CN210238792U - Connecting structure for joint of new and old concrete members - Google Patents
Connecting structure for joint of new and old concrete members Download PDFInfo
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- CN210238792U CN210238792U CN201920684725.5U CN201920684725U CN210238792U CN 210238792 U CN210238792 U CN 210238792U CN 201920684725 U CN201920684725 U CN 201920684725U CN 210238792 U CN210238792 U CN 210238792U
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Abstract
The utility model provides a connecting structure of the joint of new and old concrete members, which comprises a new concrete member and an old concrete member which are arranged oppositely; a construction joint exists between the new concrete member and the old concrete member; a first stressed steel bar is horizontally embedded in the old concrete member, and a second stressed steel bar is horizontally embedded in the new concrete member; the first stressed steel bar and the second steel bar are used for supporting a new concrete member; the first stressed reinforcing steel bar and the second stressed reinforcing steel bar are coaxially connected through a reinforcing steel bar connector, the reinforcing steel bar connector is embedded in the old concrete member, and the end part of the reinforcing steel bar connector is externally arranged on the wall surface of the old concrete member opposite to the new concrete member; the old concrete member is provided with a water-swelling water stop strip on the wall surface opposite to the new concrete member; the construction joint between the new concrete member and the old concrete member is poured with concrete through the grouting guide pipe and the grouting pipe. The utility model is suitable for a buried depth is great, and ground water level is high, and the construction joint receives the condition of groundwater environmental impact for a long time.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a connecting structure for a joint of new and old concrete members.
Background
The Wuhan city track traffic line eight is an important town river-crossing track traffic backbone line in the Wuhan track traffic line network, wherein the bamboo leaf mountain bike station is positioned at a rotary disc of a bamboo leaf mountain of Huangpu Dajie to develop the northwest corner of the avenue. And the project of green landscape and underground space utilization in the eight-line field square of rail transit in Wuhan city is a demonstration project for developing subway property in Wuhan city and is also a model for combining urban landscape and municipal infrastructure. The field and square project occupies 32356 square meters, has two underground layers, and is structurally connected with the main structure of the station into a whole by large modern commercial complexes at the north and south sides.
Due to the shortage of traffic passing time of the eight lines, the main structure of the bamboo mountain station needs to be constructed in advance, and after the construction of the main structure of the station is finished, the construction of underground commercial structures at the north and south sides is carried out. The project belongs to an underground structure, the waterproof requirement is strict, a main structure cannot be provided with a permanent structural seam, the maximum longitudinal length of the whole structure is 225m, and the maximum transverse width is 120 m. According to the specification of concrete structure design specification GB50010-2010(2015 revision), expansion joints are required to be arranged when the length exceeds 55m, so that the temperature stress of the project structure is very large during use, and the middle part of the project structure is provided with a large elliptic hole, so that the stress is complex. By combining the factors, the safety and the waterproof effect of the connection between the property structures on the north and south sides and the finished station structure directly influence the normal operation of the track traffic No. 8 line and the life safety of passengers and citizens.
At present, two problems exist in the reinforced concrete structure constructed underground in stages, wherein the first problem is the connection of the reinforcing steel bars at the interface of new and old concrete; the second is the waterproof problem at the juncture of the new and old concrete. The traditional method is to solve the connection problem of reinforced concrete structures constructed in stages by arranging post-cast strips or post-embedded steel bar technology, and solve the waterproof problem of construction joints by embedding expansion water stop bars.
For the project, on one hand, the construction of the station ground connecting wall and the main structure is completed in advance, the property foundation pits on the south and north sides are not excavated, and the stress steel bars at the joint can not be bound in advance, so that a post-cast strip can not be arranged. On the other hand, the basement has larger sizes in the length and width directions, and the atrium position is directly influenced by the change of the external temperature, so that the temperature stress of the whole structure is larger. The stress reinforcing steel bar with the diameter of 32mm needs to be selected for the beam connected with the station longitudinally, if the post-bar planting technology is adopted, the depth of the structure to be planted in the station is not less than 850mm, the number of the longitudinal stress reinforcing steel bars of the beam is large, the space is dense, the requirements of the bar planting depth and the bar planting space cannot be met in site construction, and the bar planting quality cannot be met.
The service life of the project is 100 years, and the project is regulated according to concrete structure reinforcement design code GB 50367-2013: when the reinforcing material of the structure contains synthetic resin or other polymer components, the service life of the reinforced structure is preferably considered as 30 years; and after the service life is expired, when the reliability identification is carried out again and the structure is considered to work normally, the service life can be prolonged continuously. The engineering bar planting is deeply buried underground, the bar planting glue is greatly influenced by the environment such as underground water, soil and the like for a long time, and the later inspection is inconvenient. Therefore, the project can not solve the problem of connection between the property structure and the station structure through the post-bar planting technology.
The project bottom plate is located 15m underground, underground water is abundant, the connection part of the property and the station faces the danger of groundwater infiltration for a long time, and according to the experience of the built track traffic underground structure in Wuhan city, the problem of water seepage of the structural construction joint cannot be thoroughly solved only by arranging the expansion water stop strip due to the objective factors such as narrow construction operation surface and the like.
Disclosure of Invention
The invention aims to provide a connecting structure of a joint of new and old concrete members, which aims to overcome the defects of the prior art, is applied to a reinforced concrete structure which cannot be constructed in stages by using a conventional post-planting bar or a post-pouring belt, and is suitable for the conditions of large buried depth, high underground water level and long-term influence of underground water environment on construction joints.
The invention provides a connecting structure of a joint of a new concrete member and an old concrete member, which is characterized by comprising the new concrete member and the old concrete member which are oppositely arranged; a construction joint exists between the new concrete member and the old concrete member; a first stressed steel bar is horizontally embedded in the old concrete member, and a second stressed steel bar is horizontally embedded in the new concrete member; the first stressed steel bar and the second steel bar are used for supporting a new concrete member; the first stressed reinforcing steel bar and the second stressed reinforcing steel bar are coaxially connected through a reinforcing steel bar connector, the reinforcing steel bar connector is embedded in the old concrete member, and the end part of the reinforcing steel bar connector is exposed out of the wall surface of the old concrete member opposite to the new concrete member; the old concrete member is provided with a water swelling water stop bar and an embedded grouting pipe on the wall surface opposite to the new concrete member along the horizontal extension direction of the wall surface, and the grouting pipe is communicated with an embedded grouting guide pipe; the construction joint between the new concrete member and the old concrete member is poured with concrete through the grouting guide pipe and the grouting pipe.
In the technical scheme, the external part of the old concrete member is provided with a ground connection wall; the construction joint is located above the diaphragm wall.
Among the above-mentioned technical scheme, meet water inflation sealing rod and include the twice, parallel distribution about on the wall of old concrete.
Among the above-mentioned technical scheme, the slip casting pipe sets up in the central line department of interface between new concrete component and the old concrete component, and is located simultaneously between the two water-swelling sealing rod of meeting water.
Among the above-mentioned technical scheme, the slip casting pipe is fixed with the ligature of first atress reinforcing bar or second atress reinforcing bar, and the end of drawing forth of slip casting reinforcing bar is protruding in new concrete member and old concrete member top surface.
In the technical scheme, the concrete interface treating agent is coated on the wall surface of the old concrete member opposite to the new concrete member.
The invention provides a connecting method for a joint of new and old concrete members, which is characterized by comprising the following steps:
s1, pre-burying a first stressed steel bar while constructing an old concrete member, screwing a steel bar connector into one end of the first stressed steel bar adjacent to a new concrete member, and sealing the steel bar connector by using a connector protective cover;
s2, chiseling a ground connection wall between the old concrete member and the new concrete member while constructing the new concrete member, chiseling a wall surface opposite to the old concrete member, exposing the embedded steel bar connector, painting a concrete interface agent on the exposed section of the old concrete member, cleaning the steel bar connector by using soapy water, and screwing second stressed steel bars into the steel bar connector one by one to ensure reliable connection;
s3, arranging an upper water-swelling sealing strip and a lower water-swelling sealing strip on the exposed wall surface of the old concrete component;
s4, embedding a grouting pipe and a grouting guide pipe;
and S5, after the new concrete member is constructed and precipitation is stopped, performing secondary grouting on the construction joint between the old concrete member and the new concrete member through the grouting pipe and the grouting guide pipe.
In the technical scheme, in the step S3, the selected water-swelling water stop strip has a slow expansion function, the expansion rate of 7 days is not more than 60% of the final expansion rate, the final expansion rate is not more than 220%, the water-swelling water stop strip is fixed with the exposed wall surface of the old concrete component by adopting cement nails, and the distance between the cement nails is 300-500 mm; the water-swelling water stop strip is adhered to the exposed wall surface of the old concrete member by adopting a chloroprene rubber adhesive.
In the above technical solution, in step S2, the thickness of the new and old concrete members should not be less than 100mm, the wall surface of the old concrete member within the range of installing the grouting pipe may not be roughened and kept flat, and waterproof mortar may be used to perform local leveling to ensure that any part of the grouting pipe is closely attached to the wall surface of the old concrete member and that the grouting pipe should not have a suspended part.
In the technical scheme, the fixed distance of the grouting pipes is preferably 200-300 mm, wherein the fixed distance refers to the distance of fixed points for fixing the grouting pipes, and the fixed points are distributed along the length direction of the grouting pipes; arranging a grouting guide pipe at intervals of 8-13 m along the direction of the grouting pipe to be connected with the grouting pipe, wherein the length of the grouting guide pipe led out of the construction joint is not smaller than 150 mm; the outlet end of the grouting guide pipe is temporarily plugged before the grouting guide pipe is constructed and installed so as to prevent foreign matters from entering.
The invention adopts the steel bar connector to connect the stressed steel bars, has mature technology, reliable performance and high joint inspection qualification rate, and can effectively transmit the internal force. By adopting the method of reserving the steel bar connector, the problem of internal force transmission at the construction joint can be directly and effectively solved under the condition that post-embedded steel bars cannot be adopted and post-cast strips cannot be arranged, particularly in the projects with large length in the length direction and the width direction of the underground structure and large temperature stress during use, the technology can effectively resist the accumulated stress at the construction joint, not only can effectively ensure the structural safety of the construction joint, but also can greatly reduce the possibility that the construction joint is cracked due to the temperature stress. The embedded steel bar connector has simple process, good centering performance, no open fire operation and no special construction period requirement, can greatly shorten the construction period and reduce the investment compared with a post-embedded steel bar and a method for arranging a post-cast strip, and has obvious economic benefit. According to the invention, two expansion water stop strips are arranged above and below the contact surface of the new and old concrete structures, and the grouting pipe is embedded between the expansion water stop strips, so that three lines of defense are provided for waterproofing of the construction joints of the new and old concrete structures, and the possibility of water seepage of the construction joints of the underground structures, which are influenced by underground water environments for a long time, is greatly reduced.
Drawings
FIG. 1 is a schematic view of the construction range of the embodiment;
FIG. 2 is a schematic view of the present invention.
Detailed Description
The invention will be further described in detail with reference to the following drawings and specific examples, which are not intended to limit the invention, but are for clear understanding.
The invention provides a connecting structure for a joint of a new concrete member and an old concrete member, which is characterized by comprising the new concrete member and the old concrete member which are oppositely arranged. The two parts of the new concrete member and the old concrete member which are oppositely arranged are mainly because the concrete members are influenced by construction sites, processes and the like, can not be constructed simultaneously or are provided with reserved steel bars for post-pouring, and need to be constructed twice in sequence to generate the two parts of the new and old concrete members. A construction joint for uniformly binding the stress reinforcing steel bars which cannot be reserved exists between the new concrete member and the old concrete member; a first stressed steel bar is horizontally embedded in the old concrete member, and a second stressed steel bar is horizontally embedded in the new concrete member; the first stressed steel bar and the second steel bar are used for supporting a new concrete member; through the effective connection of the first stressed reinforcing steel bar and the second reinforcing steel bar, the concrete parts poured successively form a stressed whole. The first stressed reinforcing steel bar and the second stressed reinforcing steel bar are coaxially connected through a reinforcing steel bar connector, the reinforcing steel bar connector is embedded in the old concrete member, and the end part of the reinforcing steel bar connector is exposed out of the wall surface of the old concrete member opposite to the new concrete member; and before new concrete is poured, chiseling the old concrete protective layer to leak the embedded steel bar connector. The old concrete member is provided with a water swelling water stop bar and an embedded grouting pipe as a first underground anti-seepage line along the horizontal extension direction of the wall surface on the wall surface opposite to the new concrete member, and the grouting pipe is communicated with an embedded grouting guide pipe; the construction joint between the new concrete member and the old concrete member is poured with concrete through the grouting guide pipe and the grouting pipe. The joint of the new concrete and the old concrete is arranged between two water swelling water stop bars, a grouting pipe and a grouting guide pipe are embedded and used as a second underground water seepage-resisting defense line
In the technical scheme, the external part of the old concrete member is provided with a ground connection wall; the construction joint is located above the diaphragm wall. Because of the construction process, the exterior of the old concrete member which is constructed earlier is provided with the diaphragm wall which is constructed earlier, and the concrete member which spans the diaphragm wall can only be constructed in two parts successively under the influence of the diaphragm wall, so that the same concrete member is formed, and the new and old concrete parts which are constructed in two times accept construction joints which can not be uniformly bound by reinforcing steel bars. The construction joint is positioned above the diaphragm wall, and when the new concrete part is constructed, the diaphragm wall part at the interface of the new concrete and the old concrete needs to be chiseled.
Among the above-mentioned technical scheme, meet water inflation sealing rod and include the twice, parallel distribution about on the wall of old concrete.
Among the above-mentioned technical scheme, the slip casting pipe sets up in the central line department of interface between new concrete component and the old concrete component, and is located simultaneously between the two water-swelling sealing rod of meeting water.
Among the above-mentioned technical scheme, the slip casting pipe is fixed with the ligature of first atress reinforcing bar or second atress reinforcing bar, and the end of drawing forth of slip casting reinforcing bar is protruding in new concrete member and old concrete member top surface. The leading-out end of the grouting guide pipe exceeds the top surface of the newly poured concrete member and is not smaller than 150 mm.
In the technical scheme, the concrete interface treating agent is coated on the wall surface of the old concrete member opposite to the new concrete member.
The invention provides a connecting method for a joint of new and old concrete members, which is characterized by comprising the following steps:
s1, pre-burying a first stressed steel bar while constructing an old concrete member, screwing a steel bar connector into one end of the first stressed steel bar adjacent to a new concrete member, and sealing the steel bar connector by using a connector protective cover;
s2, chiseling a ground connection wall between the old concrete member and the new concrete member while constructing the new concrete member, chiseling a wall surface opposite to the old concrete member, exposing the embedded steel bar connector, painting a concrete interface agent on the exposed section of the old concrete member, cleaning the steel bar connector by using soapy water, and screwing second stressed steel bars into the steel bar connector one by one to ensure reliable connection;
s3, arranging an upper water-swelling sealing strip and a lower water-swelling sealing strip on the exposed wall surface of the old concrete component;
s4, embedding a grouting pipe and a grouting guide pipe;
and S5, after the new concrete member is constructed and precipitation is stopped, performing secondary grouting on the construction joint between the old concrete member and the new concrete member through the grouting pipe and the grouting guide pipe.
In the technical scheme, in the step S3, the selected water-swelling water stop strip has a slow expansion function, the expansion rate of 7 days is not more than 60% of the final expansion rate, the final expansion rate is not more than 220%, the water-swelling water stop strip is fixed with the exposed wall surface of the old concrete component by adopting cement nails, and the distance between the cement nails is 300-500 mm; the water-swelling water stop strip is adhered to the exposed wall surface of the old concrete member by adopting a chloroprene rubber adhesive.
In the above technical solution, in step S2, the thickness of the new and old concrete members should not be less than 100mm, the wall surface of the old concrete member within the range of installing the grouting pipe may not be roughened and kept flat, and waterproof mortar may be used to perform local leveling to ensure that any part of the grouting pipe is closely attached to the wall surface of the old concrete member and that the grouting pipe should not have a suspended part.
In the technical scheme, the fixed distance of the grouting pipes is preferably 200-300 mm, wherein the fixed distance refers to the distance of fixed points for fixing the grouting pipes, and the fixed points are distributed along the length direction of the grouting pipes; arranging a grouting guide pipe at intervals of 8-13 m along the direction of the grouting pipe to be connected with the grouting pipe, wherein the length of the grouting guide pipe led out of the construction joint is not smaller than 150 mm; the outlet end of the grouting guide pipe is temporarily plugged before the grouting guide pipe is constructed and installed so as to prevent foreign matters from entering.
As shown in the attached drawing 1, the prior construction of the main structure of the bamboo leaf mountain station of track traffic No. 8 line of track traffic in 1-Wuhan city is completed, and the 2-north property structure and the 3-south property structure start to be constructed synchronously after the construction of the main structure of the station is completed, so that two construction joints 4 and 5 are formed.
The concrete construction steps of the embodiment are as follows:
as shown in the attached drawing 2, when constructing the main structure of the bamboo mountain (i.e. the old concrete member), the stressed steel bars 14 (i.e. the first stressed steel bars) of the property structure need to be pre-embedded in advance, the pre-embedded length is required to be not less than the anchoring length of the tensioned steel bars, and the ends of the reserved steel bars adjacent to the property structure are processed by threading according to the model of the connector, the steel bar connector 13 is screwed into the reserved first stressed steel bars, the connector protective cover is selected to seal the steel bar connector 13, so that the problems of steel bar connector tooth wire damage or steel bar reinforcement wire damage and the like caused by later-stage concrete chiseling are prevented, and after the pre-embedded processing of the steel bar connector is completed, the concrete (i.e. the old concrete member) of the.
When the main structure 9 of the property (namely, a new concrete member) is constructed, the diaphragm wall 11 of the interface of the new and old concrete members needs to be chiseled firstly, the contact surface of the new and old concrete is chiseled, the reserved steel bar connector 13 is leaked, a concrete interface agent 12 is brushed, and then the steel bar connector is cleaned by using soapy water, and then the steel bars (namely, second stressed steel bars) which are connected with the structure of the station in the north-south property are screwed one by one to ensure that the connection is reliable.
An upper water-swelling water stop strip and a lower water-swelling water stop strip 15 are arranged on a contact surface (namely a wall surface opposite to an old concrete component and a new concrete component), the selected water-swelling water stop strips have a slow swelling function, the 7-day swelling rate is not more than 60% of the final swelling rate, the final swelling rate is not more than 220%, the swelling water stop strips are required to be closely attached to the contact surface, cement nails are used for fixing, the distance between the cement nails is 300-500 mm, and chloroprene rubber adhesive is used for adhering, so that the water stop strips are firmly and closely attached to the contact surface.
The grouting pipe 17 is embedded between the two water swelling water stop strips, the grouting pipe is suitable to be arranged at the center line position of a construction joint, the thickness of concrete on any side is not smaller than 100mm, a base layer in the range of installing the grouting pipe, namely the section of an old concrete member, can be prevented from being roughened and kept flat, and waterproof mortar is adopted to carry out local leveling if necessary so as to ensure that any part of the grouting pipe is closely attached to the surface of the construction joint and the grouting pipe is not required to have a suspended part. The fixed spacing of the grouting pipes is preferably 200-300 mm, and the fixation should be firm and reliable. Arranging a grouting guide pipe 16 at intervals of 8-13 m along the direction of the grouting pipe to be connected with the grouting pipe, wherein at least one part of the grouting guide pipe embedded in the concrete is firmly bound with the first or second stressed steel bar, and the length of the guide pipe led out of the concrete is not less than 150 mm; the outlet end of the grouting conduit is arranged at a convenient and easy-to-access position, and the open end of the conduit is temporarily blocked to prevent foreign matters from entering. The position easy to be accessed is a place where secondary grouting construction operation is conveniently carried out on site
After the construction of the south-north property part structure is finished and the precipitation is stopped, secondary grouting is carried out at the construction joint through the grouting pipes, inorganic grouting materials such as self-leveling cement and superfine cement are selected, chemical grouting materials such as epoxy resin, polyurethane and acrylic acid are also selected, and all pre-buried grouting pipes are subjected to grouting plugging.
The two expansion water stop strips and the embedded grouting pipe are the three water seepage prevention lines.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
Claims (6)
1. A connecting structure of a joint of a new concrete member and an old concrete member is characterized by comprising the new concrete member and the old concrete member which are oppositely arranged; a construction joint exists between the new concrete member and the old concrete member; a first stressed steel bar is horizontally embedded in the old concrete member, and a second stressed steel bar is horizontally embedded in the new concrete member; the first stressed steel bar and the second steel bar are used for supporting a new concrete member; the first stressed reinforcing steel bar and the second stressed reinforcing steel bar are coaxially connected through a reinforcing steel bar connector, the reinforcing steel bar connector is embedded in the old concrete member, and the end part of the reinforcing steel bar connector is exposed out of the wall surface of the old concrete member opposite to the new concrete member; the old concrete member is provided with a water swelling water stop bar and an embedded grouting pipe on the wall surface opposite to the new concrete member along the horizontal extension direction of the wall surface, and the grouting pipe is communicated with an embedded grouting guide pipe; the construction joint between the new concrete member and the old concrete member is poured with concrete through the grouting guide pipe and the grouting pipe.
2. The connection structure of a new and old concrete member joint according to claim 1, wherein: the outside of the old concrete member is provided with a ground connecting wall; the construction joint is located above the diaphragm wall.
3. The joint structure of new and old concrete members according to claim 2, wherein the water-swelling stop strips include two strips, which are arranged in parallel on the wall surface of the old concrete.
4. The joint structure of new and old concrete members according to claim 3, wherein the grouting pipe is provided at the center line of the interface between the new concrete member and the old concrete member and is simultaneously located between the two water-swelling water stops.
5. The joint structure of new and old concrete members according to claim 4, wherein the grouting guide is bound and fixed to the first or second load-bearing reinforcing bars, and the leading ends of the grouting reinforcing bars protrude from the top surfaces of the new and old concrete members.
6. The joint structure of new and old concrete structural members according to claim 4, wherein the old concrete structural members are coated with a concrete interface treatment agent on the wall surface opposite to the new concrete structural members.
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| CN201920684725.5U CN210238792U (en) | 2019-05-14 | 2019-05-14 | Connecting structure for joint of new and old concrete members |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110067311A (en) * | 2019-05-14 | 2019-07-30 | 长江勘测规划设计研究有限责任公司 | The connection structure and method of new-old concrete component junction |
| CN112609746A (en) * | 2020-12-11 | 2021-04-06 | 中国建筑第五工程局有限公司 | New and old basement joint concrete waterproof component and construction method thereof |
-
2019
- 2019-05-14 CN CN201920684725.5U patent/CN210238792U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110067311A (en) * | 2019-05-14 | 2019-07-30 | 长江勘测规划设计研究有限责任公司 | The connection structure and method of new-old concrete component junction |
| CN110067311B (en) * | 2019-05-14 | 2024-04-12 | 长江勘测规划设计研究有限责任公司 | Connection structure and method for joint of new and old concrete members |
| CN112609746A (en) * | 2020-12-11 | 2021-04-06 | 中国建筑第五工程局有限公司 | New and old basement joint concrete waterproof component and construction method thereof |
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