CN217026767U - Existing culvert structure is striden on open cut tunnel - Google Patents

Abstract

The utility model discloses an existing culvert structure striding on an open cut tunnel, which comprises: an existing culvert is provided; the tunnel structure is obliquely arranged above the existing culvert; a plurality of pile foundations bearing the tunnel structure; protective structure, including putting sloping module and strutting the module, put the scope that sloping module and strutting the module cooperation injectd tunnel structure, put the sloping module and set up respectively in two crossing departments of tunnel structure and existing culvert, strut the module and set up all the other positions in the scope adjacent to each module of putting the slope. Through the local adoption put the slope module to enclose into the foundation ditch type with strutting the module cooperation, reduced the foundation ditch scale, have good control earth's surface deformability, through the vertical load that bears tunnel structure by the pile foundation, make existing culvert and newly-built tunnel respectively be independent atress system, avoided mutual influence between them, guarantee the safety of existing culvert and newly-built tunnel long-term service life after accomplishing.

Description

An existing culvert structure spanning the top of an open-cut tunnel

technical field

The utility model relates to the technical field of tunnel construction, in particular to an existing culvert structure spanning an open-cut tunnel.

Background technique

In the process of urban transportation construction, it is inevitable to encounter the situation that tunnels pass through existing underground culverts. In addition, the urban environment is complex, and there are sensitive structures, roads, pipelines, etc. in the surrounding area, which often become the difficulty and key point of project implementation. If the existing culverts are reconstructed, the construction process will be complicated, the engineering volume will be expanded, and the construction period will be prolonged.

Utility model content

The purpose of the present invention is to solve at least one of the technical problems existing in the prior art. Therefore, the utility model proposes an open-cut tunnel spanning the existing culvert structure, which can avoid the reconstruction of the existing culvert, the construction process is simple, does not affect the normal use function of the existing culvert, and ensures the existing culvert and the new construction. safety of the tunnel structure during construction and after completion.

According to the embodiment of the first aspect of the present utility model, the open-cut tunnel spanning the existing culvert structure includes:

existing culvert;

The tunnel structure is arranged above the existing culvert at intervals, and the tunnel structure and the existing culvert are arranged obliquely;

a plurality of pile foundations, bearing the tunnel structure, and each of the pile foundations and the existing culvert has a preset clear distance;

The protective structure includes a grading module and a supporting module, the grading module and the supporting module cooperate to define the scope of the tunnel structure, and the grading modules are respectively arranged in the tunnel structure and the existing culvert. At the two intersections of the grading modules, the support modules are arranged adjacent to the grading modules at the remaining positions within the range.

According to the first aspect of the present invention, the open-cut tunnel has an existing culvert structure spanning the upper span, and at least has the following beneficial effects: by partially adopting a grading module and cooperating with a supporting module to form a foundation pit type, it can ensure that during the construction period The normal function of the existing culvert avoids the reconstruction of the existing culvert, reduces the depth of the foundation pit, reduces the scale of the foundation pit, the excavation range is small, has a good ability to control the surface deformation, and reduces the impact on the surrounding sensitive structures. , roads, pipelines, etc., to ensure the safety of the surrounding environment during construction; the use of pile foundations to form an "underground bridge" type spans the existing culverts, and the pile foundations bear the vertical load of the tunnel structure, so that the existing culverts and Each of the new tunnels is an independent stress system, which avoids the mutual influence of the two and ensures the safety of the existing culverts and the new tunnels in the long-term use period after completion.

According to the existing culvert structure on the upper span of the open-cut tunnel according to the embodiment of the first aspect of the present utility model, the support module includes a water-stop curtain, a support pile and a crown beam arranged in sequence, and part of the support module The arrangement forms an opening protruding outward, and at least part of the grading module is disposed at the opening.

According to the embodiment of the first aspect of the present utility model, the open-cut tunnel spans an existing culvert structure, wherein the tunnel structure is provided with at least two buttresses arranged obliquely with the existing culvert and with the existing culvert. There are at least two diagonal braces arranged in parallel with the culvert, the opposite braces are connected to the support modules on both sides of the same grading module, and the diagonal braces are connected to the same side of the two grading modules. The support module enables each of the pair of braces and each of the diagonal braces to form a closed plane structure.

According to the embodiment of the first aspect of the present utility model, the upper span of the open-cut tunnel has an existing culvert structure, and the water-stop curtain adopts densely packed cement mixing piles.

According to the embodiment of the first aspect of the present utility model, the open-cut tunnel spans an existing culvert structure, the pile foundation is a cast-in-place pile, and at least part of the pile foundation is provided with a steel casing.

According to the embodiment of the first aspect of the present utility model, the open-cut tunnel spans an existing culvert structure, and a cushion is arranged between the pile foundation and the tunnel structure.

According to the embodiment of the first aspect of the present utility model, the open-cut tunnel spans an existing culvert structure, and the angle between the center line of the tunnel structure and the existing culvert is 75°.

According to the embodiment of the first aspect of the present utility model, the upper span of the open-cut tunnel has an existing culvert structure, and the concrete protection structure is between the grading module and the support module.

According to the embodiment of the first aspect of the present utility model, the open-cut tunnel spans an existing culvert structure, and the concrete protective structure is provided with a steel mesh or a hanging mesh.

Additional aspects and advantages of the invention will be set forth, in part, from the following description, and in part will be apparent from the following description, or learned by practice of the invention.

Description of drawings

Below in conjunction with accompanying drawing and embodiment, the utility model is further described;

Fig. 1 is the plan view of the utility model embodiment;

FIG. 2 is a cross-sectional view of an embodiment of the present utility model.

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, but should not be construed as a limitation of the present invention.

In the description of the present utility model, it should be understood that the orientation descriptions related to orientations, such as up, down, front, rear, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings, only It is for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

In the description of the present utility model, the meaning of several is one or more, the meaning of multiple is at least two, greater than, less than, exceeding, etc. are understood as not including this number, above, below, within, etc. are understood as including this number. If it is described that the first and the second are only for the purpose of distinguishing technical features, it cannot be understood as indicating or implying relative importance, or indicating the number of the indicated technical features or the order of the indicated technical features. relation.

In the description of the present invention, unless otherwise clearly defined, words such as setting, installation, connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution .

1 to 2 , the open-cut tunnel according to the first aspect of the present invention spans an existing culvert structure, including an existing culvert 2 , a tunnel structure 9 , several pile foundations 1 and a protective structure.

In some specific construction examples, the existing culvert 2 is a flood discharge culvert, the structural type is an arch culvert, and the geological conditions are mainly filled with soil, wherein the top and bottom plates are prefabricated reinforced concrete structures, and the side walls are stone masonry structures.

The tunnel structure 9 is arranged above the existing culvert 2 at intervals, and the tunnel structure 9 and the existing culvert 2 are arranged obliquely; in some specific construction embodiments, the tunnel structure 9 is a U-shaped groove structure, and the roof of the existing culvert 2 The clear distance between the structure and the bottom plate structure 8 of the tunnel structure 9 is about 1.5m, and the angle between the center line of the existing culvert 2 and the tunnel structure 9 is about 75°.

Among them, each pile foundation 1 is used to carry the tunnel structure 9, forming an "underground bridge" type that spans the existing culvert 2, and there is a preset clear distance between each pile foundation 1 and the existing culvert 2 to ensure that the two are independent of each other. Not affected; in some specific construction examples, the clear distance between the pile foundation 1 and the existing culvert 2 is ≥1m.

The protective structure includes a grading module 11 and a supporting module. The grading module 11 and the supporting module cooperate to define the range of the tunnel structure 9 . The grading modules 11 are respectively arranged at the intersections of the tunnel structure 9 and the existing culvert 2 . where the support modules are adjacent to the grading modules 11 at the remaining positions within the range. It can be understood that the protective structure is used to withstand the main horizontal earth pressure or landslide thrust, but the top of the existing culvert 2 cannot be used as a supporting pile 5. Therefore, at the two intersections of the tunnel structure 9 and the existing culvert 2, that is, there are The top of the culvert adopts a partial arrangement of grading, and the other areas are supported by the supporting piles 5 to bear the lateral thrust, so as to ensure the normal construction of the tunnel structure 9 without affecting the existing culvert 2.

By partially adopting the grading module 11 and cooperating with the supporting module to form the type of foundation pit, the normal function of the existing culvert 2 can be ensured during construction, the reconstruction of the existing culvert 2 is avoided, the depth of the foundation pit is reduced, and the The scale of the foundation pit is reduced, the excavation range is small, and it has a good ability to control the surface deformation, reducing the impact on the surrounding sensitive structures, roads, pipelines, etc., and ensuring the safety of the surrounding environment during construction; The type of "underground bridge" spans the existing culvert 2, and the pile foundation 1 bears the vertical load of the tunnel structure 9, so that the existing culvert 2 and the new tunnel are independent stress systems, avoiding the mutual influence of the two, ensuring The safety of the existing culvert 2 and the new tunnel in the long-term use period after completion.

In some embodiments of the present invention, the support module includes a water-stop curtain 4, a support pile 5 and a crown beam 7 which are arranged in sequence, and some of the support modules are arranged to form outwardly protruding openings. at least partially disposed at the opening. It can be understood that the water-stop curtain 4 and the supporting piles 5 are arranged in sequence from the outside to the inside, and the crown beam 7 is used for supporting, distributing and transmitting the load, connecting all the supporting piles 5 together, preventing the top edge of the foundation pit. produce collapse. It can be understood that it is better to use cast-in-place piles for the supporting piles 5 .

In some embodiments of the present invention, the support module further includes at least two diagonal braces arranged obliquely with the existing culvert 2 and at least two diagonal braces arranged parallel to the existing culvert 2 , and the opposite braces are connected to the same The support modules on both sides of the slope module 11 are connected to the support modules on the same side of the two grading modules 11, so that each pair of supports and each diagonal support form a closed plane structure. Combined with the special-shaped protective structure, the inner support 6 is provided to ensure the safety of construction, and after the overall assembly is completed, it is welded and connected to the embedded parts in the crown beam 7 .

In some embodiments of the present invention, the concrete protection structure between the grading module 11 and the supporting module prevents the slope from being weathered and eroded from the surface to the inside and washed by rainfall. Among them, there are steel mesh or hanging mesh in the concrete protective structure, and the construction method of hanging mesh shotcrete through the slope is more effective.

Referring to FIGS. 1 to 2 , a construction method for an open-cut tunnel spanning an existing culvert structure according to a second aspect of the present invention includes the following steps:

S1: According to the position of the existing culvert 2, confirm the relative positional relationship between the tunnel structure 9 and the existing culvert 2, the site is leveled, and the pile foundation 1 of the tunnel structure 9 is constructed, and reliable measures are taken during the construction process to ensure the existing Safety of culvert 2, there is a preset clear distance between pile foundation 1 and existing culvert 2;

S2: carry out the construction of the water-stop curtain 4 of the foundation pit;

S3: Carry out the construction of the supporting piles 5 of the foundation pit, in which local excavation and grading are carried out in the longitudinal overlapping position of the tunnel structure 9 and the existing culvert 2. According to the position of the grading, the overlapping of the tunnel structure 9 and the existing culvert 2 The support piles 5 are set outside the location range, and the construction scope of the tunnel structure 9 is defined by the grading position and the support piles 5. The center distance of the adjacent support piles 5 should be less than 2D and the clear distance between the support piles 5 should not be greater than 1.0m.

S4: In combination with the special-shaped distribution of the supporting piles 5 on the plane, the crown beam 7 and the inner support 6 of the foundation pit are constructed;

S5: Carry out the excavation of the foundation pit, and the earthwork excavation shall start after the protective structure of the foundation pit reaches the design strength;

S6: Carry out the construction and backfilling of the tunnel structure 9 .

Further, the interaction between the tunnel structure 9 and the existing culvert 2 can also be analyzed before S1. According to the spatial relationship between the open-cut tunnel structure 9 and the existing culvert 2, combined with the structural type of the existing culvert 2, it is estimated that the According to the mutual influence of construction period and the use period after completion, a feasible construction method is proposed.

By partially adopting grading construction, and setting supporting piles 5 and inner supports 6 according to the grading position, the three cooperate to form a foundation pit, which can ensure the normal function of the existing culvert 2 during the construction period, and avoid the need for damage to the existing culvert 2. The renovation has reduced the depth of the foundation pit, reduced the scale of the foundation pit, the excavation range is small, and has a good ability to control the surface deformation, reducing the impact on the surrounding sensitive structures, roads, pipelines, etc. Environmental safety; by using pile foundation 1 to form an "underground bridge", the existing culvert 2 is spanned, and the pile foundation 1 bears the vertical load of the tunnel structure 9, so that the existing culvert 2 and the new tunnel are independently stressed The system avoids the mutual influence of the two and ensures the safety of the existing culvert 2 and the new tunnel in the long-term use period after completion.

In some embodiments of the present invention, in S1, the pile foundation 1 is a cast-in-place pile, at least part of the pile foundation 1 is provided with a steel casing 3, and at least part of the pile foundation 1 uses the steel casing 3 to assist in forming holes. Existing culvert 2 for protection.

In some embodiments of the present invention, in S2, the water-stop curtain 4 adopts densely packed cement mixing piles, and the water-stop curtain 4 passes through the permeable layer and enters a preset depth below the bottom of the foundation pit, so as to prevent or reduce the side of the foundation pit. The groundwater from the walls and the bottom of the foundation pit flows into the foundation pit.

In some embodiments of the present invention, in S3, water-stop curtains 4 and supporting piles 5 are respectively provided on both sides of the grading position, and are respectively connected to the tunnel structure 9 and the existing culvert 2 outside the overlapping position range The water-stop curtain 4 and the supporting piles 5 are arranged to form a whole. It can be understood that the grading position can be connected with the supporting pile 5 to form a continuous supporting structure, so as to achieve the effect of being able to withstand lateral thrust. In this regard, in order to ensure that both sides of the grading position also have a certain protective function, additional water-stop curtains 4 and supporting piles 5 are added on both sides of the grading position to ensure comprehensive protection.

In some embodiments of the present invention, in S4, the top of the support pile 5 is reserved with steel bars anchored into the crown beam 7, and the inner support 6 includes a pair of supports perpendicular to the existing culvert 2 and a diagonal support parallel to the existing culvert 2. The braces, diagonal braces and counter braces are respectively connected to part of the crown beam 7 to ensure the quality of the foundation pit.

In some embodiments of the present invention, in S5, before excavation, the ground around the boundary of the foundation pit is hardened and a drainage ditch is set up, the foundation pit is constructed by the excavation method, and the excavation is symmetrical layer by layer, and the foundation pit is excavated to the distance from the bottom of the pit. When the diameter is 300mm, manual excavation must be used to avoid over-excavation of the foundation pit. After excavation to the bottom of the foundation pit, a closed cushion layer 10 is laid. The timely construction of slope and inter-pillar protection can ensure construction safety.

In some embodiments of the present invention, in S6, the bottom plate waterproofing of the tunnel structure 9, the bottom plate structure 8, the backfilling plain concrete on both sides of the bottom plate, the side wall structure, and the side wall waterproofing are performed in sequence, and the side wall is applied after the structure reaches the design strength. Stone chips are backfilled on both sides, and steel bars with a preset length are reserved at the top of the pile foundation 1 for anchoring into the bottom plate structure 8 of the tunnel structure 9. Preferably, the reserved length is greater than or equal to 30d. Ensure a reliable connection between the two.

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, all It should be considered as the range described in this specification.

The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings, but the present utility model is not limited to the above-mentioned embodiments, and within the scope of knowledge possessed by those of ordinary skill in the technical field, the present utility model can also be used without departing from the purpose of the present utility model. make various changes.

Claims (10)

1. The utility model provides an existing culvert structure is striden on open cut tunnel which characterized in that includes:

the existing culvert is available;

the tunnel structures are arranged above the existing culvert at intervals, and the tunnel structures and the existing culvert are obliquely arranged;

the pile foundations bear the tunnel structure, and a preset clear distance is reserved between each pile foundation and the existing culvert;

the protective structure comprises a slope releasing module and a supporting module, wherein the slope releasing module and the supporting module are matched to limit the range of the tunnel structure, the slope releasing module is arranged at two crossed positions of the tunnel structure and the existing culvert respectively, and the supporting module is adjacent to each slope releasing module and is arranged at other positions in the range.

2. The open-cut tunnel over-existing culvert structure of claim 1, characterized in that: the supporting module comprises a waterproof curtain, supporting piles and a crown beam which are sequentially arranged, part of the supporting module is arranged to form an opening protruding outwards, and at least part of the slope-releasing module is arranged at the opening.

3. The open-cut tunnel according to claim 2, wherein the existing culvert structure is spanned on the open-cut tunnel, and the culvert structure is characterized in that: the supporting module further comprises at least two diagonal supports arranged in an oblique crossing manner with the existing culvert and at least two diagonal supports arranged in parallel with the existing culvert, the diagonal supports are connected to the supporting modules on two sides in the same slope-releasing module, and the diagonal supports are connected to the supporting modules on the same side in the two slope-releasing modules, so that the diagonal supports and the diagonal supports enclose a closed plane structure.

4. The open-cut tunnel according to claim 2, wherein the existing culvert structure is spanned on the open-cut tunnel, and the culvert structure is characterized in that: the waterproof curtain adopts closely-arranged cement mixing piles.

5. The open-cut tunnel over-existing culvert structure of claim 1, characterized in that: the pile foundation adopts bored concrete pile, at least part be equipped with the steel on the pile foundation and protect a section of thick bamboo.

6. The open-cut tunnel over-existing culvert structure of claim 1, characterized in that: and a cushion layer is arranged between the pile foundation and the tunnel structure.

7. The open-cut tunnel according to claim 1, wherein the existing culvert structure is spanned thereon, and the culvert structure is characterized in that: the included angle between the central line of the tunnel structure and the existing culvert is 75 degrees.

8. The open-cut tunnel over-existing culvert structure of claim 1, characterized in that: the tunnel structure is a U-shaped groove structure.

9. The open-cut tunnel over-existing culvert structure of claim 1, characterized in that: the slope-caving module and the concrete protection structure between the supporting modules.

10. The open-cut tunnel over-existing culvert structure of claim 9, wherein: and a reinforcing mesh or a hanging mesh is arranged in the concrete protection structure.

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