A supporting mechanism for foundation pit excavation

Abstract

The application relates to the technical field of building engineering, in particular to a supporting mechanism for foundation pit excavation, which comprises supporting walls, the supporting walls are in two rows, each row of the supporting walls comprises a plurality of Larsen steel sheet piles, the inner side of the supporting walls is relatively convex as a first pressing part, and the inner side of the supporting walls is relatively concave as a second pressing part; the inner sides of the two rows of the supporting walls are provided with pressure bearing seats, a plurality of supporting rods are arranged on each pressure bearing seat, the supporting rods can slide along the direction perpendicular to the wall surface of the supporting walls to support on the first pressing part or the second pressing part, so that all the Larsen steel sheet piles can be supported by the support of the supporting rods, the rigidity of the Larsen steel sheet piles and the part inserted into the soil, and the reliability during the supporting is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building engineering, in particular to a supporting mechanism for foundation pit excavation. BACKGROUND

[0002] Foundation pit support is an important technology in building engineering, aiming to support, reinforce and protect the surrounding soil of the foundation pit through various supporting structures to ensure its stability and safety.

[0003] In selecting the foundation pit support structure, various factors such as geological conditions, surrounding environment, construction technology, etc. need to be considered comprehensively; common foundation pit support structures include soil nailing wall, row pile support, anchor support and Larsen steel sheet pile support, etc.; among them, Larsen steel sheet pile is also called U-shaped steel sheet pile, when using Larsen steel sheet pile, first support the edge of the foundation pit through Larsen steel sheet, then support the two sides of Larsen steel sheet from the inside through support steel, due to the existence of machining error of Larsen steel sheet and installation error in construction process, there are many inconveniences in installing Larsen steel sheet pile.

[0004] To solve the above problems, in the related technology, such as Chinese patent CN114622576B, a supporting device with anti-collapse structure for trench excavation is disclosed, which realizes the connection of the hydraulic driving part with the anti-collapse pressure component through the hydraulic pipe with joint based on the hydraulic principle, and then controls the axial displacement of the movable end of the anti-collapse pressure component, so that the pressure bearing component abuts against the inside of the supporting wall, realizing the adjustable supporting length and reliable support of the supporting wall.

[0005] Although the above-mentioned supporting device with anti-collapse structure for trench excavation has the function of adjustable supporting length, it is found in actual use that the pressure bearing component is mainly supported on the inner convex Larsen steel sheet, and the hook end of the inner convex Larsen steel sheet is arranged inward, and the hook end of the outer convex Larsen steel sheet is arranged outward, under the pushing of the pressure bearing component, the hook end of the inner convex Larsen steel sheet will be separated from the hook end of the outer convex Larsen steel sheet, resulting in that the outer convex Larsen steel sheet still relies on its rigidity and the part inserted into the soil for support, thereby affecting the reliability of the support. SUMMARY

[0006] Therefore, it is necessary to provide a supporting mechanism for foundation pit excavation in view of the poor support reliability in the current foundation pit support process.

[0007] The above-mentioned purpose is realized by the following technical scheme:

[0008] A supporting mechanism for foundation pit excavation, comprising supporting walls, the supporting walls having two rows, each row of the supporting walls comprising a plurality of Larsen steel sheet piles, the inner side of the supporting walls having a portion protruding outward as a first pressing portion, and the inner side of the supporting walls having a portion recessing inward as a second pressing portion; the inner side of the two rows of the supporting walls each being provided with a pressure bearing seat, each of the pressure bearing seats being provided with a plurality of support rods, the support rods being capable of sliding in a direction perpendicular to the wall surface of the supporting walls to support on the first pressing portion or the second pressing portion.

[0009] Further, the support force generated by the support rods supporting on the first pressing portion is F1, and the support force generated by the support rods supporting on the second pressing portion is F2, F1 < F2.

[0010] Further, the supporting mechanism for foundation pit excavation further comprises a hydraulic drive assembly, the hydraulic drive assembly being configured to be capable of providing a driving force for the sliding of the support rods.

[0011] Further, the hydraulic drive assembly comprises a plurality of hydraulic cylinder bodies, the hydraulic cylinder bodies being inserted into the pressure bearing seats and being configured to be capable of receiving hydraulic fluid from the outside; the support rods being inserted into the hydraulic cylinder bodies.

[0012] Further, the supporting mechanism for foundation pit excavation further comprises a cutoff assembly, the cutoff assembly being configured to cut off the hydraulic pressure of the hydraulic fluid on the support rods when the support rods move outward by a distance greater than or equal to a preset distance.

[0013] Further, the cutoff assembly comprises two cutoff pieces, the two cutoff pieces being inserted into the hydraulic cylinder bodies and being respectively located on both sides of a liquid flow channel in the hydraulic cylinder bodies, the cutoff pieces being capable of elastically sliding in a direction perpendicular to the liquid flow channel and having corresponding first positions and second positions before and after sliding, when in the first positions, the two cutoff pieces simultaneously stop on both sides of the support rods; when in the second positions, the two cutoff pieces sealingly abut.

[0014] Further, the abutting surfaces of the two cutoff pieces are keyed together.

[0015] Further, all of the hydraulic cylinder bodies in the same group are in communication with each other.

[0016] Further, the supporting mechanism for foundation pit excavation further comprises a hydraulic drive member, the hydraulic drive member being configured to be capable of providing a driving force for the two pressure bearing seats to move in directions away from or close to each other, so as to adapt to two rows of the supporting walls having different intervals.

[0017] Further, the hydraulic drive member is a manual hydraulic bidirectional drive cylinder or an electric bidirectional hydraulic drive cylinder.

[0018] The beneficial effects of the present application are:

[0019] The supporting mechanism for foundation pit excavation provided by the present application supports the edges of the foundation pit through two rows of supporting walls first, then places two pressure receiving seats on the inner sides of the two rows of supporting walls respectively, and then drives the supporting rods to slide in a direction perpendicular to the wall surface of the supporting walls and towards the supporting walls to be supported on the first pressure receiving part or the second pressure receiving part, so that all the Larsen steel sheet piles can simultaneously support the foundation pit by relying on the support of the supporting rods, their own rigidity and the part inserted into the soil, thereby improving the reliability during supporting.

[0020] Further, the supporting force generated by the supporting rod supported on the first pressure receiving part is smaller than the supporting force generated by the supporting rod supported on the second pressure receiving part, so that in use, the Larsen steel sheet pile corresponding to the second pressure receiving part has a tendency to move outward relative to the Larsen steel sheet pile corresponding to the first pressure receiving part, and further, the hook ends of the two adjacent Larsen steel sheet piles have a tendency to abut, thereby improving the connection stability between the two adjacent Larsen steel sheet piles and improving the sealing performance, so as to reduce the amount of external water and soil penetrating into the foundation pit through the gap between the two adjacent Larsen steel sheet piles.

[0021] Further, by providing the cutoff assembly, when the supporting rod moves outward by a distance greater than or equal to a preset distance during use, the hydraulic pressure of the hydraulic fluid on the supporting rod is cut off by the cutoff assembly, so that the supporting rod no longer supports the corresponding Larsen steel sheet pile, thereby avoiding damage to the Larsen steel sheet pile. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The supporting mechanism for foundation pit excavation provided by the present application provides a three-dimensional structure schematic diagram of the foundation pit supporting in use;

[0023] Figure 2 For Figure 1 The local enlarged structure schematic diagram at A in the middle;

[0024] Figure 3 The supporting mechanism for foundation pit excavation provided by the present application provides a three-dimensional structure schematic diagram of the foundation pit supporting in use;

[0025] Figure 4 The supporting mechanism for foundation pit excavation provided by the present application provides a three-dimensional structure schematic diagram of the foundation pit supporting in use;

[0026] Figure 5A stereoscopic sectional structure schematic view of a pressure bearing seat, a support rod, a communication pipe, a hydraulic cylinder body and a cutting assembly of a supporting mechanism for foundation pit excavation provided by the embodiment of the present application is shown in the assembling process;

[0027] Figure 6 For Figure 5 A local enlarged structure schematic view at B is shown in the middle;

[0028] Figure 7 For Figure 5 A local enlarged structure schematic view at C is shown in the middle.

[0029] Wherein:

[0030] 1, supporting wall; 11, Larsen steel sheet pile; 12, first pressure bearing part; 13, second pressure bearing part;

[0031] 2, pressure bearing seat; 21, support rod; 22, communication pipe;

[0032] 3, hydraulic cylinder body; 301, connecting channel;

[0033] 4, cutting assembly; 41, cutting piece; 42, compression spring;

[0034] 5, electric bidirectional hydraulic drive cylinder. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the present application clearer and more comprehensible, the present application is further described in detail below by means of embodiments and in conjunction with the drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0036] The serial numbers of the components in this paper, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequence or technical meaning. And the "connection" and "coupling" in this paper, unless otherwise specified, include direct and indirect connection (coupling). In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0037] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature is "on", "above" and "over" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature is "under", "below" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0038] As shown in Figures 1 to 7 , the supporting mechanism for foundation pit excavation provided by the embodiment of the present application is arranged to include supporting walls 1, the supporting walls 1 are in total two rows, each row of the supporting walls 1 includes a plurality of Larsen steel sheet piles 11, the inner side of the supporting walls 1 is arranged to have a first pressing part 12 which is relatively convex outward, and a second pressing part 13 which is relatively concave inward; the inner side of the two rows of the supporting walls 1 is arranged to have a pressure bearing seat 2, and each pressure bearing seat 2 is arranged to have a plurality of support rods 21, the support rods 21 are capable of sliding along a direction perpendicular to the wall surface of the supporting walls 1 to support on the first pressing part 12 or the second pressing part 13.

[0039] Specifically, as shown in Figure 1 , the two rows of the supporting walls 1 are arranged to support on both sides of the foundation pit respectively when in use, and are arranged along the extension direction of the foundation pit, and the supporting walls 1 are integrally arranged to have a corrugated structure.

[0040] Exemplarily, each row of the supporting walls 1 can be arranged to include thirty Larsen steel sheet piles 11, and the adjacent Larsen steel sheet piles 11 are arranged to be symmetrically centered.

[0041] The Larsen steel sheet piles 11 are arranged to have the lower half part vertically inserted into the soil body when in use; the first pressing part 12 is formed on the inner convex surface of the Larsen steel sheet pile 11 with the convex end inward, and the second pressing part 13 is formed on the inner concave surface of the Larsen steel sheet pile 11 with the convex end outward; as shown in Figure 2 , the two sides of the Larsen steel sheet pile 11 are arranged to have a hook end, the hook end is arranged to have an L-shaped structure, and the hook end of the Larsen steel sheet pile 11 with the convex end inward is arranged inward, the hook end of the Larsen steel sheet pile 11 with the convex end outward is arranged outward, and the hook ends of the adjacent Larsen steel sheet piles 11 with the convex end inward and the Larsen steel sheet piles 11 with the convex end outward are arranged to be hooked, so that when the support rods 21 only support on the Larsen steel sheet piles 11 with the convex end inward, the Larsen steel sheet piles 11 with the convex end inward and the Larsen steel sheet piles 11 with the convex end outward have a tendency to separate under the pushing of the support rods 21, thereby causing the supporting of the Larsen steel sheet piles 11 with the convex end outward to be unstable.

[0042] The pressure bearing seat 2 is arranged in a strip shape and has a rectangular cross section, and is arranged horizontally in use and parallel to the wall surface of the support wall 1.

[0043] It can be understood that the two pressure bearing seats 2 can be connected by a rack.

[0044] As shown in Figure 5 , the support rod 21 is arranged in a T shape and has a first columnar portion and a plate-shaped portion, wherein the first columnar portion is arranged with its axis perpendicular to the wall surface of the support wall 1 in installation, and is slidably inserted into the pressure bearing seat 2 with its inner end and is suspended on the outer side of the pressure bearing seat 2 with its outer end; the plate-shaped portion is perpendicularly arranged on the outer end of the first columnar portion and is pushed against the inner convex surface of the Larsen steel sheet pile 11 with the convex end facing inward or the inner concave surface of the Larsen steel sheet pile 11 with the convex end facing outward in use.

[0045] Exemplarily, the number of the support rods 21 can be twenty, and are divided into two groups, and the two groups of support rods 21 are respectively inserted into the two pressure bearing seats 2, and the ten support rods 21 in the same group are arranged at intervals along the extension direction of the pressure bearing seat 2.

[0046] It can be understood that, in order to facilitate the support rod 21 to abut against the first pressing portion 12 or the second pressing portion 13, the length of the first columnar portion of the support rod 21 can be adaptively adjusted; specifically, since the distance between the first pressing portion 12 and the center of the foundation pit is relatively short, the length of the first columnar portion of the support rod 21 corresponding to the first pressing portion 12 can be correspondingly set to be relatively short; since the distance between the second pressing portion 13 and the center of the foundation pit is relatively far, the length of the first columnar portion of the support rod 21 corresponding to the second pressing portion 13 can be correspondingly set to be relatively long.

[0047] In use, first, the edges of the foundation pit are supported by the two rows of support walls 1, then the two pressure bearing seats 2 are respectively placed on the inner sides of the two rows of support walls 1, then the support rods 21 are driven to slide in a direction perpendicular to the wall surface of the support wall 1 and towards the support wall 1, to be pushed against the inner convex surface of the Larsen steel sheet pile 11 with the convex end facing inward or the inner concave surface of the Larsen steel sheet pile 11 with the convex end facing outward, so that all the Larsen steel sheet piles 11 can simultaneously rely on the support of the support rods 21, their own rigidity and the part inserted into the soil to support the foundation pit, thereby facilitating to improve the reliability in support.

[0048] In further embodiments, in order to improve the sealing performance of the support wall 1, the support force generated by the support rod 21 supported on the first pressing portion 12 is F1, the support force generated by the support rod 21 supported on the second pressing portion 13 is F2, and F1 < F2.

[0049] During use, the Larson steel sheet pile 11 with the convex end facing inwards and the Larson steel sheet pile 11 with the convex end facing outwards both have a tendency to move outwards under the pushing of the support rod 21, and since the support force F1 generated by the support rod 21 supported on the Larson steel sheet pile 11 with the convex end facing inwards is smaller than the support force F2 generated by the support rod 21 supported on the Larson steel sheet pile 11 with the convex end facing outwards, the Larson steel sheet pile 11 with the convex end facing outwards has a tendency to move outwards relative to the Larson steel sheet pile 11 with the convex end facing inwards, and in turn, the Larson steel sheet pile 11 with the convex end facing outwards and the Larson steel sheet pile 11 with the convex end facing inwards have a tendency to be clamped by the hooks that are mutually clamped, thereby being able to improve the connection stability between the two adjacent Larson steel sheet piles 11, improve the stability during support, and improve the sealing performance, thereby being able to reduce the amount of water and soil from the outside penetrating into the foundation pit through the gap between the two adjacent Larson steel sheet piles 11, and being conducive to improving the reliability of the support.

[0050] In other embodiments, the support mechanism for foundation pit excavation is further provided with a hydraulic drive assembly configured to be able to provide a driving force for sliding the support rod 21.

[0051] During use, the support rod 21 is driven by the hydraulic drive assembly to slide along a direction perpendicular to the wall surface of the support wall 1 and towards the support wall 1, so as to push on the inner convex surface of the Larson steel sheet pile 11 with the convex end facing inwards or the inner concave surface of the Larson steel sheet pile 11 with the convex end facing outwards, and in turn, support the foundation pit through the support wall 1.

[0052] In further embodiments, the hydraulic drive assembly is provided with a plurality of hydraulic cylinders 3 inserted into the pressure bearing seat 2 and configured to be able to receive hydraulic fluid from the outside, and the support rod 21 is inserted into the hydraulic cylinder 3.

[0053] Specifically, as shown in Figure 5 the hydraulic cylinder 3 is provided in a T-shaped structure and has a second columnar portion and a block portion, the outer end of the block portion is fixedly installed on the inner side wall of the pressure bearing seat 2 close to the support wall 1, and the inner end is suspended, the outer end of the second columnar portion is installed perpendicularly on the inner end of the block portion, and the inner end is suspended; a columnar sink is formed on the outer side wall of the pressure bearing seat 2 close to the support wall 1, and the columnar sink sequentially passes through the block portion and the second columnar portion inwards and is coaxially arranged with the second columnar portion.

[0054] Exemplarily, the number of hydraulic cylinders 3 can be twenty, and they are divided into two groups, and the ten hydraulic cylinders 3 in each group are arranged in the extension direction of the pressure bearing seat 2, and the first columnar portion of the support rod 21 is inserted into the columnar sink during installation; correspondingly, ten columnar sinks are formed on each pressure bearing seat 2 and are arranged in the extension direction of the pressure bearing seat 2.

[0055] More specifically, in order to provide hydraulic fluid to the hydraulic cylinder 3, the support mechanism for foundation pit excavation can be configured to include twenty first hydraulic pumps, and the pump oil end of the first hydraulic pump is in communication with the columnar trench.

[0056] It can be understood that the hydraulic fluid can be hydraulic oil.

[0057] During use, after the two pressure seats 2 are placed on the inner side of the two rows of support walls 1, the first hydraulic pump is started, and the first hydraulic pump pumps hydraulic oil into the hydraulic cylinder 3. Under the action of the hydraulic pressure, the support rod 21 slides in a direction perpendicular to the wall surface of the support wall 1 and towards the support wall 1, so as to push on the inner convex surface of the Larson steel sheet pile 11 with the convex end facing inwards or the inner concave surface of the Larson steel sheet pile 11 with the convex end facing outwards, and then support the foundation pit through the support wall 1.

[0058] It can be understood that, in order to make the support force F1 generated by the support rod 21 supporting the Larson steel sheet pile 11 with the convex end facing inwards smaller than the support force F2 generated by the support rod 21 supporting the Larson steel sheet pile 11 with the convex end facing outwards, the pump oil pressure of the first hydraulic pump corresponding to the support rod 21 supporting the Larson steel sheet pile 11 with the convex end facing inwards can be set to be smaller than the pump oil pressure of the first hydraulic pump corresponding to the support rod 21 supporting the Larson steel sheet pile 11 with the convex end facing outwards.

[0059] In further embodiments, due to differences in soil structure, soil humidity, and the environment, some of the Larson steel sheet piles 11 supported by the soil may not need the additional support force provided by the support rod 21. When the support force of the support rod 21 is applied to this part of the soil, the upper half of the Larson steel sheet pile 11 is simultaneously subjected to the outward support force from the support rod 21 and the support force of the lower half of the Larson steel sheet pile 11, and the lower half of the Larson steel sheet pile 11 is subjected to the inward pushing force of the soil, so that the forces on the upper and lower halves of the Larson steel sheet pile 11 are uneven, and the force on the upper half is greater than the force on the lower half. Under the action of the resultant force, the Larson steel sheet pile 11 has a tendency to tilt outward, thereby easily leading to damage to the Larson steel sheet pile 11. To solve this problem, the support mechanism for foundation pit excavation further includes a cutting assembly 4, which is configured to cut off the hydraulic pressure of the hydraulic fluid on the support rod 21 when the outward movement distance of the support rod 21 is greater than or equal to a preset distance.

[0060] Specific to the present embodiment, the preset distance can be set according to requirements, such as 1mm, 2mm, etc. When the distance of the support rod 21 moving outward is greater than or equal to the preset distance, it indicates that the soil on the outer side of the Larsen steel sheet pile 11 pushed by the support rod 21 belongs to the case of not needing the additional support force brought by the support rod 21. In order to avoid damage to the Larsen steel sheet pile 11, the hydraulic pressure of the hydraulic fluid to the support rod 21 is cut off by the cutting assembly 4 when the distance of the support rod 21 moving outward is greater than or equal to the preset distance, so that the support rod 21 no longer supports the corresponding Larsen steel sheet pile 11, thereby avoiding damage to the Larsen steel sheet pile 11.

[0061] In a further embodiment, the cutting assembly 4 is provided with two cutting pieces 41, which are inserted into the hydraulic cylinder body 3 and located on both sides of the liquid flow channel in the hydraulic cylinder body 3. The cutting piece 41 can elastically slide in a direction perpendicular to the liquid flow channel, and has a corresponding first position and second position before and after sliding. When in the first position, the two cutting pieces 41 simultaneously stop on both sides of the support rod 21. When in the second position, the two cutting pieces 41 are sealed and abutted.

[0062] Specific to the present embodiment, in order to facilitate the installation of the cutting piece 41, as shown in Figure 7 two connecting channels 301 are symmetrically provided in the block-shaped part of the hydraulic cylinder body 3. The connecting channel 301 is provided in a C-shaped structure from the perspective, and the opening faces the support rod 21. The two ends of the connecting channel 301 are vertically communicated with the columnar sink. The cutting piece 41 is respectively inserted and slidably installed in the outer end of the connecting channel 301, and can slide in a direction perpendicular to the axis of the columnar sink.

[0063] In order to facilitate the elastic sliding of the cutting piece 41, the cutting assembly 4 is further provided with two compression springs 42, as shown in Figure 7 The compression spring 42 is horizontally inserted into the outer end of the connecting channel 301 and connected between the cutting piece 41 and the block-shaped part of the hydraulic cylinder body 3. Under the action of the compression spring 42, the cutting piece 41 has a tendency to insert into the columnar sink.

[0064] It can be understood that when the number of support rods 21 is twenty, the number of cutting assemblies 4 is also correspondingly set to twenty.

[0065] Initially, the cutting piece 41 is in the first position and pushes on the circumferential side wall of the first columnar part of the support rod 21.

[0066] During the process of the first hydraulic pump pumping hydraulic oil into the hydraulic cylinder body 3, the support rod 21 slides in the direction perpendicular to the wall surface of the supporting wall 1 and toward the supporting wall 1 under the action of hydraulic pressure; when the soil outside the Larsen steel sheet pile 11 pushed by the support rod 21 does not belong to the above-mentioned situation where the additional supporting force brought by the support rod 21 is not required, the support rod 21 is normally pushed on the inner convex surface of the Larsen steel sheet pile 11 with the convex end facing inward or the inner concave surface of the Larsen steel sheet pile 11 with the convex end facing outward, so as to support the foundation pit through the supporting wall 1.

[0067] When the soil outside the Larsen steel sheet pile 11 pushed by the support rod 21 belongs to the above-mentioned situation where the additional supporting force brought by the support rod 21 is not required, when the support rod 21 moves outward a preset distance under the action of hydraulic pressure, the end of the first columnar part of the support rod 21 passes over the truncation piece 41. At this time, under the action of the compression spring 42, the two truncation pieces 41 in the hydraulic cylinder body 3 can be inserted into the columnar sink groove and achieve sealed abutment. At this time, the hydraulic oil in the hydraulic cylinder body 3 is divided into two streams, one of which is in contact with the support rod 21, and the hydraulic pressure is zero, so that the support rod 21 no longer supports the corresponding Larsen steel sheet pile 11, avoiding damage to the Larsen steel sheet pile 11; the other stream does not contact the support rod 21, and the hydraulic pressure is normal.

[0068] In a further embodiment, in order to improve the sealing performance when the two truncation pieces 41 abut against each other, the abutting surfaces of the two truncation pieces 41 are configured to be keyed.

[0069] Specifically in this embodiment, the abutting surface of the truncation piece 41 can be set to any shape that can be spliced ​​together, such as S-shape, L-shape, C-shape, zigzag shape, wave shape, etc.

[0070] In other embodiments, in order to improve the convenience during adjustment, all the hydraulic cylinder bodies 3 in the same group are arranged to be interconnected.

[0071] Specifically in this embodiment, Figure 5 As shown, a connecting pipe 22 is inserted into the pressure-bearing seat 2, and the connecting pipe 22 is connected to the inner ends of all the columnar sinks at the same time.

[0072] It can be understood that, in order to facilitate the supply of hydraulic fluid to the hydraulic cylinder 3 , the support mechanism for foundation pit excavation can be configured to include a second hydraulic pump, and the pumping end of the second hydraulic pump is connected to the connecting pipe 22 .

[0073] It can be understood that in order to make the supporting force F1 generated by the support rod 21 supported on the Larsen steel sheet pile 11 with the convex end facing inward smaller than the supporting force F2 generated by the support rod 21 supported on the Larsen steel sheet pile 11 with the convex end facing outward, it can be set that the radius of the first columnar part of the support rod 21 supported on the Larsen steel sheet pile 11 with the convex end facing inward is smaller than the radius of the first columnar part of the support rod 21 supported on the Larsen steel sheet pile 11 with the convex end facing outward.

[0074] Specifically, since all the hydraulic cylinder bodies 3 in the same group are interconnected, the pressure of the hydraulic oil filled in all the hydraulic cylinder bodies 3 is equal. Since the radius of the first columnar part of the support rod 21 supported on the Larsen steel sheet pile 11 with the convex end facing inward is smaller than the radius of the first columnar part of the support rod 21 supported on the Larsen steel sheet pile 11 with the convex end facing outward, the inner end area of ​​the first columnar part of the support rod 21 supported on the Larsen steel sheet pile 11 with the convex end facing inward is smaller than the inner end area of ​​the first columnar part of the support rod 21 supported on the Larsen steel sheet pile 11 with the convex end facing outward (S=πr). Since the supporting force generated by the support rod 21 is equal to the pressure of the hydraulic oil multiplied by the inner end area of ​​the first columnar part of the support rod 21 (F=PS), the supporting force F1 generated by the support rod 21 supported on the Larsen steel sheet pile 11 with the convex end facing inward is smaller than the supporting force F2 generated by the support rod 21 supported on the Larsen steel sheet pile 11 with the convex end facing outward.

[0075] In other embodiments, the support mechanism for foundation pit excavation is configured to also include a hydraulic drive component, which is configured to provide a driving force for the two pressure seats 2 to move synchronously in directions away from or towards each other, so as to adapt to two rows of support walls 1 with different spacings.

[0076] Specifically in this embodiment, the hydraulic driving component can be set as a manual hydraulic bidirectional driving cylinder or an electric bidirectional hydraulic driving cylinder 5.

[0077] More specifically, Figure 1 As shown, the electric bidirectional hydraulic drive cylinder 5 and the two pressure-bearing seats 2 together form an "I"-shaped structure.

[0078] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The above-described embodiments merely illustrate several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that variations and modifications are possible without departing from the scope of the present invention, and such variations and modifications are fully within the scope of protection of the present invention.

Claims

1. A support mechanism for foundation pit excavation, characterized in that: The support mechanism for foundation pit excavation includes a support wall, which has two rows of support walls. Each row of support walls includes multiple Larsen steel sheet piles. The relatively convex portion of the inner side of the support wall serves as a first pressure portion, and the relatively concave portion of the inner side of the support wall serves as a second pressure portion. The inner sides of the two rows of support walls are each provided with a pressure seat. Each pressure seat is provided with multiple support rods. The support rods can slide in a direction perpendicular to the wall surface of the support wall to support the first pressure portion or the second pressure portion. The support force generated by the support rods supporting the first pressure portion is F1, and the support force generated by the support rods supporting the second pressure portion is F2, where F1 is less than F2. It also includes a hydraulic drive assembly for providing a driving force for the support rod to slide. The hydraulic drive assembly includes a plurality of hydraulic cylinders, which are inserted into the pressure-bearing seat and configured to receive hydraulic fluid from the outside. The support rod is inserted into the hydraulic cylinder body; The hydraulic cylinder of the hydraulic cylinder is equipped with a plurality of hydraulic cylinders, and the hydraulic cylinder of the hydraulic cylinder is equipped with a plurality of hydraulic cylinders. ..., and the hydraulic cylinder of the hydraulic cylinder is equipped with a plurality of hydraulic cylinders, and the hydraulic cylinder of the hydraulic cylinder is equipped with a plurality of hydraulic cylinders, and the hydraulic cylinder of the hydraulic cylinder is equipped with a plurality of hydraulic cylinders, and the hydraulic cylinder of the hydraulic cylinder is equipped with a plurality of hydraulic cylinders, and the hydraulic cylinder of the hydraulic cylinder is equipped with a plurality of hydraulic cylinders, and the hydraulic cylinder of the hydraulic cylinder is equipped with a plurality of hydraulic cylinders, and the hydraulic cylinder of the hydraulic cylinder is equipped with a plurality of hydraulic cylinders, and the hydraulic cylinder of the hydraulic cylinder is equipped with a plurality of hydraulic cylinders, and the hydraulic cylinder of the hydraulic cylinder is equipped with a plurality of hydraulic cylinders, and the hydraulic cylinder of the hydraulic cylinder is equipped with a plurality of hydraulic cylinders, and the hydraulic cylinder of the hydraulic cylinder is equipped with a plurality of hydraulic cylinder 2. The supporting mechanism for foundation pit excavation according to claim 1, characterized in that: The abutting surfaces of the two truncated pieces are keyed together.

3. The supporting mechanism for foundation pit excavation according to claim 1, characterized in that: The support mechanism for foundation pit excavation also includes a hydraulic drive component, which is configured to provide a driving force for the two pressure-bearing seats to move synchronously in directions away from or towards each other, so as to adapt to two rows of support walls with different spacings.

4. The supporting mechanism for foundation pit excavation according to claim 3, characterized in that: The hydraulic drive component is a manual hydraulic bidirectional drive cylinder or an electric bidirectional hydraulic drive cylinder.

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