CN112176853A - Pile-supported damping reinforced earth abutment and construction method thereof - Google Patents
Pile-supported damping reinforced earth abutment and construction method thereof Download PDFInfo
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- CN112176853A CN112176853A CN202011216618.3A CN202011216618A CN112176853A CN 112176853 A CN112176853 A CN 112176853A CN 202011216618 A CN202011216618 A CN 202011216618A CN 112176853 A CN112176853 A CN 112176853A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/28—Prefabricated piles made of steel or other metals
- E02D5/285—Prefabricated piles made of steel or other metals tubular, e.g. prefabricated from sheet pile elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
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Abstract
The invention discloses a pile-supported shock-absorbing reinforced earth abutment, which comprises a road bridge connection supporting system and a reinforced earth abutment system, wherein the reinforced earth abutment system comprises a reinforced earth complex, a modular wall surface and a supporting structure, which are formed by inserting reinforcing materials into filling earth, and the road bridge connection supporting system is arranged at the top of the reinforced earth complex; the modular wall surface is positioned on the outer side of the reinforced soil composite body; the supporting structure is vertically arranged in the reinforced soil composite body, and the lower end of the supporting structure penetrates through the reinforced soil composite body and then is anchored in the foundation; the supporting structure comprises a supporting pile, a buffer layer coated around the pile and an energy-absorbing material layer arranged on the top of the pile; the energy-absorbing material layer is in contact with the bottom of the road and bridge connecting and supporting system. The invention has the beneficial effects that: set up the energy-absorbing material layer at the top of supporting pile, can effectively cushion vertical impact force, prevent that the pile top from receiving destruction, set up the buffer layer around the stake, can prevent to concentrate the load and directly apply on one's body the stake, avoid taking place to cut and destroy, further increased the stability of abutment.
Description
Technical Field
The invention belongs to the technical field of highway bridge construction, and particularly relates to a pile-supported shock-absorption reinforced earth abutment and a construction method thereof.
Background
In recent years, with the requirement of gradually perfecting the traffic network in China, various new technologies begin to emerge, and the reinforced earth bridge abutment is one of a plurality of new technologies. The reinforced earth abutment is limited by its relatively limited bearing capacity, and it is difficult to construct a large bridge, and providing its bearing capacity often means a great increase in structural complexity and cost. For example, chinese patent document CN202881845U discloses a flexible reinforced earth abutment for a highway bridge, which is very disadvantageous to cost control of the reinforced earth abutment because the distance between the abutment and the wall surface is set too large to ensure the stability of the reinforced earth abutment. Chinese patent document CN204676593U discloses an ultrahigh integral steel-plastic grid reinforced earth abutment retaining wall structure, which is very complex in structure and obviously increases the difficulty of construction. As the upper load increases, its internal stability can also be greatly challenged. Pile-supported reinforced earth abutment structure that combines together pile-supported abutment and reinforced earth technique and propose can provide great bearing capacity, and because the great damping of reinforced earth, can dissipate considerable energy in the earthquake, protection architecture is not destroyed. However, the underpinning pile is susceptible to concentrated loads in normal operation and earthquakes, local damage occurs at the pile end, shear damage occurs at the pile shaft, and durability and safety of the structure are challenged.
Disclosure of Invention
The invention aims to provide a pile-supported shock-absorbing reinforced earth bridge abutment which is simple in structure, good in shock-absorbing performance, excellent in bearing capacity, and outstanding in durability and safety and a construction method thereof, aiming at the defects of the prior art.
The technical scheme adopted by the invention is as follows: a pile-supported shock-absorbing reinforced earth abutment comprises a reinforced earth abutment system and a road and bridge connection supporting system, wherein the reinforced earth abutment system comprises a reinforced earth complex, a modular wall surface and a supporting structure, the reinforced earth complex is formed by inserting reinforcing materials into filling earth, and the road and bridge connection supporting system is arranged at the top of the reinforced earth complex; the modular wall surface is positioned on the outer side of the reinforced soil composite body; the supporting structure is vertically arranged in the reinforced soil composite body, and the lower end of the supporting structure penetrates through the reinforced soil composite body and then is anchored in the foundation; the supporting structure comprises a supporting pile, a buffer layer coated on the peripheral surface of the supporting pile and an energy-absorbing material layer arranged at the top of the supporting pile; the energy-absorbing material layer is in contact with the bottom of the road bridge connecting and supporting system.
According to the scheme, the supporting pile is a steel pipe pile, and the length of the supporting pile in the foundation is not less than 1/3 of the total length of the supporting pile.
According to the scheme, the buffer layer comprises an EPS buffer material and geotextile coated outside the EPS buffer material.
According to the scheme, the modular wall comprises a foundation module and a plurality of wall units which are sequentially and vertically connected, wherein the foundation module is of an inverted T-shaped structure, and the wall units are arranged on the foundation module; a triangular stone protective body is arranged on the outer side of the bottom of the foundation module; one end of the rib material is inserted into a joint between the upper wall surface unit and the lower wall surface unit; the other end of the bar material horizontally extends into the filling soil to form a reinforced soil complex with the filling soil.
According to the scheme, the vertical interval of the reinforced materials in the reinforced soil composite body is 0.4-0.6 m.
According to the scheme, the road and bridge connecting and supporting system comprises a road surface structure, a bridge superstructure, an L-shaped pedestal and a reinforced earth approach with close spacing; the pavement structure is positioned at the upper part of the bridge superstructure, and one end of the bridge superstructure is lapped on the horizontal section of the L-shaped pedestal; the reinforced soil approach with the close interval is arranged outside the vertical section of the L-shaped pedestal; the top of the reinforced soil body is all located with inseparable interval reinforced soil approach to L type pedestal, and the bottom and the energy-absorbing material layer contact of L type pedestal.
According to the scheme, an EPS filling body is arranged between the end part of the horizontal section of the L-shaped pedestal and the modular wall surface.
According to the scheme, the reinforced soil guide way with the close spacing is of a back-covered reinforced soil structure, and the compaction degree of the filled soil inside the reinforced soil guide way is 90% -95%.
The invention also provides a construction method of the pile-supported shock-absorption reinforced earth abutment, which comprises the following steps:
leveling a field, entering materials and equipment required by construction, and preparing before construction;
step two, construction of a supporting structure: according to the design requirement, leveling the supporting pile which is covered with the buffer layer around the pile and is fixed with the energy absorption material layer on the pile top, and ensuring the foundation to be vertical;
step three, modular wall construction: placing a foundation module of the modular wall at a design position, filling a first layer of filler, compacting the filler, paving ribs after the top of the foundation is enlarged and leveled, arranging holes on the ribs at the position where the supporting structure passes through, and then circularly performing the steps of placing wall units, filling the filler, compacting and paving the ribs until the modular wall reaches the design height; leveling the surface of the filler to enable the modular wall to be flush with the top of the energy absorbing material layer of the pile top;
step four, constructing a road bridge connection supporting system: placing an L-shaped pedestal on the supporting structure, and performing back-wrapping type reinforced soil layer construction behind the L-shaped pedestal to ensure that the height of the compacted L-shaped pedestal is consistent with the top of the L-shaped reinforced concrete pedestal; and (4) placing the bridge superstructure on the other side of the L-shaped pedestal, and paving a pavement structure after the bridge superstructure is deformed and stabilized to finish construction.
The invention has the beneficial effects that:
1. according to the invention, the energy-absorbing material layer is arranged at the top of the supporting pile, so that the vertical impact force can be effectively buffered in the service process and earthquake, and the pile top of the supporting pile is prevented from being damaged; the use of the buffer layer around the pile can effectively reduce the soil pressure applied to the pile body by the soil body around the supporting pile, avoid the shearing damage of the concentrated load applied to the pile body, ensure that the structure has longer service life and obviously improve the durability and the safety of the structure.
2. The invention designs the supporting piles to directly support the bridge superstructure, the L-shaped pedestal and the reinforced earth approach with close spacing, which is beneficial to controlling the deformation of the modular wall surface and improving the stability; in earthquake, different response characteristics of the reinforced soil and the supporting pile can be utilized, so that the supporting pile is prevented from generating larger displacement, and the amplification effect of the top pile end is reduced.
3. According to the invention, the reinforced earth approach with close intervals is introduced into the road and bridge connection supporting system, so that the settlement deformation of the approach in the service process can be reduced, the differential settlement between the approach and the bridge is reduced, and the problem of 'bumping at the bridge head' is effectively solved.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a structural view of the support structure in this embodiment.
Wherein: 1. the concrete comprises supporting piles, 2 buffer layers, 2-1 geotextile, 2-2 EPS buffer materials, 3 energy absorbing material layers, 4 modular wall surfaces, 5 reinforcing materials, 6 filling, 7 pavement structures, 8 bridge superstructure, 9L-shaped pedestals, 10 tight-spacing reinforced soil approach channels, 11 EPS filling bodies and 12 grout stone protection bodies.
Detailed Description
For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
A pile-supported shock-absorbing reinforced earth abutment comprises a road bridge connection supporting system and a reinforced earth abutment system, wherein the reinforced earth abutment system comprises a reinforced earth complex formed by inserting reinforcing materials 5 into filling soil 6, a modular wall surface 4 and a supporting structure, and the road bridge connection supporting system is arranged at the top of the reinforced earth complex; the modular wall surface 4 is positioned on the outer side of the reinforced soil composite body, and the bottom of the modular wall surface is provided with a stone protecting body 12; the supporting structure is vertically arranged in the reinforced soil composite body, and the lower end of the supporting structure penetrates through the reinforced soil composite body and then is anchored in the foundation; the supporting structure comprises a supporting pile 1, a buffer layer 2 coated on the peripheral surface of the supporting pile 1 and an energy-absorbing material layer 3 arranged at the top of the supporting pile 1; the energy-absorbing material layer 3 is in contact with the bottom of the road and bridge connecting and supporting system.
Preferably, the underpinning pile 1 is a steel pipe pile, which is located in the ground for a length not less than 1/3 of the total length of the underpinning pile 1.
Preferably, the buffer layer 2 comprises an EPS buffer material 2-2 and geotextile 2-1 coated outside the EPS buffer material 2-2, and the buffer layer 2 is attached to the outer surface of the support pile 1 by adopting an adhesive.
In the invention, the buffer layer 2 is not in direct contact with the rib 5 in the reinforced soil composite body, and the rib 5 is provided with a hole in advance for the supporting pile 1 and the buffer layer 2 to pass through.
Preferably, the modular wall surface 4 comprises a base module and a plurality of wall surface units which are sequentially and vertically connected, the base module is of an inverted T-shaped structure, and the wall surface units are arranged on the base module; the outer side of the bottom of the basic module is provided with a triangular stone protective body 12; one end of the rib material 5 is inserted into a joint between the upper wall surface unit and the lower wall surface unit; the other end of the rib material 5 horizontally extends into the filling soil 6 to form a reinforced soil complex with the filling soil 6. The vertical interval of the rib materials 5 in the reinforced soil composite body is 0.4-0.6 m, and the rib materials 5 are in friction connection with the modular wall surface 4.
Preferably, the road and bridge connection supporting system comprises a road surface structure 7, a bridge superstructure 8, an L-shaped pedestal 9 and a close-spaced reinforced earth approach 10; the pavement structure 7 is positioned at the upper part of the bridge superstructure 8, and one end of the bridge superstructure 8 is lapped on the horizontal section of the L-shaped pedestal 9; the reinforced soil approach 10 with the close interval is arranged outside the vertical section of the L-shaped pedestal 9; the L-shaped pedestal 9 and the reinforced soil approach 10 with the close distance are both arranged at the top of the reinforced soil body, and the bottom of the L-shaped pedestal 9 is in contact with the energy-absorbing material layer 3; an EPS filling body 11 is arranged between the end part of the horizontal section of the L-shaped pedestal 9 and the modular wall surface 4. The reinforced soil approach 10 with the close spacing is of a back-covered reinforced soil structure and comprises a plurality of layers of filler bags stacked up and down in sequence, the filler bags adopt geogrids to back-cover fillers, and the compaction degree of the internal fillers is 90% -95%.
Examples
As shown in fig. 1, the pile-supported shock-absorbing reinforced earth abutment comprises a supporting pile 1, a buffer layer 2 arranged on the outer peripheral surface of the supporting pile 1, an energy-absorbing material layer 3 arranged on the top of the supporting pile 1, a modular wall surface 4, a rib material 5, filling soil 6, a road surface structure 7, a bridge superstructure 8, an L-shaped pedestal 9 (an L-shaped reinforced concrete pedestal) and a reinforced earth approach 10 with a close interval.
The supporting pile 1 directly supports the L-shaped pedestal 9 through the energy absorption material layer 3 on the pile top, so that the reinforced earth bridge abutment system does not bear the load of the bridge superstructure 8, the L-shaped pedestal 9 and the reinforced earth approach 10 at a close interval any more, and the deformation of a wall body of the reinforced earth bridge abutment system is favorably controlled and the stability is favorably maintained; the lower end of the underpinning pile 1 is anchored in the foundation through the reinforcement 5 and the fill 6. The support pile 1 is a steel pipe pile, and the length of the support pile 1 in the foundation is not less than 1/3 of the total length of the support pile 1, so that the whole structure is kept stable in service, and the support pile 1 provides sufficient bearing capacity.
The buffer layer 2 around the pile is attached to the outer surface of the supporting pile 1 through an adhesive, so that the soil pressure exerted on the supporting pile 1 by the surrounding soil body can be reduced, and the supporting pile is not easy to damage. As shown in fig. 2, the buffer layer 2 comprises EPS buffer material 2-2 and geotextile 2-1, and the geotextile 2-1 can prevent the buffer layer 2 from being punctured by gravels in the soil body. Buffer layer 2 does not contact with muscle material 5 direct contact of reinforced earth complex body, and muscle material 5 sets up the hole in advance and supplies support pile 1 and buffer layer 2 to pass, can prevent buffer layer 2 and muscle material 5 friction and damage.
The introduction of the pile top energy absorption material layer 3 can effectively prevent the pile top from being damaged by impact.
The vertical interval of the bars 5 in the reinforced soil composite body is 0.4-0.6 m, the connection mode of the bars 5 and the modular wall surface 4 is friction connection, the construction period of the structure is short, the cost is low, and the construction period and the compression cost are favorably shortened.
The L-shaped reinforced concrete pedestal bears the upper structure 8 of the bridge. The close-spaced reinforced soil approach 10 is of a back-covered reinforced soil structure, the compaction degree of the internal filling 6 is 90% -95%, the spacing between the internal reinforcing materials is 0.2-0.3 m, and the rigidity of the approach can be improved by adopting the spacing between the reinforcing materials with the compaction degree, so that the settlement deformation of the approach after service is effectively reduced, and the problem of 'bumping at bridge head' is solved.
A construction method of the pile-supported shock absorption reinforced earth abutment comprises the following steps:
leveling a field, entering materials and equipment required by construction, and preparing before construction;
step two, construction of a supporting structure: according to the design requirement, a supporting pile 1 which is covered with a buffer layer 2 on the periphery of the pile and is fixed with an energy absorption material layer 3 on the top of the pile is leveled to form a foundation and is ensured to be vertical;
step three, modular wall construction: placing a base module of a modular wall surface 4 at a design position, filling a first layer of filler, compacting the filler by using a small-sized hand-held rolling machine, paving a rib material 5 after the top of the base is enlarged and leveled, arranging a hole on the rib material 5 at a position where a supporting structure passes through, and then circularly performing the steps of placing a wall surface unit, filling the filler, compacting and paving the rib material 5 until the modular wall body reaches the design height; leveling the surface of the filler to enable the modular wall to be flush with the top of the energy absorbing material layer 3 on the pile top;
step four, constructing a road bridge connection supporting system: placing the L-shaped pedestal 9 on a supporting structure, and then performing back-wrapping type reinforced soil layer construction behind the L-shaped pedestal 9 to ensure that the height of the compacted L-shaped pedestal is consistent with the top of the L-shaped reinforced concrete pedestal; and (3) placing the bridge superstructure 8 on the other side of the L-shaped pedestal 9, and paving the pavement structure 7 after the deformation is stable to complete construction.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the embodiments, it will be apparent to those skilled in the art that modifications can be made to the technical solutions described in the above-mentioned embodiments, or equivalent substitutions of some technical features, but any modifications, equivalents, improvements and the like within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims (9)
1. A pile-supported shock-absorbing reinforced earth abutment is characterized by comprising a reinforced earth abutment system and a road and bridge connection supporting system, wherein the reinforced earth abutment system comprises a reinforced earth complex, a modular wall surface and a supporting structure which are formed by inserting reinforcing materials into filling earth, and the road and bridge connection supporting system is arranged at the top of the reinforced earth complex; the modular wall surface is positioned on the outer side of the reinforced soil composite body; the supporting structure is vertically arranged in the reinforced soil composite body, and the lower end of the supporting structure penetrates through the reinforced soil composite body and then is anchored in the foundation; the supporting structure comprises a supporting pile, a buffer layer coated on the peripheral surface of the supporting pile and an energy-absorbing material layer arranged at the top of the supporting pile; the energy-absorbing material layer is in contact with the bottom of the road bridge connecting and supporting system.
2. The pile-supported shock-absorbing reinforced earth abutment as claimed in claim 1, wherein the supporting piles are steel pipe piles located in the ground for a length of not less than 1/3 of the total length of the supporting piles.
3. The pile-supported shock-absorbing reinforced earth abutment of claim 1, wherein the buffer layer comprises an EPS buffer material and geotextile coated outside the EPS buffer material.
4. The pile-supported shock-absorbing reinforced earth abutment of claim 1, wherein the modular wall comprises a foundation module and a plurality of wall units which are sequentially and vertically connected, the foundation module is of an inverted T-shaped structure, and the wall units are arranged on the foundation module; a triangular stone protective body is arranged on the outer side of the bottom of the foundation module; one end of each rib is inserted into a joint between the upper wall unit and the lower wall unit, and the other end of each rib horizontally extends into the filling soil to form a reinforced soil complex with the filling soil.
5. The pile-supported shock-absorbing reinforced earth abutment as claimed in claim 1, wherein the vertical interval of the reinforcing bars in the reinforced earth composite body is 0.4-0.6 m.
6. The pile-supported shock-absorbing reinforced earth abutment of claim 1, wherein the road-bridge connection support system comprises a road surface structure, a bridge superstructure, an L-shaped pedestal and a close-spaced reinforced earth approach; the pavement structure is positioned at the upper part of the bridge superstructure, and one end of the bridge superstructure is lapped on the horizontal section of the L-shaped pedestal; the reinforced soil approach with the close interval is arranged outside the vertical section of the L-shaped pedestal; the top of the reinforced soil body is all located with inseparable interval reinforced soil approach to L type pedestal, and the bottom and the energy-absorbing material layer contact of L type pedestal.
7. The pile-supported shock-absorbing reinforced earth abutment as claimed in claim 6, wherein an EPS filler is provided between the end of the horizontal section of the L-shaped pedestal and the modular wall surface.
8. The pile-supported shock-absorbing reinforced earth abutment as claimed in claim 6, wherein the close-spaced reinforced earth approach is a turn-up reinforced earth structure, and the degree of compaction of the filled earth inside is 90% to 95%.
9. A construction method of the pile-supported shock-absorbing reinforced earth abutment as claimed in any one of claims 1 to 8, comprising the steps of:
leveling a field, entering materials and equipment required by construction, and preparing before construction;
step two, construction of a supporting structure: according to the design requirement, leveling the supporting pile which is covered with the buffer layer around the pile and is fixed with the energy absorption material layer on the pile top, and ensuring the foundation to be vertical;
step three, modular wall construction: placing a foundation module of the modular wall at a design position, filling a first layer of filler, compacting the filler, paving a rib material after the top of the foundation is enlarged and leveled, arranging holes on the rib material at the position where the supporting structure passes through, and then circularly performing the steps of placing a wall unit, filling the filler, compacting and paving the rib material until the modular wall reaches the design height; leveling the surface of the filler to enable the modular wall surface to be flush with the top of the energy absorbing material layer of the pile top;
step four, constructing a road bridge connection supporting system: placing an L-shaped pedestal on the supporting structure, and performing back-wrapping type reinforced soil layer construction behind the L-shaped pedestal to ensure that the height of the compacted L-shaped pedestal is consistent with the top of the L-shaped reinforced concrete pedestal; and (4) placing the bridge superstructure on the other side of the L-shaped pedestal, and paving a pavement structure after the bridge superstructure is deformed and stabilized to finish construction.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113073537A (en) * | 2021-04-25 | 2021-07-06 | 王拴保 | Bridge approach structure of highway engineering and construction method thereof |
| CN115233745A (en) * | 2022-07-26 | 2022-10-25 | 中交三航局第三工程有限公司 | Geotextile wrapping method for preventing penetration around pile body of pipe pile of revetment structure |
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| 叶建东等: "利用土工格栅减小桥台桩土压力和桩体位移的研究 ", 《河海大学学报(自然科学版)》 * |
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| CN113073537A (en) * | 2021-04-25 | 2021-07-06 | 王拴保 | Bridge approach structure of highway engineering and construction method thereof |
| CN113073537B (en) * | 2021-04-25 | 2022-03-01 | 王拴保 | Bridge approach structure of highway engineering and construction method thereof |
| CN115233745A (en) * | 2022-07-26 | 2022-10-25 | 中交三航局第三工程有限公司 | Geotextile wrapping method for preventing penetration around pile body of pipe pile of revetment structure |
| CN115233745B (en) * | 2022-07-26 | 2023-06-30 | 中交三航局第三工程有限公司 | Geotextile wrapping method for preventing permeation around pile body of pile in revetment structure |
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