Bridge support with double supports at beam ends and leveling method thereof, bridge with double supports at beam ends

Abstract

The present application relates to the field of bridge construction, especially a kind of bridge support with double supports at beam end, its leveling method and bridge with double supports at beam end.The leveling method of the bridge support with double supports at beam end of the present application includes: step A, laying the retarder mortar with thickness t1 above the abutment stone on both sides of the first end of the bridge body main beam;Step B, installing permanent support above the retarder mortar on both sides of the first end;Step C, setting temporary support between inherent support on both sides of the first end of the bridge body main beam;Step E, erecting the bridge body main beam on the inherent support and temporary support of the first end and the second end in the retarder reaction state of the retarder mortar, wherein the permanent support on both sides is self-adaptingly lowered in the retarder mortar in the retarder reaction state under the gravity of the upper bridge body main beam;Step F, removing the temporary support after the retarder mortar is completely solidified.The present application solves the problem of hollow slab beam disengaging of the bridge with double supports at beam end by the retarder mortar with self-adapting thickness and temporary support.

Description

Technical Field

[0001] This invention relates to the field of bridge construction, and in particular to a bridge bearing with double supports at the beam end and its leveling method, and a bridge with double supports at the beam end. Background Technology

[0002] Currently, many hollow slab bridges with double supports at the beam ends in China are experiencing the problem of supports becoming detached. This detachment causes varying degrees of damage to the supports, precast beams, and bridge deck during operation, affecting the stress and durability of the bridge structure, and in severe cases, even the safety of the bridge.

[0003] To avoid support failure during construction, existing technologies require the following measures:

[0004] (a) Before installing the support, re-measure the elevation of the top of the pad stone to ensure that the elevation of the pad stone during construction is consistent with the design. If there is a discrepancy, repair measures must be taken.

[0005] (b) It is required that after the precast beam is hoisted and during the final acceptance inspection, the bottom support of the beam be checked for detachment, and the detached support be shimmed.

[0006] However, the above measures are only remedial measures for the situation of the support coming loose. On the one hand, they are costly, and on the other hand, similar problems are likely to occur again after repair. Summary of the Invention

[0007] I. Technical problems to be solved

[0008] The present invention aims to at least partially solve one of the above-mentioned technical problems.

[0009] II. Technical Solution

[0010] The first aspect of this invention provides a leveling method for bridge bearings with double supports at the beam ends. This leveling method for bridge bearings with double supports at the beam ends includes:

[0011] Step A: Lay a layer of slow-setting mortar with a thickness of t1 on top of the lower pad stones on both sides of the first end of the main beam of the bridge.

[0012] Step B: Install permanent supports on top of the slow-setting mortar on both sides of the first end. The top surface elevation of the permanent support is set as "h+t2", where h is the design elevation of the top surface of the support, t2 is the bearing allowance, and t1>t2≥0.5cm. The underlying stone, slow-setting mortar, and permanent support constitute the inherent support.

[0013] Step C: Install temporary supports between the inherent supports on both sides of the first end of the main beam of the bridge. The elevation of the top surface of the temporary supports is set as "h+d+Δ". L ", where d is the thickness of the bearing pad; Δ LThe deformation of the temporary support; and t2>Δ L ;

[0014] Step E: In the retarded reaction state of the retarded mortar, the main beam of the bridge is erected on the inherent and temporary supports at the first and second ends. The central part of the first end of the main beam of the bridge rests on the temporary support, and the two sides of the first end of the main beam of the bridge are respectively attached to the permanent supports on both sides by the bearing pads. Under the gravity of the main beam of the bridge above, the permanent supports on both sides of the first end of the main beam of the bridge self-adaptively descend in the retarded mortar in the retarded reaction state.

[0015] Step F: After the retarded mortar has completely hardened, remove the temporary support.

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

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

[0018]

[0019] Where t1 represents the expected working time of the temporary support, P represents the self-weight of the main girder at one end before girder erection, A represents the effective bearing area of ​​the temporary support, and E... t L represents the effective elastic modulus of the temporary support as a function of time, and L represents the elevation of the temporary support. L = h + d + Δ L .

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

[0021] In some embodiments of the present invention, in step A, mortar grooves are formed on the upper surface of the lower pad stones on both sides of the first end of the main beam of the bridge; the shape of the mortar grooves matches the shape of the permanent support, satisfying: 4cm≤(S1-S2)≤8cm, where S1 and S2 are the lateral expansion dimensions of the mortar grooves and the permanent support, respectively.

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

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

[0024] In some embodiments of the present invention, step D is included before step E: a permanent support is directly installed above the lower bearing stones on both sides of the second end of the bridge body.

[0025] In some embodiments of the present invention, the underlay stone and temporary support are provided on the cap beam or bridge abutment.

[0026] A second aspect of the present invention provides a bridge bearing with double supports at the beam end. The bridge bearing with double supports at the beam end includes: inherent supports on both sides, each inherent support including: a lower pad stone with a mortar groove on its upper surface; retarding mortar laid in the mortar groove; and a permanent support installed on the retarding mortar.

[0027] In some embodiments of the present invention, in the initial laying state and / or the retarding reaction state of the mortar, the double-support bridge bearing at the beam end further includes: a temporary bearing; wherein, in the initial laying state of the mortar, the temporary bearing is disposed between the two inherent bearings, and its top surface elevation is set as "h+d+Δ". L ", where d is the thickness of the bearing pad; Δ L The deformation of the temporary support; and t2>Δ L During the retarding reaction state of the retarding mortar, the main beam of the bridge is erected on the inherent and temporary supports at the first and second ends. The central part of the first end of the main beam rests on the temporary support, and the two sides of the first end of the main beam are respectively attached to the permanent supports on both sides by bearing pads. The permanent supports on both sides of the first end of the main beam descend adaptively in the retarding mortar during the retarding reaction state under the gravity of the main beam above. During the final setting state of the retarding mortar, the temporary support is removed.

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

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

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

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

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

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

[0034] In some embodiments of the present invention, the deformation Δ of the temporary support L satisfy:

[0035]

[0036] Where t1 represents the expected working time of the temporary support, P represents the weight of the main girder at one end before girder erection, A represents the effective bearing area of ​​the temporary support, and E... t L represents the effective elastic modulus of the temporary support as a function of time, and L represents the elevation of the temporary support. L = h + d + Δ L .

[0037] A third aspect of the present invention provides a bridge with double supports at the beam ends. This bridge with double supports at the beam ends is constructed using the method described above for leveling the bridge supports with double supports at the beam ends.

[0038] III. Beneficial Effects

[0039] (1) This invention solves the problem of hollow slab beams with double supports at the beam ends by using thickness-adaptive slow-setting mortar and temporary supports without increasing costs or wasting too much construction time, and without sacrificing the structural stress system.

[0040] (2) The elevation H of the top surface of the temporary support is controlled according to "h+d+△L". After determining the elevation of the temporary support in the above manner, it can better adapt to the slow setting process of the slow setting mortar, so that after the slow setting mortar is completely solidified, the hollow slab bridge body can reach the design height more accurately. Attached Figure Description

[0041] Figure 1 This is a flowchart of a bridge bearing leveling method with double supports at the beam end, according to an embodiment of the present invention.

[0042] Figure 2A and Figure 2B for Figure 1 The diagram shows the overall support top view and the left view of the left end support group after steps B and C in the bridge support leveling method with double supports at the beam ends.

[0043] Figure 3A and Figure 3B They are respectively Figure 1 The diagram shows the overall support top view and the left view of the left end support group after step E in the bridge support leveling method with double supports at the beam ends.

[0044] Figure 4Aand Figure 4B They are respectively Figure 1 The diagram shows the overall support top view and the left view of the left end support group after step F in the bridge support leveling method with double supports at the beam ends. Detailed Implementation

[0045] As mentioned earlier, hollow slab bridge bearings with double supports at the beam ends are prone to uneven stress distribution among supports under the same beam, or even individual supports being unloaded, during use. The applicant has conducted an in-depth analysis of the causes of these problems and summarized them as follows:

[0046] ① Hollow slabs or small box girders corresponding to plate supports are generally installed one by one and then connected into one piece. The weight difference of the individual beams will cause uneven stress on the support.

[0047] ② Differences in the vertical stiffness of each support will cause uneven stress on the support;

[0048] ③ Construction errors cannot guarantee that all four supports can be completely and tightly fitted to the bottom of the beam.

[0049] In summary, the problems stem from both structural and construction issues. This invention aims to solve the problem of hollow slab beams with double supports at the beam ends becoming detached without significantly increasing costs, wasting time, or sacrificing the structural load-bearing system.

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

[0051] ①Left end and right end

[0052] The main beams of the bridge are erected on supports at both ends. For ease of description, the support at the left end is called the "left end support" and the support at the right end is called the "right end support".

[0053] ② Front and rear sides

[0054] Taking the left end support as an example, since it is a "bridge with double supports at the beam end", it includes two inherent supports, which are referred to as the front inherent support and the rear inherent support for ease of description.

[0055] Similarly, the right-end support has two inherent supports: a front inherent support and a rear inherent support. No temporary supports are provided for the right-end support.

[0056] ③Inherent supports and temporary supports

[0057] For inherent supports, they are retained after the bridge is built.

[0058] Temporary supports serve as temporary supports during bridge construction and are removed after the bridge is completed.

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

[0060] The first aspect of the present invention provides a leveling method for bridge supports with double supports at the beam end. Figure 1 This is a flowchart of a bridge bearing leveling method with double supports at the beam end, according to an embodiment of the present invention. Figure 2A and Figure 2B for Figure 1 The diagram shows the overall support top view and the left view of the left end support group after steps B and C in the bridge support leveling method with double supports at the beam ends.

[0061] Figure 3A and Figure 3B They are respectively Figure 1 The diagram shows the overall support top view and the left view of the left end support group after step E in the bridge support leveling method with double supports at the beam ends. Figure 4A and Figure 4B They are respectively Figure 1 The diagram shows the overall support top view and the left view of the left end support group after step F in the bridge support leveling method with double supports at the beam ends.

[0062] In the following descriptions and figures, “h” represents the design elevation of the top surface of the support, “d” represents the thickness of the pad stone on the support, and “H” represents the elevation of the top surface of the temporary support.

[0063] The overall construction sequence in this embodiment is as follows: permanent and temporary supports are installed on the left end; permanent supports are installed on the right end within 8 hours before the hollow slab is placed; temporary supports are removed 24 hours after the hollow slab is placed, thus completing the bridge erection. Specifically, as follows... Figure 1 As shown, the leveling method for bridge supports with double supports at the beam end in this embodiment includes:

[0064] Step A: Lay a layer of slow-setting mortar with a thickness of t1 on top of the lower pad stones on both sides of the left end of the main beam of the bridge.

[0065] Specifically, in this embodiment, the lower bearing stone is placed on the cap beam (or abutment). A mortar groove is formed on the upper surface of the lower bearing stone, and a 2cm thick epoxy mortar is laid in the mortar groove. The shape of the mortar groove matches that of the permanent support, satisfying: 4cm≤(S1-S2)≤8cm, where S1 and S2 are the horizontal expansion dimensions of the mortar groove and the permanent support, respectively.

[0066] In this embodiment, epoxy mortar is used as the retarding mortar, but the present invention is not limited thereto. In other embodiments of the present invention, high-strength polymer mortar or other mortars with slow setting and eventual complete setting to achieve a supporting function can also be used.

[0067] Step B: Install permanent supports on the left side above the slow-setting mortar. The top surface elevation of the permanent support is set as "h+t2", where h is the design elevation of the top surface of the support and t2 is the bearing allowance. The pad stone, slow-setting mortar and permanent support constitute the inherent support.

[0068] In this embodiment, the elevation of the top surface of the permanent support is controlled according to "h+1cm", which is consistent with the previous epoxy mortar thickness of 2cm, but the present invention is not limited to this. In other embodiments of the present invention, the thickness of the retarding mortar t1 and the bearing under-pressure margin t2 can be designed according to actual needs. Generally, t1>t2≥0.5cm. Preferably, 1cm≤t1≤3cm; 0.5cm≤t2≤2cm; t1>t2.

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

[0070] Step D: Install permanent bearings directly above the lower pad stones on both sides of the right end of the main beam of the bridge; wherein, no retarding mortar is set under the permanent bearings, and no temporary bearings are set between the two permanent bearings.

[0071] Specifically, in this embodiment, as Figure 2A and Figure 2B As shown, the temporary support 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 top surface of the temporary support has a zero cross slope and its longitudinal slope is consistent with that of the main beam of the permanent support.

[0072] It is particularly important to note that the elevation H of the top surface of the temporary support is determined according to the formula "h + d + Δ". L "Control. Deformation Δ of temporary support" L satisfy:

[0073]

[0074] Where t1 represents the expected working time of the temporary support, P represents the self-weight of the main girder at one end before girder erection, A represents the effective bearing area of ​​the temporary support, and E... t L represents the effective elastic modulus of the temporary support as a function of time, and L represents the elevation of the temporary support. L = h + d + Δ L .

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

[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, may also be used. As long as the support functions to support the bridge structure during the bridge erection process and is easily removable after the bridge erection is completed, it can be applied to the present invention and is also within the scope of protection of the present invention.

[0077] In this embodiment, no retarding mortar is installed below the permanent support at the right end of the main beam of the bridge, and no temporary support is installed between the two permanent supports. However, this invention is not limited to this. In practical scenarios, retarding mortar can be installed below the permanent support at the right end, and temporary supports can be installed between the two permanent supports, as needed. These can also achieve the present invention and are within the scope of protection of this invention.

[0078] Step E: While the retarding mortar is in a retarded state, the main beam of the bridge is erected on the supports at the left and right ends, wherein:

[0079] (1) Left end of the main beam of the bridge

[0080] The central section rests on temporary supports, while the two sides are tightly attached to permanent supports via bearing pads. The permanent supports, under the weight of the main bridge beam above, adaptively descend within the slow-setting mortar in a retarded state.

[0081] (2) Right end of the main beam of the bridge

[0082] Permanent bearings are installed directly above the lower bearing stones on both sides of the right end of the main girder. The upper bearing stones on both sides of the right end of the main girder are then closely attached to the permanent bearings on both sides.

[0083] Specifically, in this embodiment, as Figure 3A and Figure 3B As shown, a hollow slab was erected on the temporary support within 8 hours after the epoxy mortar support was installed. The bearing area of ​​a single permanent support is 0.0625 cm². 2 The permanent support descends adaptively under the gravity of the hollow slab, ensuring close contact between the permanent support and the upper pad stone.

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

[0085] Step F: After the retarded mortar has completely hardened, remove the temporary support.

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

[0087] The following aspects require special attention during the installation of 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 placed. Remove the temporary support 24 hours after the hollow slab is placed. Install the hollow slabs one hole at a time in this order. During the transportation and lifting of the precast beams, take effective measures to ensure the lateral stability of the hollow slabs. After the beams are erected, connect the bridge deck reinforcement and the end crossbeam reinforcement in a timely manner.

[0090] (2) Concrete pouring

[0091] Pour the concrete for the wet joints of the bridge deck and the end crossbeams. The concrete pouring sequence should be completed in one go from the mid-span to both ends; the end crossbeams should not be poured first.

[0092] (3) Construction crash barriers

[0093] Note that crash barriers must be installed only after the wet joint construction is completed and the strength reaches 85%; otherwise, the overturning stability of the side beams must be verified.

[0094] (4) Reinforcing steel and continuous bridge deck facilities

[0095] After setting up the leveling layer reinforcement and bridge deck continuity facilities, the leveling layer concrete is poured to form a continuous bridge deck.

[0096] As can be seen from the above description, the present invention solves the problem of hollow slab beams with double supports at the beam ends by using thickness-adaptive slow-setting mortar and temporary supports without increasing costs or wasting too much construction time, and without sacrificing the structural stress system.

[0097] This concludes the introduction to the bridge bearing leveling method with double supports at the beam end in this embodiment.

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

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

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

[0101] The inherent support includes: a lower pad stone with a mortar groove on its upper surface; a retarding mortar laid in the mortar groove; and a permanent support installed on the retarding mortar.

[0102] For temporary supports, in the initial laying state and / or retarding reaction state of the mortar, the temporary support is set between the two inherent supports, and its top surface elevation is set as "h+d+△L", where d is the thickness of the pad stone on the support; △ L This represents the deformation of the temporary support.

[0103] For retarded mortar, its fluidity and deformability decrease while its hardness increases with prolonged exposure to air, and the height of permanent supports on top of the retarded mortar also gradually changes. Specifically:

[0104] (1) Initial laying state of retarded mortar

[0105] In the initial stage of the slow-setting mortar, its thickness is t1; the top surface elevation of the permanent support is set as "h+t2", where h is the design elevation of the top surface of the support, t2 is the bearing allowance, t1>t2≥0.5cm, and t2>Δ L ;

[0106] (2) Retarding reaction state

[0107] In the retarded reaction state of the retarded mortar, the main beam of the bridge is erected on the inherent and temporary supports at the first and second ends. The central part of the first end of the main beam of the bridge rests on the temporary support, and the two sides of the first end of the main beam of the bridge are respectively attached to the permanent supports on both sides by the bearing pads. Under the gravity of the main beam of the bridge above, the permanent supports on both sides of the first end of the main beam of the bridge self-adaptively descend in the retarded mortar in the retarded reaction state.

[0108] (3) Final setting state

[0109] At the final setting state of the retarded mortar, the elevation of the top surface of the permanent support is "h". The temporary support is removed.

[0110] After the bridge construction is completed, please refer to Figure 4A and Figure 4B This embodiment of the bridge bearing leveling bearing with double supports at both ends includes: inherent supports on both sides. Each inherent support includes: a lower pad stone with a mortar groove on its upper surface; retarding mortar laid in the mortar groove; and a permanent support installed on the retarding mortar.

[0111] Those skilled in the art will understand that, after construction is completed, temporary supports are removed, but permanent supports fixed within the retarded mortar remain clearly identifiable.

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

[0113] The inherent support includes: a lower pad stone with a mortar groove on its upper surface; a retarding mortar laid in the mortar groove; and a permanent support installed on the retarding mortar.

[0114] This concludes the description of the various embodiments of the present invention. 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 certain implementation methods, if they are not the key content of this invention and are well known to those skilled in the art, they are not described in detail in the accompanying drawings or text due to space limitations. In such cases, they can be understood by referring to the relevant prior art.

[0116] Unless explicitly stated otherwise, the numerical values ​​and ranges mentioned in this invention are approximate and can be changed according to the content of this invention. Specifically, all figures in the specification and claims indicating the content of composition, reaction conditions, etc., should be understood to be modified by the term "about" in all cases, meaning that they include variations of ±10% in certain embodiments.

[0117] The directional terms used in this invention, such as "left," "right," "front," "back," "inner," and "outer," indicate only the orientation or positional relationship shown in the accompanying drawings. They are used solely for the purpose of facilitating and simplifying the description of the invention, and do not imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, throughout the accompanying drawings, the same elements are represented by the same or similar reference numerals. Also, the shapes and dimensions of the components in the drawings do not reflect actual size and proportion, but are only illustrative of embodiments of the invention.

[0118] Those skilled in the art will understand that in the claims and specification of this invention, the word "comprising" does not exclude the presence of elements (or steps) not listed in the claims. The word "a" or "an" preceding an element (or step) does not exclude the presence of a plurality of such elements (or steps).

[0119] Furthermore, the above embodiments are provided only to enable the invention to meet legal requirements, and the 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, for the sake of brevity, in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof. However, this method of invention should not be construed as reflecting an intention that the claimed invention requires more features than expressly recited in each claim. Rather, as reflected in the claims, the various inventive aspects consist of fewer than all the features of the preceding single embodiment. Furthermore, embodiments may be used in combination with each other or with other embodiments based on design and reliability considerations; that is, technical features from different embodiments can be freely combined to form more embodiments. Therefore, the claims following the detailed description are hereby expressly incorporated into that detailed description, wherein each claim itself is a separate embodiment of the invention.

[0121] The above specific embodiments have provided a detailed description of the purpose, technical means, and beneficial effects of the present invention. It should be understood that the purpose of the detailed description is to enable those skilled in the art to better understand the present invention, and it is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for leveling bridge supports with double supports at the beam ends, characterized in that, include: Step A: Lay a layer of slow-setting mortar with a thickness of t1 on top of the lower pad stones on both sides of the first end of the main beam of the bridge. Step B: Install permanent supports on top of the slow-setting mortar on both sides of the first end. The top surface elevation of the permanent support is set as "h+t2", where h is the design elevation of the top surface of the support, t2 is the bearing allowance, and t1>t2≥0.5cm. The lower pad stone, slow-setting mortar, and permanent support constitute the inherent support. Step C: Install temporary supports between the inherent supports on both sides of the first end of the main beam of the bridge. The top surface elevation of these temporary supports is set to " ", where d is the thickness of the pad stone on the support; This is the deformation of the temporary support; and ; Step E: In the retarded reaction state of the retarded mortar, the main beam of the bridge is erected on the inherent and temporary supports at the first and second ends. The central part of the first end of the main beam of the bridge rests on the temporary support, and the two sides of the first end of the main beam of the bridge are respectively attached to the permanent supports on both sides by the bearing pads. Under the gravity of the main beam of the bridge above, the permanent supports on both sides of the first end of the main beam of the bridge self-adaptively descend in the retarded mortar in the retarded reaction state. Step F: After the retarded mortar has completely hardened, remove the temporary support.

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

3. The leveling method for bridge supports with double supports at the beam end according to claim 1, characterized in that, In step C, the deformation of the temporary support satisfy: ； in, Indicates the expected working time of the temporary support. This indicates the self-weight of the main girder of the bridge before its erection. This indicates the effective bearing area of ​​the temporary support. This represents the effective elastic modulus of the temporary support as it changes over time. Indicates the elevation of the temporary support. .

4. The leveling method for bridge supports with double supports at the beam end according to claim 1, characterized in that, The mortar is epoxy mortar; the bearing area of ​​a single permanent support is 0.0625 cm². 2 ; And / or, in step A, mortar grooves are provided on the upper surface of the lower pad stones on both sides of the first end of the main beam of the bridge; the shape of the mortar grooves matches the permanent support, satisfying: 4cm≤(S1-S2)≤8cm, where S1 and S2 are the lateral expansion dimensions of the mortar grooves and the permanent support, respectively.

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

6. A bridge bearing with double supports at the beam end, characterized in that, include: The inherent supports on both sides include: The lower pad stone has mortar grooves on its upper surface; Retarding mortar is laid in the mortar groove; Permanent supports are installed on the retarding mortar; In the initial laying state and / or the retarding reaction state of the mortar, the double-support bridge bearing at the beam end also includes: a temporary bearing; In the initial stage of the retarded mortar, the temporary support is positioned between the two existing supports, and its top surface elevation is set to " ", where d is the thickness of the pad stone on the support; This represents the deformation of the temporary support; In the process of slowing down the mortar in a slowing reaction state, the main beam of the bridge is erected on the inherent and temporary supports at the first and second ends. The central part of the first end of the main beam is pressed on the temporary support, and the two sides of the first end of the main beam are respectively attached to the permanent supports on both sides by bearing pads. Under the gravity of the main beam above, the permanent supports on both sides of the first end of the main beam adaptively descend in the slowing mortar in a slowing reaction state. The temporary support was removed when the retarded mortar reached its final set state. In the initial stage of the slow-setting mortar, its thickness is t1; the top surface elevation of the permanent support is set as "h+t2", where h is the design elevation of the top surface of the support, t2 is the bearing allowance, t1>t2≥0.5cm; and t2> In the final setting state of the slow-setting mortar, the elevation of the top surface of the permanent support is "h".

7. The bridge bearing with double supports at the beam end as described in claim 6, characterized in that, The retarding mortar is one of the following: epoxy mortar or high-strength polymer mortar; And / or, the temporary support is one of the following: a sand box, a sulfur support; And / or, the main beams installed above the double-supported bridge are: hollow slab beams or precast prestressed concrete box girders; And / or, 1cm≤t1≤3cm; 0.5cm≤t2≤2cm; t1>t2; And / or, the mortar groove matches the shape of the permanent support, satisfying: 4cm≤(S1-S2)≤8cm, where S1 and S2 are the horizontal extension dimensions of the mortar groove and the permanent support, respectively; And / or, the deformation of the temporary support satisfy: ； in, Indicates the expected working time of the temporary support. This indicates the weight of the main girder at one end before it is erected. This indicates the effective bearing area of ​​the temporary support. This represents the effective elastic modulus of the temporary support as it changes over time. Indicates the elevation of the temporary support. .

8. A bridge with double supports at both ends of the beam, characterized in that, The bridge is constructed using the leveling method described in any one of claims 1 to 5, which involves providing double-supported bridge bearings at the beam ends.

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