LU500743B1

LU500743B1 - A Construction Method of an Anti-floating System

Info

Publication number: LU500743B1
Application number: LU500743A
Authority: LU
Inventors: Qingduo Guan; Tianyu Zhang; Chao Chen; Yuqi Zhao; Yutao Zhong; Yang Zheng; Yiwen Lv; Renqiang Li; Yang Bo; Jihong Liu; Zhongqiang Yi
Original assignee: The First Construction Of China Railway No 9 Group Co Ltd
Priority date: 2021-10-18
Filing date: 2021-10-18
Publication date: 2022-04-19

Abstract

The present invention is applicable for the technical field of building anti-floating technology, which provides a construction method of an anti-floating system, and comprises the following steps: S1. build underground continuous walls, guide walls, uplift piles, dewatering wells, and high-pressure rotary jet grouting columns; S2. excavate the first foundation pit, then, build the top beams, the first concrete supports and the retaining walls after the said first foundation pit reached the first preset height, wherein, the said underground continuous walls located on the outside of the said first foundation pit serve as main reinforcements of the said retaining walls by passing through the first long main reinforcements, and the underground continuous walls located on the inside of the said first foundation pit would be served as reserved steel rebar connectors at the top of the top beams by passing through the second long main reinforcements; S3. build the second steel supports, the third steel supports, and the fourth steel supports successively; S4. construct the underlying structure, the middle-floor structure and the top-floor structure successively; S5. construct the ground-floor structure. The present invention not only improved the anti-floating effect, but also reduced the risk of leakage of water and the construction cost, and thus, it can improve the utilization rate.

Description

A Construction Method of an Anti-floating System Technical Field

[0001] The present invention relates to the technical field of building anti-floating technology, particularly to a construction method of an anti-floating system.

Background Technology

[0002] Under the background of continuous development of the national economy, and the process of urbanization is going faster and faster in China, relevant authorities have paid more and more attention to the development and utilization of urban underground space and rail transit.

[0003] Lots of cities adopted the method of constructing various underground projects based on combining urban construction. For areas with high water levels, covering little or no soil on underground structures is a common situation. In this case, the problem related to the anti-floating of underground engineering becomes more and more prominent. Thus, the anti-floating design of underground engineering is of great importance to underground construction.

[0004] Nowadays, the anti-floating measures adopted by underground projects include the methods covering soil based on increasing counterweight, setting up anti-uplift piles, and setting Up anti-floating top beams, etc. However, during the process of on-site construction, the above measures either showed poor anti-floating effect, or require high cost, which cannot meet the requirements of construction.

Summary of the Invention

[0005] The embodiment of the present invention provided a construction method of an anti-floating system, which is intended to address the problem that the existing anti-floating measures either showed poor anti-floating effect, or require high cost, and further resulting failing to satisfy the requirements of construction.

[0006] The embodiment of the present invention can be accomplished by adopting a construction method of an anti-floating system, which comprises the steps of:

[0007] S1. Build underground continuous walls, guide walls, uplift piles, dewatering wells, and high-pressure rotary jet grouting columns;

[0008] S2. Excavate the first foundation pit, then, build the top beams, the first concrete supports and the retaining walls after the said first foundation pit reached the first preset height, wherein, the said underground continuous walls located on the outside of the said first foundation pit serve as main reinforcements of the said retaining walls by passing through the first long main reinforcements, and the said underground continuous walls located on the inside of the said first foundation pit would reserve steel rebar connectors at the top of the said top beams by passing through the second long main reinforcements;

[0009] S3. Build the second steel supports, the third steel supports, and the fourth steel supports successively; 40 [0010] S4. Construct the underlying structure, the middle-floor structure and the top-floor structure successively;

[0011] S5. Construct the ground-floor structure.

1

[0012] Further, the said S3, i.e., build the second steel supports, the third steel supports, an& 4880743 fourth steel supports successively, comprises the following steps:

[0013] The specific steps of building the said second steel support comprise: excavating the second foundation pit, then, erecting the first steel supports and applying the first pre-applied axial force and the first servo system while excavating to 0.4 to 0.6 meters. After that, continue to excavate till the said second foundation pit reaches the second preset height;

[0014] The specific steps of building the said third steel support comprise: excavating the third foundation pit, then, erecting the second steel supports and applying the second pre-applied axial force and the second servo system while excavating to 0.4 to 0.6 meters. After that, continue to excavate till the said third foundation pit reaches the third preset height;

[0015] The specific steps of building the said fourth steel support comprise: excavating the fourth foundation pit, then, erecting the third steel supports and applying the third pre-applied axial force and the third servo system while excavating to 0.4 to 0.6 meters. After that, continue to excavate till the said fourth foundation pit reaches the fourth preset height.

[0016] Further, the said S4, i.e., construct the underlying structure, comprises the following steps:

[0017] Complete the construction of the bed courses of base plates, the waterproof layers of base plates, the protective layers of fine aggregate concrete, and the waterproof layers of side walls of the first part firstly;

[0018] Then, pour the base plates, the floor beams, and the concrete on the side walls of the first part;

[0019] Finally, dismantle the said third steel supports and the said fourth steel supports, then, set drainage openings, and dismantle well point pipes.

[0020] Further, the said S5, i.e., construct the ground-floor structure, comprises the following steps: close the said drainage openings and the said dewatering wells.

[0021] Further, the said $4, i.e., construct the middle-floor structure, comprises the following steps:

[0022] Complete the construction of the waterproof layers of middle plates, the center pillars, the middle plates, and the center sills as well as the concrete on the side walls of the second part firstly;

[0023] Then, dismantle the said second steel supports, the first reinforced concrete supports and the said first concrete supports.

[0024] Further, the said S1, i.e., build the guide walls, the underground continuous walls, the uplift piles, the dewatering wells, and the high-pressure rotary jet grouting columns, further comprises the following steps: build temporary columns;

[0025] Then, the specific steps of dismantling the said second steel supports, the first reinforced concrete supports and the first concrete supports further comprise: dismantling the said temporary columns.

[0026] Further, the said S4, i.e., construct the top-floor structure, comprises the following steps:

[0027] Complete the construction of the waterproof layers of top plates, the cap pillars, the top plates, and the top beams as well as the concrete on the side walls of the third part firstly;

[0028] Then, dismantle the said retaining walls and chisel out the said first long main reinforcements.

40 After that, complete the construction of both ends of the said top plates, and thus, both ends of the said top plates would extend outwards respectively to connect both sides of the said top beams.

[0029] Further, prior to the said S1, i.e., build the guide walls, the underground continuous walls, the uplift piles, the dewatering wells, and the high-pressure rotary jet grouting columns, it also comprises the following steps: prepare the site to make the said site level, then build fences.

45 [0030] Further, prior to the said S2, i.e., excavate the first foundation pit, it also comprises the following steps: complete pit dewatering 18 to 22 days in advance.

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[0031] Further, prior to the said S2, i.e., build the top beams, the first concrete supports and #380743 retaining walls, it also comprises the following steps: chisel away the top of the said underground continuous walls.

[0032] The beneficial effects achieved by the present invention comprise: participating in anti-floating through the existing building envelope, and thus, it can improve the anti-floating effect; overtopping the elevation of site leveling as there is no soil covered on the top plates of the structure; and thus, it can reduce the risk of leakage of water; reducing the cost of construction by virtue of reducing the utilization of uplift piles. Meanwhile, the present invention makes the long main reinforcements participate in the protection of the first foundation pit at the early stage based on the structure that the underground continuous walls located on the outside of the first foundation pit are passed through the first long main reinforcements, while the underground continuous walls located on the inside of the first foundation pit are passed through the second long main reinforcements, and further can serve as anchor bars to be anchored into the top plates to participate in anti-floating later, so that it can improve the utilization rate.

Brief Description of the Drawings

[0033] Figure 1 is a flow diagram of a construction method of an anti-floating system proposed by the embodiment of the present invention.

[0034] Figure 2 is a structural schematic diagram of the early-stage construction of a construction method of an anti-floating system proposed by the embodiment of the present invention.

[0035] Figure 3 is a schematic diagram of the construction structure of the first concrete supports described in the construction method of an anti-floating system proposed by the embodiment of the present invention.

[0036] Figure 4 is a schematic diagram of amplification of the structure of part A as shown in figure

3.

[0037] Figure 5 is a schematic diagram of the construction structure of the second steel supports, the third steel supports and the fourth steel supports described in the construction method of the anti-floating system proposed by the embodiment of the present invention.

[0038] Figure 6 is a schematic diagram of the construction structure of the underlying structure described in the construction method of the anti-floating system proposed by the embodiment of the present invention.

[0039] Figure 7 is a schematic diagram of the construction structure of the middle-floor structure described in the construction method of the anti-floating system proposed by the embodiment of the present invention.

[0040] Figure 8 is a structural schematic diagram prior to the construction of the top-floor structure described in the construction method of the anti-floating system proposed by the embodiment of the present invention.

[0041] Figure 9 is a schematic diagram of the construction structure of the top-floor structure described in the construction method of the anti-floating system proposed by the embodiment of the 40 present invention.

[0042] Figure 10 is a schematic diagram of the construction structure of the ground-floor structure described in the construction method of the anti-floating system proposed by the embodiment of the present invention.

[0043] Figure 11 is a schematic diagram of amplification of the structure of part B as shown in figure 45 10.

3

[0044] Wherein, 1 represents the underground continuous wall; 2 represents the guide w&l#580743 represents the uplift pile; 4 represents the dewatering well; 5 represents the high-pressure jet grouting column; 6 represents the temporary column; 7 represents the top beam; 8 represents the first concrete support; 9 represents the retaining wall; 10 represents the first long main reinforcement; 11 represents the second long main reinforcement; 12 represents the second steel support; 13 represents the third steel support; 14 represents the fourth steel support; 15 represents the underlying structure; 16 represents the middle-floor structure; 17 represents the top-floor structure; 18 represents the ground-floor structure.

Detailed Description of the Presently Preferred Embodiments

[0045] For the purpose of illustrating the objectives, the technical schemes, and the advantages of the present invention clearly and definitely, the text below will further describe the present invention in detail in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, rather than imposing restrictions on the present invention.

[0046] The embodiment of the present invention provided a construction method of an anti-floating system, as shown in figure 1, it comprises the following steps:

[0047] S101. build underground continuous walls 1, guide walls 2, uplift piles 3, dewatering wells 4, and high-pressure rotary jet grouting columns 5, as shown in figure 2.

[0048] Specifically, prior to construction, prepare the site firstly to make the said site level. During preparation, the manual or mechanical method can be utilized. Wherein, the preparation methods include leveling or filling the site, and removing water accumulation, etc. After the preparation is completed, build fences. Wherein, the scope of fences shall be determined according to actual needs. After building fences, implement the planning by scribing to determine the construction location.

[0049] Specifically, the construction specifications of the said underground continuous walls, the said guide walls 2, the said uplift piles 3, the said dewatering well 4 and the said high-pressure rotary jet grouting columns 5 shall be subject to the pre-designed drawings. Furthermore, the construction method adopts the available construction methods, which would not be further described herein.

[0050] Further, the temporary columns 6 shall be built to increase the structural strength at the early stage and facilitate the subsequent construction.

[0051] S102. Excavate the first foundation pit, then, build the top beams 7, the first concrete supports 8 and the retaining walls 9 after the said first foundation pit reached the first preset height, wherein, the said underground continuous walls 1 located on the outside of the said first foundation pit serve as main reinforcements of the said retaining walls 9 by passing through the first long main reinforcements 10, and the said underground continuous walls 1 located on the inside of the said first foundation pit would reserve steel rebar connectors at the top of the said top beams 7 by passing through the second long main reinforcements 11, as shown in figure 3 and figure 4.

40 [0052] Specifically, the first foundation pit can be excavated after the construction described in the said step S101 is completed and the preset strength is satisfied (wherein, the preset strength is subject to design drawings).

[0053] Specifically, prior to excavating the first foundation pit, it is necessary to complete pit dewatering 18 to 22 days in advance for the purpose of removing the water in the pit, and further 45 facilitate the construction of the first foundation pit.

[0054] Specifically, the said first preset height is subject to design drawings, and the standards for 4 the said first preset height shall be different according to different construction sites and scop&§/ef0743 construction.

[0055] Specifically, prior to the construction of the said top beams 7, the said first concrete supports 8 and the said retaining walls 9, it is necessary to chisel away the top of the said underground continuous walls to reserve space for building the said top beams 7.

[0056] Specifically, the construction specifications of the said top beams 7, the said first concrete supports 8 and the said retaining walls 9 shall be built according design drawings. Furthermore, the construction method adopts the available construction methods, which would not be further described herein.

[0057] S103. Build the second steel supports 12, the third steel supports 13, and the fourth steel supports 14 successively, as shown in Figure 5.

[0058] Specifically, the said second steel supports 12, the said third steel supports 13, and the said fourth steel supports 14 can be built, provided that the said top beam 7 and the said first concrete described in the said step S102 reach the preset strength (wherein, the preset strength is subject to design drawings).

[0059] Specifically, the specific steps of building the said second steel support comprise: excavating the second foundation pit, then, erecting the first steel supports and applying the first pre-applied axial force and the first servo system while excavating to 0.4 to 0.6 meters. After that, continue to excavate till the said second foundation pit reaches the second preset height. Wherein, the said second preset height is subject to design drawings, and the standards for the said second preset height shall be different according to different construction sites and scopes of construction.

[0060] Specifically, the said third steel supports 13 can be built, provided that the building of the said second concrete 12 is completed and the preset strength is satisfied (wherein, the preset strength is subject to design drawings). In addition, the specific steps of building the said third steel support comprise: excavating the third foundation pit, then, erecting the second steel supports and applying the second pre-applied axial force and the second servo system while excavating to 0.4 to 0.6 meters. After that, continue to excavate till the said third foundation pit reaches the third preset height. Wherein, the said third preset height is subject to design drawings, and the standards for the said third preset height shall be different according to different construction sites and scopes of construction.

[0061] Specifically, the said fourth steel supports 14 can be built, provided that the building of the said third concrete 13 is completed and the preset strength is satisfied (wherein, the preset strength is subject to design drawings). In addition, the specific steps of building the said fourth steel support comprise: excavating the fourth foundation pit, then, erecting the third steel supports and applying the third pre-applied axial force and the third servo system while excavating to 0.4 to 0.6 meters. After that, continue to excavate till the said fourth foundation pit reaches the fourth preset height. Wherein, the said fourth preset height is subject to design drawings, and the standards for the said fourth preset height shall be different according to different construction sites and scopes of construction. 40 [0062] Specifically, the specifications of the said first steel supports, the said second steel supports, and the said third steel supports are subject to design drawings, which may be the same or different. In addition, the strengths of the said first pre-added pre-applied axial force, the said second pre-added pre-applied axial force, and the said third pre-added pre-applied axial force are subject to design drawings, which may be the same or different. Meanwhile, the said first servo system, the 45 said second servo system, and the said third servo system are subject to design drawings, which may be the same or different. 5

[0063] Specifically, the construction specifications of the said second steel supports 12, thelé#80743 third steel supports 13, and the said fourth steel supports 14 are subject to design drawings. Furthermore, the construction method adopts the available construction methods, which would not be further described herein.

[0064] S104. Construct the underlying structure 15, the middle-floor structure 16 and the top-floor structure 17 successively; as shown in figure 6, figure 7, figure 8, and figure 9.

[0065] Specifically, the said underlying structure 15, the said middle-floor structure 16 and the said top-floor structure 17 can only be constructed after the construction of the fourth steel supports 14 described in step S103 is completed and the preset strength is satisfied (wherein, the preset strength is subject to design drawings).

[0066] Specifically, the construction of the said underlying structure 15 comprises the following steps:

[0067] Complete the construction of the bed courses of base plates, the waterproof layers of base plates, the protective layers of fine aggregate concrete, and the waterproof layers of side walls of the first part firstly.

[0068] Then, pour the base plates, the floor beams, and the concrete on the side walls of the first part;

[0069] Finally, dismantle the said third steel supports 13 and the said fourth steel supports 14 when the said base plates, the said floor beams, and the said concrete on the side walls of the first part reach the preset strength (wherein, the preset strength is subject to design drawings), then, set drainage openings, and dismantle well point pipes.

[0070] Specifically, the construction of the said middle-floor structure 16 comprises the following steps:

[0071] Complete the construction of the waterproof layers of middle plates, the center pillars, the middle plates, and the center sills as well as the concrete on the side walls of the second part firstly.

[0072] Then, dismantle the said second steel supports 12 and the said first concrete supports 8 when the said center pillars, the said middle plates, the said center sills, and the said concrete on the side walls of the second part reach the preset strength (wherein, the preset strength is subject to design drawings). Furthermore, if there are temporary columns 6 are equipped, it is necessary to dismantle the temporary columns 6.

[0073] Specifically, the construction of the said top-floor structure 17 comprises the following steps:

[0074] Complete the construction of the waterproof layers of top plates, the cap pillars, the top plates, and the top beams as well as the concrete on the side walls of the third part firstly;

[0075] Then, dismantle the said retaining walls 9 and chisel out the said first long main reinforcements 10 when the said cap pillars, the said top plates, the said top beams, and the said concrete on the side walls of the third part reach the preset strength (wherein, the preset strength is subject to design drawings). Meanwhile, complete the construction of both ends of the said top plates, and thus, both ends of the said top plates would extend outwards respectively to connect both sides of the said top beams 7.

40 [0076] Wherein, only the part located in the said retaining wall 9 shall be chiseled out when chiseling out the said first long main reinforcements 10, which would be utilized to suppress the extending part at both ends of the top plates. Furthermore, it is acceptable to chisel out the rest parts as required.

[0077] Specifically, the construction specifications of the said underlying structure 15, the said 45 middle-floor structure 16, and the said top-floor structure 17 are subject to design drawings. Furthermore, the construction method is the existing construction method, and no further 6 description will be made here. LU500743

[0078] S105. Construct the ground-floor structure, as shown in figure 10 and figure 11.

[0079] Specifically, the construction of the said ground-floor structure 18 shall be implemented according to design drawings. For this embodiment, the said ground-floor structure 18 is the structure of a station or hall.

[0080] Specifically, close the said drainage openings and the said dewatering wells 4 after the concrete of the ground-floor structure 18 reached the preset strength, and thus, the entire construction can be completed.

[0081] Specifically, the construction of the said ground-floor structure 18 shall be implemented according to design drawings. Furthermore, the construction method adopts the available construction methods, which would not be further described herein.

[0082] In conclusion, the embodiment of the present invention participated in anti-floating through the existing building envelope, and thus, it could improve the anti-floating effect; in addition, it overtopped the elevation of site leveling as there was no soil covered on the top plates of the structure; and thus, it could reduce the risk of leakage of water; furthermore, the present invention could reduce the cost of construction by virtue of reducing the utilization of uplift piles 3. Meanwhile, the present invention made the long main reinforcements participate in the protection of the first foundation pit at the early stage based on the structure that the said underground continuous walls 1 located on the outside of the first foundation pit are passed through the first long main reinforcements 10, while the underground continuous walls 1 located on the inside of the first foundation pit are passed through the second long main reinforcements 11, and thus, they could be served as anchor bars to be anchored into the top plates to participate in anti-floating later, and further the utilization rate could be improved.

[0083] It should be noted that the terms such as “including” or any other variant thereof utilized herein is intended to cover the meaning of non-exclusive inclusion. This means that the processes, articles, or devices containing a series of elements not only comprises these elements, but also comprises other elements which are not explicitly listed, or comprises elements inherent to such processes, articles, or devices.

[0084] The above only represents the preferred embodiment of the present invention, rather than imposing restrictions on the present invention. Any variation, equivalent replacement and improvement made according to the spirit and principle of the present invention shall fall within the scope of protection of the present invention. -_

Claims

. LU500743 Claims

1. A construction method of an anti-floating system, characterized in that comprising the following steps: S1. Build underground continuous walls, guide walls, uplift piles, dewatering wells, and high-pressure rotary jet grouting columns; S2. Excavate the first foundation pit, then, build the top beams, the first concrete supports and the retaining walls after the said first foundation pit reached the first preset height, wherein, the said underground continuous walls located on the outside of the said first foundation pit serve as main reinforcements of the said retaining walls by passing through the first long main reinforcements, and the said underground continuous walls located on the inside of the said first foundation pit would reserve steel rebar connectors at the top of the said top beams by passing through the second long main reinforcements; S3. Build the second steel supports, the third steel supports, and the fourth steel supports successively; S4. Construct the underlying structure, the middle-floor structure and the top-floor structure successively; S5. Construct the ground-floor structure.

2. The said construction method of an anti-floating system according to claim 1, characterized in that the said S3, i.e., build the second steel supports, the third steel supports, and the fourth steel supports successively, comprises the following steps: The specific steps of building the said second steel support comprise: excavating the second foundation pit, then, erecting the first steel supports and applying the first pre-applied axial force and the first servo system while excavating to 0.4 to 0.6 meters. After that, continue to excavate till the said second foundation pit reaches the second preset height; The specific steps of building the said third steel support comprise: excavating the third foundation pit, then, erecting the second steel supports and applying the second pre-applied axial force and the second servo system while excavating to 0.4 to 0.6 meters. After that, continue to excavate till the said third foundation pit reaches the third preset height; The specific steps of building the said fourth steel support comprise: excavating the fourth foundation pit, then, erecting the third steel supports and applying the third pre-applied axial force and the third servo system while excavating to 0.4 to 0.6 meters. After that, continue to excavate till the said fourth foundation pit reaches the fourth preset height.

3. The said construction method of an anti-floating system according to claim 1, characterized in that the said S4, i.e., construct the underlying structure, comprises the following steps: 8

Complete the construction of the bed courses of base plates, the waterproof layetd) #0743 base plates, the protective layers of fine aggregate concrete, and the waterproof layers of side walls of the first part firstly; then, pour the base plates, the floor beams, and the concrete on the side walls of the first part; Finally, dismantle the said third steel supports and the said fourth steel supports, then, set drainage openings, and dismantle well point pipes.

4. The said construction method of an anti-floating system according to claim 3, characterized in that the said S5, i.e., construct the ground-floor structure, comprises the following steps: close the said drainage openings and the said dewatering wells.

5. The said construction method of an anti-floating system according to claim 1, characterized in that the said S4, i.e., construct the middle-floor structure, comprises the following steps: Complete the construction of the waterproof layers of middle plates, the center pillars, the middle plates, and the center sills as well as the concrete on the side walls of the second part firstly; Then, dismantle the said second steel supports, the first concrete supports and the said first concrete supports.

6. The construction method of the anti-floating system according to claim 5, characterized in that the said S1, i.e., build the guide walls, the underground continuous walls, the uplift piles, the dewatering wells, and the high-pressure rotary jet grouting columns, further comprises the following steps: build temporary columns; Then, the specific steps of dismantling the said second steel supports, the first reinforced concrete supports and the first concrete supports further comprise: dismantling the said temporary columns.

7. The said construction method of an anti-floating system according to claim 1, characterized in that the said S4, i.e., construct the top-floor structure, comprises the following steps: Complete the construction of the waterproof layers of top plates, the cap pillars, the top plates, and the top beams as well as the concrete on the side walls of the third part firstly; Then, dismantle the said retaining walls and chisel out the said first long main reinforcements. After that, complete the construction of both ends of the said top plates, and thus, both ends of the said top plates would extend outwards respectively to connect both sides of the said top beams.

8. The construction method of the anti-floating system according to claim 1, characterized in that prior to the said S1, i.e., build the guide walls, the underground continuous walls, the uplift piles, the dewatering wells, and the high-pressure rotary jet -_

grouting columns, it also comprises the following steps: prepare the site to make the said-5}880743 level, then build fences.

9. The said construction method of an anti-floating system according to claim 1, characterized in that prior to the said S2, i.e., excavate the first foundation pit, it also comprises the following steps: complete pit dewatering 18 to 22 days in advance.

10. The said construction method of an anti-floating system according to claim 1, characterized in that prior to the said S2, i.e., build the top beams, the first concrete supports and the retaining walls, it also comprises the following steps: chisel away the top of the said underground continuous walls.

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