Combined enclosure pipe gallery foundation pit structure

Abstract

The utility model provides a combined enclosure pipe gallery foundation pit structure, and belongs to the field of foundation pit supporting. The structure comprises an enclosing purlin structure, a transverse supporting structure, a bottom plate structure, a pipe gallery and a drainage structure. The two groups of enclosing purlin structures are arranged in parallel and are vertically driven into stratums on the two sides of the pipe gallery, and the tops of the enclosing purlin structures are flush with an external natural terrace; the transverse supporting structure is perpendicular to the enclosing purlin structure and is flush with an external natural terrace; the bottom plate structure is arranged at the bottom of the pipe gallery, and the two ends of the bottom plate structure abut against the enclosing purlin structures on the two sides of the pipe gallery. The drainage structures are arranged on natural terraces at the two ends of the pipe gallery. The structure is simple, good in supporting performance and low in manufacturing cost.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of foundation pit support, concretely relates to a combined enclosure pipe gallery foundation pit structure. BACKGROUND

[0002] The underground pipe gallery foundation pit structure is an important part of urban infrastructure, and its design, construction and maintenance need to consider various factors to ensure its stability and safety.

[0003] Chinese patent CN118854979A (publication date: October 29, 2024) discloses a kind of anti-settling underground pipe gallery structure, it includes support layer, gap between pipe gallery and support layer, the support layer includes top arch, side wall and the foot cover layer of the bottom of side wall, the pipe gallery is at the opposite inner side of the top arch and the side wall, the foot cover layer is overlaid on the anchor shotcrete layer of the pipe gallery located foundation pit slope, and the foot cover layer and the mat concrete of the pipe gallery are independent of each other, the bottom of the foot cover layer is provided with end bearing pile, and the end bearing pile is used to transmit the upper load received by the support layer to bedrock bearing layer or hard soil layer.The application has the effect of reducing the settlement of pipe gallery bottom foundation.The pipe gallery structure is complex in structure, the overall bearing capacity is large, and the construction cost is high.

[0004] Chinese patent CN118375174A (publication date: July 23, 2024) discloses a fabricated pipe gallery foundation pit structure and a construction method thereof, which can perform normal drainage work through the drainage port, can prevent water droplets from falling on the pipe gallery structure, can prevent contact with the cast-in-place pile, thereby further improving the safety performance of the pipe gallery structure between the two cast-in-place piles, and the grouting groove is provided, so that the reinforcing pile can be poured in the inner cavity of the cast-in-place pile, and the reinforcing member is provided, which can have a good reinforcing effect.The structure of the drainage facility is complex, and the structure maintenance is difficult, the construction cost is high, for example, the structure bottom support seat includes a detection column, and the two ends are provided with cast-in-place piles, and the parts are not easy to maintain when damaged.

[0005] Therefore, it is necessary to design a pipe gallery foundation pit structure which is simple in structure, can meet the bearing strength of pipe gallery, and is low in construction cost. UTILITY MODEL CONTENTS

[0006] The utility model sets up PC method combination steel pipe pile and Larsen steel sheet pile as vertical support structure, and provides a combined enclosure pipe gallery foundation pit structure in combination with horizontal steel support, which comprises a surrounding purlin structure, a horizontal support structure, a bottom plate structure, a pipe gallery and a drainage structure.

[0007] The surrounding purlin structure is parallelly arranged in two groups and vertically punched into the stratum on both sides of the pipe gallery, and the top is flush with the external natural terrace.

[0008] The lateral support structure is perpendicular to the surrounding purlin structure and is naturally flush with the external ground level.

[0009] The bottom plate structure is arranged at the bottom of the pipe gallery and abuts against the surrounding purlin structure at both ends of the pipe gallery.

[0010] The drainage structure is arranged at the natural ground level at both ends of the pipe gallery.

[0011] Further, the surrounding purlin structure comprises PC method combined steel pipe piles and Larsen steel sheet piles; one PC method combined steel pipe pile is arranged every 1.5-3 m; the Larsen steel sheet piles are arranged in the gaps of the PC method combined steel pipe piles.

[0012] Further, the lateral support structure comprises a steel surrounding purlin, a steel support and a bracket; the steel support is welded to the surrounding purlin structure at both ends of the pipe gallery; the steel surrounding purlin is in an inverted I shape, has a stiffener welded inside and is arranged at both ends of the steel support; the bracket is welded to the surrounding purlin structure at both ends of the pipe gallery and is arranged below the steel surrounding purlin.

[0013] Further, the bottom plate structure comprises a bottom plate force transmission belt, a bottom plate, filled soil and a pipe gallery bottom plate; the bottom plate force transmission belt is cast at both ends of the bottom plate and is connected to the surrounding purlin structure at both sides of the pipe gallery; the filled soil and the pipe gallery bottom plate are arranged above the bottom plate force transmission belt and the bottom plate; the filled soil is cast at both ends of the pipe gallery bottom plate and is connected to the surrounding purlin structure at both sides of the pipe gallery.

[0014] Further, the Larsen steel sheet piles and the PC method combined steel pipe piles are connected by locks, the locks are arranged along the PC method combined steel pipe piles and are welded to the PC method combined steel pipe piles on both sides.

[0015] Further, the surrounding purlin structure is vertical and the top is flat.

[0016] Further, the PC method combined steel pipe piles and the Larsen steel sheet piles of the surrounding purlin structure are arranged along a straight line or at an angle, for adapting to the terrain requirements.

[0017] Further, the bracket is a right triangular prism, the right side is arranged along the bottom plate structure and the surrounding purlin structure, and the inclined side is arranged along the surrounding purlin structure at an inclination angle of 40-45 degrees.

[0018] Further, the steel support is arranged horizontally and the elevations at both ends are consistent.

[0019] Compared with the prior art, the application has the following advantages and effects:

[0020] 1. The application provides a combined enclosure pipe gallery foundation pit structure, PC method combined steel pipe pile and Larsen steel sheet pile are arranged as a vertical supporting structure, combined with a horizontal steel support, the structure is simple, and good supporting effect can be provided for the pipe gallery.

[0021] 2. The application provides a combined enclosure pipe gallery foundation pit structure, PC method combined steel pipe pile and Larsen steel sheet pile can be recycled, thereby reducing construction cost.

[0022] The above is only a summary of the technical scheme of the application, in order to more clearly understand the technical means of the application, so as to be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the application more obvious and easy to understand, the following will be described in detail with the preferred embodiment of the application and the accompanying drawings as follows.

[0023] According to the detailed description of the specific embodiments of the application in the following text combined with the drawings, those skilled in the art will be more clear about the above and other purposes, advantages and characteristics of the application. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, obviously, the drawings in the following description are some embodiments of the application, and those skilled in the art can also obtain other drawings according to these drawings without creating labor. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual proportion.

[0025] Figure 1 is a combined enclosure pipe gallery foundation pit structure schematic diagram of an embodiment of the utility model;

[0026] Figure 2 is a surrounding purlin structure schematic diagram of a combined enclosure pipe gallery foundation pit structure of an embodiment of the utility model; Figure 2 (a) is a surrounding purlin structure schematic diagram with PC method combined steel pipe pile as a corner; Figure 2 (b) is a surrounding purlin structure schematic diagram with Larsen steel sheet pile as a corner; Figure 2 (c) is a general surrounding purlin structure schematic diagram.

[0027] Reference numerals: 1, PC method combined steel pipe pile; 2, Larsen steel sheet pile; 3, steel surrounding purlin; 4, steel support; 5, corbel; 6, bottom plate force transmission belt; 7, bottom plate; 8, filled soil; 9, pipe gallery bottom plate. DETAILED DESCRIPTION

[0028] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the drawings in the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. In the following description, specific details such as specific configurations and components are provided only to help a comprehensive understanding of the embodiments of the present application. Therefore, those skilled in the art should understand that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. In addition, in order to be clear and concise, the description of known functions and structures is omitted in the embodiments. It should be understood that the "one embodiment" or "the embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "one embodiment" or "the embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner.

[0029] In addition, reference numerals and / or letters can be repeated in different examples in the present application. Such repetition is for the purpose of simplification and clarity, and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0030] The term "and / or" herein is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, B exists alone, and A and B exist simultaneously. The term " / and" herein is a description of another association relationship of the associated objects, which means that there can be two relationships, for example, A / and B can mean that A exists alone and A and B exist simultaneously. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after it.

[0031] It should also be noted that the relationship terms such as first and second in the present application are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion.

[0032] Embodiment 1

[0033] As Figure 1 shown, the present embodiment provides a combined enclosure pipe gallery foundation pit structure, which comprises an enclosure purlin structure, a transverse support structure, a bottom plate structure, a pipe gallery and a drainage structure.

[0034] The surrounding purlin structure is provided in parallel with two groups, is vertically punched into the stratum on both sides of the pipe gallery, and the top is flush with the external natural floor; the transverse support structure is perpendicular to the surrounding purlin structure, and the lower end of the left side elevation is flush with the natural floor; the bottom plate structure is arranged at the bottom of the pipe gallery, and the two ends abut against the surrounding purlin structure on both sides of the pipe gallery; and the drainage structure is arranged on the natural floor at both ends of the pipe gallery.

[0035] Further, the surrounding purlin structure comprises a PC method combined steel pipe pile 1 and a Larsen steel sheet pile 2; one PC method combined steel pipe pile 1 is arranged every 1.5-3 m; the PC method combined steel pipe pile 1 is provided with the Larsen steel sheet pile 2 in the gap; the Larsen steel sheet pile 2 is connected with the PC method combined steel pipe pile 1 through a lock buckle, the lock buckle is arranged along the length of the PC method combined steel pipe pile 1, and is welded on both sides of the PC method combined steel pipe pile 1.

[0036] The left side natural floor elevation is -2 m, and the right side natural floor elevation is 0 m; the length of the PC method combined steel pipe pile on the left side is 12 m, and the length of the Larsen IV steel sheet pile is 9 m; the PC method combined steel pipe pile on the right side is arranged in intervals by short piles with a length of 12 m and long piles with a length of 14 m, and the length of the Larsen IV steel sheet pile is 12 m.

[0037] Further, the transverse support structure comprises a profile steel surrounding purlin 3, a profile steel support 4 and a corbel 5; the profile steel support 4 is welded at both ends of the surrounding purlin structure on both sides of the pipe gallery; the profile steel surrounding purlin 3 is in an inverted I shape, is internally welded with a stiffened plate, and is arranged at both ends of the profile steel support 4; and the corbel 5 is welded to the surrounding purlin structure on both sides of the pipe gallery and is arranged below the profile steel surrounding purlin 3.

[0038] The PC method combined steel pipe pile adopts a spiral welded pipe with a diameter of 630 mm and a wall thickness of 14 m, and the steel pipe adopts Q355 steel. The length, combined form, material strength and the like of the PC method combined steel pipe pile should meet the design requirements and the corresponding steel structure specifications. The PC method combined steel pipe pile should adopt integral material, and when welded in sections, the welding should adopt a bevel joint with equal strength and be welded with four arc-shaped steel plates outside. The bevel joint form and requirements of the butt weld should meet the relevant provisions of the current national industry standard “Technical Specification for Welding of Building Steel Structures” JGJ81, the welding quality grade should not be lower than level two, and non-destructive testing such as ultrasonic testing should be used before construction. The welding joint of a single steel pipe pile should not be more than two, the distance of the welding joint from the pit bottom surface should not be less than 2 m, and the joints of adjacent two steel pipe piles should be staggered by more than 1 m. The welding joint form and welding quality of the steel pipe pile should also meet the requirements of recycling and pulling out the steel pipe pile.

[0039] The steel material of the profile steel support is Q355B. The material is a structure special material without deformation and crack.

[0040] Larsen steel sheet pile selects the Larsen steel sheet pile without obvious deformation and no distortion, which should be trimmed before construction. First, the positioning pile is constructed, and the guide steel is fixed. The positioning deviation of the positioning pile is not more than 50 mm.

[0041] The connection between the steel support purlin and the PC method combined copper pipe pile is full-welded, and the height of the weld is 8 mm; a corbel is arranged every 2.0 m, the connection between the corbel and the PC method combined steel pipe pile is surrounded by welding, and the height of the weld is 8 mm; the steel support purlin should be welded with a stiffener plate, which is arranged at 0.4 m / 1 block at the support and 1.0 m / 1 block at the non-support;

[0042] Further, the bottom plate structure comprises a bottom plate force transmission belt 6, a bottom plate 7, filled soil 8, and a pipe gallery bottom plate 9; the bottom plate force transmission belt 6 is poured at both ends of the bottom plate 7 and connected with the surrounding purlin structure on both sides of the pipe gallery; the filled soil 8 and the pipe gallery bottom plate 9 are located above the bottom plate force transmission belt 6 and the bottom plate 7, and the filled soil 8 is poured at both ends of the pipe gallery bottom plate 9 and connected with the surrounding purlin structure on both sides of the pipe gallery.

[0043] Further, the verticality plane deviation of the PC method combined steel pipe pile 1 is not more than 10 mm, and the flatness elevation error is not more than 100 mm.

[0044] Further, the verticality plane deviation of the Larsen steel sheet pile 2 is not more than 10 mm, and the flatness elevation error is not more than 100 mm.

[0045] Further, as shown in Figure 2 When the PC method combined steel pipe pile 1 is located at the corner, the two ends of the Larsen steel sheet pile 2 form a certain angle; when the Larsen steel sheet pile 2 is located at the corner, the end of one piece of Larsen steel sheet pile 2 is welded to the middle of another piece of Larsen steel sheet pile 2 to form a certain angle, and the two ends are connected with the PC method combined steel pipe pile 1.

[0046] Further, the elevation angle of the corbel 5 is 90-95 degrees.

[0047] Further, the center elevation deviation of the steel support 4 is not more than 30 mm, and the elevation difference between the two ends of the steel support 4 is not more than 20 mm.

[0048] Further, characterized in that, after the pipe gallery construction is completed, the PC method combined steel pipe pile 1 and the Larsen steel sheet pile 2 are recycled, after the Larsen steel sheet pile 2 is recycled, pure cement slurry is used for grouting in the slot wall; when the PC method combined steel pipe pile 1 is recycled, the PC method combined steel pipe pile 1 is provided with a grouting hole, and pure cement slurry is used for grouting.

[0049] The technical effect of the embodiment is that the combined enclosure pipe gallery foundation pit structure provided by the embodiment has a simple structure and high supporting strength.

[0050] Embodiment 2

[0051] In order to facilitate the understanding of the structural composition and connection relationship of the combined enclosure pipe gallery foundation pit structure in Embodiment 1, the construction method of the combined enclosure pipe gallery foundation pit structure is provided in this embodiment, which comprises the following steps:

[0052] 1) Construct the surrounding purlin structure and the transverse support structure.

[0053] 2) After the surrounding purlin structure and the transverse support structure are installed, the earthwork is excavated to the pipe gallery foundation bottom according to the structural drawing, and then the bottom plate structure is constructed. An oil felt isolation layer should be arranged between the bottom plate force transmission belt 6 and the surrounding purlin structure.

[0054] 3) After the bottom plate force transmission belt 6 reaches 80% of the design strength, all the transverse support structures are removed.

[0055] 4) During the removal of the support, the monitoring of the enclosure body and the surrounding environment should be strengthened.

[0056] 5) Continue to construct the pipe gallery outer wall and the pipe gallery top plate. After the pipe gallery outer wall and the pipe gallery top plate reach 80% of the design strength, the backfilling soil is layered and rammed. The thickness of each layer of artificial ramming is not greater than 250mm, and the thickness of each layer of mechanical ramming is not greater than 300mm, and the waterproof layer should be prevented from being damaged. The backfilling soil should not use silt, cultivated soil, frozen soil, swelling soil, household garbage and soil with organic matter content greater than 5%. The compaction coefficient of the backfilling soil is required to be not less than 0.94.

[0057] 6) Surrounding purlin structure recovery:

[0058] 6.1) The backfilling soil of the foundation pit is preferably silt soil and is layered and backfilled and watered to compact. The backfilling soil is preferably 200-300m higher than the ground. In order to ensure the quality of the backfilling of the foundation pit, low-strength concrete or foamed concrete can be used for backfilling in the environmentally sensitive parts.

[0059] 6.2) When the recovery equipment must walk on the pipe gallery top plate due to insufficient recovery space or local material stacking, the pipe gallery top plate should be strengthened and the design should be agreed, and the thickness of the backfilling soil in the equipment walking area should be greater than 500mm.

[0060] 6.3) The site in the working area of the recovery equipment should be flat and fully paved with steel board trestle to ensure that the soil under the machinery is flat and effectively disperses the force to reduce the influence on the road or underground pipeline.

[0061] 6.4) When the PC method combined steel pipe pile 1 is recovered, the trench should be excavated in sections, and the length should not be greater than 5 meters. The PC method combined steel pipe pile 1 should be immediately backfilled after recovery.

[0062] 6.5) When recovering the waler structure, first pull and recover the Larssen sheet piles 2. After recovering the Larssen sheet piles 2, the trench wall should be grouted with pure cement grout in a timely manner. Then, pull and recover the steel pipe piles. Grouting holes are set in the steel pipe piles. Pure cement grout should be used for grouting during the recovery process. The cement grouting pressure is 2-3 Pa, and the water-cement ratio of the grout is 0.5-0.6. The cement usage per meter along the length of the Larssen sheet piles 2 should not be less than 18 kg, and the cement usage per meter along the length of the 630X14PC combined steel pipe piles 1 should not be less than 40 kg. Specific parameters can be adjusted appropriately according to the actual site conditions.

[0063] 6.6) During the recovery process of PC method combined steel pipe pile 1, the foundation pit monitoring unit should increase the monitoring frequency and strengthen on-site observation. If the monitoring and observation data are abnormal or exceed the alarm value, the soil should be backfilled immediately and the recovery construction should be stopped.

[0064] 6.7) After the PC method combined steel pipe piles are recovered, they should not be piled up too much or for too long at the edge of the foundation pit, and should be transported out of the site in a timely manner.

[0065] 6.8) For areas with high environmental protection requirements, advanced equipment such as non-resonant hammers or static extraction devices can be used for jump extraction and recovery of steel pipe piles, with strict control over the number of piles removed and the time interval between extractions. Simultaneously, Larssen piles can be installed at the top of the slope to further reduce adverse impacts on the surrounding environment.

[0066] Technical advantages of this embodiment: This embodiment provides a construction method for a combined retaining pipe gallery foundation pit structure, which is simple to construct and has low project cost.

[0067] The above description is merely a preferred embodiment of this utility model and does not limit the scope of protection of this utility model. For those skilled in the art, this utility model can have various modifications and variations. Any changes, modifications, substitutions, integrations, and parameter alterations made to these embodiments within the spirit and principles of this utility model, through conventional substitutions or methods that achieve the same function without departing from the principles and spirit of this utility model, fall within the scope of protection of this utility model.

Claims

1. A combined enclosure pipe rack foundation pit structure, characterized in that, The pipe gallery comprises a surrounding purlin structure, a transverse support structure, a bottom plate structure, a pipe gallery, and a drainage structure. The surrounding purlin structure is parallel to two groups, and is vertically punched into the stratum on both sides of the pipe gallery, and the top is flush with the external natural ground. The transverse support structure is perpendicular to the surrounding purlin structure, and is flush with the external natural ground. The bottom plate structure is arranged at the bottom of the pipe gallery, and the two ends abut against the surrounding purlin structures on both sides of the pipe gallery. The drainage structure is arranged on the natural ground at both ends of the pipe gallery.

2. The combined support pipe gallery foundation pit structure according to claim 1, characterized in that, The surrounding purlin structure comprises a PC method combined steel pipe pile (1) and a Larsen steel sheet pile (2); one PC method combined steel pipe pile (1) is arranged every 1.5-3 m; the PC method combined steel pipe pile (1) is provided with the Larsen steel sheet pile (2) in the gap.

3. The combined support pipe gallery foundation pit structure according to claim 1, characterized in that, The transverse support structure comprises a profile steel surrounding purlin (3), a profile steel support (4), and a corbel (5). The profile steel support (4) is welded at both ends of the surrounding purlin structure on both sides of the pipe gallery. The profile steel surrounding purlin (3) is in an inverted I shape, is internally welded with a stiffened plate, and is arranged at both ends of the profile steel support (4). The corbel (5) is welded to the surrounding purlin structure on both sides of the pipe gallery and is arranged below the profile steel surrounding purlin (3).

4. The combined support pipe gallery foundation structure according to claim 1, wherein The bottom plate structure comprises a bottom plate force transmission belt (6), a bottom plate (7), filled soil (8), and a pipe gallery bottom plate (9). The bottom plate force transmission belt (6) is cast at both ends of the bottom plate (7) and is connected with the surrounding purlin structure on both sides of the pipe gallery. The filled soil (8) and the pipe gallery bottom plate (9) are located above the bottom plate force transmission belt (6) and the bottom plate (7), and the filled soil (8) is cast at both ends of the pipe gallery bottom plate (9) and is connected with the surrounding purlin structure on both sides of the pipe gallery.

5. The combined support pipe gallery foundation structure according to claim 2, wherein The Larsen steel sheet pile (2) is connected with the PC method combined steel pipe pile (1) through a lock buckle, the lock buckle is arranged along the PC method combined steel pipe pile (1) in the length direction, and is double-sided welded with the PC method combined steel pipe pile (1).

6. The combined support pipe gallery foundation structure according to claim 2, wherein The surrounding purlin structure is vertical and the top is flat.

7. The combined support pipe gallery foundation structure according to claim 2, wherein The PC method combined steel pipe pile (1) and the Larsen steel sheet pile (2) of the surrounding purlin structure are arranged along a straight line or at an angle, for adapting to the terrain requirements.

8. The combined support pipe gallery foundation structure according to claim 3, wherein The corbel (5) is a right triangular prism, the right angle side is arranged along the bottom plate structure and the surrounding purlin structure, and the inclined side is arranged along the surrounding purlin structure at an inclination angle of 40-45 degrees.

9. The combined support pipe gallery foundation structure according to claim 3, wherein The profile steel support (4) is horizontally arranged, and the elevations at both ends are consistent.

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