Anchoring type supporting structure

Abstract

The invention particularly discloses an anchoring type supporting structure, which belongs to the technical field of engineering construction, and comprises Larsen steel sheet piles, steel sleeves are arranged at the heads of the Larsen steel sheet piles, the steel sleeves are connected with reinforcing meshes, the reinforcing meshes are anchored on an anchoring area roadbed, a hardened road surface is arranged above the anchoring area roadbed, and the hardened road surface is connected with a reinforcing mesh. A high-pressure jet grouting pile is arranged on the inner side of the lower portion of the Larsen steel sheet pile. According to the anchoring type supporting structure, the head of the Larsen steel sheet pile is connected with the reinforcing mesh, the reinforcing mesh is anchored into the anchoring area roadbed, and the high-pressure jet grouting pile on the lower portion of the Larsen steel sheet pile is matched, so that deformation and displacement of the Larsen steel sheet pile in the working process can be effectively reduced, the construction requirement is met, and site utilization is maximized; and the structural safety can be ensured.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of engineering construction, and specifically discloses an anchoring type supporting structure. BACKGROUND

[0002] In the field of engineering construction, the construction environment of underground structures is much more complex than that on the ground, and often has to face diversified geological conditions such as soft soil, sandy soil and rock strata. In addition, the underground space is closed and limited by itself, and the construction space is strictly limited, which puts forward very high requirements for the performance of the supporting structure. The scientific selection and reasonable application of the supporting structure are directly related to the safety factor of engineering construction, progress guarantee and the stability of surrounding buildings.

[0003] At present, most underground projects still generally rely on various supporting structures to ensure construction safety and surrounding environment stability, among which the Larsen steel sheet pile occupies a place due to its unique advantages. Its construction process is relatively simple, and a supporting system can be quickly driven into the ground by professional machinery, greatly shortening the construction period. At the same time, compared with some large concrete supporting structures, the material cost and construction cost of the Larsen steel sheet pile are relatively low, and it has the characteristics of recycling and reuse, which meets the economic requirements to a certain extent, so it has been widely used in subway foundation pits, municipal pipe network excavation and many other projects.

[0004] However, it cannot be ignored that the structural defects of the Larsen steel sheet pile itself are increasingly prominent. In the process of bearing the load such as soil pressure and water pressure, the problem of large deformation and high horizontal displacement value is particularly obvious. This defect is not trivial: on the one hand, excessive deformation may lead to a decrease in the overall stability of the supporting system, which may need additional investment in manpower and material resources for reinforcement, or may cause instability of the supporting structure, directly threatening the safety of construction personnel; on the other hand, excessive displacement of the steel sheet pile will cause strong disturbance to the surrounding soil, destroy the original stress balance of the soil, and then trigger a series of chain reactions, including uneven settlement of the ground, leading to road surface cracking and collapse; the foundation of adjacent buildings may also be offset, and the wall may crack, which may even affect the safety of the building in serious cases. These problems form a sharp contradiction with the high requirements of environmental protection and safety in current urban construction, and also restrict the application of Larsen steel sheet pile in more complex and higher standard underground projects.

[0005] Therefore, how to retain the advantages of the Larsen steel sheet pile while improving its stress performance through technical improvement or process optimization has become an urgent issue in the field of underground engineering. SUMMARY

[0006] The anchor type support structure is characterized in that the anchor type support structure comprises a Larsen steel sheet pile, a steel sleeve arranged at the head of the Larsen steel sheet pile, a steel mesh connected to the steel sleeve, and a high-pressure rotary jet pile arranged at the inner side of the lower part of the Larsen steel sheet pile.

[0007] To achieve the above object, the anchor type support structure comprises a Larsen steel sheet pile, a steel sleeve arranged at the head of the Larsen steel sheet pile, a steel mesh connected to the steel sleeve, and a high-pressure rotary jet pile arranged at the inner side of the lower part of the Larsen steel sheet pile.

[0008] Preferably, the outer side of the anchor area roadbed is a non-anchor area roadbed.

[0009] Preferably, the hardening pavement is provided with a guardrail on the side close to the Larsen steel sheet pile.

[0010] Preferably, a brick retaining wall is arranged outside the guardrail.

[0011] Preferably, a foundation cushion layer is arranged above the high-pressure rotary jet pile.

[0012] Preferably, a flow state solidified soil layer is arranged above the foundation cushion layer.

[0013] Preferably, the Larsen steel sheet piles are arranged at intervals according to two lengths, and the heights of the heads of the Larsen steel sheet piles relative to the ground are staggered in a high-low mode.

[0014] Preferably, the steel sleeve is sleeved on the head of the Larsen steel sheet pile which is relatively higher relative to the ground.

[0015] Preferably, the steel mesh is a double-layer structure.

[0016] Preferably, the two layers of the steel mesh are connected by a diamond-shaped reinforcing bar.

[0017] Therefore, the anchor type support structure is adopted, the double-layer steel mesh is connected through the steel sleeve on the upper portion of the Larsen steel sheet pile based on the original Larsen steel sheet pile, the double-layer steel mesh is anchored in the roadbed, the railings and the brick masonry water retaining wall are arranged on the hardened pavement of the roadbed, the hardened pavement can be used for construction transportation, the double-layer steel mesh anchored in the roadbed is forced through the steel sleeve when the Larsen steel sheet pile is stressed, the deformation of the Larsen steel sheet pile is prevented, and the bending resistance of the Larsen steel sheet pile is improved; meanwhile, the high-pressure rotary jet pile is arranged on the inner side of the lower portion of the Larsen steel sheet pile, the foundation cushion layer and the fat groove backfill flow state solidified soil layer are arranged above the high-pressure rotary jet pile, the high-pressure rotary jet pile can provide a reverse force when the Larsen steel sheet pile is stressed, and the bending resistance of the Larsen steel sheet pile is further improved, the structure is suitable for the engineering with poor geological conditions, shallow excavation depth and narrow site, the deformation and displacement of the Larsen steel sheet pile in the working process are effectively reduced through the upper connection steel mesh and the lower high-pressure rotary jet pile, the construction requirements are met, the site utilization is maximized, the construction cost is reduced, and the structural safety is ensured.

[0018] The technical scheme of the present application is further described below with reference to the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a schematic diagram of an anchor type support structure of the present application;

[0020] Figure 2 is a schematic diagram of the fixed position of the steel mesh in the anchor type support structure of the present application;

[0021] Figure 3 is a schematic diagram of the fixed mode of the steel mesh in the anchor type support structure of the present application.

[0022] REFERENCE NUMERALS

[0023] 1, guardrail; 2, brick masonry water retaining wall; 3, hardened pavement; 4, non-anchored area roadbed; 5, anchored area roadbed; 6, dowel; 7, steel mesh; 8, steel sleeve; 9, Larsen steel sheet pile; 10, high-pressure rotary jet pile; 11, flow state solidified soil layer; 12, foundation cushion layer. DETAILED DESCRIPTION

[0024] The technical scheme of the present application is further described below with reference to the drawings and examples.

[0025] Unless otherwise defined, technical terms or scientific terms used in the present application shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms "first", "second", and the like, as used in the present application, do not denote any order, quantity, or importance, but are used to distinguish different components. The terms "include", "comprise", and the like, mean that the elements or objects before the terms encompass the elements or objects listed after the terms, and equivalents thereof, and do not exclude other elements or objects. The terms "connected", "coupled", and the like, do not limit to physical or mechanical connections or couplings, but can include electrical connections or couplings, whether direct or indirect. The terms "upper", "lower", "left", "right", and the like, are used only to indicate relative positions, and can change when the absolute positions of the described objects change.

[0026] Embodiment One

[0027] The present application provides an anchoring support structure, as shown in Figure 1 , which comprises Larsen steel sheet piles 9. In this embodiment, the Larsen steel sheet piles 9 are arranged at intervals of 9 m and 12 m, as shown in Figure 2 , Figure 3 The heights of the heads of the Larsen steel sheet piles 9 relative to the ground are staggered in a high-low manner, and in this embodiment, the heads of the higher Larsen steel sheet piles 9 are 250 mm higher than the heads of the lower Larsen steel sheet piles 9. The higher Larsen steel sheet piles 9 are used to connect the steel mesh 7, and the steel sleeve 8 is sleeved on the heads of the higher Larsen steel sheet piles 9.

[0028] The other side of the steel sleeve 8 is connected to the steel mesh 7, which is double-layered and bidirectional, and is anchored in the roadbed. When the steel mesh 7 is subjected to the tensile force transmitted by the Larsen steel sheet piles 9, the roadbed provides a counterforce to reduce the deformation of the steel mesh 7. A hardened pavement 3 is provided above the roadbed, which can be used as a construction pavement during operation. The part of the roadbed in which the steel mesh 7 is anchored is the anchoring area roadbed 5, and the part of the roadbed that is not anchored by the steel mesh 7 is the non-anchoring area roadbed 4. The two layers of steel mesh 7 are connected by the diamond-shaped dowels 6. In this embodiment, the diameters of the steel bars in the steel mesh 7 and the dowels 6 are both 8 mm, and the length of the lower layer of steel mesh 7 is 7 m.

[0029] The Larsen steel sheet piles 9 form a top reinforcement structure by connecting the double-layered steel mesh 7, and the overall rigidity of the top structure is enhanced by the bearing action of the roadbed.

[0030] A guardrail 1 is provided on the side of the hardened pavement 3 close to the Larsen steel sheet piles 9, and a brick retaining wall 2 is provided outside the guardrail 1. In this embodiment, the height of the guardrail 1 is 1200 mm.

[0031] The high-pressure rotary jet pile 10 is arranged at the inner side of the lower part of the Larsen steel sheet pile 9, and the width of the high-pressure rotary jet pile 10 is 700 mm and the height is 12 m in the example, a foundation cushion layer 12 is arranged on the high-pressure rotary jet pile 10, and a flow state solidified soil layer 11 is arranged in the fat groove above the foundation cushion layer 12, and the thickness of the flow state solidified soil layer 11 is at least 800 mm in the example. The Larsen steel sheet pile 9 is provided with lateral support by the high-pressure rotary jet pile 10 arranged at the lower part, and the bending resistance is further enhanced.

[0032] The anchor type supporting structure described in the embodiment has the following operation mode:

[0033] The Larsen steel sheet pile 9 is arranged at intervals of 9 m and 12 m, and the height between the head of the Larsen steel sheet pile 9 and the ground is arranged at intervals of high and low, wherein the higher Larsen steel sheet pile 9 is 250 mm higher than the lower Larsen steel sheet pile 9, and then the steel sleeve 8 is sleeved on the head of the higher Larsen steel sheet pile 9, so that the double-layer steel wire mesh 7 is connected with the Larsen steel sheet pile 9.

[0034] During construction, the double-layer steel wire mesh 7 is anchored in the roadbed poured by concrete, the hardened pavement 3 is laid on the roadbed, the guardrail 1 is arranged at the edge of the hardened pavement 3, and the brick masonry water retaining wall 2 is built.

[0035] The high-pressure rotary jet pile 10 is poured at the inner side of the lower part of the Larsen steel sheet pile 9, the foundation cushion layer 12 is arranged above the high-pressure rotary jet pile 10, and the flow state solidified soil layer 11 is laid in the fat groove.

[0036] Therefore, the anchor type supporting structure is adopted, the double-layer steel reinforcement mesh is connected on the upper part of the Larsen steel sheet pile through the steel sleeve on the basis of the original Larsen steel sheet pile, the double-layer steel reinforcement mesh is connected by the diamond-shaped reinforcing bar, the double-layer steel reinforcement mesh is anchored in the roadbed, the guardrail and the brick masonry water retaining wall are arranged on the hardened pavement on the roadbed, and the anchor type supporting structure can be used for construction and transportation. When the Larsen steel sheet pile is stressed, the double-layer steel reinforcement anchored in the roadbed applies force through the steel sleeve, so that the deformation of the Larsen steel sheet pile is prevented, and the bending resistance of the Larsen steel sheet pile is improved. Meanwhile, the high-pressure rotary jet pile is arranged at the inner side of the lower part of the Larsen steel sheet pile, the foundation cushion layer and the fat groove backfilled with the flow state solidified soil layer are laid above the high-pressure rotary jet pile, and the high-pressure rotary jet pile can provide a reverse force when the Larsen steel sheet pile is stressed, so that the bending resistance of the Larsen steel sheet pile is further enhanced. The structure is suitable for projects with poor geological conditions, shallow excavation depth and narrow site, the upper part is connected with the steel reinforcement mesh, and the lower part is poured with the high-pressure rotary jet pile, so that the deformation and displacement of the Larsen steel sheet pile in the working process are effectively reduced, the construction requirements are met, the site utilization is maximized, the construction cost is reduced, and the safety of the structure is ensured.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solutions of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. An anchored support structure, characterized in that: It includes a Larsen steel sheet pile, a steel sleeve is provided at the head of the Larsen steel sheet pile, the steel sleeve is connected to a steel mesh, the steel mesh is anchored to the roadbed in the anchoring area, a hardened road surface is provided above the roadbed in the anchoring area, and a high-pressure rotary jet pile is provided on the inner side of the lower part of the Larsen steel sheet pile.

2. The anchoring support structure according to claim 1, characterized in that: The outer side of the anchoring area roadbed is the non-anchoring area roadbed.

3. The anchoring support structure according to claim 1, characterized in that: A guardrail is provided on the side of the hardened road surface close to the Larsen steel sheet piles.

4. The anchoring support structure according to claim 3, characterized in that: A brick retaining wall is arranged outside the guardrail.

5. The anchoring support structure according to claim 1, characterized in that: A foundation cushion layer is arranged above the high-pressure jet grouting piles.

6. The anchoring support structure according to claim 5, characterized in that: A fluidized solidified soil layer is arranged above the foundation cushion layer.

7. The anchoring support structure according to claim 1, characterized in that: The Larsen steel sheet piles are arranged at intervals of two lengths, and the heights of the Larsen steel sheet pile heads relative to the ground are staggered in a manner of one high and one low.

8. The anchoring support structure according to claim 7, characterized in that: The steel sleeve is sleeved on the head of the Larsen steel sheet pile which is higher than the ground.

9. The anchoring support structure according to claim 1, characterized in that: The steel mesh has a double-layer structure.

10. The anchoring support structure according to claim 9, characterized in that: The two layers of the steel mesh are connected by diamond-shaped dowel bars.

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