Bridge structure suitable for V-shaped valley and construction method thereof

Abstract

The invention provides a bridge structure suitable for a V-shaped valley and a construction method of the bridge structure, and relates to the technical field of bridge engineering.A ground anchor type bridge is located above the V-shaped valley and between tunnels, and a cantilever beam is reliably connected to a rock stratum of the valley through a connecting component; the two side ends of the mid-span bridge are connected to the supports of the two cantilever beams respectively, then the bridge structure can be formed, a bridge lower structure does not need to be used, construction is convenient and fast, and safety and efficiency are achieved, and the technical problems that in the prior art, a bridge construction lower structure easily disturbs a soil structure of a mountainous area, and unpredictable risks are caused are solved.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering, and in particular to a bridge structure suitable for a V-shaped valley and a construction method thereof. Background Art

[0002] With the rapid development of my country's economy and the gradual improvement of the highway network, mountainous areas with complex terrain, such as southwestern Zhejiang and Sichuan and Chongqing, have gradually become the focus of transportation construction. Generally, highways often use tunnel structures when crossing mountainous areas, and use bridges when encountering valleys. In mountainous areas, due to poor transportation conditions and limited construction conditions, conventional bridges use prefabricated structures with a span of less than 50m, such as small box beams and T beams.

[0003] In mountain construction, the steep terrain and vertical slopes make high piers a common design, which undoubtedly increases the difficulty and cost of construction. What is more difficult is that due to the complex terrain, it is difficult for large construction machinery to enter the site smoothly, which seriously restricts the construction efficiency. When constructing the substructure, it is easy to disturb the soil structure in the mountainous area, causing unforeseen risks. How to solve the design and construction problems of bridges in valleys, especially V-shaped valleys, is something we need to study in depth. Summary of the invention

[0004] The purpose of the present invention is to provide a bridge structure suitable for V-shaped valleys and a construction method thereof, so as to alleviate the technical problem existing in the prior art that the substructure of bridge construction easily disturbs the soil structure in the mountainous area and causes unforeseen risks.

[0005] In a first aspect, the present invention provides a bridge structure suitable for a V-shaped valley, comprising: a ground-anchored bridge and a connecting member;

[0006] The ground-anchored bridge is located above the V-shaped valley, and the ground-anchored bridge is located between tunnels;

[0007] The ground-anchored bridge comprises a mid-span bridge and cantilever beams located on both sides of the mid-span bridge;

[0008] One end of the cantilever beam away from the mid-span bridge is connected to the rock formation of the valley through the connecting member;

[0009] Supports are provided at one end of the two cantilever beams close to the middle-span bridge, and both side ends of the middle-span bridge are respectively connected to the supports of the two cantilever beams.

[0010] In an alternative embodiment,

[0011] The connecting member is configured as an anchor rod structure or a prestressed steel rod.

[0012] In an alternative embodiment,

[0013] When the connecting member is configured as an anchor rod structure, one end of the anchor rod structure is fixed in the rock layer of the V-shaped valley, and the other end of the anchor rod structure is cast together with the cantilever beam.

[0014] In an alternative embodiment,

[0015] The anchor rod structure comprises an anchor rod body, an anchor rod pad and an anchor rod nut;

[0016] The rock formation is provided with an eyelet, the anchor pad cover is arranged at the opening of the eyelet, the anchor rod body passes through the anchor pad and extends into the eyelet, and an anchor nut is arranged on the portion of the anchor rod body extending through the eyelet.

[0017] In an alternative embodiment,

[0018] The anchor structure also includes a grouting pipe and an exhaust pipe;

[0019] The grouting pipe passes through the anchor pad and extends into the eyelet, and the grouting pipe is used to transport mortar into the eyelet;

[0020] The exhaust pipe passes through the anchor plate and extends into the bottom of the eyelet.

[0021] In an alternative embodiment,

[0022] The tunnels include dark tunnels and open tunnels;

[0023] The two cantilever beams are respectively connected to the dark tunnel and the open tunnel.

[0024] In a second aspect, a construction method for a bridge structure suitable for a V-shaped valley is provided, comprising the following steps:

[0025] Construct blind and open tunnels, level the site at the junction of the bridge and the tunnel, and remove the unfavorable geological layers until the valley rock layers are exposed;

[0026] A hole is formed in the rock formation, the anchor rod body is rotated and sent into the hole, and then mortar is poured into the hole;

[0027] The concrete is poured to form a cantilever beam, and the cantilever beam is poured together with the anchor rod body;

[0028] The mid-span bridge is erected on supports of two cantilever beams.

[0029] In an alternative embodiment,

[0030] The concrete pouring to form the cantilever beam comprises the following steps:

[0031] Pour concrete blocks at the location of the eyelets, tie the steel bars of the next adjacent concrete block, embed prestressed pipes, and pour concrete, and repeat this process many times to form a multi-segment cantilever beam.

[0032] In an alternative embodiment,

[0033] Pad stones and supports are set at the position of the corbel of the last section of the cantilever beam, and are erected at the cantilever beam support by hoisting, jacking or beam erection.

[0034] In an alternative embodiment,

[0035] After the middle span bridge is erected on the supports of two cantilever beams, the bridge deck paving and guardrail construction are carried out.

[0036] The bridge structure suitable for V-shaped valleys provided in this embodiment is formed by locating the ground-anchored bridge above the V-shaped valley and between the tunnels, and the cantilever beams are reliably connected to the rock formations in the valley through connecting components, and the two side ends of the mid-span bridge are respectively connected to the supports of the two cantilever beams. The bridge structure does not require the use of a bridge substructure, and the construction is convenient, safe and efficient. This alleviates the technical problem in the prior art that the substructure of the bridge construction easily disturbs the soil structure in the mountainous area and causes unforeseen risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 A schematic diagram of the overall structure of a bridge structure suitable for a V-shaped valley provided by an embodiment of the present invention;

[0039] Figure 2 A construction schematic diagram of step 1 in a construction method for a bridge structure suitable for a V-shaped valley provided in an embodiment of the present invention;

[0040] Figure 3 A construction schematic diagram of step 2 in a construction method for a bridge structure suitable for a V-shaped valley provided in an embodiment of the present invention;

[0041] Figure 4 A construction schematic diagram of step 3 in a construction method for a bridge structure suitable for a V-shaped valley provided in an embodiment of the present invention;

[0042] Figure 5A construction schematic diagram of step 4 in a construction method for a bridge structure suitable for a V-shaped valley provided by an embodiment of the present invention;

[0043] Figure 6 A construction schematic diagram of step 5 in the construction method of a bridge structure suitable for a V-shaped valley provided in an embodiment of the present invention;

[0044] Figure 7 A construction schematic diagram of step 6 in the construction method of a bridge structure suitable for a V-shaped valley provided in an embodiment of the present invention;

[0045] Figure 8 A construction schematic diagram of step 7 in the construction method of a bridge structure suitable for a V-shaped valley provided in an embodiment of the present invention;

[0046] Fig. 9 A construction schematic diagram of step 8 in the construction method of a bridge structure suitable for a V-shaped valley provided by an embodiment of the present invention;

[0047] Fig.10 A schematic structural diagram of an anchor rod structure in a bridge structure suitable for a V-shaped valley provided in an embodiment of the present invention.

[0048] Icons: 1-V-shaped valley; 11-valley rock formation; 2-ground-anchored bridge; 21-cantilever beam; 210-block 0; 211-block 1; 212-block 2; 213-block 3; 22-mid-span bridge; 23-prestressed beam; 31-blind tunnel; 32-open tunnel; 4-reinforced concrete cushion; 5-anchor structure; 51-anchor rod body; 52-anchor pad; 53-anchor nut; 54-grouting pipe; 55-exhaust pipe; 56-mortar; 6-hanging basket. DETAILED DESCRIPTION

[0049] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0051] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0053] like Figure 1 As shown, the bridge structure suitable for a V-shaped valley provided in this embodiment includes: a ground-anchored bridge 2 and a connecting member; the ground-anchored bridge 2 is located above the V-shaped valley 1, and the ground-anchored bridge 2 is located between tunnels; the ground-anchored bridge 2 includes a mid-span bridge 22 and cantilever beams 21 located on both sides of the mid-span bridge 22; one end of the cantilever beam 21 away from the mid-span bridge 22 is connected to the rock formation of the valley through the connecting member; supports are provided at one end of the two cantilever beams close to the mid-span bridge 22, and both side ends of the mid-span bridge 22 are respectively connected to the supports of the two cantilever beams.

[0054] Specifically, the ground-anchored bridge 2 is located above the V-shaped valley 1 and between the tunnels; the ground-anchored bridge 2 includes cantilever beams 21 on both sides and a mid-span bridge 22. The cantilever beams 21 can use connecting members to reliably connect the beam ends of the cantilever beams 21 to the rock formations in the valley. In an optional embodiment, the connecting members are configured as anchor structures 5 or prestressed steel rods.

[0055] The middle span bridge 22 is a hanging hole beam, the beam end is located at the bracket support of the cantilever beam 21, and the middle span bridge 22 is a steel box beam structure.

[0056] Furthermore, both sides of the ground-anchored bridge 2 are directly connected to the tunnel, and the tunnel is divided into a dark tunnel 31 and an open tunnel 32.

[0057] Furthermore, the valley rock layer 11 of the V-shaped valley 1 has good geological conditions, strong strength and integrity. To ensure good stress resistance, the valley rock layer 11 of the V-shaped valley 1 is formed into a stepped shape.

[0058] In an optional embodiment, when the connecting member is set as an anchor structure 5, one end of the anchor structure 5 is fixed in the rock layer of the V-shaped valley 1, and the other end of the anchor structure 5 is cast together with the cantilever beam 21, and the size and number of the anchor structure 5 are determined by calculation.

[0059] A corbel support is provided near the mid-span position of the cantilever beam 21, and the mid-span bridge 22 can be erected at the support of the cantilever beam 21 by hoisting, jacking or beam erection.

[0060] In an optional embodiment, if Fig.10 As shown, the anchor structure 5 includes an anchor rod body 51, an anchor rod pad 52 and an anchor rod nut 53; a hole is opened in the rock formation, and the anchor rod pad 52 is covered at the opening of the hole. The anchor rod body 51 passes through the anchor rod pad 52 and extends into the hole. The part of the anchor rod body 51 that passes through the hole is provided with an anchor rod nut 53, and the anchor rod body 51 is fixed by the cooperation of the anchor rod nut 53 and the anchor rod pad 52.

[0061] In an optional embodiment, the anchor structure 5 also includes a grouting pipe 54 and an exhaust pipe 55; the grouting pipe 54 passes through the anchor pad 52 and extends into the eyelet, and the grouting pipe 54 is used to transport mortar 56 into the eyelet, thereby achieving the pouring and fixing of the mortar 56 and the anchor rod body 51; the exhaust pipe 55 passes through the anchor pad 52 and extends into the bottom of the eyelet, so as to facilitate the discharge of air in the eyelet to avoid affecting the pouring quality.

[0062] The bridge structure suitable for V-shaped valleys provided in this embodiment is formed by positioning the ground-anchored bridge 2 above the V-shaped valley 1 and between the tunnels, the cantilever beam 21 being reliably connected to the rock layer of the valley through connecting components, and the two side ends of the mid-span bridge 22 being respectively connected to the supports of the two cantilever beams. The bridge structure does not require the use of a bridge substructure, and the construction is convenient, safe and efficient. This alleviates the technical problem in the prior art that the substructure of the bridge construction easily disturbs the soil structure in the mountainous area and causes unforeseen risks.

[0063] On the basis of the above embodiments, the construction method of the bridge structure applicable to the V-shaped valley provided in this embodiment comprises the following steps:

[0064] Step 1: Figure 2 As shown, the construction of blind and open tunnels, the construction and protection of the upper and lower steps at the tunnel entrance, the permanent side slope protection of the tunnel portal and the open tunnel are carried out according to the normal mining method tunnel construction technology, the stability and safety of the structure are enhanced, the site is leveled at the connection between the bridge and the tunnel, and the unfavorable geological layers are removed until the valley rock layer 11 is exposed.

[0065] Anchor rods are used to drill holes at the position of block 210 of the designed ground-anchored bridge 2, and the anchor rods are sent into the holes while being rotated, and mortar 56 is poured.

[0066] Step 2: If Figure 3 As shown, the steel bars of bridge block No. 0 210 are tied, and prestressed corrugated pipes are embedded in accordance with design requirements, and concrete of block No. 0 210 is poured. After the concrete strength, elastic modulus and age meet the design requirements, the prestressed tendons 23 are tensioned.

[0067] Step 3: If Figure 4 As shown, the hanging basket 6 is assembled on the segment of block 0 210.

[0068] Step 4: Figure 5 As shown, the segmental steel bars of block No. 1 211 are tied, the prestressed pipes are embedded, and the concrete of block No. 1 211 is poured. After the strength, elastic modulus and age of the concrete reach the design requirements, the prestressed tendons 23 are tensioned.

[0069] Step 5: Figure 6 As shown, the above construction steps of the hanging basket 6 are repeated to form the second block 212 and the third block 213 until the last section of the cantilever beam 21.

[0070] Step 6: Figure 7 As shown, in order to avoid stress concentration caused by excessive tension in the prestressed bundle 23 of the zero block 210, the zero block 210 can be divided into several parts according to the span of the bridge and the stress conditions, and cast in the later stage of segment construction.

[0071] Step 7: Figure 8 As shown, a reinforced concrete cushion layer 4 and a support are arranged at the position of the last segment corbel of the cantilever beam 21 .

[0072] Step 8: Fig. 9 As shown, it is erected at the support of the cantilever beam 21 by hoisting, jacking or beam erection.

[0073] After completing the above steps, the open hole structure construction will be carried out, and the construction of auxiliary structures such as bridge deck pavement and guardrails will be carried out.

[0074] The construction method of the bridge structure suitable for V-shaped valleys provided in this embodiment has the advantages of not requiring a bridge substructure, being convenient to construct, safe and efficient, and having significant economic benefits.

[0075] 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 it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bridge structure suitable for a V-shaped valley, characterized in that: include: Ground-anchored bridge (2) and connecting members; The ground-anchored bridge (2) is located above the V-shaped valley (1), and the ground-anchored bridge (2) is located between tunnels; The ground-anchored bridge (2) comprises a mid-span bridge (22) and cantilever beams (21) located on both sides of the mid-span bridge (22); One end of the cantilever beam (21) away from the mid-span bridge (22) is connected to the rock formation of the valley through the connecting member; Supports are provided at one end of the two cantilever beams close to the mid-span bridge (22), and both side ends of the mid-span bridge (22) are respectively connected to the supports of the two cantilever beams.

2. The bridge structure suitable for V-shaped valley according to claim 1, characterized in that: The connecting member is configured as an anchor rod structure (5) or a prestressed steel rod.

3. The bridge structure suitable for V-shaped valley according to claim 2, characterized in that: When the connecting member is configured as an anchor rod structure (5), one end of the anchor rod structure (5) is fixed in the rock layer of the V-shaped valley (1), and the other end of the anchor rod structure (5) is cast together with the cantilever beam (21).

4. The bridge structure suitable for V-shaped valley according to claim 3, characterized in that: The anchor rod structure (5) comprises an anchor rod body (51), an anchor rod pad (52) and an anchor rod nut (53); The rock formation is provided with an eyelet, the anchor pad (52) is covered at the opening of the eyelet, the anchor rod body (51) passes through the anchor pad (52) and extends into the eyelet, and an anchor nut (53) is provided at the portion of the anchor rod body (51) extending through the eyelet.

5. The bridge structure suitable for V-shaped valley according to claim 4, characterized in that: The anchor rod structure (5) further comprises a grouting pipe (54) and an exhaust pipe (55); The grouting pipe (54) passes through the anchor pad (52) and extends into the eyelet, and the grouting pipe (54) is used to transport mortar (56) into the eyelet; The exhaust pipe (55) passes through the anchor plate (52) and extends into the bottom of the eyelet.

6. The bridge structure suitable for V-shaped valley according to claim 1, characterized in that: The tunnel comprises a dark tunnel (31) and an open tunnel (32); The two cantilever beams (21) are respectively connected to the dark tunnel (31) and the open tunnel (32).

7. A construction method for a bridge structure suitable for a V-shaped valley based on any one of claims 1 to 6, characterized in that: The following steps are involved: Constructing a blind tunnel (31) and an open tunnel (32), leveling the site at the junction of the bridge and the tunnel, and removing the unfavorable geological layers until the valley rock layer (11) is exposed; A hole is formed in the rock formation, the anchor rod body (51) is rotated and inserted into the hole, and then mortar (56) is poured into the hole; Concrete is poured to form a cantilever beam (21), and the cantilever beam (21) and the anchor rod body are poured together; The middle span bridge (22) is erected on the supports of the two cantilever beams (21).

8. The construction method of a bridge structure suitable for a V-shaped valley according to claim 7, characterized in that: The concrete pouring to form the cantilever beam (21) comprises the following steps: Concrete blocks are poured at the positions of the eyelets, steel bars of the next adjacent concrete block are tied, prestressed pipes are embedded, and concrete is poured, and the process is repeated for multiple times to form a cantilever beam (21) with multiple sections.

9. The construction method of a bridge structure suitable for a V-shaped valley according to claim 8, characterized in that: A cushion stone and a support are arranged at the position of the last segment corbel of the cantilever beam (21), and are erected at the support of the cantilever beam (21) by means of hoisting, jacking or beam erection.

10. The construction method of a bridge structure suitable for a V-shaped valley according to claim 7, characterized in that: After the mid-span bridge (22) is erected on the supports of the two cantilever beams (21), the bridge deck paving and guardrail construction are carried out.

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