CN113235400A - Adjustable slot-in type prefabricated pier stud and bearing platform connecting structure and construction method - Google Patents
Adjustable slot-in type prefabricated pier stud and bearing platform connecting structure and construction method Download PDFInfo
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- CN113235400A CN113235400A CN202110647119.8A CN202110647119A CN113235400A CN 113235400 A CN113235400 A CN 113235400A CN 202110647119 A CN202110647119 A CN 202110647119A CN 113235400 A CN113235400 A CN 113235400A
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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
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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
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
- E02D27/14—Pile framings, i.e. piles assembled to form the substructure
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Abstract
A connection structure of an adjustable slot-in type prefabricated pier stud and a bearing platform and a construction method belong to the technical field of bridge engineering. The purpose is in prefabricated pier stud and the aspect of cushion cap connection, solves a great deal of inconvenience that urban bridge tradition construction technology brought. The technical points are as follows: the invention is an improvement and innovation on the basis of the traditional wet joint connection and slot-in type connection, and integrates a prefabricated pier adjusting and supporting system. The post-pouring groove is reserved at the top of the bearing platform, connecting steel bars stretch out of the bottom of the prefabricated pier and a prefabricated pier head is arranged, foundation bolts are embedded in the bearing platform and connected with the prefabricated pier head, the post-pouring section of the bearing platform is poured to achieve connection of the prefabricated pier and the bearing platform, and the perpendicularity of the pier is adjusted by adopting a foundation bolt adjusting system. Compared with the traditional bridge construction process, the method has the advantages of high installation precision, simple and convenient verticality adjustment, short time of hoisting equipment, reliable connection, no need of independent vertical molds or supports on the ground of a construction site, small floor area and the like.
Description
Technical Field
The invention relates to a prefabricated pier stud and bearing platform connecting structure and a construction method, in particular to an adjustable slot type prefabricated pier stud and bearing platform connecting structure and a construction method, and belongs to the technical field of bridge engineering.
Background
At present, urban bridge construction conditions in China still mainly adopt cast-in-place and manually bound substructure, and disadvantages existing in the construction are gradually revealed, such as long construction time and overlarge labor force demand, which not only affect road traffic, but also affect society to a certain extent, such as noise, dust, light and the like, which all interfere with the environment to a large extent, so that the urban bridge construction conditions cannot meet the civilized construction standards. In addition, extensive construction causes the whole industry to have higher energy consumption, applies greater pressure to cities, and properly solves the problems. Along with the development of cities, the assembly construction of urban bridges is imperative.
At present, the connection treatment of the prefabricated bridge pier and the bearing platform mainly comprises the following ideas: (1) and connecting the grouting sleeve. The bearing platform extends out of the steel bar, the sleeve is pre-embedded at the bottom of the prefabricated bridge pier, the high-strength non-shrinkage cement grouting material is filled in a gap between the steel bar and the connecting sleeve, a joint is formed after hardening, and a mortar cushion layer or an epoxy connecting agent is adopted on the contact surface of the bridge pier and the bearing platform. (2) And (4) connecting in a prestressed mode. The prestressed tendons are embedded in the bearing platform, the bridge pier penetrates through the prestressed tendons extending out of the bearing platform during hoisting, and the prestressed force is tensioned at the bridge pier section or the bridge pier top (cover beam top), so that the connection between the prefabricated bridge pier and the bearing platform is realized. The joint surface of the pier and the bearing platform adopts a joint epoxy glue or mortar cushion layer. (3) And (4) socket connection. The socket joint type connection is characterized in that a pier body is inserted into a reserved hole of a bearing platform, the length of the pier body is usually 1.2-1.5 times of the pier body cross section, mortar is laid at the bottom of the pier body, and concrete (semi-dry hard) is used for filling the periphery of the pier body. (4) Wet seam joining. The wet joint connection mainly embodies that connecting steel bars are reserved for the bearing platform and the pier during prefabrication, temporary supports and templates are arranged among the components, the components extend out of the steel bars to be mutually lapped, and the connection is formed through pouring post-pouring sections.
The four connection processing methods of the prefabricated bridge pier and the bearing platform respectively have the following problems:
(1) the method is suitable for large-scale piers of the same type, such as urban viaducts and the like, and the structure of the method is mainly characterized in that the method has higher requirements on construction precision, the field construction period is short, the workload is smaller, but the anti-seismic capacity of the method still needs to be further researched, the fault-tolerant rate of a construction field is small, and the construction precision is higher.
(2) The prestressed reinforcing steel is generally finish-rolled deformed steel bar. The connection is widely applied to actual engineering, and the construction technology, design and computational analysis are mature. But the pier body has high cost, complex process and long period.
(3) The socket joint type connection has the advantages of simple process and less workload, and has the defects of insufficient mechanical behavior, incapability of continuously bearing the top layer stressed steel bars of the bearing platform and still needing to research the shock resistance.
(4) The structure is mainly suitable for large-tonnage piers such as a cross-sea bridge and the like, the mechanical property of the structure is similar to that of a traditional cast-in-place concrete mode, the principle is simple, and the wet joint structure is also a design idea which is frequently used in China at present. However, the wet joint needs to be provided with a bracket and a template, the construction period is prolonged, the workload is increased, and the structure has defects in view of the construction speed.
Disclosure of Invention
In view of the above facts, the present invention aims to solve the inconvenience caused by the traditional construction process of urban bridges and to realize the full prefabrication construction of urban bridges, and provides a connection structure and a construction method of an adjustable slot-in type prefabricated pier stud and a bearing platform on the basis of the existing connection mode of prefabricated piers and bearing platforms. The safety performance is high, connect reliably, hardly has extra occupation of land, and simple process has solved the difficult problem of being connected of prefabricated pier stud and cushion cap.
In order to achieve the purpose, the invention adopts the following technical scheme:
the first scheme is as follows: a connecting structure of an adjustable slot type prefabricated pier column and a bearing platform comprises the bearing platform, a foundation bolt adjusting system, a bearing platform top layer main rib, a bearing platform stirrup, a prefabricated pier head, a prefabricated pier main rib and a pier stirrup;
the bearing platform is a cast-in-place bearing platform, an anchor bolt adjusting system, a main reinforcement on the top layer of the bearing platform and a stirrup of the bearing platform are pre-embedded in the bearing platform, a post-casting groove of the bearing platform is arranged at the position of the bearing platform corresponding to the prefabricated bridge pier, the anchor bolt adjusting system is positioned on the periphery of the post-casting groove of the bearing platform, the upper end of the anchor bolt adjusting system extends out of the bearing platform, and the main reinforcement on the top layer of the bearing platform and the stirrup of the bearing platform are positioned on the top layer of the bearing platform;
the prefabricated bridge pier is a factory prefabricated component, a prefabricated bridge pier main rib is embedded in the prefabricated bridge pier main rib, the prefabricated bridge pier main rib extends out of the prefabricated bridge pier, and a bridge pier stirrup is fixed on the prefabricated bridge pier main rib; the pier stirrups and the extending ends of the prefabricated pier main reinforcements are placed in the post-cast groove of the bearing platform;
the prefabricated pier heads are symmetrically clamped at the bottom of the prefabricated pier, the upper end of the foundation bolt adjusting system is connected with the prefabricated pier heads, and the foundation bolt adjusting system is used for adjusting the verticality of the prefabricated pier; a plurality of exhaust holes are formed in the prefabricated pier heads and located above the cushion cap post-pouring groove, a pouring notch is formed between the two symmetrically-arranged prefabricated pier heads and communicated with the cushion cap post-pouring groove, and fine aggregate concrete or UHPC is poured in the cushion cap post-pouring groove.
Further: the foundation bolt adjusting system comprises a foundation bolt, a fastening nut and an adjusting cushion block, the foundation bolt is embedded in the bearing platform, and the upper end of the foundation bolt is connected with the prefabricated pier head through the fastening nut and the adjusting cushion block. The foundation bolt adjusting system has the functions of positioning, adjusting verticality and connecting.
Further: the outward extension length of the main reinforcement of the prefabricated bridge pier is equal to the depth of a post-cast groove of the bearing platform, and the requirement of anchoring length is met.
Further: and the top layer main reinforcement of the bearing platform and the stirrup of the bearing platform are connected in the range of the post-cast groove of the bearing platform, and the plane positions of the top layer main reinforcement of the bearing platform and the stirrup of the bearing platform keep away from the positions of the main reinforcement of the precast pier and the foundation bolt adjusting system.
Further: the depth of the post-cast groove of the bearing platform is 120-150 cm, the size of the top surface is 10-15 cm larger than the size of the single side of the section of the prefabricated pier, the size of the bottom surface corresponds to the size of the section of the pier, and a chamfer of 10 multiplied by 10cm is arranged on the bottom surface.
Further: the prefabricated pier heads are rectangular pieces and are symmetrically arranged along the transverse bridge direction of the prefabricated pier.
Further: the sectional dimension of the prefabricated pier head is larger than that of the prefabricated pier, and the height of the prefabricated pier head is 30-50 cm. The stability requirement is met.
Further: the top surface of the bearing platform is flat.
Further: the number of the exhaust holes is 4.
In summary, the invention improves and integrates the prefabricated pier adjusting and supporting system on the basis of the traditional wet joint connection and slot-in type connection, a post-pouring groove is reserved at the top of a bearing platform, connecting steel bars extend out of the bottom of the prefabricated pier and a prefabricated pier head is arranged, a foundation bolt embedded in the bearing platform is connected with the prefabricated pier head, the connection between the prefabricated pier and the bearing platform is realized through the post-pouring section of the poured bearing platform, and the perpendicularity of a pier column is adjusted by adopting the foundation bolt adjusting system.
Scheme II: a construction method for a connection structure of an adjustable slot-in type prefabricated pier stud and a bearing platform comprises the following specific steps:
step one, constructing a bridge pile foundation and a cushion layer of a bearing platform;
step two, casting a bearing platform in situ, reserving a post-casting groove of the bearing platform, and embedding a foundation bolt adjusting system, a top-layer main rib of the bearing platform and a hoop of the bearing platform;
hoisting the prefabricated bridge pier, mounting the prefabricated pier head, temporarily fixing the prefabricated bridge pier through a foundation bolt adjusting system, and measuring the verticality of the prefabricated bridge pier;
adjusting the verticality of the prefabricated bridge pier to meet the requirement by adopting a foundation bolt adjusting system, and fixing in place;
pouring a groove and maintaining after the bearing platform 2 is poured by using fine aggregate concrete or UHPC through the pouring notch, and discharging gas from an exhaust hole in the pouring process;
and step six, completing the connection of the prefabricated bridge pier and the bearing platform.
Further: the top surface of the bearing platform in the second step is processed to be smooth, and foundation bolts of the foundation bolt adjusting system are embedded in the bearing platform; and in the third step, the upper end of the foundation bolt is connected with the prefabricated pier head through a fastening nut and an adjusting cushion block. The foundation bolt adjusting system has the functions of positioning, adjusting verticality and connecting.
Further: and the outward extension length of the main prefabricated pier ribs of the prefabricated pier in the third step is equal to the depth of the post-cast groove of the bearing platform in the second step, and the requirement of anchoring length is met.
Further: and connecting the main reinforcement at the top layer of the bearing platform and the stirrup of the bearing platform in the range of the post-cast groove of the bearing platform in the step two, and keeping the plane positions of the main reinforcement at the top layer of the bearing platform and the stirrup of the bearing platform away from the positions of the main reinforcement of the prefabricated pier and the foundation bolt adjusting system of the prefabricated pier in the step three.
Further: in the second step, the depth of a post-pouring groove of the reserved bearing platform is 120-150 cm, the size of the top surface is 10-15 cm larger than the size of the single side of the section of the prefabricated pier, the size of the bottom surface corresponds to the size of the section of the pier, and a chamfer of 10 multiplied by 10cm is arranged on the bottom surface.
Further: in the third step, the prefabricated pier heads are rectangular pieces and symmetrically arranged along the transverse bridge direction of the prefabricated pier, the section size of the prefabricated pier heads is larger than that of the prefabricated pier, and the height of the prefabricated pier heads is 30-50 cm. The stability requirement is met.
The invention achieves the following effects:
the invention improves and integrates a prefabricated pier adjusting and supporting system on the basis of the traditional wet joint connection and slot type connection, realizes the connection between the prefabricated pier and a bearing platform by pouring a post-pouring section of the bearing platform, and adjusts the perpendicularity of the pier column by adopting a foundation bolt adjusting system. Compared with the traditional bridge construction process, the method has the advantages of simple principle, reliable connection, no need of independent formwork erection and support erection on the ground of a construction site, less occupied area, convenience in adjustment, short time for occupying hoisting equipment, high installation precision and the like.
Drawings
Fig. 1 is a schematic structural view of a connection structure of an adjustable slot-in type prefabricated pier stud and a bearing platform according to the present invention;
fig. 2 is a sectional view a-a of fig. 1.
Wherein:
1-bearing platform, 2-bearing platform post-pouring groove, 3-foundation bolt adjusting system, 4-bearing platform top layer main rib, 5-bearing platform stirrup, 6-prefabricated bridge pier, 7-prefabricated pier head, 8-prefabricated bridge pier main rib, 9-bridge pier stirrup, 10-vent hole and 11-pouring notch.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In this application, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.
Furthermore, the terms "disposed," "connected," and "secured" are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Preferred embodiments of the present invention are explained in detail below with reference to the accompanying drawings.
Example 1: referring to fig. 1 and 2, the connection structure of the adjustable slot-in type prefabricated pier stud and the bearing platform of the embodiment comprises a bearing platform 1, an anchor bolt adjusting system 3, a bearing platform top layer main rib 4, a bearing platform stirrup 5, a prefabricated pier 6, a prefabricated pier head 7, a prefabricated pier main rib 8 and a pier stirrup 9; the foundation bolt adjusting system 3 comprises a foundation bolt, a fastening nut and an adjusting cushion block;
the bearing platform 1 is a cast-in-place bearing platform, the top surface is flat, foundation bolts, a main reinforcement 4 at the top layer of the bearing platform and a stirrup 5 of the bearing platform are embedded in the bearing platform 1, a post-bearing platform casting groove 2 is arranged at the position, corresponding to the prefabricated pier 6, of the bearing platform 1, the depth of the post-bearing platform casting groove 2 is 120cm, the size of the top surface is 10cm larger than the single side of the section size of the prefabricated pier 6, the size of the bottom surface corresponds to the section size of the pier, and a chamfer angle of 10 multiplied by 10cm is arranged on the bottom surface;
the foundation bolts are positioned on the periphery of the bearing platform rear pouring groove 2, the upper ends of the foundation bolts extend out of the bearing platform 1, and the bearing platform top layer main ribs 4 and the bearing platform stirrups 5 are positioned on the top layer of the bearing platform 1;
the prefabricated bridge pier 6 is a factory prefabricated component, a prefabricated bridge pier main rib 8 is embedded, the length of the prefabricated bridge pier main rib 8 extending outwards out of the prefabricated bridge pier 6 is equal to the depth of the bearing platform post-pouring groove 2, the requirement of anchoring length is met, and a bridge pier stirrup 9 is fixed on the prefabricated bridge pier main rib 8; the extending ends of the pier stirrups 9 and the prefabricated pier main reinforcements 8 are placed in the bearing platform post-pouring groove 2; the top-layer main reinforcement 4 and the cushion cap stirrup 5 of the cushion cap are connected and pass through in the range of the cushion cap post-pouring groove 2, and the plane positions of the top-layer main reinforcement 4 and the cushion cap stirrup 5 of the cushion cap keep away from the positions of the main reinforcement 8 of the precast pier and the foundation bolt adjusting system 3;
the prefabricated pier heads 7 are rectangular pieces and are symmetrically clamped at the bottom of the prefabricated pier 6 along the transverse bridge direction of the prefabricated pier, the section size of the prefabricated pier heads 7 is larger than that of the prefabricated pier, the height of the prefabricated pier heads is 30cm, and the requirement on stability is met; the upper end of the foundation bolt is connected with the prefabricated pier head 7 through a fastening nut and an adjusting cushion block and is used for adjusting the verticality of the prefabricated pier 6; the foundation bolt adjusting system has the functions of positioning, adjusting verticality and connecting; the prefabricated pier heads 7 are provided with 4 exhaust holes 10, the exhaust holes 10 are located above the cushion cap post-pouring groove 2, a pouring notch 11 is formed between the two symmetrically-arranged prefabricated pier heads 7, the pouring notch 11 is communicated with the cushion cap post-pouring groove 2, and fine aggregate concrete is poured in the cushion cap post-pouring groove 2.
Example 2: referring to fig. 1 and 2, the connection structure of the adjustable slot-in type prefabricated pier stud and the bearing platform of the embodiment comprises a bearing platform 1, an anchor bolt adjusting system 3, a bearing platform top layer main rib 4, a bearing platform stirrup 5, a prefabricated pier 6, a prefabricated pier head 7, a prefabricated pier main rib 8 and a pier stirrup 9; the foundation bolt adjusting system 3 comprises a foundation bolt, a fastening nut and an adjusting cushion block;
the bearing platform 1 is a cast-in-place bearing platform, the top surface is flat, foundation bolts, a main reinforcement 4 at the top layer of the bearing platform and a stirrup 5 of the bearing platform are embedded in the bearing platform 1, a post-bearing platform casting groove 2 is arranged at the position of the bearing platform 1 corresponding to the prefabricated pier 6, the depth of the post-bearing platform casting groove 2 is 150cm, the size of the top surface is 15cm larger than the single side of the section size of the prefabricated pier 6, the size of the bottom surface corresponds to the section size of the pier, and a chamfer angle of 10 multiplied by 10cm is arranged on the bottom surface;
the foundation bolts are positioned on the periphery of the bearing platform rear pouring groove 2, the upper ends of the foundation bolts extend out of the bearing platform 1, and the bearing platform top layer main ribs 4 and the bearing platform stirrups 5 are positioned on the top layer of the bearing platform 1;
the prefabricated bridge pier 6 is a factory prefabricated component, a prefabricated bridge pier main rib 8 is embedded, the length of the prefabricated bridge pier main rib 8 extending outwards out of the prefabricated bridge pier 6 is equal to the depth of the bearing platform post-pouring groove 2, the requirement of anchoring length is met, and a bridge pier stirrup 9 is fixed on the prefabricated bridge pier main rib 8; the extending ends of the pier stirrups 9 and the prefabricated pier main reinforcements 8 are placed in the bearing platform post-pouring groove 2; the top-layer main reinforcement 4 and the cushion cap stirrup 5 of the cushion cap are connected and pass through in the range of the cushion cap post-pouring groove 2, and the plane positions of the top-layer main reinforcement 4 and the cushion cap stirrup 5 of the cushion cap keep away from the positions of the main reinforcement 8 of the precast pier and the foundation bolt adjusting system 3;
the prefabricated pier heads 7 are rectangular pieces and are symmetrically clamped at the bottom of the prefabricated pier 6 along the transverse bridge direction of the prefabricated pier, the section size of the prefabricated pier heads 7 is larger than that of the prefabricated pier, the height of the prefabricated pier heads is 50cm, and the requirement on stability is met; the upper end of the foundation bolt is connected with the prefabricated pier head 7 through a fastening nut and an adjusting cushion block and is used for adjusting the verticality of the prefabricated pier 6; the foundation bolt adjusting system has the functions of positioning, adjusting verticality and connecting; 4 exhaust holes 10 are formed in the prefabricated pier heads 7, the exhaust holes 10 are located above the cushion cap post-pouring groove 2, a pouring notch 11 is formed between the two prefabricated pier heads 7 which are symmetrically arranged, the pouring notch 11 is communicated with the cushion cap post-pouring groove 2, and UHPC is poured in the cushion cap post-pouring groove 2.
Example 3: referring to fig. 1 and 2, the construction method of the connection structure of the adjustable slot-in type prefabricated pier stud and the bearing platform of the embodiment includes the following specific steps:
step one, constructing a bridge pile foundation and a cushion layer of a bearing platform;
step two, casting a bearing platform 1 in situ, reserving a post-casting groove 2 of the bearing platform, and embedding a foundation bolt adjusting system 3, a top-layer main reinforcement 4 of the bearing platform and a hoop reinforcement 5 of the bearing platform; the depth of the reserved bearing platform post-pouring groove 2 is 120cm, the size of the top surface is 10cm larger than the size of the single side of the section of the prefabricated pier 6, the size of the bottom surface corresponds to the size of the section of the pier, and a chamfer angle of 10 multiplied by 10cm is arranged on the bottom surface;
wherein: the top surface of the bearing platform 1 is processed to be smooth, and foundation bolts of the foundation bolt adjusting system 3 are embedded in the bearing platform 1;
the top layer main reinforcement 4 of the bearing platform and the stirrup 5 of the bearing platform are connected and pass through in the range of the post-cast groove 2 of the bearing platform, and the plane positions of the top layer main reinforcement 4 of the bearing platform and the stirrup 5 of the bearing platform avoid the positions of the main reinforcement 8 of the prefabricated pier 6 and the foundation bolt adjusting system 3 in the third step;
thirdly, hoisting the prefabricated bridge pier 6, installing a prefabricated pier head 7, temporarily fixing the prefabricated bridge pier through the foundation bolt adjusting system 3, and measuring the verticality of the prefabricated bridge pier;
wherein: the prefabricated pier heads 7 are rectangular pieces and are symmetrically arranged along the transverse direction of the prefabricated pier, the section size of the prefabricated pier heads 7 is larger than that of the prefabricated pier, the height of the prefabricated pier heads is 30cm, and the requirement on stability is met;
the prefabricated pier head 7 is connected with the upper end of the foundation bolt through a fastening nut and an adjusting cushion block. The foundation bolt adjusting system has the functions of positioning, adjusting verticality and connecting;
the outward extension length of a main prefabricated pier rib 8 of the prefabricated pier 6 is equal to the depth of the post-cast groove 2 of the bearing platform, and the requirement of anchoring length is met;
step four, adjusting the verticality of the prefabricated bridge pier 6 by adopting the foundation bolt adjusting system 3 until the verticality meets the requirement, and fixing the prefabricated bridge pier in place;
pouring the groove and maintaining after pouring the bearing platform 2 by using fine stone concrete through the pouring notch 11, and exhausting gas from the exhaust holes 10 in the pouring process;
and step six, completing the connection of the prefabricated bridge pier and the bearing platform.
Example 4: referring to fig. 1 and 2, the construction method of the connection structure of the adjustable slot-in type prefabricated pier stud and the bearing platform of the embodiment includes the following specific steps:
step one, constructing a bridge pile foundation and a cushion layer of a bearing platform;
step two, casting a bearing platform 1 in situ, reserving a post-casting groove 2 of the bearing platform, and embedding a foundation bolt adjusting system 3, a top-layer main reinforcement 4 of the bearing platform and a hoop reinforcement 5 of the bearing platform; the depth of the reserved bearing platform post-pouring groove 2 is 150cm, the size of the top surface is 15cm larger than the size of the single side of the section of the prefabricated pier 6, the size of the bottom surface corresponds to the size of the section of the pier, and a chamfer angle of 10 multiplied by 10cm is arranged on the bottom surface;
wherein: the top surface of the bearing platform 1 is processed to be smooth, and foundation bolts of the foundation bolt adjusting system 3 are embedded in the bearing platform 1;
the top layer main reinforcement 4 of the bearing platform and the stirrup 5 of the bearing platform are connected and pass through in the range of the post-cast groove 2 of the bearing platform, and the plane positions of the top layer main reinforcement 4 of the bearing platform and the stirrup 5 of the bearing platform avoid the positions of the main reinforcement 8 of the prefabricated pier 6 and the foundation bolt adjusting system 3 in the third step;
thirdly, hoisting the prefabricated bridge pier 6, installing a prefabricated pier head 7, temporarily fixing the prefabricated bridge pier through the foundation bolt adjusting system 3, and measuring the verticality of the prefabricated bridge pier;
wherein: the prefabricated pier heads 7 are rectangular pieces and are symmetrically arranged along the transverse direction of the prefabricated pier, the section size of the prefabricated pier heads 7 is larger than that of the prefabricated pier, the height of the prefabricated pier heads is 50cm, and the requirement on stability is met;
the prefabricated pier head 7 is connected with the upper end of the foundation bolt through a fastening nut and an adjusting cushion block. The foundation bolt adjusting system has the functions of positioning, adjusting verticality and connecting;
the outward extension length of a main prefabricated pier rib 8 of the prefabricated pier 6 is equal to the depth of the post-cast groove 2 of the bearing platform, and the requirement of anchoring length is met;
step four, adjusting the verticality of the prefabricated bridge pier 6 by adopting the foundation bolt adjusting system 3 until the verticality meets the requirement, and fixing the prefabricated bridge pier in place;
pouring a post-pouring groove of the bearing platform 2 by using UHPC through the pouring notch 11 and maintaining, wherein gas is exhausted from the exhaust hole 10 in the pouring process;
and step six, completing the connection of the prefabricated bridge pier and the bearing platform.
The above examples have the following effects compared to the existing wet seam joining technique (see table 1):
table 1 is an effect comparison table
The above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. The utility model provides a connection structure of prefabricated pier stud of adjustable slot-in type and cushion cap which characterized in that: the device comprises a bearing platform (1), a bearing platform post-pouring groove (2), a foundation bolt adjusting system (3), a bearing platform top layer main rib (4), a bearing platform stirrup (5), a prefabricated bridge pier (6), a prefabricated pier head (7), a prefabricated bridge pier main rib (8) and a bridge pier stirrup (9);
the bearing platform (1) is a cast-in-place bearing platform, an anchor bolt adjusting system (3), a bearing platform top layer main rib (4) and a bearing platform stirrup (5) are embedded in the bearing platform (1), a bearing platform post-casting groove (2) is arranged at the position, corresponding to the prefabricated bridge pier (6), of the bearing platform (1), the anchor bolt adjusting system (3) is located on the periphery of the bearing platform post-casting groove (2), the upper end of the anchor bolt adjusting system (3) extends out of the bearing platform (1), and the bearing platform top layer main rib (4) and the bearing platform stirrup (5) are located on the top layer of the bearing platform (1);
the prefabricated bridge pier (6) is a factory prefabricated component, a prefabricated bridge pier main rib (8) is embedded in the prefabricated bridge pier main rib (8), the prefabricated bridge pier main rib (8) extends out of the prefabricated bridge pier (6), and a bridge pier stirrup (9) is fixed on the prefabricated bridge pier main rib (8); the extending ends of the pier stirrups (9) and the prefabricated pier main reinforcements (8) are placed in the bearing platform post-pouring groove (2);
the prefabricated pier heads (7) are symmetrically clamped at the bottom of the prefabricated pier (6), the upper end of the foundation bolt adjusting system (3) is connected with the prefabricated pier heads (7), and the foundation bolt adjusting system (3) is used for adjusting the verticality of the prefabricated pier (6); a plurality of exhaust holes (10) are formed in the prefabricated pier heads (7), the exhaust holes (10) are located above the bearing platform post-pouring groove (2), a pouring notch (11) is formed between the two prefabricated pier heads (7) which are symmetrically arranged, the pouring notch (11) is communicated with the bearing platform post-pouring groove (2), and fine aggregate concrete or UHPC is poured into the bearing platform post-pouring groove (2).
2. The adjustable slot-in type prefabricated pier stud and bearing platform connection structure of claim 1, wherein: the foundation bolt adjusting system (3) comprises foundation bolts, fastening nuts and adjusting cushion blocks, the foundation bolts are embedded in the bearing platform (1), and the upper ends of the foundation bolts are connected with the prefabricated pier heads (7) through the fastening nuts and the adjusting cushion blocks.
3. The adjustable slot-in type prefabricated pier stud and bearing platform connection structure of claim 1, wherein: the outward extension length of the main reinforcement (8) of the prefabricated pier is equal to the depth of the post-cast groove (2) of the bearing platform, and the requirement of anchoring length is met.
4. The adjustable slot-in type prefabricated pier stud and bearing platform connection structure of claim 1, wherein: the bearing platform post-cast groove (2) is characterized in that a bearing platform top layer main rib (4) and a bearing platform stirrup (5) are connected and pass through, and the plane positions of the bearing platform top layer main rib (4) and the bearing platform stirrup (5) are kept away from the positions of a prefabricated pier main rib (8) and a foundation bolt adjusting system (3).
5. The adjustable slot-in type prefabricated pier stud and bearing platform connection structure of any one of claims 1 to 4, wherein: the depth of the bearing platform post-pouring groove (2) is 120-150 cm, the size of the top surface is 10-15 cm larger than the size of the single side of the cross section of the prefabricated pier (6), the size of the bottom surface corresponds to the size of the cross section of the pier, and a chamfer of 10 multiplied by 10cm is arranged on the bottom surface.
6. The adjustable slot-in type prefabricated pier stud and bearing platform connection structure of claim 5, wherein: the prefabricated pier heads (7) are rectangular pieces and are symmetrically arranged along the transverse bridge direction of the prefabricated pier; the section size of the prefabricated pier head (7) is larger than that of the prefabricated pier, and the height of the prefabricated pier head is 30-50 cm.
7. A construction method for a connection structure of an adjustable slot-in type prefabricated pier stud and a bearing platform is characterized by comprising the following specific steps:
step one, constructing a bridge pile foundation and a cushion layer of a bearing platform;
step two, pouring a bearing platform (1) in situ, reserving a post-pouring groove (2) of the bearing platform, and pre-burying a foundation bolt adjusting system (3), a main reinforcement (4) at the top layer of the bearing platform and a hoop reinforcement (5) of the bearing platform;
thirdly, hoisting the prefabricated bridge pier (6), installing a prefabricated pier head (7), temporarily fixing the prefabricated bridge pier head through the foundation bolt adjusting system (3), and measuring the verticality of the prefabricated bridge pier;
adjusting the verticality of the prefabricated pier (6) by adopting the foundation bolt adjusting system (3) until the verticality meets the requirement, and fixing in place;
pouring a post-pouring groove of the bearing platform 2 by using fine aggregate concrete or UHPC through a pouring notch (11) and maintaining, wherein gas is exhausted from an exhaust hole (10) in the pouring process;
and step six, completing the connection of the prefabricated bridge pier and the bearing platform.
8. The construction method of the connection structure of the adjustable slot-in type prefabricated pier stud and the bearing platform according to claim 7, wherein: the top surface of the bearing platform (1) in the second step is processed to be smooth, and foundation bolts of the foundation bolt adjusting system (3) are embedded in the bearing platform (1); in the third step, the upper end of the foundation bolt is connected with the prefabricated pier head (7) through the fastening nut and the adjusting cushion block, the prefabricated pier head (7) is a rectangular piece and is symmetrically arranged along the transverse bridge direction of the prefabricated pier, the section size of the prefabricated pier head (7) is larger than that of the prefabricated pier, and the height of the prefabricated pier head is 30-50 cm.
9. The construction method of the connection structure of the adjustable slot-in type prefabricated pier stud and the bearing platform according to claim 7, wherein: and in the third step, the outward extending length of the main prefabricated pier rib (8) of the prefabricated pier (6) is equal to the depth of the bearing platform post-pouring groove (2) in the second step, the requirement of anchoring length is met, the depth of the reserved bearing platform post-pouring groove (2) is 120-150 cm, the top surface size is 10-15 cm larger than the single side of the section size of the prefabricated pier (6), the bottom surface size corresponds to the section size of the pier, and a chamfer of 10 multiplied by 10cm is arranged on the bottom surface.
10. The construction method of the adjustable slot-in type prefabricated pier stud and bearing platform connection structure according to any one of claims 7 to 9, wherein: and in the second step, the bearing platform top layer main ribs (4) and the bearing platform stirrups (5) are connected and pass through within the range of the bearing platform post-pouring groove (2), and the plane positions of the bearing platform top layer main ribs (4) and the bearing platform stirrups (5) are kept away from the positions of the prefabricated pier main ribs (8) and the foundation bolt adjusting systems (3) of the prefabricated pier (6) in the third step.
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Application publication date: 20210810 |