Ramp bridge deformation control reinforcing structure and construction method

Abstract

The present application relates to a kind of slope bridge deformation control reinforcing structure and construction method, belong to geotechnical engineering, including bridge pile foundation, bridge pile cap, anchor reinforcement structure, support structure and connecting structure.The present application only by strengthening anchor structure solves the deformation of bridge pile cap, low in cost, good effect;The construction method proposed is simple in operation, quality is easy to control, operation step sequence and key point are clear, can guarantee implementation effect, has the application prospect of popularization, and meets the requirements of environmental protection.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of geotechnical engineering, in particular to a slope bridge deformation control reinforcement structure and construction method. BACKGROUND

[0002] Slope terrain is the main landform of mountainous areas, and slope terrain is prone to form unstable natural slopes, landslides or rock pile bodies, etc. When the slope mountain is affected by rainfall, engineering disturbance, earthquakes, etc., its stability is getting worse and worse. Therefore, the stability evolution process of the slope engineering must be considered when the engineering passes through the slope, and the engineering structure set must be safe and reliable. When the bridge engineering passes through the slope terrain, since the bridge engineering mainly considers vertical bearing, its ability to resist horizontal load is weak, so there are a large number of cases of bridge lateral deformation exceeding the limit even damage in engineering practice. The prior art "a slope terrain bridge pier deformation repair structure and repair method" and "a rock pile landslide area bridge pier reinforcement structure" are used to solve the above problems. The former is used for an already deformed bridge structure, and the latter proposes a reinforcement structure for preventing bridge deformation in advance. However, the bridge pile foundation in the reinforcement structure of the latter still bears the landslide thrust, but the force borne is greatly reduced. When the height of the bridge pier is large, even the small deformation of the pile foundation will be amplified many times to the top of the pier, and the deformation of the upper reinforcement pile will squeeze the bridge pile foundation structure, further increasing the deformation of the bridge. Therefore, how to effectively control the deformation of the reinforcement structure and the construction method of the bridge has great significance, and should have the characteristics of good deformation control effect, convenient construction, good economy, environmental protection and facilitation of popularization. SUMMARY

[0003] In order to solve the above problems, the purpose of the present application is to provide a slope bridge deformation control reinforcement structure and construction method to effectively solve the problem of excessive lateral deformation control of unstable slope bridges.

[0004] In the present application, the bridge pile foundation is a rigid force structure towards the mountain side, the connecting structure is a bidirectional rigid tension structure, the support structure is a rigid force structure with bidirectional action of rigidity and flexibility, and the anchor reinforcement structure is a small-interval super-strong tension structure with a post-deformation of less than 10% of the material deformation.

[0005] In order to achieve the above purpose, the present application adopts the following technical solutions:

[0006] A slope bridge deformation control reinforcement structure, comprising a bridge pile foundation, a bridge pile cap, an anchor reinforcement structure, a support structure and a connecting structure.

[0007] The bridge pile cap is a rigid force structure towards the mountain side, the connecting structure is a bidirectional rigid tension structure, and the support structure is a rigid force structure with bidirectional action of rigidity and flexibility.

[0008] The anchor tension reinforcement structure comprises stable anchor tension structures arranged at intervals in the unstable slope body and reinforcing anchor tension structures arranged at positions corresponding to the bridge bearing platforms; the reinforcing anchor tension structure is a small-interval super-strong tension structure, and a later-stage deformation is less than 10% of material deformation;

[0009] The stable anchor tension structure is used to solve all the downward sliding forces of the upper part of the unstable slope, and the reinforcing anchor tension structure is used to solve the downward sliding forces between the stable anchor tension structure and the bridge pile foundation.

[0010] The support structure is arranged at the outer end of the reinforcing anchor tension structure, and is locked on the support structure after the reinforcing anchor tension structure is subjected to super tension stress.

[0011] The connecting structure is fixedly connected with the bridge bearing platform and the support structure at two ends respectively.

[0012] Further, the stable anchor tension structure adopts a traditional anchor rod or anchor cable structure, and the arrangement interval is determined according to the calculation of the downward sliding force, and the minimum interval meets the requirements of the current specification.

[0013] Further, in the stable anchor tension structure, the minimum interval is not less than 3 m, and the safety factor is not less than 1.25.

[0014] Further, the reinforcing anchor tension structure adopts a small-interval prestressed anchor cable structure, the inner anchoring segments of the reinforcing anchor tension structure are arranged at intervals and staggered, the locking tension force of the reinforcing anchor tension structure is 1.3-1.5 times of the downward sliding force, and is not greater than 90% of the material strength of the anchor tension structure,

[0015] Further, in the reinforcing anchor tension structure, the small-interval prestressed anchor cable structure is adopted, the arrangement interval is 1.5-2 m, the length direction interval of the anchoring body is not less than 10 m, the transverse interval is not less than 3 m, the safety factor is not less than 1.5, the later-stage deformation growth is less than 10% of the total material deformation, and the arrangement width is greater than 5 m on both sides of the bridge bearing platform.

[0016] The present application also relates to a construction method of the slope bridge deformation control reinforcement structure, comprising the following steps:

[0017] Step (1) constructing the reinforcing anchor tension structure.

[0018] Step (2) constructing the support structure, embedding a steel pipe in the support structure, passing the outer anchor head of the reinforcing anchor tension structure through the steel pipe, and arranging connecting steel bars outwardly from the main steel bars of the support structure, and fixedly connecting the connecting steel bars with the main steel bars.

[0019] Step (3) after the concrete of the support structure reaches the design strength, tensioning the reinforcing anchor tension structure and locking on the support structure, the locking tension force is 1.3-1.5 times of the downward sliding force, and is not greater than 90% of the material strength of the anchor tension structure; the tensioning is ensured to be sufficient, but not to exceed the material ultimate strength, so as to reduce the later-stage deformation.

[0020] Step (4) construction of the bridge pile foundation.

[0021] Step (5) construction of the bridge pile foundation top bridge pile cap, the main reinforcement of the bridge pile cap is provided with connecting reinforcement outside, and the connecting reinforcement is fixedly connected with the main reinforcement.

[0022] Step (6) after the bridge pile foundation and the bridge pile cap concrete reach the design strength, the connecting reinforcement between the bridge pile cap and the support structure is fixed by using a tension rope, the length of the tension rope is contracted, the bridge pile cap and the support structure are in a pre-stress state, the bridge pile cap and the support structure are effectively pre-stressed, the deformation of the bridge pile cap in the later stage is reduced, and the bridge is ensured to not generate an undesirable pre-deformation.

[0023] Further, before step (1), the stable anchoring structure is constructed in stages from top to bottom and is fixed by being tensioned with an external frame beam or plate; and after step (6), the reinforcement cage of the connecting structure is bound, wherein the main reinforcement corresponding to the position of the connecting reinforcement reserved for the bridge pile cap and the support structure is connected to the connecting reinforcement by welding or sleeve connection, so as to meet the requirements of the reinforcement joint; the bridge pile cap and the support structure are effectively connected and force-transferred, the connecting structure, the bridge pile cap and the support structure form an integral structure, and are all in a pre-stress state, which is beneficial to controlling the deformation of the bridge pile cap; the concrete of the connecting structure is poured; and the pier and the top beam structure above the bridge pile cap are constructed.

[0024] Further, in step (1), the net distance of the adjacent reinforced anchoring structure anchoring bodies in the length direction is not less than 10 m, and the transverse distance is not less than 3 m; and the special requirements of the small-distance anchoring structure are met, so as to realize that the anchoring sections are not affected by each other.

[0025] Further, in step (2), the connecting reinforcement is fixedly connected with the main reinforcement, the length interval of the connecting reinforcement extending out of the support structure is 50 cm and 100 cm, and the interval of the connecting reinforcement is 30-50 cm, wherein the outer extension end of 2-4 connecting reinforcements at the middle position is formed into a ring structure.

[0026] In step (5), the length interval of the connecting reinforcement extending out of the bridge pile cap is 50 cm and 100 cm, the interval of the connecting reinforcement is 30-50 cm, and the outer extension end of 2-4 connecting reinforcements at the middle position is formed into a ring structure; the elongated reinforcement provides effective connection for the later construction of the connecting structure, and the ring structure provides conditions for applying the tension force between the bridge pile cap and the support structure by using the tension rope.

[0027] Further, in step (6), the total tension force of the tension rope is between 10-50 kN, and the vertical deflection angle of the bridge pile cap is less than 2 ‰.

[0028] The application solves all the downward forces of the upper part of the unstable slope by using the stable anchor structure, mainly ensures stability, and the deformation amount can not be controlled; the reinforced anchor structure is used to solve the downward force between the stable anchor structure and the bridge pile foundation, high safety factor is adopted to realize high stability, so that the support structure has sufficient bearing capacity and safety reserve, can provide sufficient tension for the deformation control of the bridge pile foundation and the bridge pile cap in the later stage, the super tension locking close to the material limit in advance can greatly eliminate the deformation of the reinforced anchor structure itself and the transmission to the bridge pile cap; the prestress of the bridge pile cap and the support structure is applied in advance by the tension rope, and the connection structure is constructed, which can reduce the later deformation of the bridge pile cap, and the vertical deflection angle of the bridge pile cap is controlled to avoid the generation of too large deflection angle of the bridge to affect the vertical stress capacity of the upper structure; the bridge pile cap, the connection structure and the support structure are integrally connected, the stress transmission effect is good, the super strong bearing capacity of the support structure is connected and fixed with the reinforced anchor structure in advance, and then the connection structure is constructed, so that the super large tension of the reinforced anchor structure is not directly transmitted to the bridge pile cap structure, therefore, the bridge pile cap structure will not produce large horizontal deformation, the actual horizontal force of the bridge pile cap can be dynamically transmitted to the support structure, the horizontal force of the bridge pile cap is less than the total force of the reinforced anchor structure, and the reinforced anchor structure and the bridge pile cap structure will not produce deformation, only when the horizontal force of the bridge pile cap is greater than the total force of the reinforced anchor structure, the reinforced anchor structure and the bridge pile cap structure will start to produce deformation, the bridge structure has been damaged at this time by the traditional reinforcement measures; only the deformation of the bridge pile cap is solved by the reinforced anchor structure, the cost is low and the effect is good, more than 50% of the cost is saved by setting the reinforcement pile to solve the deformation of the bridge, the deformation amount is less than 10% of the traditional reinforcement measures; the construction method is simple in operation, easy in quality control, clear in operation steps and key points, can guarantee the implementation effect, has popularization and application prospect, and meets the requirements of environmental protection. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a cross section schematic view of the unstable slope bridge deformation control reinforcement structure of the embodiment of the application;

[0030] Figure 2 is a top view of the unstable slope bridge deformation control reinforcement structure of the embodiment of the application;

[0031] In the figure: 1-bridge pile foundation, 2-bridge pile cap, 3-anchor reinforcement structure, 31-reinforced anchor structure, 32-stable anchor structure, 4-support structure, 5-connection structure. DETAILED DESCRIPTION

[0032] With reference to the accompanying drawings, the technical solutions in the embodiments will be described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0033] Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be understood as the common meanings understood by those of ordinary skill in the art. The terms "first", "second", and the like used in the embodiments do not represent any order, number, or importance, but are only used to distinguish different components. The terms "include", "contain", and the like mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "mount", "connect", and "connect" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral connection; can be directly connected, or indirectly connected through an intermediate medium; can be internal communication of two elements. "Up", "down", "left", "right", "horizontal", and "vertical" are only used to describe the relative positions of the components in the drawings, and these directional terms are relative concepts, which are used for relative description and clarification, and can be changed accordingly according to the change of the position of the components in the drawings.

[0034] As shown in Figure 1 The slope bridge deformation control reinforcement structure of the present embodiment includes a bridge pile foundation 1, a bridge pile cap 2, an anchor reinforcement structure 3, a support structure 4, and a connecting structure 5.

[0035] The anchor reinforcement structure 3 includes a stable anchor structure 32 arranged at intervals in the unstable slope body, and a reinforcing anchor structure 31 arranged at the corresponding position of the bridge pile cap.

[0036] The stable anchor structure 32 adopts a conventional anchor rod or anchor cable structure, and the interval is determined according to the sliding force. The minimum interval meets the requirements of the current specification, that is, not less than 3m. The stable anchor structure 32 is used to solve all the sliding forces of the upper part of the unstable slope. The safety factor is not less than 1.25.

[0037] The reinforced anchor tension structure 31 can adopt a small-spacing prestressed anchor cable structure, and the spacing is 1.5-2 m. Different from the requirement of the specification, the inner anchoring sections of the reinforced anchor tension structure 31 are arranged in staggered mode, the spacing of the anchoring body in the length direction is not less than 10 m, and the lateral spacing is not less than 3 m. The locking tension of the reinforced anchor tension structure 31 is 1.3-1.5 times of the sliding force, and is not greater than 90% of the strength of the anchor tension structure material. The reinforced anchor tension structure 31 is used to solve the sliding force between the stable anchor tension structure and the bridge pile foundation. The safety factor is not less than 1.5, the late deformation growth is less than 10% of the total deformation of the material, and the width of the setting is greater than 5 m on both sides of the bridge pile cap.

[0038] The support structure 4 is arranged at the outer end of the reinforced anchor tension structure 31, and adopts a reinforced concrete structure. After the reinforced anchor tension structure 31 is subjected to super tension, it is locked on the support structure 4.

[0039] The connecting structure 5 adopts a reinforced concrete structure, and is fixedly connected with the bridge pile cap 2 and the support structure 4 at both ends. The connecting structure 5 is a pre-stressed structure, that is, before the construction of the connecting structure 5, the bridge pile cap and the support structure are connected through anchor cables, and the bridge pile cap 2 and the support structure 4 are subjected to a certain pre-stress through the tension of the anchor cables, and then the reinforced concrete of the connecting structure is constructed.

[0040] Therefore, the bridge pile cap 2 of the embodiment is a rigid stress structure towards the side of the mountain, the connecting structure 5 is a bidirectional rigid tension structure, the support structure is a rigid stress structure with bidirectional action of rigidity and flexibility, and the reinforced anchor tension structure is a small-spacing super-strong tension structure with a late deformation less than 10% of the material deformation.

[0041] The embodiment also provides a construction method of the slope bridge deformation control reinforcing structure, which comprises the following steps:

[0042] Step A: The stable anchor tension structure is constructed in stages from top to bottom, and is tensioned and fixed with the external frame beam or plate.

[0043] Step B: The reinforced anchor tension structure is constructed. The clear spacing of the anchoring bodies of the adjacent reinforced anchor tension structures in the length direction is not less than 10 m, and the lateral spacing is not less than 3 m. The small-distance anchor tension structure has special requirements to realize that the anchoring sections are not affected by each other.

[0044] Step C, construction of the support structure, embedding steel pipes in the support structure, the external anchor head of the anchor structure penetrating through the steel pipes, the main steel bars of the support structure being provided with connecting steel bars outside, the connecting steel bars being fixedly connected with the main steel bars, the length of the connecting steel bars extending out of the support structure being taken as 50 cm and 100 cm, the interval of the connecting steel bars being taken as 30-50 cm, the outer extension ends of 2-4 connecting steel bars at the middle position being made into a ring structure, the elongated steel bars providing effective connection for the construction of the connecting structure in the later stage, and the ring structure providing conditions for applying tension force between the support structure and the bridge bearing platform in the later stage.

[0045] Step D, after the concrete of the support structure reaches the design strength, the anchor structure is tensioned and locked on the support structure, the locking tension being 1.3-1.5 times of the sliding force and not more than 90% of the material strength of the anchor structure, so as to ensure sufficient tension and not exceeding the ultimate strength of the material, thereby reducing the deformation in the later stage.

[0046] Step E, construction of the bridge pile foundation.

[0047] Step F, construction of the bridge bearing platform on the top of the bridge pile foundation, the main steel bars of the bridge bearing platform being provided with connecting steel bars outside, the connecting steel bars being fixedly connected with the main steel bars, the length of the connecting steel bars extending out of the bridge bearing platform being taken as 50 cm and 100 cm, the interval of the connecting steel bars being taken as 30-50 cm, the outer extension ends of 2-4 connecting steel bars at the middle position being made into a ring structure, the elongated steel bars providing effective connection for the construction of the connecting structure in the later stage, and the ring structure providing conditions for applying tension force between the support structure and the bridge bearing platform in the later stage.

[0048] Step H, after the concrete of the bridge pile foundation and the bridge bearing platform reaches the design strength, the ring connecting steel bars reserved between the bridge bearing platform and the support structure are fixed by using a tension rope, the bridge bearing platform and the support structure being in a pre-stressed state by contracting the length of the tension rope, the total tension of the tension rope being between 10-50 kN, and the vertical deflection angle of the bridge bearing platform being less than 2‰, so as to effectively realize the pre-stress of the bridge bearing platform and the support structure, reduce the deformation of the bridge bearing platform in the later stage, and ensure that the bridge does not produce an undesirable pre-deformation.

[0049] Step I, binding the steel cage of the connecting structure, the main steel bars corresponding to the reserved connecting steel bars of the bridge bearing platform and the support structure being connected with the main steel bars by welding or sleeve, so as to meet the requirements of the steel joint, effectively realize the effective connection and force transmission between the bridge bearing platform and the support structure, and form an integral structure of the connecting structure, the bridge bearing platform and the support structure, and all being in a pre-stressed state, thereby being beneficial to controlling the deformation of the bridge bearing platform.

[0050] Step J, pouring the concrete of the connecting structure.

[0051] Step K, construction of the pier and the top beam structure above the bridge bearing platform.

[0052] The above merely provides the preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A deformation control reinforcement structure for a ramp bridge, characterized by: The bridge pile foundation, the bridge pile cap, the anchor reinforcement structure, the support structure, and the connecting structure are included. The bridge pile cap is a rigid force structure towards the side of the abutment, the connecting structure is a bidirectional rigid tension structure, and the support structure is a rigid force structure with bidirectional action of rigidity and flexibility. The anchor reinforcement structure includes stable anchor structures with an intermediate distance in the unstable slope body and reinforcing anchor structures arranged at the corresponding positions of the bridge pile cap. The reinforcing anchor structure is a small-interval super-strong tension structure, and the post-deformation is less than 10% of the material deformation. The stable anchor structure is used to solve all the downward forces of the unstable slope. The reinforcing anchor structure is used to solve the downward force between the stable anchor structure and the bridge pile foundation. The support structure is arranged at the outer end of the reinforcing anchor structure, and the reinforcing anchor structure is locked on the support structure after being subjected to super tension. The connecting structure is fixedly connected with the bridge pile cap and the support structure at both ends. The reinforcing anchor structure adopts a small-interval prestressed anchor structure, the inner anchoring segments of the reinforcing anchor structure are arranged in an interval staggered manner, the locking tension of the reinforcing anchor structure is 1.3-1.5 times the downward force, and is not greater than 90% of the material strength of the anchor structure. The construction method of the reinforcing structure includes the following steps. Step (1): constructing the reinforcing anchor structure. Step (2): constructing the support structure, embedding a steel pipe in the support structure, and passing the outer anchor head of the reinforcing anchor structure through the steel pipe. Step (3): after the concrete of the support structure reaches the design strength, the reinforcing anchor structure is tensioned and locked on the support structure. Step (4): constructing the bridge pile foundation. Step (5): constructing the bridge pile cap at the top of the bridge pile foundation. Step (6): after the concrete of the bridge pile foundation and the bridge pile cap reaches the design strength, the connecting steel bars reserved in the bridge pile cap and the support structure are fixed by using a tension rope.

2. The deformation control reinforcement structure for a ramp bridge according to claim 1, characterized by: Before step (1), the stable anchor structure is constructed in stages from top to bottom and is tensioned and fixed with the external frame beam or plate.

3. The deformation control reinforcement structure for a ramp bridge according to claim 2, characterized by: After step (6), the steel reinforcement cage of the connecting structure is bound, the main reinforcement corresponding to the reserved connecting steel bars of the bridge pile cap and the support structure is connected by welding or sleeve, the steel reinforcement joint requirement is met, the concrete of the connecting structure is poured, and the pier and the top beam structure above the bridge pile cap are constructed. The stable anchor structure adopts a traditional anchor rod or anchor cable structure, and the setting interval is determined according to the calculation of the downward force. In the stable anchor structure, the minimum interval is not less than 3m, and the safety factor is not less than 1.

25.

4. The deformation control reinforcement structure for a ramp bridge according to Claim 1, characterized by: In the reinforced anchor structure, small interval prestressed anchor cable structure is used, and the interval is 1.5-2 m; the interval of anchoring body in length direction is not less than 10 m, and the lateral interval is not less than 3 m; the safety factor is not less than 1.5, the late deformation growth is less than 10% of the total deformation of the material, and the width is greater than 5 m on both sides of the bridge bearing platform.

5. The deformation control reinforcement structure for a ramp bridge according to Claim 1, characterized by: In step (1), the net distance of the anchoring body of the adjacent reinforced anchor structure in length direction is not less than 10 m, and the lateral interval is not less than 3 m.

6. The ramp bridge deformation control reinforcement structure according to claim 1, in step (2), the connecting steel bars are fixedly connected with the main steel bars, the length interval of the connecting steel bars extending out of the support structure is 50 cm and 100 cm, and the connecting steel bars are arranged at a spacing of 30-50 cm, wherein, The extended ends of 2-4 connecting steels in the middle position are made into a ring structure. In step (5), the length interval extending out of the bridge bearing platform is 50 cm and 100 cm, and the interval of the connecting steels is 30-50 cm, wherein the extended ends of 2-4 connecting steels in the middle position are made into a ring structure.

7. The deformation control reinforcing structure of the ramp bridge according to claim 1, wherein in step (6), the total tension of the shrinkage tension rope is between 10-50 kN, and the vertical deflection angle of the bridge bearing platform is less than 2‰.

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