Construction method for optimizing assembly and disassembly of support in rectangular foundation pit based on construction simulation analysis

Abstract

The invention discloses a construction method for optimizing assembly and disassembly of an inner support of a rectangular foundation pit based on construction simulation analysis, which comprises the following steps: S1, the rectangular foundation pit adopts a secant pile and two concrete to form a fender post and carries out peripheral support, and four corners of the rectangular foundation pit adopt angle braces to carry out inner support; s2, the rectangular foundation pit is divided into four construction areas according to the cross arrangement position of a floor structure post-cast strip in the rectangular foundation pit; s3, layer-by-layer pouring construction is conducted on the floor structure in the rectangular foundation pit from bottom to top, and the pouring construction of each layer is conducted through four construction areas in a partitioned flow construction mode; according to the scheme, pouring construction simulation and stress calculation are conducted on the construction area through modeling, reinforcing measures needed to be adopted for regional flow construction are obtained, regional dismantling of angle braces is achieved through structural reinforcing, temporary support arrangement and other means, and therefore regional flow construction of the floor structure in the rectangular foundation pit is achieved, and the construction efficiency is improved. And the cooperative capability of workers and mechanical equipment operation is enhanced, the construction progress is accelerated, and the construction cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of support construction in a foundation pit, and in particular to a construction method for optimizing the assembly and disassembly of supports in a rectangular foundation pit based on construction simulation analysis. Background Art

[0002] During the construction of rectangular foundation pits, the foundation pit support generally uses interlocking piles plus two layers of concrete for external support, and the rectangular foundation pit uses angle braces for internal support. During the internal support removal stage, the supporting soil pressure is transferred to the floor structure through the replacement support beam. The general design requirement is that the upper internal support beam can only be removed after the corresponding casting floors in the foundation pit and the corresponding replacement support structure of the support are all completed. As a result, it is impossible to organize zoned flow construction on site, and there are situations where workers and mechanical equipment are idle. This is contrary to the demolition sequence required for actual construction, resulting in a longer construction period and an indirect increase in construction management costs.

[0003] Therefore, the current order of dismantling internal supports tends to be conservative for safety reasons, and the original structure does not support the construction sequence required for actual construction. However, with the increasing competitive pressure in the construction industry and higher construction period requirements, a construction sequence that does not match the actual construction will waste a lot of time. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a construction method for optimizing the installation and disassembly of supports in a rectangular foundation pit based on construction simulation analysis, establishes a support dismantling model in the foundation pit to perform construction process simulation and force analysis calculation, and realizes support dismantling in different areas by means of strengthening the structure and setting temporary supports, thereby realizing flow construction in other areas, thereby solving the problems of long construction period and high construction cost of the current support dismantling construction method.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is:

[0006] A construction method for optimizing the installation and disassembly of supports in a rectangular foundation pit based on construction simulation analysis is provided, which comprises the following steps:

[0007] S1: The rectangular foundation pit uses interlocking piles and two concrete layers to form retaining piles and provide peripheral support. The four corners of the rectangular foundation pit use corner braces for internal support.

[0008] S2: According to the cross arrangement position of the post-cast strips of the floor structure in the rectangular foundation pit, the rectangular foundation pit is divided into four construction areas;

[0009] S3: The floor structure in the rectangular foundation pit is poured layer by layer from bottom to top. The pouring construction of each layer is carried out in four construction areas in a zoned and continuous manner, which includes:

[0010] S31: Before pouring construction in each construction area, the pouring construction simulation and force calculation of the construction area are carried out through modeling, and the structure of each area that does not meet the force calculation requirements is strengthened until the entire construction area meets the force calculation requirements;

[0011] S32: Cast the floor structure and the replacement support beam in the construction area, and when the strength of the floor structure and the replacement support beam reaches the design requirements, remove the corresponding angle braces in the construction area;

[0012] S33: Repeat steps S31-S32 until the construction of all floor structures in the rectangular foundation pit and the removal of all corner braces are completed;

[0013] S4: On-site acceptance based on VR technology.

[0014] Furthermore, step S31 specifically includes:

[0015] S311: Establish a basement model based on the support drawings of the rectangular foundation pit and the floor structure design drawings;

[0016] S312: Based on the reaction force of the retaining piles provided by the foundation pit support design, combined with the support removal in the planned construction area, the force calculation is performed, and the area where the structural deflection and the deformation of the retaining piles exceed the design requirements is regarded as the area where the force calculation does not meet the requirements;

[0017] S313: Strengthen the structure of each area where the force calculation is not satisfied;

[0018] S314: Recalculate the force on the basement model after structural reinforcement; if there are still areas where the force calculation does not meet the requirements, return to step S313 until the entire construction area meets the force calculation requirements.

[0019] Furthermore, the support drawings of the rectangular foundation pit in step S311 include the plane layout, concrete strength and reinforcement information of each replacement support beam and support beam, and the design drawings of the floor structure include the plane layout, concrete strength and reinforcement information of the walls, columns, beams and slabs of each floor.

[0020] Furthermore, the structural reinforcement methods in step S313 include: increasing the floor slab thickness and the number of reinforcements; setting temporary supports at post-cast strips, large openings, and ramps; and increasing the spacing between temporary supports.

[0021] Furthermore, the angle support in step S1 includes a number of main support members that are horizontally spaced and parallel to each other, the two ends of the main support members are respectively connected to the retaining piles on two adjacent sides of the rectangular foundation pit, and a number of auxiliary support members perpendicular to the main support members are arranged between adjacent main support members and between the main support members and the corners of the rectangular foundation pit.

[0022] Furthermore, the method for dismantling the angle brace in step S32 is: first dismantle the auxiliary support components, and then dismantle the main support components, and the main support components are dismantled in sections from the outside to the inside by removing one and leaving one, and a certain time is left as a stress release observation period, and the floor structure, replacement support beams and guardrail piles are observed for any abnormalities. If there are any abnormalities, the abnormal area is structurally reinforced again; if there are no abnormalities, continue to dismantle the remaining main support components, and leave a certain time as a stress release observation period, and observe the floor structure, replacement support beams and guardrail piles for any abnormalities again; if there are any abnormalities, the abnormal area is structurally reinforced again; if there are no abnormalities, the removal of the angle brace in the construction area is completed.

[0023] Furthermore, the order of the zoned flow construction in the four construction areas in step S3 is:

[0024] S301: firstly select a construction area and perform pouring construction on the floor structure therein, and while removing the corresponding angle brace of the construction area, sequentially perform pouring construction on the floor structures of two construction areas adjacent to the construction area, and finally perform pouring construction on the floor structure of the remaining construction area;

[0025] S302: While removing the corresponding angle brace of each construction area, pouring construction is carried out on the floor structure of the next construction area; while removing the corresponding angle brace of the last construction area of ​​the same layer, pouring construction of the floor structure of the previous layer is continued for a construction area that is not adjacent to the construction area, and so on, until the construction of all floor structures in the rectangular foundation pit and the removal of all angle braces are completed.

[0026] Furthermore, a plurality of force transmission rods are arranged between the plates of the floor structures of two adjacent construction areas. The beneficial effects of the present invention are as follows:

[0027] 1. This scheme simulates the pouring construction and calculates the force in the construction area through modeling, obtains the reinforcement measures that need to be taken to meet the needs of regional flow construction, and realizes the regional removal of corner braces through structural reinforcement and setting up temporary supports, thereby realizing the regional flow construction of the floor structure in the rectangular foundation pit, thereby enhancing the coordination and cooperation ability of workers and mechanical equipment, avoiding the situation where workers and mechanical equipment are idle, thereby speeding up the construction progress and reducing the cost of construction management and manpower and material working time.

[0028] 2. This scheme has carried out pouring construction simulation, force calculation and structural reinforcement in advance. Therefore, when the angle brace is dismantled in different areas, the floor structure, replacement support beams, retaining piles and other structures are not prone to abnormal deformation, thereby improving the safety of dismantling the brace. At the same time, the skip-section method is used to dismantle the main support members in the angle brace in batches, which further enhances the safety of dismantling the brace and ensures the stability and reliability of the floor structure, replacement support beams and retaining piles. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a flow chart of the construction method of this scheme.

[0030] Figure 2 Flowchart for construction simulation, force calculation and structural reinforcement based on modeling.

[0031] Figure 3 Cross-sectional view showing the second support being removed.

[0032] Figure 4 This is a cross-sectional view of the first support being removed.

[0033] Figure 5 This is the zoning map of the rectangular foundation pit construction area.

[0034] Figure 6 This is the top view of the dismantling of the second support in Zone II.

[0035] Figure 7 This is the top view of the dismantling of the second support in Zone I.

[0036] Figure 8 This is the top view of the dismantling of the second support in Zone IV.

[0037] Fig. 9 This is the top view of the dismantling of the second support in Zone III. DETAILED DESCRIPTION

[0038] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0039] like Figure 1 and Figure 2 As shown, the construction method of optimizing the installation and disassembly of supports in a rectangular foundation pit based on construction simulation analysis of this scheme includes the following steps:

[0040] S1: The rectangular foundation pit uses interlocking piles plus two concrete lines to form retaining piles and provide peripheral support. The four corners of the rectangular foundation pit use angle braces for internal support; the angle braces include a number of main supports that are horizontally spaced and parallel to each other, the two ends of the main supports are respectively connected to the retaining piles on the two adjacent sides of the rectangular foundation pit, and a number of auxiliary supports perpendicular to the main supports are arranged between adjacent main supports and between the main supports and the corners of the rectangular foundation pit;

[0041] S2: According to the cross arrangement position of the post-cast strips of the floor structure in the rectangular foundation pit, the rectangular foundation pit is divided into four construction areas;

[0042] S3: The floor structure in the rectangular foundation pit is poured layer by layer from bottom to top. The pouring construction of each layer is carried out in four construction areas in a zoned and continuous manner, which includes:

[0043] S31: Before pouring construction in each construction area, the pouring construction simulation and force calculation of the construction area are carried out through modeling, and the structure of each area that does not meet the force calculation requirements is strengthened until the entire construction area meets the force calculation requirements; specifically, it includes:

[0044] S311: Establish a basement model according to the support drawings of the rectangular foundation pit and the design drawings of the floor structure; the support drawings of the rectangular foundation pit include the plane layout, concrete strength and reinforcement information of each replacement beam and support beam, and the design drawings of the floor structure include the plane layout, concrete strength and reinforcement information of the walls, columns, beams and slabs of each floor;

[0045] S312: Based on the reaction force of the retaining piles provided by the foundation pit support design, combined with the support removal in the planned construction area, the force calculation is performed, and the area where the structural deflection and the deformation of the retaining piles exceed the design requirements is regarded as the area where the force calculation does not meet the requirements;

[0046] S313: Strengthen the structure of each area where the force calculation is not satisfied; the structural strengthening methods include: increasing the thickness of the floor slab and the number of reinforcements; setting up temporary supports at post-cast strips, large openings, and ramps; and increasing the spacing of temporary supports;

[0047] S314: Recalculate the force on the basement model after structural reinforcement; if there are still areas where the force calculation does not meet the requirements, return to step S313 until the entire construction area meets the force calculation requirements.

[0048] S32: Casting construction is carried out on the floor structure and replacement support beams in the construction area, and when the strength of the floor structure and replacement support beams reaches the design requirements, the corresponding angle braces in the construction area are removed; the method for removing the angle braces is: first remove the auxiliary support parts, then remove the main support parts, and the main support parts are removed in sections from the outside to the inside by removing one and leaving one, and a certain time is left as a stress release observation period, and the floor structure, replacement support beams and retaining piles are observed for any abnormalities. If there are any abnormalities, the abnormal area is reinforced again; if there are no abnormalities, the remaining main support parts are continued to be removed, and a certain time is left as a stress release observation period, and the floor structure, replacement support beams and retaining piles are observed for any abnormalities again; if there are any abnormalities, the abnormal area is reinforced again; if there are no abnormalities, the removal of the angle braces in the construction area is completed.

[0049] S33: Repeat steps S31-S32 until the construction of all floor structures in the rectangular foundation pit and the removal of all corner braces are completed.

[0050] The order of the flow construction in the four construction areas in step S3 of this scheme is:

[0051] S301: firstly select a construction area and perform pouring construction on the floor structure therein, and while removing the corresponding angle brace of the construction area, sequentially perform pouring construction on the floor structures of two construction areas adjacent to the construction area, and finally perform pouring construction on the floor structure of the remaining construction area;

[0052] S302: while removing the corresponding angle brace of each construction area, pouring construction is performed on the floor structure of the next construction area; while removing the corresponding angle brace of the last construction area of ​​the same floor, pouring construction of the floor structure of the previous floor is continued for a construction area not adjacent to the construction area, and a number of force transmission rods are arranged between the plates of the floor structures of two adjacent construction areas; and so on, until the construction of all floor structures in the rectangular foundation pit and the removal of all angle braces are completed;

[0053] S4: On-site acceptance based on VR technology.

[0054] When this plan is implemented, Figure 3 As shown in the figure, this scheme has two angle braces in the numerical direction, namely the first brace and the second brace from top to bottom. When removing the second brace, the bottom plate, the negative third floor top plate and the replacement brace beam are constructed first; when the curing strength of the last piece of poured concrete under the projection surface of the removal brace and the replacement brace beam reaches 75% of the design strength, the second brace can be removed; Figure 4 As shown, when the first support is removed, the negative second floor top plate and the replacement support beam are constructed first; when the curing strength of the last piece of poured concrete under the projection surface of the removed support and the replacement support beam reaches 75% of the design strength, the first support can be removed.

[0055] like Figures 5 to 9 As shown, this scheme divides the rectangular foundation pit into four construction areas, namely, I, II, III, and IV. After the bottom plate is completely poured, the negative second-floor structure of area II is poured first. After reaching the design strength, the second support corresponding to area II is removed. When dismantling, the auxiliary supports are removed first, and then the main supports. 1, 2, 3, and 4 in the figure are all main supports. Main supports 1 and 2 are removed first. After a day of stress release observation period and monitoring without abnormalities, main supports 3 and 4 are removed. After another day of stress release observation period and monitoring without abnormalities, the dismantling is completed. In particular, when monitoring shows abnormalities, the dismantling should be stopped immediately, and the structure should be strengthened and the force calculation should be carried out again in the abnormal area until the requirements are met, and then the dismantling of the main supports can be continued.

[0056] While dismantling the second support corresponding to Zone II, pouring construction is carried out on the negative second floor structure of Zone I. After reaching the design strength, the second support corresponding to Zone I is dismantled; while dismantling the second support corresponding to Zone I, pouring construction is carried out on the negative second floor structure of Zone IV. After reaching the design strength, the second support corresponding to Zone IV is dismantled; while dismantling the second support corresponding to Zone IV, pouring construction is carried out on the negative second floor structure of Zone III. After reaching the design strength, the second support corresponding to Zone III is dismantled; while dismantling the second support corresponding to Zone III, pouring construction is carried out on the negative first floor structure of Zone II. After reaching the design strength, the first support corresponding to Zone II is dismantled; and so on, until the construction of all floor structures in the rectangular foundation pit and the dismantling of all angle supports are completed.

[0057] In summary, this scheme simulates the pouring construction and calculates the force in the construction area through modeling, obtains the reinforcement measures that need to be taken to meet the regional flow construction, and realizes the regional removal of the angle brace through structural reinforcement and the setting of temporary support, thereby realizing the regional flow construction of the floor structure in the rectangular foundation pit, thereby enhancing the coordination and cooperation ability of workers and mechanical equipment, speeding up the construction progress, reducing the cost of construction management and manpower and material working time, and at the same time ensuring the stability and reliability of the floor structure and the safety of the support removal process.

Claims

1. A construction method for optimizing support assembly and disassembly in a rectangular foundation pit based on construction simulation analysis, characterized in that: The following steps are involved: S1: The rectangular foundation pit uses interlocking piles and two concrete layers to form retaining piles and provide peripheral support. The four corners of the rectangular foundation pit use corner braces for internal support. S2: According to the cross arrangement position of the post-cast strips of the floor structure in the rectangular foundation pit, the rectangular foundation pit is divided into four construction areas; S3: The floor structure in the rectangular foundation pit is poured layer by layer from bottom to top. The pouring construction of each layer is carried out in four construction areas in a zoned and continuous manner, which includes: S31: Before pouring construction in each construction area, the pouring construction simulation and force calculation of the construction area are carried out through modeling, and the structure of each area that does not meet the force calculation requirements is strengthened until the entire construction area meets the force calculation requirements; S32: Cast the floor structure and the replacement support beam in the construction area, and when the strength of the floor structure and the replacement support beam reaches the design requirements, remove the corresponding angle braces in the construction area; S33: Repeat steps S31-S32 until the construction of all floor structures in the rectangular foundation pit and the removal of all corner braces are completed; S4: On-site acceptance based on VR technology.

2. The construction method for optimizing the installation and disassembly of supports in rectangular foundation pits based on construction simulation analysis according to claim 1 is characterized in that: Step S31 specifically includes: S311: Establish a basement model based on the support drawings of the rectangular foundation pit and the floor structure design drawings; S312: Based on the reaction force of the retaining piles provided by the foundation pit support design, combined with the support removal in the planned construction area, the force calculation is performed, and the area where the structural deflection and the deformation of the retaining piles exceed the design requirements is regarded as the area where the force calculation does not meet the requirements; S313: Strengthen the structure of each area where the force calculation is not satisfied; S314: Recalculate the force on the basement model after structural reinforcement; if there are still areas where the force calculation does not meet the requirements, return to step S313 until the entire construction area meets the force calculation requirements.

3. The construction method for optimizing the installation and disassembly of supports in rectangular foundation pits based on construction simulation analysis according to claim 2 is characterized in that: The support drawings of the rectangular foundation pit in step S311 include the plane layout, concrete strength and reinforcement information of each replacement support beam and support beam, and the design drawings of the floor structure include the plane layout, concrete strength and reinforcement information of the walls, columns, beams and slabs of each floor.

4. The construction method for optimizing the installation and disassembly of supports in rectangular foundation pits based on construction simulation analysis according to claim 2 is characterized in that: The structural reinforcement methods in step S313 include: increasing the floor slab thickness and the number of reinforcements; setting temporary supports at post-cast strips, large openings, and ramps; and increasing the spacing between temporary supports.

5. The construction method for optimizing the installation and disassembly of supports in rectangular foundation pits based on construction simulation analysis according to claim 1 is characterized in that: The angle brace in step S1 includes a number of main braces that are horizontally spaced and parallel to each other, the two ends of the main braces are respectively connected to the retaining piles on two adjacent sides of the rectangular foundation pit, and a number of auxiliary braces perpendicular to the main braces are arranged between adjacent main braces and between the main braces and the corners of the rectangular foundation pit.

6. The construction method for optimizing the installation and disassembly of supports in rectangular foundation pits based on construction simulation analysis according to claim 5 is characterized in that: The method for removing the angle brace in step S32 is: first remove the auxiliary support, then remove the main support, and remove the main support from the outside to the inside in a skipped manner, and leave a certain time as a stress release observation period to observe whether there are any abnormalities in the floor structure, replacement support beams and retaining piles. If there are any abnormalities, the abnormal area is reinforced again; If there are no abnormalities, continue to dismantle the remaining main supports, and leave a certain amount of time as a stress release observation period, and observe again whether there are any abnormalities in the floor structure, replacement support beams and retaining piles; if there are abnormalities, the structure of the abnormal area will be strengthened again; if there are no abnormalities, the removal of the angle supports in the construction area will be completed.

7. The construction method for optimizing the installation and disassembly of supports in rectangular foundation pits based on construction simulation analysis according to claim 1, characterized in that: The order of the zoned flow construction in the four construction areas in step S3 is: S301: firstly select a construction area and perform pouring construction on the floor structure therein, and while removing the corresponding angle brace of the construction area, sequentially perform pouring construction on the floor structures of two construction areas adjacent to the construction area, and finally perform pouring construction on the floor structure of the remaining construction area; S302: While removing the corresponding angle brace of each construction area, pouring construction is carried out on the floor structure of the next construction area; while removing the corresponding angle brace of the last construction area of ​​the same layer, pouring construction of the floor structure of the previous layer is continued for a construction area that is not adjacent to the construction area, and so on, until the construction of all floor structures in the rectangular foundation pit and the removal of all angle braces are completed.

8. The construction method for optimizing the installation and disassembly of supports in rectangular foundation pits based on construction simulation analysis according to claim 1 is characterized in that: A number of force transmission rods are arranged between the plates of the floor structures of two adjacent construction areas.

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