Composite foundation structure for splicing new roadbed and old roadbed

Abstract

The utility model discloses a composite foundation structure for splicing a new roadbed and an old roadbed, which belongs to the technical field of road roadbeds, solves the problem of differential settlement during reconstruction and extension of the existing road and splicing of the new roadbed and the old roadbed, and comprises an extension roadbed, the extension roadbed comprises a polymer filler layer, and a plurality of steel bar pouring layers are laid in the polymer filler layer. One end of the multi-layer steel bar pouring layer is inserted into the old roadbed, the other end of the multi-layer steel bar pouring layer is laid in the polymer filler layer to splice the old roadbed and the extended roadbed, and a plurality of supporting mechanisms for supporting the polymer filler layer are uniformly arranged below the bottom of the polymer filler layer; when the old roadbed and the extension roadbed are spliced through the multiple steel bar pouring layers, the strength of the joint of the old roadbed and the extension roadbed is enhanced, meanwhile, the extension roadbed is supported through the supporting mechanism, settlement of the extension roadbed is reduced, and therefore differential settlement occurring in splicing of the old roadbed and the extension roadbed is effectively controlled.

Description

Technical Field

[0001] The utility model relates to the technical field of road subgrade, in particular to a composite foundation structure used for splicing new and old subgrades. Background Art

[0002] At present, many roads in coastal areas are built on soft soil foundations. Since soft soil has the characteristics of high water content, low shear strength and high compressibility, and the roads under reconstruction and expansion are mainly subjected to heavy vehicle loads such as trucks and trailers during the operation period, the "heavy vehicle side" traffic mode causes the widened part of the roadbed to bear excessive loads and high load frequency. The complex road conditions and long-term heavy loads will greatly aggravate the uneven settlement of the roadbed structure caused by the differences between the new and old roadbeds. Solving the problem of differential settlement between the new and old roadbeds is the key.

[0003] The main reasons for the differential settlement between the new and old roadbeds are:

[0004] (1) Differential deformation of foundation consolidation between the new and old roadbeds: Due to the special engineering properties of soft soil, the foundation soil under the new roadbed takes a long time to consolidate and has high compressibility. In addition, the settlement deformation is still large after the construction is completed. However, the foundation soil under the old roadbed has basically completed the consolidation deformation under the action of the deadweight load of the old roadbed and the vehicle load after the road is opened to traffic. This will cause uneven settlement of the surface and damage the roadbed structure.

[0005] (2) Insufficient strength of the junction of the new and old roadbeds: The junction of the new and old roadbeds is the weakest part of the widened roadbed. The new roadbed slips along the junction surface, which may cause differential and uneven settlement and overall instability, and damage the roadbed at the junction of the new and old roadbeds. The interface friction between the new and old roadbeds can be increased to form an integrated force system.

[0006] (3) Compression deformation of new roadbed: The new roadbed will produce settlement deformation under the action of its own gravity. Selecting lightweight roadbed fillers can reduce its own compression deformation. Utility Model Content

[0007] In view of the above problems in the prior art, the utility model provides a composite foundation structure for splicing new and old roadbeds, which solves the problem of differential settlement when splicing new and old roadbeds during reconstruction and expansion of existing roads.

[0008] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0009] A composite foundation structure for splicing a new roadbed with an old one is provided, which comprises an expanded roadbed. The expanded roadbed comprises a polymer filler layer, in which a multi-layer steel casting layer is laid, one end of the multi-layer steel casting layer is inserted into the old roadbed, and the other end of the multi-layer steel casting layer is laid in the polymer filler layer to splice the old roadbed with the expanded roadbed, and a plurality of support mechanisms for supporting the polymer filler layer are evenly arranged below the bottom of the polymer filler layer.

[0010] The utility model strengthens the strength of the junction of the old roadbed and the expanded roadbed by using a multi-layer steel bar casting layer when splicing the old roadbed and the expanded roadbed, and at the same time provides support for the expanded roadbed through a supporting mechanism to reduce the settlement of the expanded roadbed, thereby effectively controlling the differential settlement of the splicing of the old roadbed and the expanded roadbed.

[0011] Furthermore, the joint cut between the old roadbed and the expanded roadbed is inclined.

[0012] Furthermore, each steel bar casting layer includes a plurality of casting steel bars, and the casting steel bars include a connected front steel bar section and a rear steel bar section, and the front steel bar section and the rear steel bar section form an angle;

[0013] The front section of the steel bar is inserted into the old roadbed, the rear section of the steel bar is laid in the polymer filler layer, and concrete is poured in both the front section of the steel bar and the rear section of the steel bar.

[0014] Furthermore, a plurality of reinforcing plates are arranged at intervals on the front section and the rear section of the steel bar.

[0015] Furthermore, the supporting mechanism includes a T-shaped through hole opened on the foundation platform, and a supporting pile is placed in the through hole.

[0016] Furthermore, the supporting pile comprises a hollow pile body, the hollow interior of the pile body is filled with aggregate; and a pile cap is arranged on the top of the pile body.

[0017] Furthermore, a connecting assembly connecting the pile body and the pile cap is arranged in the hollow of the pile body.

[0018] Furthermore, the connection assembly includes a lower supporting plate arranged in the hollow of the pile body, and four studs are evenly arranged on the lower supporting plate. The four studs pass through the pile cap and are fixed by nuts.

[0019] Furthermore, a crushed stone cushion layer is provided between the polymer filler layer and the supporting mechanism.

[0020] The utility model discloses a composite foundation structure for splicing new and old roadbeds, and its beneficial effects are:

[0021] The utility model strengthens the strength of the junction of the old roadbed and the expanded roadbed by using a multi-layer steel bar casting layer when splicing the old roadbed and the expanded roadbed, and at the same time provides support for the expanded roadbed through a supporting mechanism to reduce the settlement of the expanded roadbed, thereby effectively controlling the differential settlement of the splicing of the old roadbed and the expanded roadbed. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The utility model is a structural schematic diagram of a composite foundation structure used for splicing new and old roadbeds.

[0023] Figure 2 It is a structural schematic diagram of the cast steel bar of the utility model.

[0024] Figure 3 It is a structural schematic diagram of the support mechanism of the utility model.

[0025] Figure 4 It is a structural schematic diagram of the connection component of the utility model.

[0026] Among them, 1. old roadbed; 2. expanded roadbed; 3. polymer filler layer; 4. steel casting layer; 41. cast steel bars; 42. front section of steel bars; 43. rear section of steel bars; 44. reinforcement plate; 5. supporting mechanism; 51. through hole; 52. supporting pile; 53. pile body; 54. pile cap; 55. connection assembly; 551. lower support plate; 552. stud; 6. gravel cushion layer. DETAILED DESCRIPTION

[0027] The specific implementation modes of the present invention are described to facilitate the understanding of the present invention by those skilled in the art. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those skilled in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all utility model creations utilizing the concept of the present invention are protected.

[0028] Example 1

[0029] refer to Figure 1 and Figure 2 , which is a structural schematic diagram of a composite foundation structure for splicing new and old roadbeds in this embodiment, and its purpose is to solve the problem of differential settlement when splicing new and old roadbeds during the reconstruction and expansion of existing roads. The specific structure in this embodiment will be described in detail below.

[0030] A composite foundation structure for splicing new and old roadbeds comprises an expanded roadbed 2, wherein the expanded roadbed 2 comprises a polymer filler layer 3, and multiple layers of steel bar casting layers 4 are laid in the polymer filler layer 3.

[0031] Specifically, one end of the multi-layer steel casting layer 4 is inserted into the old road subgrade 1, and the other end of the multi-layer steel casting layer 4 is laid in the polymer filler layer 3 to splice the old road subgrade 1 and the expanded subgrade 2, and a number of supporting mechanisms 5 for supporting the polymer filler layer 3 are evenly arranged under the bottom of the polymer filler layer 3.

[0032] In this embodiment, when the old roadbed 1 and the expanded roadbed 2 are spliced, a plurality of support mechanisms 5 are evenly arranged below the bottom of the polymer filler layer 3 to provide support to the expanded roadbed 2 and reduce settlement of the expanded roadbed 2.

[0033] The polymer filler layer 3 is made of foam polymer lightweight soil, which has the characteristics of light weight and high strength, thereby reducing the compression deformation caused by its own weight. When laying, the polymer filler layer 3 is laid in layers. After laying a layer of foam polymer lightweight soil, a layer of steel casting layer 4 is laid. One end of the steel casting layer 4 is inserted in the old road subgrade 1, and the other end of the steel casting layer 4 is laid in the polymer filler layer 3 to splice the old road subgrade 1 and the expanded subgrade 2, strengthen the strength of the joint between the old road subgrade 1 and the expanded subgrade 2, thereby effectively controlling the differential settlement of the old road subgrade 1 and the expanded subgrade 2 at the joint.

[0034] Specifically, the joint cut between the old roadbed 1 and the expanded roadbed 2 is inclined.

[0035] In this embodiment, the splicing cut of the old road subgrade 1 and the expanded roadbed 2 is inclined. The inclined splicing cut can strengthen the strength of the splicing of the old road subgrade 1 and the expanded roadbed 2, further reducing the possibility of differential settlement of the splicing of the old road subgrade 1 and the expanded roadbed 2.

[0036] Specifically, a crushed stone cushion layer 6 is provided between the polymer filler layer 3 and the supporting mechanism 5 .

[0037] In this embodiment, the gravel cushion layer 6 is made of graded gravel and is laid flat. In the width direction, one side is connected to the old roadbed 1, and the other side extends to the edge of the expanded roadbed 2. In the road surface extension direction, the graded gravel extends to both ends of the expanded roadbed 2, with a thickness of 30 cm. The gravel cushion layer 6 is used to adjust the pile-soil stress ratio and give full play to the interaction between the pile and the soil.

[0038] Specifically, each layer of cast steel bars 4 includes a plurality of cast steel bars 41, and the cast steel bars 41 include a connected front steel bar section 42 and a rear steel bar section 43, and the front steel bar section 42 and the rear steel bar section 43 form an angle, the front steel bar section 42 is inserted in the old roadbed 1, and the rear steel bar section 43 is laid in the polymer filler layer 3, and concrete is poured in both the front steel bar section 42 and the rear steel bar section 43.

[0039] In this embodiment, after laying a layer of foam polymer lightweight soil, a plurality of casting steel bars 41 are laid to form a steel casting layer 4. The casting steel bars 41 are a plurality of threaded steel bars fixed to form a cylindrical structure.

[0040] The front section 42 and the rear section 43 of the cast steel bar 41 form an angle, and the size of the angle can be set according to actual needs. After the front section 42 of the steel bar is inserted into the old road subgrade 1 and the rear section 43 of the steel bar is laid in the polymer filler layer 3, concrete is poured in the front section 42 and the rear section 43 of the steel bar, so that the old road subgrade 1 and the expanded roadbed 2 are connected by the cast steel bar 41 after pouring, thereby strengthening the strength of the junction between the old road subgrade 1 and the expanded roadbed 2.

[0041] Specifically, a plurality of reinforcing plates 44 are disposed at intervals on the front section 42 and the rear section 43 of the steel bar.

[0042] In this embodiment, a plurality of reinforcing plates 44 are arranged at intervals on the front section 42 and the rear section 43 of the steel bar. The reinforcing plates 44 can be welded and fixed to the front section 42 or the rear section 43 of the steel bar. The reinforcing plates 44 can fix the plurality of cylindrical threaded steel bars on the one hand, and can further improve the connection effect of the cast steel bars 41 on the other hand.

[0043] Example 2

[0044] refer to Figure 3 and Figure 4 , is a structural schematic diagram of a composite foundation structure for splicing new and old roadbeds in this embodiment, and its purpose is to solve the problem of differential settlement of new and old roadbeds during reconstruction and expansion of existing roads. Based on Example 1, this embodiment provides a further solution for the support mechanism 5. The specific structure of the support mechanism 5 in this embodiment will be described in detail below.

[0045] The supporting mechanism 5 comprises a T-shaped through hole 51 opened on the foundation platform, and a supporting pile 52 is placed in the through hole 51 .

[0046] Specifically, the supporting pile 52 includes a hollow pile body 53 , the hollow interior of the pile body 53 is filled with aggregate; a pile cap 54 is disposed on the top of the pile body 53 .

[0047] In this embodiment, a T-shaped through hole 51 is opened on the foundation platform, and the diameter of the through hole 51 matches the diameter of the pile body 53. The pile body 53 is placed in the through hole 51, and a pile cap 54 is provided on the top of the pile body 53 to support the expanded roadbed 2.

[0048] Specifically, a connecting assembly 55 connecting the pile body 53 and the pile cap 54 is arranged in the hollow of the pile body 53, and the connecting assembly 55 includes a lower supporting plate 551 arranged in the hollow of the pile body 53, and four studs 552 are evenly arranged on the lower supporting plate 551. The four studs 552 pass through the pile cap 54 and are fixed by nuts.

[0049] In this embodiment, a connecting assembly 55 is provided in the hollow of the pile body 53, and the connecting assembly 55 includes a lower supporting plate 551. After the lower supporting plate 551 is placed in the hollow of the pile body 53, the hollow of the pile body 53 is poured with aggregate, and the material of the pile body 53 and the pile cap 54 is the same as the material of the poured aggregate, both of which are soil cementite solidified recycled aggregate. While soil cementite has the same performance as traditional cement, its economic and environmental benefits are very significant. At the same time, the use of recycled aggregate can effectively reduce the use of crushed stone.

[0050] Then, the pile cap 54 is placed on the top of the pile body 53 , and the four studs 552 on the lower supporting plate 551 pass through the through holes reserved in the pile cap 54 . Finally, the pile cap 54 is fixed on the top of the pile body 53 by nuts.

[0051] The working principle of a composite foundation structure used for splicing new and old roadbeds in this scheme is:

[0052] In practical application, the utility model refers to Figure 1-Figure 4 When splicing the old roadbed 1 and the expanded roadbed 2, first, a plurality of T-shaped through holes 51 are evenly arranged below the bottom of the polymer filler layer 3 of the expanded roadbed 2. The through holes 51 are arranged in squares with equal intervals. Support piles 52 are placed in the through holes 51 to complete the construction of the support mechanism 5. The support mechanism 5 provides support for the expanded roadbed 2 to reduce the settlement of the expanded roadbed 2.

[0053] Then, graded crushed stone is used above the supporting mechanism 5 and a crushed stone cushion layer 6 is laid flat. In the width direction, one side is connected to the old roadbed 1, and the other side extends to the edge of the expanded roadbed 2. In the road surface extension direction, the graded crushed stone extends to both ends of the expanded roadbed 2 with a thickness of 30 cm. The pile-soil stress ratio is adjusted through the crushed stone cushion layer 6 and the interaction between the pile and the soil is fully utilized.

[0054] Finally, the foam polymer lightweight soil is filled layer by layer to form a polymer filler layer 3, and the steel casting layer 4 is laid inside when filling the polymer filler layer 3, and one end of the steel casting layer 4 is inserted into the old road subgrade 1, and the other end of the steel casting layer 4 is laid in the polymer filler layer 3 to splice the old road subgrade 1 and the expanded roadbed 2, thereby strengthening the strength of the joint between the old road subgrade 1 and the expanded roadbed 2, thereby effectively controlling the differential settlement of the old road subgrade 1 and the expanded roadbed 2 at the joint.

[0055] Although the specific implementation of the utility model is described in detail in conjunction with the drawings, it should not be understood as limiting the scope of protection of this patent. Within the scope described in the claims, various modifications and variations that can be made by those skilled in the art without creative work still fall within the scope of protection of this patent.

Claims

1. A composite foundation structure for splicing new and old roadbeds, characterized in that: Includes expansion of roadbed (2); The expanded roadbed (2) comprises a polymer filler layer (3), and multiple layers of steel bar casting layers (4) are laid in the polymer filler layer (3); One end of the multiple layers of the steel bar casting layer (4) is inserted into the old roadbed (1), and the other end of the multiple layers of the steel bar casting layer (4) is laid in the polymer filler layer (3) to splice the old roadbed (1) and the expanded roadbed (2); A plurality of support mechanisms (5) for supporting the polymer filler layer (3) are evenly arranged below the bottom of the polymer filler layer (3).

2. The composite foundation structure for splicing new and old roadbeds according to claim 1 is characterized in that: The splicing cuts of the old roadbed (1) and the expanded roadbed (2) are inclined.

3. The composite foundation structure for splicing new and old roadbeds according to claim 1 is characterized in that: Each of the steel casting layers (4) comprises a plurality of casting steel bars (41), wherein the casting steel bars (41) comprise a connected front steel bar section (42) and a rear steel bar section (43), and the front steel bar section (42) and the rear steel bar section (43) form an angle; The front section of the steel bar (42) is inserted into the old roadbed (1), the rear section of the steel bar (43) is laid in the polymer filler layer (3), and concrete is poured in both the front section of the steel bar (42) and the rear section of the steel bar (43).

4. The composite foundation structure for splicing new and old roadbeds according to claim 3 is characterized in that: A plurality of reinforcing plates (44) are arranged at intervals on the front section (42) and the rear section (43) of the steel bar.

5. The composite foundation structure for splicing new and old roadbeds according to claim 1 is characterized in that: The support mechanism (5) comprises a T-shaped through hole (51) opened on the foundation platform, and a support pile (52) is placed in the through hole (51).

6. The composite foundation structure for splicing new and old roadbeds according to claim 5 is characterized in that: The supporting pile (52) comprises a hollow pile body (53), wherein the hollow of the pile body (53) is filled with aggregate; and a pile cap (54) is arranged on the top of the pile body (53).

7. The composite foundation structure for splicing new and old roadbeds according to claim 6 is characterized in that: A connecting assembly (55) for connecting the pile body (53) and the pile cap (54) is arranged in the hollow of the pile body (53).

8. The composite foundation structure for splicing new and old roadbeds according to claim 7 is characterized in that: The connection assembly (55) comprises a lower support plate (551) arranged in the hollow of the pile body (53), and four studs (552) are evenly arranged on the lower support plate (551). The four studs (552) pass through the pile cap (54) and are fixed by nuts.

9. The composite foundation structure for splicing new and old roadbeds according to claim 1 is characterized in that: A crushed stone cushion layer (6) is provided between the polymer filler layer (3) and the supporting structure (5).

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