Prefabricated block frame type bridge abutment for abrupt slope section of mountainous area

Abstract

The utility model provides a prefabricated block frame type bridge abutment for a mountain abrupt slope section, which comprises a prefabricated cover plate structure, a first supporting structure and a second supporting structure, the first supporting structure and the second supporting structure are arranged along the longitudinal direction of a bridge at intervals, and the prefabricated cover plate structure comprises a plurality of block prefabricated cover plates which are arranged along the transverse direction of the bridge at intervals. The block prefabricated cover plates extend in the longitudinal direction of the bridge, the two ends of each block prefabricated cover plate are fixed to the top of the first supporting structure and the top of the second supporting structure correspondingly, and a breaking joint is reserved between every two adjacent block prefabricated cover plates. Therefore, the problems that an existing integral cast-in-place frame table is complex and difficult to construct, high in risk and long in construction period are solved by adopting the structure assembled and constructed by the prefabricated cover plate structures; and each block prefabricated cover plate is arranged to extend in the longitudinal direction of the bridge so as to enlarge the aspect ratio, so that the stress of a bidirectional plate is simplified into the stress of a unidirectional plate, the stress mode of the cover plate is simplified, only longitudinal stress main ribs need to be arranged, engineering materials are saved, and the engineering cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge engineering, in particular to a precast segmented frame type abutment for mountainous steep slopes. Background Technique

[0002] With the gradual extension of China's expressways to mountainous areas, the abutments of expressway bridges often need to be set on relatively steep slopes. The design of abutments in steep slope sections has become a key and difficult point in the design of mountainous expressway bridges. The mountainous terrain is steep and the ground elevation difference is large. If a light abutment with a relatively small anti-pushing stiffness is directly adopted in the steep slope section, there are great potential safety hazards; if an additional span is added to make the bridge enter the cutting area, although this scheme is relatively safe and stable, most of the additional span enters the excavation area, resulting in a large amount of excavation and being uneconomical. If a gravity type abutment is adopted, in order to ensure the safety and stability of the abutment structure, the gravity type abutment often has a large buried depth and a large overall size, resulting in a large amount of excavation and damage to the mountain body, and at the same time increasing additional protection projects.

[0003] At present, a relatively common scheme is an integral cast-in-place frame type abutment. This kind of abutment is connected by a piece of integral cast-in-place slab between the front and rear column type abutments, thus forming a frame structure, which can flexibly adapt to the mountainous steep slope terrain, avoid large-scale excavation, and has good overall stability and economy.

[0004] However, since the abutment cover plate of this kind of abutment adopts an integral cast-in-place slab, on the one hand, the construction of the cast-in-place slab requires the erection of a support. Due to the steep terrain at the abutment, it is difficult to erect the cast-in-place support at the steep slope and there are certain safety risks, and at the same time the construction period is relatively long; on the other hand, the ratio of the longitudinal and transverse dimensions of the integral cast-in-place cover plate of the abutment is usually small, and its stress type is a typical two-way slab stress. When calculating, it cannot be simply calculated according to the beam element, but needs to be calculated according to the two-way slab, and main stress bars need to be arranged both longitudinally and transversely along the bridge direction.

[0005] In view of this, it is necessary to propose a precast segmented frame type abutment for mountainous steep slopes to solve or at least alleviate the above defects. Content of the Utility Model

[0006] The main purpose of the utility model is to provide a precast segmented frame type abutment for mountainous steep slopes to solve the problems of difficult erection of the abutment support and complex construction in the prior art.

[0007] To achieve the above purpose, the utility model provides a precast segmented frame type abutment for mountainous steep slopes, which includes a precast cover plate structure and a first support structure and a second support structure arranged at intervals along the longitudinal direction of the bridge. The bottoms of the first support structure and the second support structure are both used to be fixed in the mountain slope; wherein,

[0008] The precast cover plate structure includes a plurality of segmented precast cover plates arranged at intervals along the transverse direction of the bridge. The segmented precast cover plates extend along the longitudinal direction of the bridge, and both ends of the segmented precast cover plates are respectively fixed to the tops of the first support structure and the second support structure. A fracture gap is reserved at intervals between every two adjacent segmented precast cover plates.

[0009] Preferably, a plurality of grouting through holes arranged at intervals are formed at both ends of each segmented precast cover plate. The grouting through holes extend vertically. Reserved steel bars are arranged at the tops of the first support structure and the second support structure. The reserved steel bars correspondingly extend into the grouting through holes, and the grouting through holes are filled with grouting material.

[0010] Preferably, the ratio of the longitudinal length to the transverse width of the segmented precast cover plate is greater than 2.

[0011] Preferably, the first support structure includes a first capping beam and a plurality of first pile foundations arranged at intervals along the transverse direction of the bridge. The first capping beam is fixed to the tops of the first pile foundations. The second support structure includes a second capping beam and a plurality of second pile foundations arranged at intervals along the transverse direction of the bridge. The second capping beam is fixed to the tops of the second pile foundations. Both ends of the segmented precast cover plates are respectively fixed to the tops of the first capping beam and the second capping beam.

[0012] Preferably, the cross section of the first capping beam is arranged in a stepped shape, and one end of the segmented precast cover plate is fixed to the top of the high-position end of the first capping beam.

[0013] Preferably, the width of the segmented precast cover plate is 1 m to 2 m.

[0014] Preferably, it further includes a plurality of bearings arranged at intervals along the transverse direction of the bridge. The bearings are fixed to the low-position ends of the first capping beam.

[0015] Preferably, the fracture gap is filled with asphalt paste.

[0016] Preferably, the middle of the segmented precast cover plate is recessed upward.

[0017] Preferably, the width of the fracture gap is 2 cm to 2.2 cm.

[0018] Compared with the prior art, the present utility model has the following beneficial effects:

[0019] A prefabricated segmented frame type abutment for mountainous steep slopes provided by the utility model includes a prefabricated cover plate structure, a first support structure and a second support structure which are arranged at intervals along the longitudinal direction of the bridge. The bottoms of the first support structure and the second support structure are both used for being fixed in the mountain slope. The prefabricated cover plate structure includes a plurality of segmented prefabricated cover plates which are arranged at intervals along the transverse direction of the bridge. The segmented prefabricated cover plates extend along the longitudinal direction of the bridge. The two ends of the segmented prefabricated cover plates are respectively fixed to the tops of the first support structure and the second support structure. A fracture joint is reserved at intervals between every two adjacent segmented prefabricated cover plates. In this way, the problem of complex and difficult construction, high risk and long construction period of the existing integral cast-in-place frame abutment is solved by adopting the structure of assembling and constructing the prefabricated cover plate structure; and each segmented prefabricated cover plate is arranged in a form extending along the longitudinal direction of the bridge to expand the aspect ratio of the longitudinal and transverse dimensions, so that the force of the two-way slab is simplified to the force of the one-way slab, the force mode of the cover plate is simplified, and only longitudinal stressed main bars need to be arranged, saving engineering materials and reducing the project cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to the structures shown in these drawings.

[0021] Figure 1 It is a front elevation view of the application scenario of the overall structure in an embodiment of the present utility model;

[0022] Figure 2 It is a plan view of the overall structure in an embodiment of the present utility model;

[0023] Figure 3 It is a side view of the overall structure in an embodiment of the present utility model.

[0024] The realization of the purpose, functional features and advantages of the present utility model will be further described in conjunction with the embodiments and with reference to the drawings.

[0025] EXPLANATION OF THE REFERENCE NUMERALS IN THE DRAWINGS:

[0026] 10. Prefabricated cover plate structure; 110. Segmented prefabricated cover plate; 120. Grouting through hole; 130. Fracture joint; 20. First support structure; 210. First capping beam; 211. Support; 220. First pile foundation; 30. Second support structure; 310. Second capping beam; 320. Second pile foundation. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] It should be understood that the specific embodiments described herein are merely used to explain the present invention and are not intended to limit the present invention.

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0029] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0030] In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] Please refer to the attached Figures 1 - 3 , a precast segmented frame type abutment for mountainous steep slopes provided by an embodiment of the present invention includes a precast cover plate structure 10 and a first support structure 20 and a second support structure 30 arranged at intervals along the longitudinal direction of the bridge. The bottoms of the first support structure 20 and the second support structure 30 are both used to be fixed in the mountain slope. First of all, it should be noted that the longitudinal direction of the bridge in this application refers to the extension direction of the bridge, and the transverse direction of the bridge refers to the width direction of the bridge; different from the existing abutment, since the abutment cover plate adopts an integral cast-in-place slab, the construction of the cast-in-place slab requires the erection of a support. Due to the steep terrain at the abutment, it is difficult to erect the cast-in-place support at the steep slope and there are certain safety risks, and at the same time, the construction period is relatively long. This application solves the above defects in the prior art by providing a precast segmented frame type abutment for mountainous steep slopes. Specifically as follows:

[0032] The precast cover plate structure 10 includes a plurality of segmented precast cover plates 110 arranged at intervals along the transverse direction of the bridge. The segmented precast cover plates 110 extend along the longitudinal direction of the bridge, and both ends of the segmented precast cover plates 110 are respectively fixed to the top of the first support structure 20 and the top of the second support structure 30. A gap 130 is reserved at intervals between every two adjacent segmented precast cover plates 110.

[0033] Specifically, the precast segmented frame type abutment for mountainous steep slopes in this application includes a precast cover plate structure 10, a first support structure 20 and a second support structure 30 arranged at intervals along the longitudinal direction of the bridge. The first support structure 20 and the second support structure 30 are used to support the precast cover plate structure 10, and the precast cover plate structure 10 adopts a precast structural form, and is then positioned at the top of the first support structure 20 and the second support structure 30 by hoisting to connect the two, so as to jointly assemble into a frame type abutment.

[0034] Among them, the precast cover plate structure 10 includes a plurality of segmented precast cover plates 110 arranged at intervals along the transverse direction of the bridge, so as to be different from the integral cast-in-place slab in the prior art and be transformed into multiple separate segmented plates for assembly. And each segmented precast cover plate 110 is extended along the longitudinal direction of the bridge to increase the aspect ratio of the longitudinal and transverse dimensions of each segmented precast cover plate 110. It is worth noting that the aspect ratio of the longitudinal and transverse dimensions of the integral cast-in-place slab in the prior art is usually less than 2, and its stress type is typical two-way slab stress. Therefore, it cannot be simply calculated according to the beam element during calculation. In a preferred embodiment of this application, the ratio of the longitudinal length to the transverse width of the segmented precast cover plate 110 is set to be greater than 2, so as to simplify the two-way slab stress into one-way slab stress, simplify the stress mode of the cover plate. And because the transverse width becomes smaller, only longitudinal stress main bars need to be arranged for each segmented precast cover plate 110, saving engineering materials and reducing the project cost; further, during construction, both ends of the segmented precast cover plate 110 are respectively fixed to the top of the first support structure 20 and the top of the second support structure 30 to connect the first support structure 20 and the second support structure 30, and a gap 130 is reserved between every two adjacent segmented precast cover plates 110 to play the role of preventing thermal expansion and contraction, and it can usually be set to be 2 cm to 2.2 cm wide. Preferably, 2 cm is adopted.

[0035] As a preferred embodiment of the present utility model, a plurality of grouting through holes arranged at intervals are provided at both ends of each segmented precast cover plate. The grouting through holes extend vertically. Reserved steel bars are provided at the top of the first support structure and the second support structure. The reserved steel bars correspondingly extend into the grouting through holes, and grouting material is filled in the grouting through holes.

[0036] It should be noted that the grouting through holes 120 are used for connecting the segmented precast cover plates 110 with the first support structure 20 and the second support structure 30. During the construction of the first support structure 20 and the second support structure 30, steel bars are reserved at the top (not shown in the figure). When hoisting the segmented precast cover plates 110, the top reserved steel bars of the first support structure 20 and the second support structure 30 are respectively centered and inserted into the grouting through holes 120 at both ends of the segmented precast cover plates 110 for positioning. After filling grouting material through the grouting through holes 120, the connection with the first support structure 20 and the second support structure 30 is completed; preferably, multiple grouting through holes 120 at one end of each segmented precast cover plate 110 are arranged in a matrix, and the distribution range is the range where the end is laid on the support structure to ensure connection stability.

[0037] As a preferred embodiment of the present invention, the first support structure 20 includes a first capping beam 210 and a plurality of first pile foundations 220 arranged at intervals along the transverse direction of the bridge, and the first capping beam 210 is fixed on the top of the first pile foundations 220; the second support structure 30 includes a second capping beam 310 and a plurality of second pile foundations 320 arranged at intervals along the transverse direction of the bridge, and the second capping beam 310 is fixed on the top of the second pile foundations 320; both ends of the segmented precast cover plates 110 are respectively fixed on the top of the first capping beam 210 and the top of the second capping beam 310.

[0038] It is worth noting that the first pile foundation 220 is a front pile foundation, that is, close to the bridge side, and the second pile foundation 320 is a rear pile foundation, that is, far from the bridge side. The first capping beam 210 and the second capping beam 310 serve as load-bearing support structures, and the upper part is for installing the precast cover plate structure 10, while ensuring that the load can be effectively transmitted to the lower first pile foundation 220 and second pile foundation 320. Therefore, the first capping beam 210 is fixed on the top of the first pile foundation 220, the second capping beam 310 is fixed on the top of the second pile foundation 320, and both ends of the segmented precast cover plates 110 are respectively fixed on the top of the first capping beam 210 and the top of the second capping beam 310.

[0039] As a preferred embodiment of the present invention, the cross-section of the first capping beam 210 is arranged in a stepped shape, and one end of the segmented precast cover plate 110 is fixed on the top of the high-position end of the first capping beam 210.

[0040] It should be noted that the stepped shape enables the first capping beam 210 to be used for placing the bridge at the recess, and its high-position end is flush with the height of the second capping beam 310 to ensure that the segmented precast cover plate 110 is kept horizontal when laid.

[0041] Further, the width of the segmented precast cover slab 110 is 1 m to 2 m.

[0042] It should be noted that the width of the segmented precast cover slab 110 can be set according to the distance between the first capping beam 210 and the second capping beam 310 to ensure that the ratio of the longitudinal length to the transverse width of the segmented precast cover slab 110 is greater than 2. In a preferred embodiment of the present application, the width of the segmented precast cover slab 110 is 1 m to 2 m.

[0043] Further, it also includes a plurality of bearings 211 arranged at intervals along the transverse direction of the bridge, and the bearings 211 are fixed on the lower end of the first capping beam 210.

[0044] It should be understood that the bearings 211 are used for supporting the bridge and are fixed on the lower end of the first capping beam 210 so that the bridge is placed at the sunken position of the first capping beam 210.

[0045] Further, the crack 130 is filled with asphalt paste.

[0046] It should be noted that the asphalt paste can be used for joint waterproofing and serves as a filling material for the crack 130.

[0047] Further, the middle part of the segmented precast cover slab 110 is recessed upward.

[0048] It should be noted that by recessing the middle part of the segmented precast cover slab 110 upward, a cross-sectional form with a small middle thickness and large end thicknesses can be formed, so as to meet the stable connection strength at both ends and reduce the self-weight in the middle.

[0049] For the convenience of those skilled in the art to understand, the construction process is briefly described as follows:

[0050] First, clear the site, construct the first pile foundation 220 and the second pile foundation 320 respectively, and at the same time precast the segmented precast cover slab 110 in the factory; then construct the first capping beam 210 and the second capping beam 310 respectively, and reserve steel bars at the tops of the first capping beam 210 and the second capping beam 310; hoist the segmented precast cover slab 110 to the tops of the first capping beam 210 and the second capping beam 310 in sequence, and align and extend the reserved steel bars at the tops of the first capping beam 210 and the second capping beam 310 into the grouting through holes 120 at both ends of the segmented precast cover slab 110 to position the segmented precast cover slab 110 and reserve the crack 130; after positioning, grout through the grouting through holes 120 to complete the connection between the segmented precast cover slab 110 and the first capping beam 210 and the second capping beam 310, and fill the reserved crack 130 with asphalt paste; finally, set the bearings 211 at the lower end of the first capping beam 210 and erect the upper structure of the bridge.

[0051] The above are only the preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of the present utility model by the same token.

Claims

1. A precast segmented frame type abutment for steep mountain slopes, characterized in that It includes a precast cover plate structure, as well as a first support structure and a second support structure that are arranged at intervals along the longitudinal direction of the bridge. The bottoms of the first support structure and the second support structure are both used to be fixed in the mountain slope; wherein, The precast cover plate structure includes a plurality of segmented precast cover plates that are arranged at intervals along the transverse direction of the bridge. The segmented precast cover plates extend along the longitudinal direction of the bridge. The two ends of the segmented precast cover plates are respectively fixed to the tops of the first support structure and the second support structure, and a fracture gap is reserved at intervals between every two adjacent segmented precast cover plates.

2. The precast segmented framed abutment for mountainous steep slopes according to claim 1, wherein A plurality of grouting through holes that are arranged at intervals are opened at both ends of each segmented precast cover plate. The grouting through holes extend vertically. Reserved steel bars are arranged at the tops of the first support structure and the second support structure. The reserved steel bars correspondingly extend into the grouting through holes, and the grouting through holes are filled with grouting material.

3. The precast segmented frame type abutment for mountainous steep slope sections according to claim 1, characterized in that, The ratio of the longitudinal length to the transverse width of the segmented precast cover plate is greater than 2.

4. The precast segmented framed abutment for mountainous steep slopes according to claim 1, characterized in that, The first support structure includes a first capping beam and a plurality of first pile foundations that are arranged at intervals along the transverse direction of the bridge. The first capping beam is fixed to the top of the first pile foundation; the second support structure includes a second capping beam and a plurality of second pile foundations that are arranged at intervals along the transverse direction of the bridge. The second capping beam is fixed to the top of the second pile foundation; the two ends of the segmented precast cover plates are respectively fixed to the tops of the first capping beam and the second capping beam.

5. The prefabricated segmented frame type abutment for mountainous steep slopes according to claim 4, characterized in that The cross section of the first capping beam is arranged in a stepped shape, and one end of the segmented precast cover plate is fixed to the top of the high-position end of the first capping beam.

6. The precast segmented frame type abutment for steep mountain slopes according to claim 3, wherein, The width of the segmented precast cover plate is 1m to 2m.

7. The precast segmented framed abutment for steep mountain slopes according to claim 5, characterized in that, It also includes a plurality of bearings that are arranged at intervals along the transverse direction of the bridge. The bearings are fixed on the low-position end of the first capping beam.

8. The precast segmented framed abutment for steep mountain slopes according to claim 1, characterized in that, The fracture gap is filled with asphalt paste.

9. The precast segmented frame type abutment for steep mountain slopes according to claim 1, characterized in that, The middle part of the segmented precast cover plate is recessed upward.

10. The precast segmented framed abutment for mountainous steep slopes according to claim 1, wherein The width of the fracture gap is 2cm to 2.2cm.

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