scheme mainly consists of supporting steel, node connection steel plates, supporting flower racks, standard pressure parts, servo mechanisms 11, locks, temporary supporting steel frames, etc.

[0051] The new beam grid system features a portal support frame at its base, providing a vertical fulcrum for the supporting steel sections and ensuring their free length. The portal support frame consists of steel columns, T-shaped brackets 33, and transverse steel beams. The brackets are welded to the columns according to elevation requirements, while the transverse steel beams are bolted to the brackets. Support steel sections are installed atop the portal support frame. The number of combinations can be determined based on the pit support requirements. Node plates and bolts are used to extend individual sections of supporting steel, and connecting brackets 4 allow for flexible combinations between sections. Because the portal support frame is affected by the construction surface and positioning accuracy, the supporting steel sections are connected to the portal frame using a locking mechanism. The locking mechanism consists of four steel back ribs and four tie rods 65. The tie rods 65 can be adjusted to the back ribs to accommodate on-site connection requirements.

[0052] The end of the supporting steel is connected to the pressurized standard part, close to the side of the concrete corbel. The pressurized standard part and the concrete corbel are connected by anchor bolts. A servo mechanism 11 is installed between the two pressurized standard parts to provide continuous preload for the inner support structure and ensure that the inner support structure fits tightly with the inner wall of the foundation pit.

[0053] Attachment Figure 5 : The supporting flower stand is welded with channel steel, and the flower stand and the steel section are connected by a pin. The pin is made of high-strength alloy steel, and the aperture gap between the pin and the pin hole is 0.5mm, which can meet the integrity requirements of the connection between the flower stand and the steel section while ensuring the force.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A foundation pit beam grid system internal support structure, characterized in that: The method comprises the following steps: a pressurizing part, a transverse supporting part, a vertical supporting part and a connecting flower rack, wherein the pressurizing part is respectively arranged on both sides of the transverse supporting part, at least two vertical supporting parts are arranged along the length direction of the transverse supporting part, and the connecting flower rack is arranged between adjacent supporting parts in the transverse supporting part, and the pressurizing parts at both ends respectively conflict with the side walls of the foundation pit to be supported.

2. The internal support structure of the foundation pit beam grid system according to claim 1, characterized in that: The pressurizing part includes a servo mechanism, a first standard pressurizing part, a second standard pressurizing part and a third standard pressurizing part. The first standard pressurizing part and the second standard pressurizing part are respectively arranged at the two end positions of the transverse support part, and the end of the first standard pressurizing part away from the transverse support part is connected to the side wall of the foundation pit to be supported by an expansion bolt; the third standard pressurizing part and the second standard pressurizing part are spaced apart, and the servo mechanism is arranged between the second standard pressurizing part and the third standard pressurizing part, and the end of the third standard pressurizing part away from the transverse support part is connected to the side wall of the foundation pit to be supported by an expansion bolt.

3. The internal support structure of the foundation pit beam grid system according to claim 2, characterized in that: The transverse support portion includes a plurality of parallel transverse connectors, and adjacent transverse connectors are connected as a whole through connecting flower racks; the transverse connectors include standard support members and spliced ​​node plates, and the standard support members are connected to a predetermined length through the spliced ​​node plates.

4. The internal support structure of the foundation pit beam grid system according to claim 3, characterized in that: The standard support member is an I-beam, and connecting holes that cooperate with the connecting flower racks are provided on the upper and lower end faces of adjacent I-beams. The connecting holes on the upper and lower end faces are symmetrically arranged on the upper and lower end faces along the central support plate of the I-beam, and the connecting flower racks are respectively arranged on the upper and lower end faces of adjacent standard support members through the connecting holes.

5. The internal support structure of the foundation pit beam grid system according to claim 4, characterized in that: The connecting flower rack includes a first horizontal rod, a second horizontal rod and a supporting oblique rod. The first horizontal rod and the second horizontal rod are arranged in parallel. The supporting oblique rod is staggered between the first horizontal rod and the second horizontal rod. The supporting oblique rod is fixedly connected to both ends of the first horizontal rod and the second horizontal rod.

6. The internal support structure of the foundation pit beam grid system according to claim 5, characterized in that: The vertical support portion includes a plurality of support units arranged in parallel along the length direction of the horizontal support portion, and the support unit as a whole is a door-shaped structure; the support unit includes a vertical support column, a support joist and a T-shaped bracket; the vertical support columns are provided with at least 2, and the end faces of adjacent vertical support columns are provided in parallel, the T-shaped bracket is provided at the upper end portion of the vertical support column, the support joist is provided on the T-shaped bracket of the adjacent vertical support column, and the vertical support column, support joist and T-shaped bracket form a door-shaped structure.

7. The internal support structure of the foundation pit beam grid system according to claim 6, characterized in that: The standard support member and its corresponding support beam are locked by a locking assembly, and the locking assembly includes a steel back rib and a pull rod. The steel back ribs are respectively in contact with the standard support member and the support beam where they are located, and the pull rod vertically connects adjacent steel back ribs.

8. The internal support structure of the foundation pit beam grid system according to claim 7, characterized in that: The locking assembly specifically includes a first steel section, a second steel section, a third steel section, a fourth steel section and a pull rod; the first steel section and the second steel section are arranged in parallel on a horizontal plane, and the third steel section and the fourth steel section are arranged in parallel on a horizontal plane; the first steel section, the second steel section, the third steel section and the fourth steel section are all provided with through holes for the pull rod to pass through; the first steel section and the second steel section are arranged at the bottom position of the supporting beam, and the third steel section and the fourth steel section are arranged at the top position of the standard support member; the pull rod vertically passes through the through holes of the third steel section that are respectively opposite to the first steel section and the second steel section, and the through holes of the fourth steel section that are respectively opposite to the first steel section and the second steel section.

9. The foundation pit beam grid system internal support structure according to claim 8, characterized in that: The transverse connecting members are arranged in two, three or four pieces along the length direction of the supporting beam; the side walls of the foundation pit to be supported are diagonal supports or opposite side supports.

10. A method for supporting a foundation pit beam grid system, characterized in that: The following steps are involved: Step 1: Determine the layout of the inner support braces and angle braces according to the foundation pit support requirements, and specify the number of supporting steel sections for a single brace and angle brace; determine the location of the portal support steel frame according to the stability requirements of the support structure; Step 2: Position the portal support steel frame columns according to the construction plan and in combination with the construction technology level and machinery combination, and use the driving machine to construct the portal support frame columns; simultaneously construct the foundation pit retaining structure; Step 3: Excavate the foundation pit to the designed position according to the design plan, construct the waist beam and concrete corbel, and adopt the synchronous construction method to ensure the installation accuracy of the standard pressure parts and anchor bolts when pouring the concrete corbel. That is, first fix the anchor bolts to the standard pressure parts, and then synchronously position the anchor bolts and standard pressure parts to the corbel to be embedded according to the layout point and pour concrete; Step 4: Weld the T-shaped bracket of the portal support frame according to the designed elevation, and install the transverse steel beam to the T-shaped bracket, and connect the two with bolts; Step 5: According to the number of internal support steel and connecting flower racks required by the design, the internal support steel and the connecting flower racks are assembled in modules. The internal support steel is combined with standard and non-standard parts. The connection nodes are connected with connecting plates and bolts, and the connecting flower racks and support steel are connected with pins. The assembled modular structure is hoisted as a whole to the top of the horizontal steel beam of the portal support frame. The nodes between modules are fixed with connecting plates and bolts until all the support steel are installed. After measuring the verticality of the support steel to meet the requirements, proceed to the next step. Step 6: Use the lock to lock the supporting steel and the transverse steel beam; the lock is composed of 4 steel back ribs and 4 steel tie rods. When locking, first pass one end of the 4 steel tie rods through 2 back ribs, install the pads and bolts, and then pass the steel tie rods from bottom to top to the top of the supporting steel. At this time, the 2 installed back ribs are pressed against the bottom of the transverse steel beam, and then the remaining 2 back ribs are passed through the steel tie rods and pressed against the top of the supporting steel. Install the pads and nuts to lock; Step 7: Connect one end of the supporting steel to the standard pressure parts embedded in the third step through bolts; install two sets of pressure standard parts at the other end of the supporting steel, and connect the pressure standard parts with bolts.

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