Section steel pulling-out construction method
By using isolation sleeves and grouting sealing technology during the steel section removal process, the problems of material waste and leakage caused by steel section cutting were solved, and the recycling of steel section and waterproofing of the foundation slab were achieved.
Patent Information
- Application Number
- CN202511653889.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-12
- Publication Date
- 2026-02-06
AI Technical Summary
Traditional steel cutting methods lead to material waste and leakage risks, especially in foundation pit support construction where the steel cutting points are weak and prone to leakage.
An isolation sleeve is used to separate the foundation slab from the steel profile. After the steel profile is removed, grout is injected into the isolation sleeve to make it dense. Combined with steel bars and waterstops, it is sealed to ensure that the steel profile can be recycled and to reduce the risk of leakage.
It reduces material waste, improves the environmental friendliness of construction, lowers the risk of leakage, and achieves the recycling and reuse of steel profiles and the waterproofing effect of the foundation slab.
Smart Images
Figure CN121473352A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of foundation pit construction, in particular to a type steel pulling-out construction method. BACKGROUND
[0002] In the traditional foundation pit supporting construction technology, type steel with a depth greater than the depth of the foundation pit bottom is driven into the soil for soil reinforcement. After the completion of the foundation bottom plate construction in the foundation pit, the type steel used for reinforcing the soil is cut off above the foundation bottom plate, leaving half of the type steel in the soil, which causes material waste. In addition, the position of the type steel cutting is a weak point, which is prone to leakage. Therefore, there is an urgent need to provide a new solution. SUMMARY
[0003] The present application aims to overcome the defects of the prior art and provide a type steel pulling-out construction method to solve the problems of material waste and easy leakage caused by the existing type steel cutting method.
[0004] The technical solution to achieve the above-mentioned purpose is: The present application provides a type steel pulling-out construction method, comprising the following steps: Driving type steel into the soil according to the reinforcement scheme within the design range of the foundation pit; Excavating the foundation pit to a set depth and constructing a cushion layer at the bottom of the pit; Providing a spacer sleeve, the height of the provided spacer sleeve is adapted to the thickness of the foundation bottom plate to be constructed, and the provided spacer sleeve is sleeved on the type steel; Constructing a foundation bottom plate on the cushion layer; Pulling out the type steel and grouting into the spacer sleeve to compact the gap formed after the type steel is pulled out.
[0005] The further improvement of the type steel pulling-out construction method is that the provided spacer sleeve comprises a first part and a second part connected in abutment, and when the spacer sleeve is sleeved on the type steel, the first part and the second part are clamped on both sides of the type steel, and then the first part and the second part are connected in abutment.
[0006] The further improvement of the type steel pulling-out construction method is that the first part and the second part of the spacer sleeve are steel structures, and when the first part and the second part are connected in abutment, the first part and the second part are welded and fixed.
[0007] The further improvement of the type steel pulling-out construction method is that it further comprises: providing a first water stop plate, the outer contour of the provided first water stop plate is adapted to the outer contour of the first part, and the first water stop plate is connected vertically on the outside of the first part. A second water stop plate is provided, the outer contour of the provided second water stop plate is matched with the outer contour of the second part, and the second water stop plate is connected vertically on the outside of the second part; When the first part and the second part are connected in butt joint, the ends of the first water stop plate and the second water stop plate are connected in butt joint.
[0008] The further improvement of the type steel pulling construction method is that when the grouting is performed in the isolation sleeve, the top surface level of the grout formed by the grouting is lower than the top surface level of the isolation sleeve. Steel bars are provided, the steel bars are embedded in the isolation sleeve, and the steel bars are welded and sealed with the isolation sleeve.
[0009] The further improvement of the type steel pulling construction method is that when the grouting is performed in the isolation sleeve, waterproof mortar is grouted in the isolation sleeve.
[0010] The further improvement of the type steel pulling construction method is that when the type steel is driven into the soil according to the reinforcement scheme, the type steel is driven to a set burial depth, and the set burial depth of the type steel is greater than the set depth of the foundation pit.
[0011] The further improvement of the type steel pulling construction method is that the driven type steel is an I-shaped steel.
[0012] The beneficial effects of the type steel pulling construction method are: The type steel pulling construction method separates the foundation bottom plate from the type steel through the isolation sleeve, so that the type steel can be directly pulled out after the foundation bottom plate is constructed, material waste is reduced, and green development is met.
[0013] The type steel pulling construction method sets the first water stop plate and the second water stop plate connected in butt joint on the outside of the isolation sleeve, can stop water at the isolation sleeve, and reduces leakage risks.
[0014] The type steel pulling construction method grouts waterproof mortar in the inside of the isolation sleeve, and sets steel bars and welds and seals the top of the isolation sleeve, so that the leakage risk of the foundation bottom plate can be reduced. DETAILED DESCRIPTION
[0015] Figure 1 The type steel pulling construction method is a flowchart.
[0016] Figure 2 The type steel pulling construction method is a flowchart.
[0017] Figure 3 The type steel pulling construction method is a flowchart.
[0018] Figure 4 Figure 3 is a perspective view of a connection between the steel section and the isolation sleeve, the first water stop plate and the second water stop plate in the steel section pulling construction method of the present application.
[0019] Figure 5 Figure 4 is a sectional view of the steel section penetrating the foundation bottom plate in the steel section pulling construction method of the present application.
[0020] Figure 6 Figure 5 is a sectional view of the grouting sealing position after the steel section is pulled out in the steel section pulling construction method of the present application. Figure 5 Figure 6 is a sectional view of A-A in Figure 5.
[0021] Figure 7 Figure 7 is a sectional view of the grouting sealing position after the steel section is pulled out in the steel section pulling construction method of the present application. DETAILED DESCRIPTION
[0022] The present application will be further described below in conjunction with the drawings and specific embodiments.
[0023] Referring to Figure 1 , the present application provides a steel section pulling construction method, which is used to solve the problems of great material waste caused by the method of cutting and leaving part of the steel section in the soil when the traditional foundation pit uses the steel section to reinforce the soil and the problem of easy leakage caused by the weak point formed by the cutting. The construction method of the present application separates the foundation bottom plate from the steel section by setting an isolation sleeve, and then pulls out the steel section from the soil after the construction of the foundation bottom plate is completed. The pulled-out steel section can be recycled and reused, thus reducing material waste and meeting the green development. In addition, the water stop plate (formed by the butt joint of the first water stop plate and the second water stop plate) is arranged outside the isolation sleeve to reduce the leakage risk, the inside of the isolation sleeve is filled with waterproof mortar, and the top is cooperatively provided with a reinforcing bar and a welded sealing to further reduce the risk of bottom plate leakage. The steel section pulling construction method of the present application will be described below in conjunction with the drawings.
[0024] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.
[0025] Referring to Figure 1 , a flowchart of the steel section pulling construction method of the present application is shown. The steel section pulling construction method of the present application will be described below in conjunction with Figure 1 .
[0026] As shown in Figure 1 , the steel section pulling construction method of the present application includes the following steps: Step S11 is performed, in which the steel section is driven into the soil according to the reinforcement scheme within the design range of the foundation pit; then step S12 is performed; Step S12 is performed, in which the foundation pit is excavated to a set depth, and a cushion layer is constructed at the bottom of the pit; then step S13 is performed; The step S13 is performed to provide a spacer sleeve, the height of the provided spacer sleeve is adapted to the thickness of the foundation slab to be constructed, and the provided spacer sleeve is sleeved on the section steel; then the step S14 is performed; The step S14 is performed to construct the foundation slab on the cushion layer; then the step S15 is performed. The step S15 is performed to pull out the section steel, and grouting is performed in the spacer sleeve to compact the gap formed after the section steel is pulled out.
[0027] Further, as shown in Figure 2 and Figure 3 , the section steel 21 is driven into the soil body to reinforce the soil body below the bottom of the foundation pit, so as to support the excavation of the foundation pit.
[0028] When the section steel 21 is driven into the soil body according to the reinforcement scheme, the section steel 21 is driven to a set burial depth H2, and the set burial depth H2 of the section steel 21 is greater than the set depth H1 of the foundation pit. That is, the section steel 21 is driven to a certain depth below the bottom of the foundation pit.
[0029] Further, the driven section steel 21 is an I-shaped steel.
[0030] Further, the driven section steel 21 has a deep burial depth, and the section steel 21 is formed by splicing a plurality of units 21a, two adjacent units 21a are connected by welding at the splicing position, and a welding seam 211 is formed at the splicing position, and the two adjacent units 21a are connected together through the welding seam 211.
[0031] When the section steel 21 is driven, the units 21a can be welded together first, and then the section steel 21 is driven, or one unit 21a can be driven into the soil body, and then another unit 21a is welded at the top, and then the driving continues downward until the section steel 21 is driven to the set burial depth.
[0032] The section steel 21 is preferably arranged at intervals within the range of the foundation pit.
[0033] In one specific embodiment of the present application, as shown in Figure 5 , after the section steel 21 is completely inserted, the foundation pit is excavated to the set depth, and then the cushion layer 31 is constructed at the bottom of the pit, and as shown in Figure 4 and Figure 6 , after the construction of the cushion layer 31, the spacer sleeve 22 is sleeved on the section steel 21, the height of the spacer sleeve 22 is adapted to the thickness of the foundation slab 32 to be constructed, and the spacer sleeve 22 is used to isolate the foundation slab 32 to be poured from the section steel 21, so that the section steel 21 can be pulled out after the construction of the foundation slab 32.
[0034] Further, the isolation sleeve 22 comprises a first part 22a and a second part 22b which are connected in abutment, and when the isolation sleeve 22 is sleeved on the shaped steel 21, the first part 22a and the second part 22b are sleeved on both sides of the shaped steel 21, and then the first part 22a and the second part 22b are connected in abutment.
[0035] The isolation sleeve 22 is designed as a split structure comprising the first part 22a and the second part 22b, which facilitates the sleeving of the isolation sleeve 22 on the shaped steel 21.
[0036] Further, the first part 22a and the second part 22b of the isolation sleeve 22 are steel structures, and when the first part 22a and the second part 22b are connected in abutment, the first part 22a and the second part 22b are welded and fixed. Preferably, the first part 22a and the second part 22b are made of a 5mm thick steel plate.
[0037] Further, the first part 22a and the second part 22b of the isolation sleeve 22 are steel structures, and when the first part 22a and the second part 22b are connected in abutment, the first part 22a and the second part 22b are welded and fixed. Preferably, the first part 22a and the second part 22b are made of a 5mm thick steel plate. A second water stop plate 24 is provided, and the outer contour of the second water stop plate 24 is adapted to the outer contour of the second part 22b, and the second water stop plate 24 is connected perpendicularly to the outer side of the second part 22b. When the first part 22a and the second part 22b are connected in abutment, the end portions of the first water stop plate 23 and the second water stop plate 24 are connected in abutment.
[0038] Preferably, the first water stop plate 23 and the second water stop plate 24 are arranged at the middle portions of the first part 22a and the second part 22b, and the arrangement positions of the first water stop plate 23 and the second water stop plate 24 correspond to each other, and then the first water stop plate 23 and the second water stop plate 24 are welded and fixed to form a complete water stop ring. Preferably, the first water stop plate 23 and the second water stop plate 24 are water stop steel plates.
[0039] The width of the first water stop plate 23 and the second water stop plate 24 is 50mm, and the thickness is 5mm.
[0040] In one specific embodiment of the present application, as shown in Figure 7 After the shaped steel 21 is pulled out, a gap is formed in the position where the shaped steel 21 is pulled out, i.e. the inside of the isolation sleeve 22, and a sealing structure 25 is formed by grouting and compacting the gap.
[0041] Further, the sealing structure 25 is formed by grouting waterproof mortar, i.e. waterproof mortar is grouted into the isolation sleeve when grouting the isolation sleeve.
[0042] Further, when grouting the isolation sleeve 22, the grouting slurry top surface is lower than the top surface of the isolation sleeve 22. Steel bars 26 are embedded in the isolation sleeve 22 and are welded to the isolation sleeve 22. The welding forms a welding line 27 on the top of the isolation sleeve 22.
[0043] The steel bars 26 form an outer contour that is consistent with the contour of the inside of the isolation sleeve 22. The first and second water stops 23 and 24 on the outside of the isolation sleeve 22 and the sealing structure 25 formed by the waterproof mortar, the steel bars 26 and the welding line 27 on the top of the isolation sleeve 22 can reduce the risk of leakage of the floor.
[0044] The above detailed description of the application is made in conjunction with the embodiments shown in the drawings. Those skilled in the art can make various changes to the application according to the above description. Therefore, some details in the embodiments should not be construed as limiting the application, and the scope of the application is defined by the appended claims.
Claims
1. A method of construction of a section steel pull-out, characterized in that, The method comprises the following steps: driving a steel bar into the soil according to a reinforcement scheme within the design range of the foundation pit; excavating the foundation pit to a set depth and constructing a cushion layer at the bottom of the pit; providing a spacer sleeve, the height of the provided spacer sleeve being matched with the thickness of the foundation slab to be constructed, and sleeving the provided spacer sleeve on the steel bar; constructing the foundation slab above the cushion layer; pulling out the steel bar and grouting into the spacer sleeve to compact the gap formed after the steel bar is pulled out.
2. The method of removing a shape steel according to claim 1, wherein The provided spacer sleeve comprises a first part and a second part which are connected in abutment, and when the spacer sleeve is sleeved on the steel bar, the first part and the second part are clamped on both sides of the steel bar, and then the first part and the second part are connected in abutment.
3. The method of removing a shape steel according to claim 2, wherein The first part and the second part of the spacer sleeve are steel structures, and when the first part and the second part are connected in abutment, the first part and the second part are welded and fixed.
4. The method of removing a shape steel according to claim 2, wherein Further comprising: providing a first water stop plate, the outer contour of the provided first water stop plate being matched with the outer contour of the first part, and the first water stop plate being connected perpendicularly on the outer side of the first part; providing a second water stop plate, the outer contour of the provided second water stop plate being matched with the outer contour of the second part, and the second water stop plate being connected perpendicularly on the outer side of the second part; when the first part and the second part are connected in abutment, the end portions of the first water stop plate and the second water stop plate are connected in abutment.
5. The method of removing a shape steel according to claim 1, wherein When grouting into the spacer sleeve, the grouting forms a slurry top surface with an elevation lower than the top surface elevation of the spacer sleeve; providing a steel bar, embedding the steel bar into the spacer sleeve, and welding and sealing the steel bar with the spacer sleeve.
6. The method of removing a shape steel according to claim 1, wherein When grouting into the spacer sleeve, waterproof mortar is grouted into the spacer sleeve.
7. The method of removing a shape steel according to claim 1, wherein When driving the steel bar into the soil according to the reinforcement scheme, the steel bar is driven to a set burial depth, and the set burial depth of the steel bar is greater than the set depth of the foundation pit.
8. The method of removing a shape steel according to claim 1, wherein The driven steel bar is an I-beam.