CN215718794U

CN215718794U - Bridge-lining combined structure with tunnel inner crossing function

Info

Publication number: CN215718794U
Application number: CN202122096510.1U
Authority: CN
Inventors: 幸芊; 洪兆远; 杨春; 张勇; 龚贵友
Original assignee: CMCU Engineering Co Ltd
Current assignee: CMCU Engineering Co Ltd
Priority date: 2021-09-01
Filing date: 2021-09-01
Publication date: 2022-02-01
Anticipated expiration: 2031-09-01

Abstract

The utility model relates to a bridge-lining combined structure with a tunnel internal crossing function, and belongs to the field of bridge and tunnel structures. The both sides of decking below width direction are fixed with the support longeron respectively, the lower terminal surface of decking is fixed with the supporting beam of horizontal setting, the even interval of supporting beam sets up, the both ends of supporting beam pass the support longeron respectively after as an organic whole with the first steelframe rigid coupling of tunnel in the tunnel, the inboard of the first steelframe of tunnel is tunnel secondary lining, tunnel secondary lining's horizontal reinforcing bar anchor is gone into in the support longeron, tip supporting beam is located the both ends that need to stride across the space in the tunnel, tip supporting beam consolidates integratively with the support longeron, the support longeron is to the certain length of non-bridge span section extension in the tunnel of both ends and place on the country rock, the tunnel pile foundation in the tunnel sets up at tip supporting beam and support longeron cross position. The whole bridge span system and the tunnel lining system of the structure are organically combined, and the structure has higher rigidity and stability than the traditional bridge structure in the tunnel.

Description

Bridge-lining combined structure with tunnel inner crossing function

Technical Field

The utility model belongs to the technical field of tunnel engineering and structural engineering, and relates to a bridge-lining combined structure with a tunnel internal crossing function.

Background

Tunneling sometimes involves crossing structures (e.g., other tunnels) or crossing particular obstacles (e.g., underground caverns) at close distances. In this case, a bridge structure is generally installed in the tunnel to span these obstacles, and the conventional bridge structure in the tunnel has the following problems:

1. if the longitudinal length of the space spanned by the tunnel exceeds the width of the cross section of the tunnel, the load of the tunnel lining is completely transmitted to the bridge structure, so that the beam close to the arch foot part of the tunnel lining is greatly stressed, the beam far away from the tunnel lining in the middle only bears the load of an automobile, the load of the whole structure is unevenly distributed, and the stress is unreasonable;

2. when the span required by the bridge in the tunnel is large, the load transmitted to the bridge by the tunnel lining is large, and the traditional bridge structure adopts a simple supporting beam or a simple supporting plate, needs a large section and reinforcing bars and is high in manufacturing cost;

3. the pile foundation in the tunnel bears great load at the position close to the tunnel lining arch springing, and the pile foundation in the middle far away from the tunnel lining only bears the automobile load. Load distribution is very inhomogeneous, and the basis atress is unreasonable, needs very big cushion cap just can distribute the load, and the pile foundation that needs is more, and some pile foundation atress is less again, causes very big engineering waste.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention is directed to a bridge-lining combined structure with an intra-tunnel crossing function, which is used for an underground tunnel with a crossing requirement in a tunnel.

In order to achieve the purpose, the utility model provides the following technical scheme:

bridge-lining united structure with cross function in tunnel, including the decking, the both sides of decking below width direction are fixed with the support longeron respectively, the lower terminal surface of decking is fixed with the supporting beam of a plurality of horizontal settings, the even interval of supporting beam sets up, the both ends of supporting beam pass respectively and support the longeron after as an organic whole with the tunnel primary frame rigid coupling in the tunnel, the inboard of tunnel primary frame is tunnel secondary lining, tunnel secondary lining's horizontal reinforcing bar anchor is gone into in supporting the longeron, tip supporting beam is located the both ends that need to stride across the space in the tunnel, tip supporting beam consolidates integratively with the support longeron, tunnel pile foundation in the tunnel sets up at tip supporting beam and support longeron cross position.

Furthermore, the support longitudinal beams extend to the non-bridge span sections in the tunnels at the bottoms of the tunnels at two sides and are supported on the surrounding rocks.

Furthermore, the length of the support longitudinal beam extending into the rock mass at the bottom of the tunnel at two sides is 0.6B, and B is a span needing to span a space.

Furthermore, the space between the supporting cross beams corresponds to the space between the primary tunnel support steel frames, and the space between the supporting cross beams is an integral multiple of the space between the primary tunnel support steel frames.

The utility model has the beneficial effects that:

1. the main stress structure support longitudinal beam of the bridge span system and the tunnel secondary lining are connected into a whole, so that the rigidity and the bearing capacity of the support longitudinal beam are greatly improved, and the problems that the traditional bridge structure in the tunnel adopts an independent bridge structure, is unreasonable in stress, needs a larger cross section and reinforcing bars, is difficult to implement and has higher cost are solved;

2. the supporting cross beams and the tunnel primary support steel frame are connected into a whole, so that the whole bridge span structure can be locked on surrounding rocks by means of tunnel foot locking anchor rods and system anchor rods on tunnel lining, the stress of the bridge span structure is further improved, and the problems of insufficient rigidity and bearing capacity when the traditional bridge structure in the tunnel is subjected to load transmitted by a larger lining are solved;

3. the supporting longitudinal beams are extended to the two ends, so that the elastic foundation beams on the two sides and the tunnel pile foundation bear load together, the load of the pile foundation is greatly reduced, the stress of the pile foundation is improved, and the problems that the traditional bridge structure in the tunnel can meet the requirement of bearing capacity only by adopting a large number of pile foundations, the stress between pile foundations is very uneven, and great engineering waste exists are solved;

4. the whole bridge span system is organically combined with the tunnel lining system, so that the bridge structure has higher rigidity and stability than the traditional bridge structure in the tunnel, and the economy is greatly improved.

Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model. The objectives and other advantages of the utility model may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.

Drawings

For the purposes of promoting a better understanding of the objects, aspects and advantages of the utility model, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic cross-sectional structure of the present invention;

FIG. 2 is a top view of the present invention;

fig. 3 is a schematic longitudinal sectional structure of the present invention.

Reference numerals:

1. a bridge deck; 2. supporting the longitudinal beam; 3. a support beam; 4. an end support beam; 5. a tunnel foot locking anchor rod; 6. secondary lining of the tunnel; 7. tunnel surrounding rock; 8. primary support steel frames of the tunnels; 9. a tunnel pile foundation; 10. is spanned across the building.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The utility model is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.

Wherein the showings are for the purpose of illustrating the utility model only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the utility model thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.

Please refer to fig. 1 to 3, which are a bridge-lining combined structure with a cross-over function in a tunnel, comprising a bridge deck 1, wherein supporting longitudinal beams 2 are respectively fixed on two sides of the width direction below the bridge deck 1, a plurality of supporting beams 3 transversely arranged are fixed on the lower end surface of the bridge deck 1, the supporting beams 3 are uniformly arranged at intervals, two ends of the supporting beams 3 respectively penetrate through the supporting longitudinal beams 2 and then are fixedly connected with a tunnel primary support steel frame 8 in the tunnel into a whole, the tunnel primary support steel frame 8 tightly clings to the inner side wall of the tunnel to play a supporting role, and a tunnel secondary lining 6 is arranged on the inner side of the tunnel primary support steel frame 8. The tunnel outside is tunnel country rock. Below the deck slab 1 is a spanned building 10, the sides of the deck slab 1 extending onto the tunnel surrounding rock.

The end supporting beams 4 are positioned at two ends of the tunnel needing to cross the space, are concrete structural beams, are fixedly integrated with the supporting longitudinal beams 2, and are used for transversely transmitting load at the ends.

The tunnel pile foundations 9 in the tunnel are arranged at the crossing positions of the end supporting cross beams 4 and the supporting longitudinal beams 2, and the number of the tunnel pile foundations is four in total, and the tunnel pile foundations are used for supporting the whole bridge span structure. The tunnel pile foundation 9 is a reinforced concrete cast-in-place pile with a circular section.

The supporting longitudinal beam 2 spans the space needing to be spanned in the tunnel, namely, spans the spanned building 10, the supporting longitudinal beam 2 is a reinforced concrete beam which can adopt a rectangular section or a box section and is arranged at the foot part of the tunnel secondary lining 6 to be used as a main stress structure of the bridge span, and the transverse steel bar of the tunnel secondary lining 6 is anchored into the supporting longitudinal beam through a tunnel foot locking anchor rod 5, so that the supporting longitudinal beam 2 is connected with the tunnel secondary lining 6 above into a whole. The anchoring length of the steel bar meets the requirements of relevant specifications.

Support longeron 2 to extend certain length in the tunnel country rock of both sides tunnel bottom for support longeron 2 becomes continuous beam structure, and the roof beam in the both ends side span scope becomes elasticity foundation beam, can bear the load of tunnel pile foundation.

The supporting beam 3 is positioned between the two supporting longitudinal beams 2 and used for distributing bridge deck load, and the supporting beam 3 is a steel structure beam and can adopt H-shaped steel or I-shaped steel.

Two ends of the supporting beam 3 penetrate through the supporting longitudinal beam 2 and are welded with the tunnel primary support steel frame 8 into a whole. Welding adopts modes of welding seam connection, bolt connection and the like.

The bridge deck 1 is positioned on the support longitudinal beam 2 and the support cross beam 3, is used for directly bearing live load and is a reinforced concrete slab.

All exposed steel structure components need to be subjected to anticorrosion treatment.

The specific embodiment is as follows:

the support stringers 2 span the tunnel inside the spanned building 10, span 16 m. The support longitudinal beam 2 is a C40 reinforced concrete beam, and has a rectangular cross section with the cross-sectional dimension of 3000mm multiplied by 2000 mm. The supporting longitudinal beam 2 is arranged at the foot part of the tunnel secondary lining 6 and is used as a main stress structure of a bridge span, and the transverse steel bar of the tunnel secondary lining 6 is anchored into the supporting longitudinal beam 2, so that the supporting longitudinal beam 2 and the tunnel secondary lining 6 above the supporting longitudinal beam are connected into a whole. The anchoring length of the steel bar is 30D (D is the diameter of the steel bar).

The support longitudinal beam 2 extends 0.6B in the rock mass at the bottom of the tunnel at two sides, and B is a span of 16m, so that the support longitudinal beam 2 becomes a continuous beam structure, and the beams in the side span ranges at two ends become elastic foundation beams which can bear the load of the tunnel pile foundation.

The end supporting beam 4 is a C40 concrete structure beam, and has a rectangular cross section, and the cross section dimension is 2000mm multiplied by 2000 mm. The end supporting cross beam 4 and the supporting longitudinal beam 2 are fixedly connected into a whole for transversely transmitting load at the end.

The tunnel pile foundation 9 adopts a circular section C30 reinforced concrete cast-in-place pile with the diameter of 1.5 m.

Supporting beam 3 is the steel construction roof beam, adopts HW400 shaped steel, and supporting beam 3's interval corresponds with tunnel primary frame 8's interval, and tunnel primary frame 8 interval is 1m, and supporting beam 3's interval is 2 m.

And the two ends of the supporting beam 3 and the tunnel primary support steel frame 8 are welded by adopting angle welds.

The bridge deck slab is a C40 reinforced concrete slab, and the thickness of the slab is 300 mm.

The concrete construction method of the combined structure is divided into two types:

firstly, a tunnel is built, and a space to be spanned below the tunnel is built later.

Firstly, constructing a tunnel primary support steel frame 8 and a tunnel secondary lining 6 of a tunnel according to a traditional tunnel construction method, reserving reinforcing steel bars and section steel joints at arch feet of the tunnel primary support steel frame 8 and the tunnel secondary lining 6 respectively, and preparing a tunnel locking anchor rod 5 for fixing.

And in the second step, constructing the tunnel pile foundation 9 in the tunnel, wherein the tunnel pile foundation 9 generally adopts a manual hole digging process, reinforcing steel bars of the tunnel pile foundation 9 are placed after holes are dug manually, and then concrete is poured into the holes to form four tunnel pile foundations 9 used for supporting.

And thirdly, digging a space required by the bridge span structure in the hole, wherein the space comprises a space formed by extending the support longitudinal beams 2 into the tunnels at two ends and a space formed by the end part support cross beams 4, and the positions of the end part support cross beams 4 are positioned between the pouring spaces of the two support longitudinal beams 2 at the position of the tunnel pile foundation 9.

And fourthly, installing a steel structure of the supporting beam 3, and welding the steel structure and the arch foot reserved steel joint of the tunnel primary support steel frame 8 into a whole.

Fifthly, installing the reinforcing steel bars of the support longitudinal beam 2 in the excavated space of the support longitudinal beam 2, fixedly connecting the reinforcing steel bars of the support longitudinal beam 2 and the reinforcing steel bar joint reserved for the arch foot of the tunnel secondary lining 6 into a whole through a tunnel foot locking anchor rod 5, installing the reinforcing steel bars of the end support cross beam 4 in the space of the end support cross beam 4, welding the two ends of the reinforcing steel bars of the end support cross beam 4 in the reinforcing steel bars of the support longitudinal beam 2 into a whole respectively, and pouring concrete in the space of the support longitudinal beam 2 and the space of the end support cross beam 4 respectively to form the reinforced concrete beam.

And sixthly, digging a space of the bridge deck 1 above the supporting longitudinal beams 2 and the supporting cross beams 3, and pouring concrete in the space to form the bridge deck 1.

And seventhly, constructing a crossing space below the tunnel, and directly excavating the surrounding rock to the edge of the bridge crossing structure without other support measures.

The second type of under-spanning space has been formed.

Firstly, constructing a tunnel primary support steel frame 8 and a tunnel secondary lining 6 of a tunnel according to a traditional tunnel construction method, reserving steel bars and section steel joints at arch feet of the tunnel primary support steel frame 8 and the tunnel secondary lining 6, and preparing a tunnel foot locking anchor rod 5.

And thirdly, firstly excavating the space of the supporting longitudinal beam 2 on one side and quickly pouring concrete to form the supporting longitudinal beam 2, placing the reinforcing steel bars of the supporting longitudinal beam 2 in the space of the supporting longitudinal beam 2, and simultaneously pre-burying a supporting cross beam 3 and a section steel joint in the supporting longitudinal beam 2.

Fourthly, excavating the space of the supporting longitudinal beam on the other side and pouring concrete quickly to form the supporting longitudinal beam 2, placing the reinforcing steel bar of the supporting longitudinal beam 2 in the space of the supporting longitudinal beam 2, and meanwhile, pre-burying a supporting cross beam 3 and a section steel joint in the supporting longitudinal beam 2. And installing the steel bars of the end supporting cross beam 4 in the space of the end supporting cross beam 4, and pouring concrete in the space of the end supporting cross beam 4 to form the reinforced concrete beam.

And fifthly, constructing a steel structure of the rest supporting cross beam 3 in the middle part between the two supporting longitudinal beams 2, and welding the steel structure and the steel joint of the supporting cross beam 3 pre-embedded in the supporting longitudinal beam 2 into a whole.

The combined structure combines a bridge structure arranged in a traditional tunnel and a lining structure of the tunnel into a whole, and forms a lining structure with a bridge span function or a bridge span structure with a lining function. Such a combined structure comprises two technical features: 1) the main stress structure support longitudinal beam 2 of the bridge span system and the tunnel secondary lining 6 are connected into a whole, so that the rigidity of the support longitudinal beam 2 is increased, and the support longitudinal beam 2 can bear the great wall rock load transferred by the tunnel wall rock without too large section and reinforcing bars. 2) The supporting beam 3 and the tunnel primary steel frame 8 of steel construction are welded into a whole, can be with the help of lock foot stock and the system's stock on tunnel secondary lining 6 with whole bridge span structure locking on the country rock for the bridge span structure has become semi-elastic foundation beam, and then suppresses the 2 atress that support longeron warp, improves the bridge span structure. As the primary lining and the secondary lining of the tunnel are separated in the general condition, the primary lining generally adopts the structure of sprayed concrete, a profile steel framework and an anchor rod and is tightly attached to surrounding rocks; the secondary lining is generally of a reinforced concrete structure and is separated from the primary support structure. Therefore, the technical key points are that the bridge span structure is combined with the tunnel secondary lining 6 on one hand, and the bridge span structure is combined with the tunnel primary support steel frame 8 through the support cross beam 3 of the steel structure on the other hand.

The combined structure also optimizes the stress form of the supporting longitudinal beam 2 of the main stress member in the bridge span structure. Through will supporting longeron 2 to both ends extension to the elasticity foundation beam that forms both sides bears the load with the tunnel pile foundation jointly, has reduced the load of pile foundation on the one hand by a wide margin, improves the basis atress. On the other hand, the internal force of the beam is also reduced (the bending moment is greatly reduced by optimizing the simple beam into a continuous beam with an elastic support at the edge span).

Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.

Claims

1. Bridge-lining joint structure with cross function in tunnel, its characterized in that: including decking (1), decking (1) below width direction's both sides are fixed with support longeron (2) respectively, the lower terminal surface of decking (1) is fixed with support beam (3) of a plurality of horizontal settings, support beam (3) even interval sets up, the both ends of support beam (3) are passed respectively and are supported behind the longeron (2) and tunnel primary support steelframe (8) rigid coupling in the tunnel as an organic whole, the inboard of tunnel primary support steelframe (8) is tunnel secondary lining (6), the horizontal reinforcement anchor of tunnel secondary lining (6) is gone into in supporting longeron (2), tip supporting beam (4) are located the both ends that need to stride across the space in the tunnel, tip supporting beam (4) and support longeron (2) concreties integratively, tunnel pile foundation (9) in the tunnel set up at tip supporting beam (4) and support longeron (2) cross position.

2. The bridge-lining combined structure with the function of crossing inside a tunnel according to claim 1, wherein: the support longitudinal beams (2) extend to non-bridge span sections in the tunnels on two sides and are supported on the surrounding rocks.

3. The bridge-lining combined structure with the function of crossing inside a tunnel according to claim 2, wherein: the length of the support longitudinal beam (2) extending into the rock mass at the bottom of the tunnel at two sides is 0.6B, and B is a span needing to span a space.

4. The bridge-lining combined structure with the function of crossing inside a tunnel according to claim 1, wherein: the distance between the supporting beams (3) corresponds to the distance between the tunnel primary support steel frames (8), and the distance between the supporting beams (3) is integral multiple of the distance between the tunnel primary support steel frames (8).