Foundation pit steel pipe support sliding type construction system and construction method

Abstract

According to the foundation pit steel pipe support sliding type construction system and method, a first-layer concrete support and a top beam are connected and matched to form an enclosed foundation pit excavation area, the two ends of a bearing beam are connected with the first-layer concrete support and the top beam correspondingly and bear a lifting device, and the bearing beam is distributed below the top beam and bears a lower-layer steel pipe support assembly; the lifting device is connected with the joist through a steel strand and can drive the joist to move, the lower-layer steel pipe support assembly comprises a plurality of sets of steel pipe supports distributed in a staggered mode, and the limiting pieces are arranged on the two sides of each steel pipe support; the lifting device drives the joist and the lower-layer steel pipe support assembly to move, so that multiple layers of steel pipe supports can be synchronously arranged at a time before excavation, synchronously descend and slide down in an enclosed narrow foundation pit excavation area and are installed in batches, the steel pipe supports are convenient to lift and install, and the construction efficiency is improved. Therefore, difficulty and potential risks caused by the narrow space to multi-layer steel pipe support construction are reduced, and the overall construction efficiency is improved under the condition that the construction precision is met.

Description

Technical Field

[0001] The present invention relates to the technical field of civil engineering, and in particular to a construction technology for foundation pit steel pipe supports. Background Art

[0002] During the foundation pit excavation process, it is necessary to adopt a combination of foundation pit retaining structure and support system to carry out underground space construction. Steel pipe support is a support method that is convenient to construct, reusable, has good deformation control, and is green and low-carbon. It is widely used in foundation pit excavation support.

[0003] In existing technology, steel pipe supports are usually constructed by combining the first-layer steel pipe supports with the lower-layer servo steel pipe supports or prestressed steel pipe supports. The steel pipe support components are connected by bolts. Only after the installation of one layer of steel pipe supports is completed can the foundation pit excavation of the next layer be carried out. However, in the narrow construction space, after the construction of the upper layer of steel pipe supports is completed, the components of the steel pipe support system will cause a sharp increase in the lifting workload of the lower layer of steel pipe supports. At the same time, the clearance distance between the completed upper layer of steel pipe supports and the excavation surface is insufficient, which not only affects the accuracy of the steel pipe support assembly, but also greatly restricts the speed of workers' component splicing and installation operations, thereby reducing the overall construction efficiency of the steel pipe supports and failing to fully utilize the efficient construction characteristics of the steel pipe support system.

[0004] Therefore, how to effectively improve the construction efficiency and installation accuracy of steel pipe supports in narrow spaces has become an urgent problem to be solved in this field. Summary of the Invention

[0005] In view of the defects of the prior art, the purpose of the present invention is to provide a foundation pit steel pipe support sliding construction system and construction method with high construction efficiency and installation accuracy in a narrow space.

[0006] In order to achieve the above-mentioned purpose, the present invention provides a sliding construction system for foundation pit steel pipe supports, including a lifting device, a first-layer concrete support and a crown beam. The first-layer concrete support and the crown beam are connected and cooperated to form an enclosed foundation pit excavation area. It also includes a supporting beam, a joist, a lower-layer steel pipe support assembly and a limiting piece. The two ends of the supporting beam are respectively connected to the first-layer concrete support and the crown beam, and carry the lifting device. The joist is distributed below the crown beam and carries the lower-layer steel pipe support assembly. The lifting device is connected to the joist through a steel strand, which can drive the joist to move. The lower-layer steel pipe support assembly includes several groups of staggered steel pipe supports, and the limiting pieces are arranged on both sides of each steel pipe support.

[0007] Furthermore, the supporting beam and the lifting device are respectively arranged at the four corners of the foundation pit excavation area, and the first group of steel pipe supports in the lower steel pipe support assembly is distributed corresponding to the designed installation position of the steel pipe supports.

[0008] In order to achieve the above-mentioned object, the present invention provides a foundation pit steel pipe support sliding construction method, based on the foundation pit steel pipe support sliding construction system, the construction method comprises:

[0009] The first-floor concrete support and the crown beam connection form an enclosed foundation pit excavation area. Preliminary excavation work is carried out in the foundation pit excavation area to form a system placement space and install the components of the construction system.

[0010] The first layer of excavation work is carried out in the foundation pit excavation area. The lifting device lowers the joist through the steel strands, lowers the lower steel pipe support assembly to the design elevation of the first layer of steel pipe support, and installs support devices at both ends of the first group of steel pipe supports to form the first layer of foundation pit support structure.

[0011] The second layer of excavation is carried out in the foundation pit excavation area. The lifting device lowers the joist through the steel strands, lowers the lower steel pipe support assembly to the designed elevation of the second layer of steel pipe supports, moves the first limiter on one side of the second set of steel pipe supports to the designed installation position of the steel pipe supports, and adjusts the inclination angle of the joist so that the second set of steel pipe supports rolls to the designed installation position of the steel pipe supports under the action of gravity. The second limiter on the other side of the second set of steel pipe supports is moved to cooperate with the second set of steel pipe supports, and support devices are installed at both ends of the second set of steel pipe supports to form the second layer of foundation pit support structure.

[0012] The Nth layer of excavation work is carried out in the foundation pit excavation area to form the Nth layer of foundation pit support structure.

[0013] Furthermore, when installing the components of the construction system, the two ends of the supporting beam are respectively connected to the first-floor concrete support and the crown beam, and the lifting device is carried. The supporting beam is arranged in the system installation space, the supporting beam and the lifting device are connected by steel strands, and the lower-layer steel pipe support assembly is placed on the supporting beam, and limiters are set on both sides of each steel pipe support.

[0014] Furthermore, supporting beams and lifting devices are installed at the four corners of the foundation pit excavation area.

[0015] Furthermore, a first group of steel pipe supports is placed at the design installation position of the steel pipe supports corresponding to the joist.

[0016] Furthermore, the first limiting member is arranged on one side of the second group of steel pipe supports that matches the designed installation position of the steel pipe supports, and the second limiting member is arranged on the other side of the second group of steel pipe supports.

[0017] The sliding construction system and method of the foundation pit steel pipe support provided by the present invention drives the movement of the supporting beam and the lower steel pipe support assembly through the lifting device, so that the multi-layer steel pipe supports can be synchronously placed once before excavation, and synchronously lowered and slid in the narrow foundation pit excavation area, and installed in batches, which is convenient for the lifting and installation of the steel pipe supports, thereby reducing the difficulty and potential risks of the narrow space in the construction of the multi-layer steel pipe supports, and improving the overall construction efficiency while meeting the construction accuracy conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 A schematic top view of the foundation pit steel pipe support sliding construction system provided by the present invention;

[0020] Figure 2 This is a schematic diagram of the main view of the foundation pit steel pipe support sliding construction system provided by the present invention;

[0021] Figures 3 to 7 This is a flow chart of the foundation pit steel pipe support sliding construction method provided by the present invention.

[0022] Reference numerals:

[0023] 1. Lifting device; 2. First floor concrete support; 3. Cap beam; 4. Support beam; 41. Embedded steel plate; 5. Joist; 51. First joist; 52. Second joist; 53. Stiffener;

[0024] 6. Lower steel pipe support assembly; 60. Steel pipe support; 61. First group of steel pipe support; 611. First steel pipe support; 612. Second steel pipe support; 62. Second group of steel pipe support; 621. Third steel pipe support; 622. Fourth steel pipe support;

[0025] 7. Limiting member; 71. First limiting member; 72. Second limiting member;

[0026] 8. Excavation area; 81. System installation space; 82. First-level foundation pit; 83. Second-level foundation pit; 9. Steel strands. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0028] See also Figure 1 and Figure 2 , which shows an example of the foundation pit steel pipe sliding construction system provided by the present invention.

[0029] As can be seen from the figure, the foundation pit steel pipe sliding construction system of this example mainly includes a lifting device 1, a first-layer concrete support 2, a crown beam 3, a supporting beam 4, a supporting beam 5, a lower-layer steel pipe support assembly 6 and a limiter 7.

[0030] The first-layer concrete support 2 and the crown beam 3 are connected and cooperated to form an enclosed foundation pit excavation area 8. The two ends of the supporting beam 4 are respectively connected to the first-layer concrete support 2 and the crown beam 3, and carry the lifting device 1. The supporting beam 5 is distributed below the crown beam 3 and carries the lower steel pipe support assembly 6. The lifting device 1 is connected to the supporting beam 5 through the steel strand 9, which can drive the supporting beam 5 to move. The lower steel pipe support assembly 6 includes several groups of staggered steel pipe supports, and the limiting parts 7 are arranged on both sides of each steel pipe support, so that the lifting device 1 drives the multiple layers of steel pipes to slide down synchronously through the supporting beam 5 in the enclosed narrow foundation pit excavation area 8, and install them in batches, which can effectively improve construction efficiency, reduce the impact of narrow space on construction, and improve construction accuracy.

[0031] Combine Figure 1 Among them, the first-floor concrete support 2 and the crown beam 3 are connected to each other to form an enclosed foundation pit excavation area 8, resulting in narrow lifting and installation space for the lower-layer steel pipe support assembly 6. The construction of the lower-layer steel pipe support assembly 6 will be interfered with by the first-floor concrete support 2 and the crown beam 3.

[0032] In order to improve construction efficiency and accuracy, the lifting device 1 is set above the first-floor concrete support 2 and the crown beam 3 through the supporting beam 4 to lift the supporting beam 5 and the lower-layer steel pipe support assembly 6.

[0033] Combine Figure 1 and Figure 2 Specifically, the supporting beam 4 is arranged above the first-floor concrete support 2 and the crown beam 3, and its two ends are respectively connected to the first-floor concrete support 2 and the crown beam 3, forming a diagonal bracing connection structure for the first-floor concrete support 2 and the crown beam 3, thereby improving the structural stability and bearing capacity of the supporting beam 4.

[0034] Preferably, both ends of the support beam 4 are welded to the embedded steel plates 41 preset on the first-floor concrete support 2 and the crown beam 3 to ensure that the support beam 4 has a strong bearing capacity and can bear the entire weight of the lifting device 1.

[0035] Furthermore, the lifting device 1 is preferably set on the supporting beam 4 by bolts to ensure stable cooperation between the lifting device 1 and the supporting beam 4. At the same time, after the construction is completed, the bolts can be removed and the lifting device 1 can be retracted.

[0036] Combine Figure 1 and Figure 2In coordination with it, the joist 5 is distributed below the crown beam 3, including a first joist 51 and a second joist 51. The first joist 51 and the second joist 51 are respectively distributed at the two ends of the foundation pit excavation area 8. At the same time, the first joist 51 and the second joist 51 are respectively reserved with a certain distance from the two ends of the foundation pit excavation area 8, reserving construction space for the support devices at both ends of the lower steel pipe support assembly 6.

[0037] Furthermore, the lifting device 1 is connected to the joist 5 through the steel strand 9. Preferably, a stiffening rib 53 is provided at the connection node between the joist 5 and the steel strand 9 to ensure the connection stability between the joist 5 and the steel strand 9, so that the lifting device 1 can drive the joist 5 to move by retracting and extending the steel strand 9, thereby realizing the synchronous lifting of the joist 5 and the lower steel pipe support assembly 6.

[0038] Here, the lifting device 1 is a conventional technical means in this field and can be composed of an existing lifting device, which will not be described in detail here.

[0039] In addition, the supporting beam 4 and the lifting device 1 are respectively arranged at the four corners of the foundation pit excavation area 8, so that the lifting devices 1 at the four corners can cooperate with each other to lift the supporting beam 5, ensuring that the supporting beam 5 and the lower steel pipe support assembly 6 can move smoothly. At the same time, if the supporting beam 5 is lifted only by the cooperation of two lifting devices 1 on one side, the distribution inclination angle of the supporting beam 5 can be adjusted, so that the steel pipe support 60 in the lower steel pipe support assembly 6 can roll under the action of gravity, which facilitates the installation of the steel pipe support and improves construction efficiency.

[0040] Furthermore, the lower steel pipe support assembly 6 includes several groups of staggered steel pipe supports, and the two ends of each steel pipe support 60 are respectively mounted on the first support beam 51 and the second support beam 51, so that the lifting device 1 can drive several groups of steel pipe supports to move synchronously in the foundation pit through the support beam 5.

[0041] Combine Figure 2 In order to ensure that the steel pipe support 60 can be stably placed on the first support beam 51 and the second support beam 51 and will not roll down during the lifting process, the first support beam 51 and the second support beam 51 are respectively provided with limit members 7, and the limit members 7 are symmetrically distributed on both sides of each steel pipe support 60, abutting and cooperating with the steel pipe support 60 to limit the rolling of the steel pipe support 60.

[0042] Preferably, the limiting surface of the limiting member 7 and the steel pipe support 60 is configured into an arc structure to ensure that the limiting member 7 fits the steel pipe support 60 and improves the limiting effect. In addition, the limiting member 7 is temporarily fixed to the first support beam 51 and the second support beam 51 by bolts or anti-bolts, which can not only ensure the limitation of the steel pipe support 60, but also can be quickly disassembled and assembled during construction, thereby improving construction efficiency.

[0043] As a preferred setting scheme, the lower-level steel pipe support assembly 6 includes all the steel pipe supports required for the foundation pit, and is distributed in groups and staggered, and the number of each group of steel pipe supports matches the designed installation number of steel pipe supports for each layer of the foundation pit, so that each group of steel pipe supports corresponds to each layer of the foundation pit, and multiple groups of steel pipe supports can be hoisted synchronously in the foundation pit and installed in batches in an orderly manner.

[0044] Combine Figure 2 As an example, in this example, two layers of foundation pits are designed, and the number of steel pipe supports designed to be installed in each layer of foundation pit is two. Therefore, the first group of steel pipe supports 61 includes the first steel pipe support 611 and the second steel pipe support 612, and the second group of steel pipe supports 62 includes the third steel pipe support 621 and the fourth steel pipe support 622, and the first group of steel pipe supports 61 and the second group of steel pipe supports 62 are staggered.

[0045] Specifically, the first steel pipe support 611 of the first group of steel pipe supports 61 and the third steel pipe support 621 of the second group of steel pipe supports 62 are distributed in parallel, and the second steel pipe support 612 of the first group of steel pipe supports 61 and the fourth steel pipe support 622 of the second group of steel pipe supports 62 are distributed in parallel, thereby realizing the staggered distribution of the first group of steel pipe supports 61 and the second group of steel pipe supports 62.

[0046] Furthermore, the first group of steel pipe supports 61 corresponds to the first layer of foundation pit, and the second group of steel pipe supports 62 corresponds to the second layer of foundation pit, and the first group of steel pipe supports 61 are distributed corresponding to the designed installation positions of the steel pipe supports, so that when the first group of steel pipe supports 61 is lowered to the designed elevation of the first layer of steel pipe supports, support devices 63 are set at both ends of the first group of steel pipe supports 61, so that the construction of the first layer of foundation pit support structure can be directly realized, thereby improving construction efficiency and accuracy.

[0047] At the same time, a distance is reserved between the first steel pipe support 611 and the end of the supporting beam 5, and a distance is reserved between the third steel pipe support 621 and the second steel pipe support 612, so as to provide space for the subsequent second group of steel pipe supports 62 to roll to the designed installation position of the steel pipe supports.

[0048] In this way, the first steel pipe supports 611 are distributed corresponding to the designed installation positions of the steel pipe supports, and at the same time, several groups of steel pipe supports are staggered, which can ensure the orderly installation of multiple groups of steel pipe supports in batches.

[0049] Here, there is no limit on the number of foundation pit layers and the number of steel pipe supports designed and installed for each foundation pit layer, and adaptive adjustments can be made according to specific applications.

[0050] The present invention also provides a foundation pit steel pipe support sliding construction method, based on the construction system composed of the above scheme, the construction method includes:

[0051] First, the construction system is installed.

[0052] After the construction of the enclosure structure is completed, the first-floor concrete support 2 and the crown beam 3 are connected to form an enclosed foundation pit excavation area 8. Preliminary excavation work is carried out in the foundation pit excavation area 8, and a small amount of excavation is carried out to form a system placement space 81, such as Figure 3 As shown, the components of the construction system are installed in the system installation space 81.

[0053] Combine Figure 1 and Figure 2 When installing the components of the construction system, first connect the two ends of the supporting beam 4 to the first-floor concrete support 2 and the crown beam 3 respectively, and carry the lifting device 1, and install the supporting beam 4 and the lifting device 1 at the four corners of the foundation pit excavation area 8 respectively.

[0054] Furthermore, the support beam 5 is arranged in the system placement space 81, and the first support beam 51 and the second support beam 51 are distributed relatively to the two ends of the foundation pit excavation area 8 respectively. At the same time, the first support beam 51 and the second support beam 51 are respectively reserved with a certain distance from the two ends of the foundation pit excavation area 8, reserving construction space for the support device 63 at both ends of the lower steel pipe support assembly 6.

[0055] At that time, the joist 5 and the lifting device 1 are connected by the steel strand 9, and all the steel pipe supports required for the foundation pit are placed on the joist 5 and distributed in groups and staggered. Each group of steel pipe supports corresponds to each layer of the foundation pit. Among them, the first group of steel pipe supports 61 is placed at the design installation position of the steel pipe support corresponding to the joist 5.

[0056] Next, position limiters 7 are respectively provided on both sides of each steel pipe support, and the position limiters 7 are temporarily fixed to the support beam 5 by bolts or bolt stoppers.

[0057] The lifting device 1 lifts the joist 5 through the steel strand 9, leaving space for excavation.

[0058] Furthermore, the excavation of the first-layer foundation pit 82 and the construction of the first-layer foundation pit support structure are carried out.

[0059] like Figure 4 As shown, specifically, the first layer of excavation work is carried out in the foundation pit excavation area 8 to form the first layer of foundation pit 82. The lifting device 1 lowers the support beam 5 through the steel strand 9 and lowers the lower layer steel pipe support assembly 6 to the design elevation h1 of the first layer of steel pipe support.

[0060] At this time, the first group of steel pipe supports 61 are distributed corresponding to the designed installation positions of the steel pipe supports, and support devices 63 are installed at both ends of all the steel pipe supports in the first group of steel pipe supports 61 (the first steel pipe support 611 and the second steel pipe support 612 in this example), so that the first group of steel pipe supports 61 can be directly installed in the first layer of foundation pit 82 to form the first layer of foundation pit support structure.

[0061] Here, the supporting device 63 can be composed of an existing servo device or an active head.

[0062] At that time, the limiting members 7 on both sides of the first set of steel pipe supports 61 are removed to reserve construction space for the second set of steel pipe supports 62 .

[0063] Next, the second-layer foundation pit 83 is excavated and the second-layer foundation pit support structure is constructed.

[0064] like Figure 5 As shown, specifically, the second layer of excavation work continues in the foundation pit excavation area 61 to form the second layer of foundation pit 83, and the lifting device 1 continues to lower the support beam 5 through the steel strand 9, and lowers the lower layer steel pipe support assembly 6 to the second layer steel pipe support design elevation h2.

[0065] At this time, the first group of steel pipe supports 61 reserves construction space for the second group of steel pipe supports 62, and all steel pipe supports in the second group of steel pipe supports 62 (the third steel pipe support 621 and the fourth steel pipe support 622 in this example) can be rolled to the designed installation position of the steel pipe supports in sequence.

[0066] like Figure 6 As shown, first remove the first limiter 71 on the side of the second set of steel pipe supports 62 that matches the designed installation position of the steel pipe supports, and move the first limiter 71 to the side end of the designed installation position of the steel pipe supports so that the second set of steel pipe supports 62 can roll toward the designed installation position of the steel pipe supports.

[0067] Furthermore, the two lifting devices 1 on the side away from the designed installation position of the steel pipe support are used to lift the support beam 5 so that the support beam 5 is tilted toward the designed installation position of the steel pipe support, so that the second group of steel pipe supports 62 rolls toward the designed installation position of the steel pipe support under the action of gravity, and is abutted by the first limit member 71 and moves to the designed installation position of the steel pipe support.

[0068] like Figure 7 As shown, the second limiting member 72 on the other side of the second set of steel pipe supports 62 is then removed, and the second limiting member 72 is moved to abut against the second set of steel pipe supports 62 to limit the second set of steel pipe supports 62 to ensure construction accuracy.

[0069] At that time, the two lifting devices 1 on the side away from the designed installation position of the steel pipe support cooperate to lower the joist 5 so that the joist 5 can be restored to a horizontal distribution.

[0070] Support devices 63 are installed at both ends of all the steel pipe supports in the second group of steel pipe supports 62, so that the second group of steel pipe supports 62 can be installed in the second foundation pit 83 to form a second foundation pit support structure.

[0071] Furthermore, by analogy, the Nth layer of excavation operation is continued in the foundation pit excavation area 8 to form the Nth layer of foundation pit support structure, thereby completing the construction of the foundation pit support structure.

[0072] Therefore, the foundation pit steel pipe support sliding construction system and construction method provided by the present invention drives the support beam and the lower steel pipe support assembly to move through the lifting device, so that the multi-layer steel pipe supports can be synchronously placed once before excavation, and synchronously lowered and slid in the narrow foundation pit excavation area, and installed in batches, which is convenient for the lifting and installation of the steel pipe supports, thereby reducing the difficulty and potential risks caused by the narrow space to the construction of the multi-layer steel pipe supports, and improving the overall construction efficiency while meeting the construction accuracy conditions.

[0073] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A foundation pit steel pipe support sliding construction system, comprising a lifting device, a first-layer concrete support and a crown beam, wherein the first-layer concrete support and the crown beam are connected and cooperated to form an enclosed foundation pit excavation area, characterized in that: It also includes a supporting beam, a joist, a lower steel pipe support assembly and a limiting piece. The two ends of the supporting beam are respectively connected to the first-floor concrete support and the crown beam, and carry the lifting device. The joist is distributed below the crown beam and carries the lower steel pipe support assembly. The lifting device is connected to the joist through a steel strand and can drive the joist to move. The lower steel pipe support assembly includes several groups of staggered steel pipe supports, and the limiting piece is arranged on both sides of each steel pipe support.

2. The foundation pit steel pipe support sliding construction system according to claim 1 is characterized in that: The supporting beam and the lifting device are respectively arranged at the four corners of the foundation pit excavation area, and the first group of steel pipe supports in the lower steel pipe support assembly is distributed corresponding to the designed installation position of the steel pipe supports.

3. A foundation pit steel pipe support sliding construction method, characterized in that: Based on the foundation pit steel pipe support sliding construction system according to claim 1 or 2, the construction method includes: The first-floor concrete support and the crown beam connection form an enclosed foundation pit excavation area. Preliminary excavation work is carried out in the foundation pit excavation area to form a system placement space and install the components of the construction system. The first layer of excavation work is carried out in the foundation pit excavation area. The lifting device lowers the joist through the steel strands, lowers the lower steel pipe support assembly to the design elevation of the first layer of steel pipe support, and installs support devices at both ends of the first group of steel pipe supports to form the first layer of foundation pit support structure. The second layer of excavation is carried out in the foundation pit excavation area. The lifting device lowers the joist through the steel strands, lowers the lower steel pipe support assembly to the designed elevation of the second layer of steel pipe supports, moves the first limiter on one side of the second set of steel pipe supports to the designed installation position of the steel pipe supports, and adjusts the inclination of the joist to make the second set of steel pipe supports roll to the designed installation position of the steel pipe supports under the action of gravity. The second limiter on the other side of the second set of steel pipe supports is moved to cooperate with the second set of steel pipe supports, and support devices are installed at both ends of the second set of steel pipe supports to form the second layer of foundation pit support structure. The Nth layer of excavation work is carried out in the foundation pit excavation area to form the Nth layer of foundation pit support structure.

4. The foundation pit steel pipe support sliding construction method according to claim 3, characterized in that: When installing the components of the construction system, the two ends of the supporting beam are respectively connected to the first-floor concrete support and the crown beam, and the lifting device is carried. The joist is arranged in the system installation space, and the joist and the lifting device are connected by steel strands. The lower-layer steel pipe support assembly is placed on the joist, and limiters are set on both sides of each steel pipe support.

5. The foundation pit steel pipe support sliding construction method according to claim 4, characterized in that: Support beams and lifting devices are installed at the four corners of the foundation pit excavation area.

6. The foundation pit steel pipe support sliding construction method according to claim 4, characterized in that: Place the first set of steel pipe supports at the designed installation positions of the steel pipe supports corresponding to the joists.

7. The foundation pit steel pipe support sliding construction method according to claim 3, characterized in that: The first limiting member is arranged on one side of the second group of steel pipe supports that matches the designed installation position of the steel pipe supports, and the second limiting member is arranged on the other side of the second group of steel pipe supports.

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