CN112814004B - Construction method of underground frame foundation connection structure - Google Patents
Construction method of underground frame foundation connection structure Download PDFInfo
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- CN112814004B CN112814004B CN202011632096.5A CN202011632096A CN112814004B CN 112814004 B CN112814004 B CN 112814004B CN 202011632096 A CN202011632096 A CN 202011632096A CN 112814004 B CN112814004 B CN 112814004B
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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Abstract
The invention discloses a construction method of a foundation connection structure of an underground frame, which comprises the following steps: determining a groove body side line, prefabricating a first construction section reinforcement cage, a first construction section joint, a second construction section reinforcement cage and a second construction section joint; excavating a groove section of a first construction section according to a groove body side line, lowering a reinforcement cage of the first construction section and a joint of the first construction section, and pouring concrete to the groove section of the first construction section to form a first frame foundation; excavating a rear construction section groove section according to a groove body side line, lowering a rear construction section joint and a rear construction section reinforcement cage, oppositely placing the rear construction section joint and the first construction section joint to form a joint box, and then pouring concrete to the rear construction section groove section to form a second frame foundation; and connecting the first frame foundation and the second frame foundation in the joint box, and pouring concrete into the joint box to finish construction. The invention can effectively transmit bending moment load and solve the problem that the bending resistance and the shearing resistance of the continuous underground frame foundation at the construction joint are weak.
Description
Technical Field
The invention relates to the technical field of buildings, in particular to a construction method of an underground frame foundation connection structure.
Background
Along with the increasing requirements of China on environmental protection, in order to reduce the excavated volume, a novel separated frame foundation of a suspension bridge gravity anchor is provided. The frame foundation is composed of separated continuous underground frame foundations, the continuous underground frame foundations are constructed in a segmented pouring mode, namely, a pair of underground frame foundation groove sections are dug firstly, then a reinforcement cage is placed downwards, concrete is poured, construction of the next underground frame foundation groove section is conducted after the underground frame foundations reach certain strength, and finally the continuous underground frame foundations are formed. In order to meet the construction method and ensure the connection requirement of two underground frame foundations constructed successively, an underground frame foundation joint is required to be arranged at the joint of the two underground frame foundations.
At present, the underground frame foundation joint mainly comprises a joint pipe joint, a joint box joint, an I-shaped steel joint, a precast concrete box joint and the like, a first pouring section and a second pouring section can be connected into a continuous whole through the underground frame foundation joint, but the first pouring section and the second pouring section at the joint of the traditional underground frame foundation are connected together only through concrete, if the joint is used as a water-intercepting structure, a seepage-proofing structure, a water-retaining structure or a soil-retaining structure, certain bearing requirements can be met, if the joint is used as a part of the frame foundation and needs to bear larger load, a wall body of the continuous underground frame foundation can generate larger bending moment under the action of passive soil pressure, and the underground frame foundation joint formed by the connection mode cannot effectively transmit the bending moment load, so that the midspan bending moment of the continuous underground frame foundation is extraordinarily large, and serious safety hazards exist.
Disclosure of Invention
Therefore, it is necessary to provide a construction method of an underground frame foundation connection structure, which is convenient to construct, reasonable in cost and capable of effectively transmitting bending moment loads, aiming at the problems.
The invention is realized by the following technical scheme:
a construction method of an underground frame foundation connection structure comprises the following steps:
s1, determining groove body side lines of a first construction section and a second construction section, prefabricating a first construction section steel bar cage, a first construction section joint, a second construction section steel bar cage and a second construction section joint, wherein the first construction section joint is connected with the end part of the first construction section steel bar cage, and the second construction section joint is connected with the end part of the second construction section steel bar cage;
s2, excavating a groove section of a first construction section according to a side line of the groove body, lowering a reinforcement cage of the first construction section and a joint of the first construction section, and pouring concrete into the groove section of the first construction section to form a first frame foundation;
s3, after the strength of concrete in the first construction section meets design requirements, excavating a groove section of the second construction section according to the side line of the groove body, putting a joint of the second construction section and a reinforcement cage of the second construction section, oppositely placing the joint of the second construction section and the joint of the first construction section to form a joint box, and pouring concrete to the groove section of the second construction section to form a second frame foundation;
and S4, after the strength of the concrete in the post-construction section meets the design requirement, connecting the first frame foundation and the second frame foundation in the joint box, and then pouring the concrete into the joint box to complete construction.
In one embodiment, the joint of the first construction section is connected with the end part of the reinforcement cage of the first construction section, and the joint of the first construction section is fixedly connected with the end part of the horizontal reinforcement of the reinforcement cage of the first construction section in a penetrating way; the end connection of rear construction section joint and rear construction section steel reinforcement cage, including the fixed connection of wearing to establish of the tip and the rear construction section joint of the horizontal reinforcing bar of rear construction section steel reinforcement cage.
In one embodiment, connecting the first frame foundation and the second frame foundation comprises: and (3) connecting the joints of the construction sections firstly and then, and/or connecting the horizontal steel bars of the reinforcement cage of the construction sections firstly and then.
In one embodiment, the pre-construction segment slot segments and the post-construction segment slot segments are grooved by chiseling and milling, and a mud dado is used during the grooving process.
In one embodiment, casting concrete into the pre-construction section trough section to form the first frame foundation includes: and pouring concrete into the area where the reinforcement cage of the previous construction section is located, and synchronously backfilling block stones into the joint of the previous construction section to form the support.
In one embodiment, when the groove section of the construction section is excavated, the rock blocks backfilled in the joint of the construction section are removed; the construction section groove section concreting behind forms second frame foundation includes: and pouring concrete to the area where the reinforcement cage is located at the rear construction section, and synchronously backfilling gravel into the joint box to form the support.
In one embodiment, before connecting the first frame base and the second frame base, the method further includes: the sand and stone in the joint box are sucked out through the vacuum mud sucking device.
In one embodiment, after the sand in the joint box is sucked out, the method further comprises the following steps: the inside of the joint box is cleaned.
In one embodiment, the method for connecting the horizontal steel bars of the reinforcement cage at the previous construction section with the horizontal steel bars of the reinforcement cage at the later construction section includes: correspondingly connecting the horizontal steel bars of the reinforcement cage at the first construction section with the horizontal steel bars of the reinforcement cage at the later construction section through connecting steel bars; the first end of connecting reinforcement and the tip mechanical connection of a horizontal reinforcement, the second end of connecting reinforcement and the tip welding of another horizontal reinforcement.
In one embodiment, the connection of the connecting bars to the horizontal bars at both ends thereof is performed alternately in the vertical direction.
Compared with the prior art, the technical scheme of the invention at least has the following advantages and beneficial effects:
the joint and the reinforcement cage are prefabricated into a whole to be integrally installed in a downward mode, so that errors caused by downward installation and sectional connection are reduced, installation accuracy is controlled, and meanwhile, the reduction of the impermeability of a joint due to long construction time is avoided; and the first construction section and the second construction section are connected into a whole in the joint, so that the functions of seepage prevention, bearing, water retaining, soil retaining and the like of the original joint are maintained, the bending moment load can be effectively transmitted, and the problem of overlarge mid-span bending moment of the continuous underground frame foundation is solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a first schematic diagram illustrating a first construction step of a method for constructing an underground frame foundation connection structure according to an embodiment of the present invention;
FIG. 2 is a second schematic diagram illustrating the construction steps of the method for constructing the underground frame foundation connection structure according to the embodiment of the present invention;
FIG. 3 is a third schematic diagram illustrating the construction steps of the method for constructing the underground frame foundation connection structure according to the embodiment of the invention;
FIG. 4 is a fourth schematic diagram illustrating the construction steps of the construction method of the underground frame foundation connection structure according to the embodiment of the invention;
FIG. 5 is a fifth schematic view illustrating the construction steps of the method for constructing the underground frame foundation connection structure according to the embodiment of the present invention;
fig. 6 is a schematic diagram six of construction steps of a construction method of an underground frame foundation connection structure according to an embodiment of the invention;
fig. 7 is a seventh schematic construction step diagram of a construction method of an underground frame foundation connection structure provided by the embodiment of the invention;
fig. 8 is a schematic view eight of construction steps of a construction method of an underground frame foundation connection structure according to an embodiment of the present invention;
fig. 9 is a schematic view nine illustrating the construction steps of the construction method of the underground frame foundation connection structure according to the embodiment of the present invention;
FIG. 10 is a schematic structural diagram of an underground frame foundation connection structure provided by an embodiment of the invention;
fig. 11 is a schematic view of an assembly structure of a v-shaped connector 21274provided by the embodiment of the invention.
Icon: 1-a first frame foundation, 11-a first construction section reinforcement cage, 111-a first construction section reinforcement cage horizontal reinforcement, 12-a first construction section joint, 2-a second frame foundation, 21-a second construction section reinforcement cage, 211-a second construction section reinforcement cage horizontal reinforcement, 22-a second construction section joint, 3-rock, 4-gravel, 5-concrete, 6-connecting reinforcement, 61-mechanical connecting ends, 62-welded connecting ends, 7-rigid connecting members, 8-21274; form joints, 81-panels, 811-webs, 812-side panels, 82-frameworks, 821-vertical supports, 822-horizontal supports, 8221-first stiffening ribs, 8222-second stiffening ribs, 8223-third stiffening ribs, 83-grout stopping devices, 831-first side walls, 832-second side walls, 84-shear bars.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, a construction method of a foundation connection structure of an underground frame will be more clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The preferred embodiments of the construction method of the underground frame foundation connection structure are shown in the drawings, but the construction method of the underground frame foundation connection structure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. The use of the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like in the orientations and positional relationships indicated herein are based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship normally found in the product of the present invention, are intended to facilitate the description and the simplification of the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
In the description of the present invention, it should be further noted that the terms "disposed," "installed," "connected" and "connected" used herein should be interpreted broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1 to 10, an embodiment of the present invention provides a construction method of a foundation connection structure of an underground frame, including the following steps:
s1, determining groove body side lines of a first construction section and a second construction section, prefabricating a first construction section reinforcement cage 11, a first construction section joint 12, a second construction section reinforcement cage 21 and a second construction section joint 22, wherein the first construction section joint 12 is connected with the end part of the first construction section reinforcement cage 11, and the second construction section joint 22 is connected with the end part of the second construction section reinforcement cage 21;
s2, excavating a groove section of a first construction section according to a groove body side line, lowering a reinforcement cage 11 of the first construction section and a joint 12 of the first construction section, and pouring concrete to the groove section of the first construction section to form a first frame foundation 1;
s3, after the strength of concrete in the first construction section meets design requirements, excavating a groove section of the later construction section according to a groove body side line, lowering a joint 22 of the later construction section and a reinforcement cage 21 of the later construction section, enabling the joint 22 of the later construction section and the joint 12 of the first construction section to be oppositely arranged to form a joint box, and then pouring concrete to the groove section of the later construction section to form a second frame foundation 2;
and S4, after the strength of the concrete in the post-construction section meets the design requirement, connecting the first frame foundation 1 and the second frame foundation 2 in the joint box, and then pouring expanded concrete 5 into the joint box to complete construction.
Specifically, first construction section joint 12 and back construction section joint 22 are the rigid joint that the shape structure is the same, including panel 81 and the skeleton 82 that covers on panel 81, panel 81 can be made by the steel sheet, skeleton 82 can be made by angle steel or channel-section steel, after the installation is accomplished in the construction section, first construction section joint 12 and back construction section joint 22 are the relative and symmetrical setting of opening, form the joint box, the joint box can be separated into first construction section, back construction section and joint box with whole construction section, cut off the construction section effectively and prevent the thick liquid overflow in the construction, realize the orderly construction of segmentation substep.
It can be understood that the excavation of the groove section of the first construction section can be excavation according to the side line of the groove body, and the overexcavation can also be performed at the connecting end of the first construction section and the later construction section so as to form an overexcavation area, so that the lowering installation of the joint 12 of the first construction section and the reinforcement cage 11 of the first construction section is facilitated. The groove sections of the first construction section and the second construction section can be milled into grooves by a groove milling machine or a double-wheel groove milling machine through chiseling, and the slurry retaining wall is adopted in the groove forming process, so that the phenomenon of hole collapse or soil falling does not occur in the grooves due to the adjustment of the concentration of the slurry.
It can be understood that the joint 12 of the first construction section is connected with the end of the reinforcement cage 11 of the first construction section, and mainly the end of the horizontal reinforcement 111 of the reinforcement cage of the first construction section is fixedly connected with the joint 12 of the first construction section, so that the reinforcement cage 11 of the first construction section and the joint 12 of the first construction section are integrally prefabricated into a whole, and the lowering and installation are convenient; similarly, the rear construction section joint 22 is connected to the end of the rear construction section reinforcement cage 21, and the same as the above description is omitted.
It can be understood that the first frame foundation 1 is formed by pouring concrete to the groove section of the first construction section, mainly the concrete is poured to the area where the reinforcement cage 11 of the first construction section is located, and concrete is not poured in the joint 12 of the first construction section for subsequent connection; similarly, the second frame foundation 2 is formed by pouring concrete into the groove section of the backward construction section, and concrete is poured into the area where the reinforcement cage 21 of the backward construction section is located, and then concrete is not poured into the joints 22 of the backward construction section, so that the joints 12 of the forward construction section and the joints 22 (i.e., joint boxes) of the backward construction section are connected in sequence.
After the first frame foundation 1 and the second frame foundation 2 are connected into a whole by the method, the functions of seepage prevention, bearing, water retaining, soil retaining and the like of an original joint are kept, meanwhile, the bending moment load can be effectively transmitted, and the problem of overlarge mid-span bending moment of the continuous underground frame foundation is solved.
Further, as shown in fig. 3, 6 and 10, the joint 12 of the first construction section is connected to the end of the reinforcement cage 11 of the first construction section, and the end of the horizontal reinforcement 111 of the reinforcement cage of the first construction section is fixedly connected to the joint 12 of the first construction section in a penetrating manner, and after the end of the horizontal reinforcement 111 of the reinforcement cage of the first construction section passes through the joint 12 of the first construction section, the joint is fixedly connected to the penetrating position by welding and the penetrating hole is closed, so that the effects of stopping grout and preventing overflow are achieved; similarly, the end connection of the rear construction section joint 22 and the rear construction section reinforcement cage 21, the end of the horizontal reinforcement 211 of the rear construction section reinforcement cage and the rear construction section joint 22 are fixedly connected in a penetrating manner, and the specific fixed penetrating connection mode is the same as the above, and is not repeated here. After the horizontal reinforcing steel bars and the joint are fixedly connected in a penetrating mode, the horizontal reinforcing steel bars extending into the joint can further improve the shearing resistance and the structural strength of the joint.
Further, as shown in fig. 8 and 10, the connecting the first frame base 1 and the second frame base 2 includes: the joint 12 at the first construction section is connected with the joint 22 at the second construction section, and as the main stress element for bearing horizontal transverse load by the rigid joint is located on the framework 82, in order to further enhance the overall structural strength and the bearing capacity of the joint, the opposite ends of the frameworks 82 of the two rigid joints are connected through the rigid connecting piece 7, and the rigid connecting piece 7 can be a channel steel or a steel plate, so that the frameworks 82 of the two rigid joints interact with each other to form a stable support; in addition, can also be connected the horizontal reinforcement 111 of the steel reinforcement cage of the first construction section with the horizontal reinforcement 211 of the steel reinforcement cage of the second construction section, should correspond the connected mode and can be connected if connecting reinforcement 6 or two horizontal reinforcement lug connections through the intermediate junction spare, and the connection between reinforcing bar and the reinforcing bar can be welding, mechanical connection (if connect through modes such as threaded sleeve) or ligature connection. It will be appreciated that both of these connection means are preferably present, but may alternatively be used, as long as both rigid joints are connected as a single unit.
Further, as shown in fig. 4, pouring concrete into the groove segment of the previous construction segment to form the first frame foundation 1 includes: the concrete is poured into the area where the reinforcement cage 11 of the first construction section is located, the block stones 3 are synchronously backfilled into the joint 12 of the first construction section to form a support, the block stones 3 can be pebbles, massive gravels or massive gravels, and the like, so that the support is formed inside the joint 12 of the first construction section, the joint 12 of the first construction section is prevented from being deformed due to extrusion on the joint 12 of the first construction section when the concrete is poured, and meanwhile, the quality of the wall protection slurry is prevented from being influenced when the excavation and the slurry wall protection are carried out on the later construction section. Specifically, when concrete is poured into the groove section of the first construction section, the guide pipe penetrates into the groove bottom to pour the concrete from bottom to top, slurry in the groove section is discharged in the pouring process, and the rock blocks 3 are backfilled synchronously when the concrete is poured, so that the pressure on two sides of the joint 12 of the first construction section is balanced, and when the strength of the concrete in the groove section of the first construction section meets the design requirement, the first frame foundation 1 is formed.
Further, as shown in fig. 5-7, when the post-construction section slot segment is excavated, the rock blocks 3 backfilled in the first-construction-section joint 12 can be synchronously removed, the post-construction-section joint and the post-construction-section reinforcement cage are placed under the post-construction-section slot segment to form a joint box, then concrete is poured into the region where the post-construction-section reinforcement cage 21 is located, and sand 4 is synchronously backfilled into the post-construction-section joint 22 to form a support, the sand 4 can be sand particles or loose gravel to form a support inside the joint box, so that the phenomenon that the post-construction-section joint 22 is extruded when concrete is poured in the post-construction-section slot segment to cause deformation of the post-construction-section joint 22 is avoided, and the loose and light characteristics of the sand 4 can be utilized to conveniently remove the sand 4 after the second frame foundation 2 is formed. Specifically, when concrete is poured into the groove section of the rear construction section, the guide pipe penetrates into the groove bottom to pour the concrete from bottom to top, slurry in the groove section is discharged in the pouring process, sand stones 4 are backfilled synchronously when the concrete is poured, pressure on two sides of the joint 22 of the rear construction section is balanced, and after the strength of the concrete in the groove section of the rear construction section meets the design requirement, the second frame foundation 2 is formed.
Further, as shown in fig. 8, after the second frame foundation 2 is formed, the gravel 4 in the joint box (i.e. the first construction section joint 12 and the second construction section joint 22) can be sucked out by a vacuum mud suction device, so as to connect the successive construction sections in the joint box; before the connection, can also wash the inside of joint case, get rid of the earth or the mud skin that bond on joint inner wall and the horizontal reinforcement tip to guarantee the effective connection between joint incasement concrete and reinforcing bar, improve the quality of concrete placement.
Further, as shown in fig. 8 to 10, the manner of connecting the horizontal bars 111 of the reinforcement cage at the first construction section with the horizontal bars 211 of the reinforcement cage at the second construction section includes: correspondingly connecting the horizontal steel bars 111 of the reinforcement cage at the first construction section with the horizontal steel bars 211 of the reinforcement cage at the later construction section through connecting steel bars 6; one end of connecting reinforcement 6 is mechanical link 61, and the other end is welding link 62, and the first end of connecting reinforcement 6 is connected with the tip machinery of a horizontal reinforcement promptly, and the second end of connecting reinforcement 6 welds with the tip of another horizontal reinforcement. Specifically, in order to avoid mutual interference caused by overlong horizontal reinforcing steel bars respectively penetrating through the joints, alignment installation is affected or workers enter the joints for construction, and therefore the horizontal reinforcing steel bars respectively penetrating through the two joints are designed not to exceed the joint position surfaces where the horizontal reinforcing steel bars are located. It can be understood that the connection mode of the horizontal steel bars and the connecting steel bars 6 is preferably a mechanical connection mode, but the positions of the horizontal steel bars at the two ends are fixed after the joints of the horizontal steel bars at the two ends are installed in place, so that only the position adjustment can be performed on the connecting steel bars 6, and the connection at the two ends of the connecting steel bars 6 is not easy to perform in a mechanical connection mode; in order to make horizontal reinforcing bar and connecting reinforcement 6 connect and link up, connecting reinforcement 6 can adopt the mode of one end mechanical connection one end welding, both ends all weld, one end mechanical connection one end ligature, one end welding one end ligature, the equal ligature in both ends with the connected mode of both ends horizontal reinforcing bar to go on, and the preferred one end mechanical connection one end welding that is preferred here to play the effect that economic suitability and connection stability have concurrently.
Further, as shown in fig. 10, the connection of the connection bars 6 to the horizontal bars at both ends thereof is sequentially performed alternately in the vertical direction. So as to play a role in reasonably distributing the vertical shearing force. Specifically, it can be understood that, at one end connected by welding, the connecting reinforcing bars 6 are in an interwoven state with the ends of the horizontal reinforcing bars, and the end parts of the two are overlapped in parallel, so as to facilitate welding; one end of connecting is being carried out through the mode of mechanical connection, connecting reinforcement 6 is located same straight line with the tip of horizontal reinforcing bar, and the mutual butt of the two terminal surfaces after connecting, consequently, there is the difference reinforcing bar length that the both ends junction corresponds, also can produce the disparity in undertaking of vertical shear force, set up in turn through the corresponding connected mode at connecting reinforcement 6 both ends in vertical direction this moment in proper order, the connected mode of last section connecting reinforcement 6 and both ends horizontal reinforcing bar is left end welding right-hand member mechanical connection promptly, the connected mode of next section connecting reinforcement 6 and both ends horizontal reinforcing bar is left end mechanical connection right-hand member welding, it is down until the joint bottom repeatedly in turn, thereby reach the purpose of carrying out rational distribution to vertical shear force.
In summary, the construction method provided by the invention comprises the following concrete implementation steps:
as shown in fig. 1, the installation position of the joint is determined by lofting the joint, and the side lines of the groove body and the overexcavation side line of the first construction section and the second construction section are determined and drawn;
as shown in fig. 2 and 3, the groove section of the first construction section is chiseled and milled into a groove according to the lofted groove body side line and the overexcavation side line to form a groove section of the first frame foundation 1 and an overexcavation area, a mud retaining wall is adopted in the groove forming process, and after the groove is formed, the prefabricated reinforcement cage 11 of the first construction section and the joint 12 of the first construction section are hoisted and installed in the groove section of the first construction section;
as shown in fig. 4, a guide pipe is used for deeply penetrating into the groove bottom of the groove section of the prior construction section to carry out concrete pouring from bottom to top, slurry in the groove section of the prior construction section and an overbreak area is discharged in the pouring process, and the inside of a joint 12 of the prior construction section is synchronously backfilled with lump stones 3 during the pouring;
as shown in fig. 5 and 6, after the strength of the concrete in the groove section of the first construction section meets the design requirement, the groove section of the second construction section is chiseled and milled into a groove according to the overexcavation side line, the rock block 3 backfilled in the joint 12 of the first construction section is removed in the groove forming process of the groove section of the second construction section, the slurry is used for protecting the wall while forming the groove, the prefabricated steel reinforcement cage 21 of the second construction section and the joint 22 of the second construction section are hung and installed in the groove section of the second construction section after forming the groove, and the joint 22 of the second construction section and the joint 12 of the first construction section are oppositely placed at the moment to form a joint box isolated from the first construction section and the second construction section;
as shown in fig. 7, a guide pipe is used for penetrating into the groove bottom of the groove section of the rear construction section to perform concrete pouring from bottom to top, slurry in the groove section of the rear construction section and the joint box is discharged in the pouring process, and sand stones 4 are synchronously backfilled in the joint box during pouring;
as shown in fig. 8, after the strength of the concrete in the groove section of the rear construction section meets the design requirement, the gravel 4 in the joint box is sucked out by a vacuum mud suction device, and the interior of the joint box is washed; after washing and cleaning are finished, connecting the framework of the later construction section joint 22 with the framework of the first construction section joint 12 through a rigid connecting piece 7 in the joint box, and connecting the horizontal steel bars 111 and the connecting steel bars 6 of the first construction section steel bar cage with the horizontal steel bars 211 of the later construction section steel bar cage to connect the first construction section and the later construction section into a whole;
as shown in fig. 9, after the first and second construction segments are connected, the micro-expansive concrete 5 is poured into the joint box, and the construction is completed.
Furthermore, as shown in fig. 10 and 11, the joint 12 of the first construction section or the joint 22 of the second construction section provided by the embodiment of the invention is a v-21274h-shaped joint 8, wherein the v-21274h-shaped joint 8 comprises a v-21274h-shaped panel 81 and a framework 82 arranged along the inner surface of the v-21274h-shaped panel 81, the framework 82 comprises a plurality of vertical supports 821 which are vertically arranged and horizontally distributed at intervals and a plurality of horizontal supports 822 which are horizontally arranged and vertically distributed at intervals, and the joints of the vertical supports 821 and the horizontal supports 822 can be connected in a way of mutually penetrating and welding; the v-shaped panel 81 comprises a web 811 and two side plates 812 respectively connected to the horizontal and longitudinal ends of the web 811, the web 811 abuts against a reinforcement cage of the underground frame foundation in the direction of the web 811, and horizontal reinforcements of the reinforcement cage are fixedly arranged through the web 811. The v-shaped joint 8 can bear a large vertical load and can effectively transfer a bending moment load, and the safety coefficient of the whole structure is improved.
Specifically, vertical supports 821 and horizontal supports 822 may be made of angle steel or channel steel; the horizontal supports 822 include a first stiffening rib 8221, two second stiffening ribs 8222, and two third stiffening ribs 8223; first stiffening ribs 8221 are disposed horizontally and longitudinally along the inner surface of web 811; the second stiffening ribs 8222 are respectively connected to the horizontal longitudinal two ends of the first stiffening ribs 8221 and horizontally and transversely arranged along the inner surface of the side plate 812 in the direction of the second stiffening ribs 8222; the third stiffening ribs 8223 are diagonally connected inside the first stiffening ribs 8221 and the second stiffening ribs 8222 for forming a support to ensure that the connector 8 is not deformed before the concrete 5 is poured. It will be appreciated that the structural strength can be further enhanced by adding stiffening ribs at reasonable stress points, such as adding a stiffening rib at the junction of the third stiffening rib 8223 and the second stiffening rib 8222 to increase the horizontal longitudinal load bearing capacity of the v-21274and the c-shaped joint 8.
Preferably, as shown in fig. 11, the vertical supports 821 are disposed in an orientation corresponding to the free ends of the second stiffening ribs 8222 and the connecting ends between the first stiffening ribs 8221, the second stiffening ribs 8222, and the third stiffening ribs 8223, so that the vertical supports 821 and the lateral supports are combined to form the high stability framework 82, which resists deformation caused by soil pressure.
Preferably, as shown in fig. 11, the connecting ends of the first stiffening rib 8221 and the third stiffening rib 8223 are located at one third and two thirds of the horizontal longitudinal direction of the first stiffening rib 8221, respectively, to serve to evenly distribute the horizontal transverse load; the connecting ends of the second stiffening ribs 8222 and the third stiffening ribs 8223 are located at half the second stiffening ribs 8222 to function as an even distribution of horizontal longitudinal loads.
Preferably, as shown in fig. 11, since the primary stress member of the v-21274; shaped joint 8 for receiving horizontal transverse loads resides in the second stiffening rib 8222, for further reinforcing the v-21274, the overall structural strength and load-bearing capacity of the shaped joint 8 is at two v-21274, the shaped joint 8 is connected at the free end of the second stiffening rib 8222 by a rigid connector 7, so that the two v-21274and the horizontal brace 822 of the shaped joint 8 interact to form a stable brace.
It is further preferable that, as shown in fig. 11, a grout stop device 83 is provided at the connection between the web 811 and the side plate 812, the grout stop device 83 comprises a first side wall 831 and a second side wall 832, the first side wall 831 is disposed parallel to the side plate 812 and extends towards the lower frame foundation of the site, and the second side wall 832 is disposed perpendicular to the side plate 812 and extends outwards, for preventing the grout in the trench section of the lower frame foundation, such as retaining wall grout, casting concrete 5 and the like, from penetrating into 21274and the shaped joint 8. Specifically, the first side wall 831 can be made of an iron sheet, has a certain supporting force, but also has a function of generating deformation after overload, and when concrete 5 is poured into the groove section of the underground frame foundation, the iron sheet can be pressed to be attached to the soil walls at the two horizontal and longitudinal ends, so that a certain grout stopping effect is achieved; the second side wall 832 can be made of existing equipment with enough structural strength such as angle steel or channel steel, and is tightly attached to or directly embedded into the soil walls at the two horizontal and longitudinal ends after the v-21274-shaped joint 8 is placed down, so that the purpose of stopping grout is achieved by matching with the first side wall 831. In addition, first sidewall 831 is the iron sheet, and when second sidewall 832 was angle steel or channel-section steel, can laminate first sidewall 831 and curb plate 812 surface to be connected second sidewall 832 pressfitting on first sidewall 831 with the curb plate 812 surface through the mode of bolt coupling, thereby make first sidewall 831 and second sidewall 832 fix at the curb plate 812 surface, conveniently and swiftly accomplish being connected of first sidewall 831 and second sidewall 832 and curb plate 812.
Further preferably, as shown in fig. 11, a plurality of shear ribs 84 are fixedly arranged on the web 811 in a penetrating manner, and after the shear ribs 84 penetrate through the web 811, the shear ribs are fixedly connected at the penetrating positions by welding and close the penetrating holes, so as to enhance the vertical shear resistance of the 21274and the v-shaped joint 8. Preferably, the shear ribs 84 are uniformly distributed on the web 811, symmetrically distributed in the horizontal longitudinal direction and equidistantly spaced in the vertical direction, so that the v-shaped joint 8 is uniformly stressed.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A construction method of an underground frame foundation connection structure is characterized by comprising the following steps:
s1, determining groove body side lines of a first construction section and a second construction section, prefabricating a first construction section reinforcement cage, a first construction section joint, a second construction section reinforcement cage and a second construction section joint, wherein the first construction section joint is connected with the end part of the first construction section reinforcement cage, and the second construction section joint is connected with the end part of the second construction section reinforcement cage;
s2, excavating a groove section of a first construction section according to a groove body side line, lowering a reinforcement cage of the first construction section and a joint of the first construction section, and pouring concrete to the groove section of the first construction section to form a first frame foundation;
s3, after the strength of concrete in the first construction section meets design requirements, excavating a groove section of the later construction section according to a groove body side line, lowering a joint of the later construction section and a reinforcement cage of the later construction section, enabling the joint of the later construction section and the joint of the first construction section to be oppositely placed to form a joint box, and then pouring concrete to the groove section of the later construction section to form a second frame foundation;
s4, after the strength of concrete in the later construction section meets the design requirement, connecting the first frame foundation and the second frame foundation in the joint box, and then pouring concrete into the joint box to complete construction;
the joint of the first construction section is connected with the end part of the reinforcement cage of the first construction section, and the joint of the first construction section is fixedly connected with the end part of the horizontal reinforcement of the reinforcement cage of the first construction section in a penetrating way; the rear construction section joint is connected with the end part of the rear construction section steel bar cage, and the end part of a horizontal steel bar of the rear construction section steel bar cage is fixedly connected with the rear construction section joint in a penetrating manner;
the connecting the first frame foundation and the second frame foundation includes: and welding, mechanically connecting or binding the joints of the first construction section and the joints of the second construction section, and/or welding, mechanically connecting or binding the horizontal steel bars of the reinforcement cage of the first construction section and the horizontal steel bars of the reinforcement cage of the second construction section.
2. The construction method of a connection structure of an underground frame foundation according to claim 1, wherein the pre-construction-stage groove section and the post-construction-stage groove section are grooved by chiseling and milling, and a mud dado is used in the grooving process.
3. The construction method of a connection structure of a foundation under ground according to claim 2, wherein the pouring of concrete into the pre-construction section groove section to form the first frame foundation includes: and pouring concrete into the area where the reinforcement cage of the previous construction section is located, and synchronously backfilling block stones into the joint of the previous construction section to form the support.
4. The construction method of a connection structure of an underground frame foundation according to claim 3, wherein the rock blocks backfilled in the joints of the previous construction sections are removed at the same time when the groove sections of the construction sections are excavated; the backward construction section groove section concreting to form a second frame foundation comprises: and pouring concrete to the area where the reinforcement cage is located at the rear construction section, and synchronously backfilling gravel into the joint box to form the support.
5. A construction method of a connection structure of an underground frame foundation according to claim 4, further comprising, before connecting the first frame foundation and the second frame foundation: the sand and stone in the joint box are sucked out through the vacuum mud sucking equipment.
6. The construction method of an underground frame foundation connection structure according to claim 5, further comprising, after sucking out sand in the joint box: the inside of the header tank is cleaned.
7. The construction method of a connection structure of an underground framework foundation as claimed in claim 1, wherein the connecting of the horizontal bars of the reinforcement cage of the previous construction section with the horizontal bars of the reinforcement cage of the subsequent construction section comprises: correspondingly connecting the horizontal steel bars of the reinforcement cage at the first construction section with the horizontal steel bars of the reinforcement cage at the later construction section through connecting steel bars; the first end of the connecting steel bar is mechanically connected with the end part of one horizontal steel bar, and the second end of the connecting steel bar is welded with the end part of the other horizontal steel bar.
8. A construction method of a connection structure of an underground frame foundation according to claim 7, wherein the connection of the connection bars to the horizontal bars at both ends thereof is sequentially alternated in a vertical direction.
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| JP3322701B2 (en) * | 1992-10-08 | 2002-09-09 | ケイコン株式会社 | Prefabricated piers and concrete blocks for piers |
| AUPR688701A0 (en) * | 2001-08-08 | 2001-08-30 | Tierney, Allen Richard | Modular post system and method of construction |
| CN101205717A (en) * | 2006-12-18 | 2008-06-25 | 上海华瀛建筑科技有限公司 | Ultra-deep underground continuous wall connector |
| CN110847156A (en) * | 2019-11-27 | 2020-02-28 | 中铁九局集团第四工程有限公司 | Steel reinforcement cage suitable for underground diaphragm wall of air shaft and use method |
| CN112144509A (en) * | 2020-09-27 | 2020-12-29 | 中国建筑第八工程局有限公司 | Construction method of underground continuous wall, joint and connection structure thereof |
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Inventor after: Huang Hongya Inventor after: Zhou Mi Inventor after: Yuan Wen Inventor after: Jin Xiaoqiang Inventor after: Dai Zhen Inventor after: Liao Shengru Inventor after: Liu Zhen Inventor after: Guo Lin Inventor after: Li Song Inventor after: Chen Yi Inventor after: Liu Qiqi Inventor after: Bai Xingwei Inventor after: Fan Junjie Inventor after: Diao Xigang Inventor after: Li Chao Inventor after: Luo Mingyong Inventor after: Zhang Wei Inventor after: Li Qiang Inventor after: Gong Xia Inventor after: Zeng Yongtai Inventor before: Li Chao Inventor before: Zhou Mi Inventor before: Yuan Wen Inventor before: Jin Xiaoqiang Inventor before: Dai Zhen Inventor before: Liao Shengru Inventor before: Liu Zhen Inventor before: Guo Lin Inventor before: Li Song Inventor before: Chen Yi Inventor before: Liu Qiqi Inventor before: Bai Xingwei Inventor before: Fan Junjie Inventor before: Diao Xigang Inventor before: Huang Hongya Inventor before: Luo Mingyong Inventor before: Zhang Wei Inventor before: Li Qiang Inventor before: Gong Xia Inventor before: Zeng Yongtai |
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