Bridge support with double supports at beam end, leveling method of bridge support and bridge with double supports at beam end

Abstract

The invention relates to the field of bridge construction, in particular to a bridge support with double supports at the beam end, a leveling method of the bridge support and a bridge with the double supports at the beam end. The method for leveling the supports of the bridge with the double supports at the beam end comprises the steps that A, delayed coagulation mortar with the thickness of t1 is laid above lower padstones on the two sides of the first end of a main beam of a bridge body; b, permanent supports are installed above the delayed coagulation mortar on the two sides of the first end correspondingly; c, a temporary support is arranged between the fixed supports on the two sides of the first end of the bridge body main beam; e, in the delayed coagulation reaction state of the delayed coagulation mortar, the bridge body main beam is erected on the fixed supports and the temporary supports at the first end and the second end, and the permanent supports on the two sides descend in the delayed coagulation mortar in the delayed coagulation reaction state in a self-adaptive mode under the gravity effect of the upper bridge body main beam; and F, after the delayed coagulation mortar is completely solidified, the temporary support is removed. By means of the thickness-adaptive delayed coagulation mortar and the temporary support, the problem that the hollow slab beam with the double supports arranged at the beam end is disengaged is solved.

Description

Technical Field

[0001] The invention relates to the field of bridge construction, in particular to a bridge support with double supports at a beam end and a leveling method thereof, and a bridge with double supports at a beam end. Background Art

[0002] At present, there are a large number of hollow slab bridges with double supports at the beam ends in China, and the problem of empty supports occurs frequently. The empty supports problem causes different degrees of damage to the supports, precast beams and bridge decks during operation, which affects the stress and durability of the bridge structure and even affects the safety of the bridge in severe cases.

[0003] In order to avoid the bearing from falling off, the following measures need to be taken during construction:

[0004] (a) Before installing the bearing, re-measure the top elevation of the lower cushion stone to ensure that the elevation of the lower cushion stone during construction is consistent with the design. If it is inconsistent, repair measures must be taken;

[0005] (b) After the precast beams are hoisted and during final acceptance, it is required to check whether the bottom supports of the beams are empty, and to add pads to the empty supports.

[0006] However, the above measures are only remedial measures for the situation where the bearing is empty. On the one hand, the cost is high, and on the other hand, there is a high probability that similar problems will occur again after the repair. Summary of the invention

[0007] 1. Technical issues to be solved

[0008] The present invention is expected to at least partially solve one of the above technical problems.

[0009] 2. Technical Solution

[0010] A first aspect of the present invention provides a leveling method for a double-support bridge support at a beam end. The leveling method for a double-support bridge support at a beam end comprises:

[0011] Step A, laying slow-setting mortar with a thickness of t1 on the upper side of the lower cushion stones on both sides of the first end of the main beam of the bridge body;

[0012] Step B, respectively installing permanent bearings above the slow-setting mortar on both sides of the first end, the top surface elevation of the permanent bearing is set to "h+t2", where h is the design elevation of the top surface of the bearing, t2 is the downward pressure margin of the bearing, t1>t2≥0.5cm; the lower cushion stone, slow-setting mortar, and permanent bearing constitute an inherent bearing;

[0013] Step C: a temporary support is set between the inherent supports on both sides of the first end of the bridge main beam, and the top surface elevation of the temporary support is set to "h+d+Δ L ”, where d is the thickness of the pad stone on the support; Δ Lis the deformation of the temporary support; and t2 > Δ L ;

[0014] Step E: When the retarder mortar is in the retardation reaction state, the main girder of the bridge is erected on the inherent supports and temporary supports at the first end and the second end. Among them, the central part of the first end of the main girder of the bridge presses on the temporary support, and both sides of the first end of the main girder of the bridge are closely attached to the permanent supports on both sides through the bearing upper cushion stones. The permanent supports on both sides of the first end of the main girder of the bridge adaptively descend in the retarder mortar in the retardation reaction state under the action of the gravity of the upper main girder of the bridge.

[0015] Step F: After the retarder mortar is completely solidified, remove the temporary support.

[0016] In some embodiments of the present invention, in step A, the retarder mortar is one of the following: epoxy mortar, high-strength polymer mortar; in step E, the main girder of the bridge is erected on the inherent supports at the first end and the second end within 8 hours after the retarder mortar is laid; in step F, the temporary support is removed 24 hours after the main girder of the bridge is erected.

[0017] In some embodiments of the present invention, in step C, the deformation Δ of the temporary support L satisfies:

[0018]

[0019] wherein, t1 represents the expected working time of the temporary support, P represents the self-weight of one end of the main girder of the bridge before beam erection, A represents the effective stress area of the temporary support, E t represents the effective elastic modulus of the temporary support varying with time, L represents the elevation of the temporary support, and L = h + d + Δ L .

[0020] In some embodiments of the present invention, the mortar is: epoxy mortar; the stress area of a single permanent support is 0.0625 cm2.

[0021] In some embodiments of the present invention, in step A, mortar grooves are provided on the upper surfaces of the lower cushion stones on both sides of the first end of the main girder of the bridge; the mortar grooves match the shape of the permanent support and satisfy: 4 cm ≤ (S1 - S2) ≤ 8 cm, where S1 and S2 are the lateral expansion dimensions of the mortar groove and the permanent support respectively.

[0022] In some embodiments of the present invention, the temporary support is one of the following: sand box support, sulfur support;

[0023] In some embodiments of the present invention, the main girder of the bridge is: hollow slab beam, precast prestressed concrete box girder.

[0024] In some embodiments of the present invention, before step E, the following step is further included: step D, directly installing permanent bearings above the sub-padstones on both sides of the second end of the bridge body.

[0025] In some embodiments of the present invention, the sub-padstones and the temporary bearings are arranged on the capping beam or the bridge abutment.

[0026] The second aspect of the present invention provides a bridge bearing with double bearings at the beam ends. The bridge bearing with double bearings at the beam ends includes: the inherent bearings on both sides, and the inherent bearings include: a sub-padstone, on the upper surface of which a mortar groove is provided; a retarder mortar, laid in the mortar groove; and a permanent bearing, installed on the retarder mortar.

[0027] In some embodiments of the present invention, in the initial laying state and / or the retardation reaction state of the retarder mortar, the bridge bearing with double bearings at the beam ends further includes: a temporary bearing; wherein, in the initial laying state of the retarder mortar, the temporary bearing is arranged between the inherent bearings on both sides, and the top elevation thereof is set to "h + d + Δ L ", where d is the thickness of the upper padstone of the bearing; Δ L is the deformation amount of the temporary bearing; and t2 > Δ L ; wherein, in the retardation reaction state of the retarder mortar, the main beam of the bridge body is erected on the inherent bearings and the temporary bearings at the first end and the second end, wherein the central part of the first end of the main beam of the bridge body presses on the temporary bearing, both sides of the first end of the main beam of the bridge body are closely attached to the permanent bearings on both sides through the upper padstones of the bearings, and the permanent bearings on both sides of the first end of the main beam of the bridge body adaptively descend in the retarder mortar in the retardation reaction state under the gravity of the upper bridge body; wherein, in the final setting state of the retarder mortar, the temporary bearing is removed.

[0028] In some embodiments of the present invention, in the initial laying state of the retarder mortar, its thickness is t1; the top elevation of the permanent bearing is set to "h + t2", where h is the designed elevation of the bearing top surface, t2 is the pressing margin of the bearing, and t1 > t2 ≥ 0.5 cm; in the final setting state of the retarder mortar, the top elevation of the permanent bearing is "h".

[0029] In some embodiments of the present invention, the retarder mortar is one of the following: epoxy mortar, high-strength polymer mortar.

[0030] In some embodiments of the present invention, the temporary bearing is one of the following: sand box, sulfur bearing.

[0031] In some embodiments of the present invention, the main beam of the bridge body installed above the double bearings is: hollow slab beam, precast prestressed concrete box girder.

[0032] In some embodiments of the present invention, 1 cm ≤ t1 ≤ 3 cm; 0.5 cm ≤ t2 ≤ 2 cm; t1 > t2.

[0033] In some embodiments of the present invention, the mortar groove matches the shape of the permanent bearing, satisfying: 4 cm ≤ (S1 - S2) ≤ 8 cm, where S1 and S2 are the horizontal expansion dimensions of the mortar groove and the permanent bearing, respectively.

[0034] In some embodiments of the present invention, the deformation amount Δ of the temporary bearing L satisfies:

[0035]

[0036] where t1 represents the expected working time of the temporary bearing, P represents the weight of one end of the bridge main girder before the beam erection, A represents the effective stress area of the temporary bearing, E t represents the effective elastic modulus of the temporary bearing varying with time, L represents the elevation of the temporary bearing, and L = h + d + Δ L .

[0037] The third aspect of the present invention provides a bridge with double bearings at the beam ends. The bridge with double bearings at the beam ends is constructed by using the method for leveling the bearings of the bridge with double bearings at the beam ends as described above.

[0038] III. Beneficial Effects

[0039] (1) Without increasing too much cost and wasting too much construction period, and without sacrificing the force system of the structure, the present invention solves the problem of the void between the hollow slab beams with double bearings at the beam ends through the retarder mortar with self-adaptive thickness and the temporary bearing.

[0040] (2) The elevation H of the top surface of the temporary bearing is controlled according to "h + d + △L". After determining the elevation of the temporary bearing according to the above method, it can better adapt to the setting process of the retarder mortar, so that after the retarder mortar is completely solidified, the hollow slab bridge deck can reach the design height more accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a flowchart of the method for leveling the bearings of the bridge with double bearings at the beam ends according to an embodiment of the present invention.

[0042] Figure 2A and Figure 2B are Figure 1 the overall bearing top view and the left view of the left-end bearing group after implementing steps B and C in the method for leveling the bearings of the bridge with double bearings at the beam ends as shown.

[0043] Figure 3A and Figure 3B are respectively Figure 1 the overall bearing top view and the left view of the left-end bearing group after implementing step E in the method for leveling the bearings of the bridge with double bearings at the beam ends as shown.

[0044] Figure 4Aand Figure 4B respectively are Figure 1 The overall top view of the bridge bearings after implementing step F and the left view of the left-end bearing group in the method for leveling bridge bearings with double bearings provided at the beam ends as shown Specific implementation manners

[0045] As described above, during the use of the hollow slab bridge bearings with double bearings provided at the beam ends, problems such as uneven force on the bearings under the same beam and even no force on individual bearings are likely to occur. The applicant has deeply analyzed the reasons for the above problems and summarized as follows:

[0046] ① Generally, for the hollow slabs or small box girders corresponding to the plate bearings, the single beams are installed first and then connected into one body. The weight difference of the single beams will cause uneven force on the bearings;

[0047] ② The difference in the vertical stiffness of each bearing will cause uneven force on the bearings;

[0048] ③ Construction errors cannot ensure that all four bearings can be completely in close contact with the beam bottom.

[0049] In summary, the reasons for the problems are both the problems of the bridge structure and the construction problems. The present invention solves the problem of the hollow slab beam with double bearings at the beam ends being out of contact under the condition of not increasing too much cost and wasting too much construction period and without sacrificing the force system of the structure.

[0050] Before describing the specific embodiments of the present invention, it is helpful to define some specific terms.

[0051] ① Left end and right end

[0052] The main girder of the bridge body is erected on the bearings at both ends. For the sake of description, the bearing at the left end is called the "left-end bearing"; the bearing at the right end is called the "right-end bearing".

[0053] ② Front side and rear side

[0054] Taking the left-end bearing as an example, since it is a "bridge with double bearings at the beam ends", it includes two inherent bearings. For the sake of description, they are called the front-side inherent bearing and the rear-side inherent bearing.

[0055] Similarly, for the right-end bearing, it has two inherent bearings, namely the front-side inherent bearing and the rear-side inherent bearing. The right-end bearing does not set up temporary bearings.

[0056] ③ Inherent bearing and temporary bearing

[0057] For the inherent bearing, it remains after the bridge is built.

[0058] For the temporary bearing, it plays a temporary supporting role during the bridge construction process and is removed after the bridge is built.

[0059] To make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0060] The first aspect of the present invention provides a leveling method for bridge bearings with double bearings provided at the beam ends. Figure 1 It is a flow chart of the leveling method for bridge bearings with double bearings provided at the beam ends in an embodiment of the present invention. Figure 2A and Figure 2B For Figure 1 They are respectively the overall bearing top view and the left view of the left bearing group after implementing steps B and C in the leveling method for bridge bearings with double bearings provided at the beam ends as shown.

[0061] Figure 3A and Figure 3B They are respectively Figure 1 the overall bearing top view and the left view of the left bearing group after implementing step E in the leveling method for bridge bearings with double bearings provided at the beam ends as shown. Figure 4A and Figure 4B They are respectively Figure 1 the overall bearing top view and the left view of the left bearing group after implementing step F in the leveling method for bridge bearings with double bearings provided at the beam ends as shown.

[0062] In the following description and in the drawings, "h" represents the designed elevation of the bearing top surface, "d" represents the thickness of the bearing upper cushion stone, and "H" represents the elevation of the temporary bearing top surface.

[0063] The overall construction sequence of this embodiment is as follows: Set the permanent bearing and the temporary bearing at the left end. Set the permanent bearing at the right end within 8 hours before the hollow slab is in place. Remove the temporary bearing 24 hours after the hollow slab is in place to complete the bridge erection. Specifically, as Figure 1 shown, the leveling method for bridge bearings with double bearings provided at the beam ends in this embodiment includes:

[0064] Step A, respectively lay retarder mortar with a thickness of t1 above the lower cushion stones on both sides of the left end of the main beam of the bridge body.

[0065] Specifically, in this embodiment, the lower cushion stones are provided on the capping beam (or abutment). Mortar grooves are opened on the upper surface of the lower cushion stones, and 2-cm-thick epoxy mortar is laid in the mortar grooves. Among them, the mortar grooves match the shape of the permanent bearings, satisfying: 4 cm ≤ (S1 - S2) ≤ 8 cm, where S1 and S2 are respectively the horizontal expansion dimensions of the mortar grooves and the permanent bearings.

[0066] In this embodiment, the retarder mortar uses epoxy mortar, but the present invention is not limited thereto. In other embodiments of the present invention, high-strength polymer mortar and other mortars with the characteristics of slow solidification and finally complete solidification to achieve the supporting effect can also be used.

[0067] Step B: Install permanent bearings on both sides above the initial setting mortar at the left end. The elevation of the top surface of the permanent bearing is set to "h + t2", where h is the designed elevation of the top surface of the bearing and t2 is the compression allowance of the bearing; the lower bearing pad, the initial setting mortar, and the permanent bearing form an inherent bearing.

[0068] In this embodiment, the elevation of the top surface of the permanent bearing is controlled according to "h + 1 cm", which is adapted to the epoxy mortar thickness of 2 cm in the previous step. However, the present invention is not limited thereto. In other embodiments of the present invention, the thickness t1 of the initial setting mortar and the compression allowance t2 of the bearing can be designed according to actual needs. Generally, t1 > t2 ≥ 0.5 cm. Preferably, 1 cm ≤ t1 ≤ 3 cm; 0.5 cm ≤ t2 ≤ 2 cm; t1 > t2.

[0069] Step C: Install temporary bearings on the capping beam (or abutment) between the inherent bearings on both sides of the left end of the main beam of the bridge body. The elevation of the top surface of the temporary bearing is set to "h + d + Δ L ", where d is the thickness of the upper bearing pad of the bearing; Δ L is the deformation of the temporary bearing; and t2 > Δ L ;

[0070] Step D: Install permanent bearings directly above the lower bearing pads on both sides of the right end of the main beam of the bridge body; there is no initial setting mortar under the permanent bearings, and no temporary bearings are arranged between the permanent bearings on both sides.

[0071] Specifically, in this embodiment, as shown in Figure 2A and Figure 2B , the temporary bearing is located at the center of the left end of the hollow slab bridge body to ensure that the hollow slab bridge body does not overturn. The cross slope of the top surface of the temporary bearing is 0, and the longitudinal slope is the same as the longitudinal slope of the main beam of the permanent bearing.

[0072] It should be particularly noted that the elevation H of the top surface of the temporary bearing is controlled according to "h + d + Δ L ". The deformation Δ L of the temporary bearing satisfies:

[0073]

[0074] where t1 represents the expected working time of the temporary bearing, P represents the self-weight of one end of the main beam of the bridge body before the beam erection, A represents the effective stress area of the temporary bearing, E t represents the effective elastic modulus of the temporary bearing varying with time, and L represents the elevation of the temporary bearing, L = h + d + Δ L .

[0075] In this embodiment, t1 = 24h. After determining the elevation of the temporary support according to the above method, it can better adapt to the setting process of the retarder mortar, so that after the retarder mortar is completely solidified, the hollow slab bridge body can reach the design height more accurately.

[0076] In this embodiment, the temporary support is a sand box support, but the present invention is not limited thereto. In other embodiments of the present invention, other types of temporary supports such as sulfur supports can also be used. As long as it can realize the function of supporting the bridge body during the bridge erection process and is convenient to remove after the bridge erection is completed, it can be applied to the present invention and is also within the protection scope of the present invention.

[0077] In this embodiment, no retarder mortar is provided below the permanent support at the right end of the main beam of the bridge body, and no temporary support is provided between the two permanent supports on both sides either. However, the present invention is not limited thereto. In actual scenarios, retarder mortar can also be provided below the permanent support at the right end as needed, and a temporary support can be provided between the two permanent supports on both sides. These can also implement the present invention and are also within the protection scope of the present invention.

[0078] Step E, during the setting reaction state of the retarder mortar, the main beam of the bridge body is erected on the supports at the left and right ends, where:

[0079] (1) At the left end of the main beam of the bridge body

[0080] The central part presses on the temporary support, and both sides are closely attached to the permanent supports on both sides through the bearing pads on the supports. Among them, the permanent support adaptively descends in the retarder mortar in the setting reaction state under the gravity of the upper bridge body main beam.

[0081] (2) At the right end of the main beam of the bridge body

[0082] Permanent supports are directly installed above the lower bearing pads on both sides of the right end of the main beam of the bridge body. Both sides of the right end of the main beam of the bridge body are closely attached to the permanent supports on both sides through the bearing pads on the supports.

[0083] Specifically, in this embodiment, as Figure 3A and Figure 3B shown, within 8 hours after the installation of the epoxy mortar support, the hollow slab is erected on the temporary support, and the stress area of a single permanent support is 0.0625 cm 2 . The permanent support adaptively descends under the gravity of the hollow slab to ensure close contact between the permanent support and the upper bearing pad.

[0084] In this embodiment, the main beam of the bridge body is a hollow slab beam, but the present invention is not limited thereto. In other embodiments of the present invention, the main beam of the bridge body can also be a precast prestressed concrete box girder, etc., and the method of the present invention can also be applied.

[0085] Step F, after the retarder mortar is completely solidified, remove the temporary support.

[0086] Specifically, Figure 4A and Figure 4B As shown, in this embodiment, the temporary support is removed after the epoxy mortar under the permanent support forms 100% strength and no less than 24 hours after hoisting.

[0087] The following aspects need special attention when installing hollow slab bridges:

[0088] (1) Construction timing

[0089] Set up a permanent support at one end and a temporary support at the other end. Set up the temporary support at the other end within 8 hours before the hollow slab is in place. Remove the temporary support 24 hours after the hollow slab is in place. Install the hollow slab hole by hole in this order. During the transportation and lifting of prefabricated beams, effective measures should be taken to ensure the lateral stability of the hollow slab. After the beams are erected, the bridge deck reinforcement and the end cross beam reinforcement should be connected in time.

[0090] (2) Concrete pouring

[0091] Pour the wet joint concrete of the bridge deck and the end beam concrete. The concrete pouring sequence should be completed from the middle of the span to both ends at one time, and the end beams should not be poured first.

[0092] (3) Construction anti-collision guardrail

[0093] Note that the anti-collision guardrail must be constructed after the wet joint construction is completed and the strength reaches 85%, otherwise the overturning stability of the side beam must be verified.

[0094] (4) Continuous facilities for steel bars and bridge decks

[0095] Set up the leveling layer steel bars and bridge deck continuity facilities, and pour the leveling layer concrete to form a continuous bridge deck.

[0096] From the above description, it can be seen that the present invention solves the problem of hollowing of hollow slab beams with double supports at the ends of the beams by using thickness-adaptive slow-setting mortar and temporary supports without increasing too much cost, wasting too much construction time, and sacrificing the force-bearing system of the structure.

[0097] At this point, the leveling method of the bridge bearing with double bearings at the beam end of this embodiment has been introduced.

[0098] The second aspect of the present invention provides a bridge with double supports at both ends of the beam. The bridge with double supports at both ends is constructed by using the support leveling method of the bridge with double supports at both ends of the beam as described in the above embodiment.

[0099] The third invention of the present invention provides a bridge support with double supports at the end of a leveling beam. The bridge support with double supports at the end of a leveling beam is the intermediate state of the support in the leveling method of the bridge support with double supports at the end of a beam as in the above embodiment. Specifically, the bridge support with double supports at the end of a leveling beam is the left support of a hollow slab bridge.

[0100] During the construction process, please refer to Figure 2A and Figure 2B . In this embodiment, the bridge bearing leveling support with double bearings at the beam ends includes: the inherent bearings on both sides and the temporary bearing in the middle.

[0101] Among them, the inherent bearing includes: a lower cushion stone, on the upper surface of which there is a mortar groove; retarder mortar, laid in the mortar groove; and a permanent bearing, installed on the retarder mortar.

[0102] For the temporary bearing, in the initial laying state and / or the retardation reaction state of the retarder mortar, the temporary bearing is arranged between the inherent bearings on both sides, and its top elevation is set to "h + d + ΔL", where d is the thickness of the upper cushion stone of the bearing; Δ L is the deformation amount of the temporary bearing.

[0103] For the retarder mortar, as the exposure time in the air prolongs, its fluidity and deformability become worse and worse, and its hardness becomes greater and greater, and the height of the permanent bearing above the retarder mortar also gradually changes. Specifically:

[0104] (1) Initial laying state of the retarder mortar

[0105] In the initial laying state of the retarder mortar, its thickness is t1; the top elevation of the permanent bearing is set to "h + t2", where h is the designed elevation of the bearing top surface, t2 is the depression allowance of the bearing, t1 > t2 ≥ 0.5 cm,; and t2 > Δ L ;

[0106] (2) Retardation reaction state

[0107] In the retardation reaction state of the retarder mortar, the main beam of the bridge is erected on the inherent bearings and temporary bearings at the first end and the second end. Among them, the central part of the first end of the main beam of the bridge presses on the temporary bearing, and the two sides of the first end of the main beam of the bridge are respectively closely attached to the permanent bearings on both sides through the upper cushion stones of the bearings. The permanent bearings on both sides of the first end of the main beam of the bridge adaptively descend in the retarder mortar in the retardation reaction state under the gravity of the upper bridge main beam;

[0108] (3) Final setting state

[0109] In the final setting state of the retarder mortar, the top elevation of the permanent bearing is "h". The temporary bearing is removed.

[0110] After the bridge construction is completed, please refer to Figure 4A and Figure 4B . In this embodiment, the bridge bearing leveling support with double bearings at the ends includes: the inherent bearings on both sides. The inherent bearing includes: a lower cushion stone, on the upper surface of which there is a mortar groove; retarder mortar, laid in the mortar groove; and a permanent bearing, installed on the retarder mortar.

[0111] Those skilled in the art should understand that after the construction is completed, the temporary bearings are removed, but the permanent bearings fixed in the retarder mortar can still be significantly identified.

[0112] After the construction is completed, please refer to Figure 4A and Figure 4B , in this embodiment, the bridge bearing leveling bearing with double bearings at the beam ends includes: inherent bearings on both sides. In other words, the intermediate temporary bearing has been removed.

[0113] Among them, the inherent bearing includes: a lower cushion stone, on the upper surface of which a mortar groove is provided; a retarder mortar, laid in the mortar groove; and a permanent bearing, installed on the retarder mortar.

[0114] So far, the various embodiments of the present invention have been introduced. Based on the above description, those skilled in the art should have a clear understanding of the present invention.

[0115] It should be noted that for some implementation manners, if they are not the key content of the present invention and are well-known to those of ordinary skill in the art, due to space limitations, they are not described in detail in the specification drawings or the text. In this case, reference can be made to the relevant prior art for understanding.

[0116] For the numerical values and numerical ranges mentioned in the present invention, unless clearly indicated to the contrary, the numerical parameters in the specification and claims of the present invention can be approximate values and can be changed according to the content of the present invention. Specifically, all the numbers representing the contents of the components, reaction conditions, etc. recorded in the specification and claims should be understood to be modified by the term "about" in all cases, and the meaning expressed is that it includes a change of ±10% of a specific quantity in some embodiments.

[0117] For the directional terms mentioned in the present invention, such as "left", "right", "front", "rear", "inner", "outer", etc., the indicated orientation or positional relationship is only based on the orientation or positional relationship shown in the drawings, and is 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, so it cannot be understood as a limitation to the present invention. And throughout the drawings, the same elements are represented by the same or similar reference numerals. And the shapes and sizes of the components in the drawings do not reflect the actual size and proportion, but only illustrate the content of the embodiments of the present invention.

[0118] Those skilled in the art should understand that in the claims and the specification of the present invention, the word "comprising" does not exclude the existence of elements (or steps) not listed in the claims. The word "a" or "an" before an element (or step) does not exclude the existence of multiple such elements (or steps).

[0119] Moreover, the purpose of providing the above embodiments is only to enable the present invention to meet legal requirements, and the present invention can be implemented in many different forms and should not be construed as limited to the embodiments set forth herein.

[0120] Similarly, it should be understood that, in order to streamline the present invention, in the above description of the exemplary embodiments of the present invention, various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, the method of the present invention should not be construed as reflecting the intention that the claimed invention requires more features than those expressly recited in each claim. Rather, as reflected in the claims, each inventive aspect lies in less than all the features of the preceding single embodiment. Also, the embodiments may be used in combination with each other or with other embodiments based on considerations of design and reliability, that is, the technical features in different embodiments can be freely combined to form more embodiments. Therefore, the claims following the specific implementation are hereby expressly incorporated into the specific implementation, where each claim itself is a separate embodiment of the present invention.

[0121] In the above specific embodiments, the purpose, technical means and beneficial effects of the present invention have been described in detail. It should be understood that the purpose of the detailed description is for those skilled in the art to understand the present invention more clearly and is not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A leveling method for a bridge support with double supports at the end of a beam, characterized in that: include: Step A, laying slow-setting mortar with a thickness of t1 on the upper side of the lower cushion stones on both sides of the first end of the main beam of the bridge body; Step B, respectively installing permanent supports above the slow-setting mortar on both sides of the first end, the top surface elevation of the permanent supports is set to "h+t2", where h is the design elevation of the top surface of the support, t2 is the downward pressure margin of the support, t1>t2≥0.5cm; the lower cushion stone, slow-setting mortar, and permanent supports constitute an inherent support; Step C: a temporary support is set between the inherent supports on both sides of the first end of the bridge main beam, and the top surface elevation of the temporary support is set to "h+d+Δ L ”, where d is the thickness of the pad stone on the support; Δ L is the deformation of the temporary support; and t2>Δ L ; Step E, in the slow setting reaction state of the slow setting mortar, erecting the bridge main beam on the inherent supports and temporary supports at the first end and the second end, wherein the central part of the first end of the bridge main beam is pressed on the temporary support, and both sides of the first end of the bridge main beam are respectively closely attached to the permanent supports on both sides through the pad stones on the supports, and the permanent supports on both sides of the first end of the bridge main beam adaptively descend in the slow setting mortar in the slow setting reaction state under the action of the gravity of the upper bridge main beam; Step F, after the slow-setting mortar is completely solidified, remove the temporary support.

2. The leveling method of the bridge bearing with double bearings at the beam end according to claim 1 is characterized in that: In step A, the slow-setting mortar is one of the following: epoxy mortar, high-strength polymer mortar; In the step E, the main beam of the bridge body is erected on the inherent supports at the first end and the second end within 8 hours after the slow-setting mortar is laid; In step F, the temporary supports are removed 24 hours after the main beams of the bridge are erected.

3. The leveling method of a bridge support with double supports at the beam end according to claim 1 is characterized in that: In step C, the deformation of the temporary support Δ L satisfy: Among them, t1 represents the expected working time of the temporary support, P represents the deadweight of one end of the bridge main beam before the beam is erected, A represents the effective load-bearing area of ​​the temporary support, and E t It represents the effective elastic modulus of the temporary support changing with time, L represents the elevation of the temporary support, L=h+d+Δ L .

4. The leveling method of a bridge support with double supports at the beam end according to claim 1 is characterized in that: The mortar is epoxy mortar; the bearing area of ​​a single permanent support is 0.0625cm 2 ; And / or, in step A, mortar grooves are opened on the upper surfaces of the lower cushion stones on both sides of the first end of the main beam of the bridge body; the mortar grooves match the shape of the permanent bearing and satisfy: 4cm≤(S1-S2)≤8cm, wherein S1 and S2 are the lateral expansion dimensions of the mortar groove and the permanent bearing, respectively.

5. The leveling method of a bridge bearing with double bearings at the beam end according to any one of claims 1 to 4, characterized in that: The temporary support is one of the following: a sand box support, a sulfur support; And / or, the main beam of the bridge body is: a hollow slab beam, an assembled prestressed concrete box beam; And / or, before step E, the method further includes: step D, directly installing permanent bearings above the lower cushion stones on both sides of the second end of the bridge body; And / or, the lower cushion stone and temporary support are arranged on the cap beam or the abutment.

6. A bridge support with double supports at the end of the beam, characterized in that: include: The inherent supports on both sides include: a lower cushion stone having a mortar groove formed on its upper surface; Slow-setting mortar, laid in the mortar groove; The permanent support is installed on the slow-setting mortar.

7. The bridge bearing with double bearings at the beam end according to claim 6 is characterized in that: In the initial spreading state and / or the slow setting reaction state of the slow setting mortar, the double-support bridge bearing at the beam end further comprises: a temporary bearing; In the initial paving state of the slow-setting mortar, the temporary support is set between the inherent supports on both sides, and its top surface elevation is set to "h+d+Δ L ”, where d is the thickness of the pad stone on the support; Δ L is the deformation of the temporary support; Wherein, in the slow setting reaction state of the slow setting mortar, the bridge main beam is erected on the inherent supports and temporary supports at the first end and the second end, wherein the central part of the first end of the bridge main beam is pressed on the temporary support, and both sides of the first end of the bridge main beam are respectively closely attached to the permanent supports on both sides through the pad stones on the supports, and the permanent supports on both sides of the first end of the bridge main beam adaptively descend in the slow setting mortar in the slow setting reaction state under the gravity of the upper bridge main beam; In which, the temporary support is removed when the slow-setting mortar is in the final setting state.

8. The bridge bearing with double bearings at the beam end according to claim 7 is characterized in that: In the initial paving state of the slow-setting mortar, its thickness is t1; the top elevation of the permanent support is set to "h+t2", where h is the design elevation of the top surface of the support, t2 is the support downward pressure margin, t1>t2≥0.5cm; and t2>Δ L ; In the final setting state of the slow-setting mortar, the top surface elevation of the permanent support is "h".

9. The bridge bearing with double bearings at the beam end according to claim 7, characterized in that: The slow-setting mortar is one of the following: epoxy mortar, high-strength polymer mortar; And / or, the temporary support is one of the following: a sand box, a sulfur support; And / or, the main beam of the bridge installed above the double-support bridge is: a hollow slab beam, an assembled prestressed concrete box beam; and / or, 1cm≤t1≤3cm; 0.5cm≤t2≤2cm; t1>t2; And / or, the shape of the mortar groove matches that of the permanent support, satisfying: 4cm≤(S1-S2)≤8cm, wherein S1 and S2 are the horizontal expansion dimensions of the mortar groove and the permanent support, respectively; and / or, deformation of the temporary support Δ L satisfy: Among them, t1 represents the expected working time of the temporary support, P represents the weight of one end of the bridge main beam before the beam is erected, A represents the effective load-bearing area of ​​the temporary support, and E t It represents the effective elastic modulus of the temporary support changing with time, L represents the elevation of the temporary support, L=h+d+Δ L .

10. A bridge with double supports at the beam ends, characterized in that: The bridge is constructed by using the method of providing a double-support bridge support at the end of a leveling beam as described in any one of claims 1 to 5.

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