CN112681334A - Deep foundation pit side wall concrete pouring construction structure and method - Google Patents
Deep foundation pit side wall concrete pouring construction structure and method Download PDFInfo
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- CN112681334A CN112681334A CN202011490607.4A CN202011490607A CN112681334A CN 112681334 A CN112681334 A CN 112681334A CN 202011490607 A CN202011490607 A CN 202011490607A CN 112681334 A CN112681334 A CN 112681334A
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Abstract
The invention discloses a deep foundation pit side wall concrete pouring construction structure and a method, wherein the structure comprises a foundation pit support structure, a waist beam, a concrete hopper, a pouring guide pipe and a side wall template; the side wall template is arranged between two vertically adjacent waist beams, and the side wall template, the foundation pit support structure and the waist beams surround to form a side wall pouring cavity; the waist beam is provided with a plurality of pouring holes communicated with the side wall pouring cavity; the pouring guide pipe is arranged in the pouring hole, and the lower end of the pouring guide pipe is positioned in the side wall pouring cavity; the upper end of the pouring guide pipe is communicated with a concrete hopper arranged at the upper end of the waist beam. The invention has the beneficial effects that: the pouring guide pipe reduces the pouring height of the poured concrete, avoids the quality risk of segregation of the concrete due to the fact that the pouring height exceeds the standard, and improves pouring quality. Through set up the concrete hopper in pouring the pipe upper end, the overhead pump truck distributing pipe need not to pull out and inserts the operation, has reduced the safety risk.
Description
Technical Field
The invention relates to the technical field of buildings, in particular to a deep foundation pit side wall concrete pouring construction structure and a method.
Background
With the development of urban construction and the increase of population density, the development and utilization of underground space are more and more emphasized, various types of underground engineering and large-scale deep foundation pit engineering are increasingly increased, and an efficient and economic deep foundation pit construction method is particularly important. When the deep foundation pit is constructed, firstly, building enclosures such as diaphragm walls and the like are constructed, then, excavating layer by layer, arranging waist beams and foundation pit supports, constructing a main structure bottom plate after excavating to a designed elevation, and finally, upwards constructing the main structure side walls layer by layer. Wherein the side wall of the main structure of the foundation pit is positioned between the upper layer of waist beam and the lower layer of waist beam. After the binding of the steel bars of the side wall of the main structure and the installation of the template are finished, the empty face is completely closed, no pouring channel is provided, and concrete cannot be directly poured. Therefore, an engineer usually reserves a vertically through pouring hole and a vibrating hole in a waist rail at the top of the side wall, and when concrete is poured, a material distribution pipe of the overhead pump truck directly extends into a foundation pit from the ground and then is inserted into the pouring hole, so that the problem of pouring a channel is solved. However, this casting method has two problems:
(1) security risk: in order to ensure the pouring quality of the side wall concrete, a plurality of pouring holes are reserved on the waist beam, pouring points need to be transferred for many times during pouring, and the operation of inserting and pulling out the pouring holes of the distributing pipe of the overhead pump truck is difficult, and huge safety risks exist;
(2) quality risk: the side wall internal stirrups, horizontal steel bars and the like are dense, and after the distributing pipe is inserted into the waist rail pouring hole, the distributing pipe cannot be inserted deeper, so that the pouring concrete has the same height as the side wall to be poured, the requirement of the highest pouring height in the national standard is often exceeded, and the quality risk of concrete segregation exists. The relevant current national standards are as follows:
section 6.6.8 of "concrete quality control Standard" (GB 50164-2011) specifies: when the free falling height of the concrete is more than 3 m, auxiliary equipment such as a string drum, a chute pipe or a vibration chute pipe is preferably adopted.
Section 8.3.6 of concrete structure engineering construction Specification (GB 50666-2011) specifies: pouring concrete in the column and wall templates, wherein the pouring height is not more than 3 m when the particle size of the coarse aggregate is more than 25 mm, and the pouring height is not more than 6m when the particle size of the coarse aggregate is less than 25 mm.
In addition in conventional construction, among the deep basal pit major structure side wall reinforcement in-process, the pre-buried operation of its vertical main muscle in the waist rail relies on manual location, the location effect relies on operation personnel responsibility and operation level, the interval often takes place, the big scheduling problem of straightness deviation of hanging down, when causing vertical main muscle to plug into the installation between the waist rail, the upper portion ware axis slope of plugging into, the inconsistent scheduling problem of interval, the interlude main muscle need rectify the reinforcing bar position repeatedly when connecting from top to bottom, need plant the muscle again on the waist rail when serious even, cause the problem of inefficiency, construction quality is poor.
Disclosure of Invention
The invention aims to solve the problems of high safety risk and quality risk and low construction efficiency in the side wall pouring construction of the existing deep foundation pit main structure, and provides a concrete pouring construction structure for the side wall of the deep foundation pit, which comprises a foundation pit support structure and a plurality of waist beams arranged at the same side of the foundation pit support structure at intervals; the concrete pouring device also comprises a concrete hopper, a pouring guide pipe and a side wall template; the side wall template is arranged between two vertically adjacent waist beams, and the side wall template, the foundation pit support structure and the waist beams surround to form a side wall pouring cavity; a plurality of pouring holes communicated with the side wall pouring cavity are formed in the waist beam; the pouring guide pipe is arranged in the pouring hole, and the lower end of the pouring guide pipe is positioned in the side wall pouring cavity; the upper end of the pouring guide pipe is communicated with the concrete hopper arranged at the upper end of the waist beam.
Furthermore, the central axes of the pouring holes in the two vertically adjacent waist beams are arranged in a staggered mode. The staggered pouring holes can improve the pouring quality of the side wall.
Further, a plurality of embedded hanging rings are arranged at the lower end of the waist beam; the embedded hanging rings are located in the side wall pouring cavity. The embedded lifting rings can be used as hoisting fixing pieces of the pouring guide pipe and embedded joint bars of the waist beam, and the connection reliability of the waist beam and the side wall is improved. In addition, the embedded lifting rings positioned at the upper end of each side wall pouring cavity are vertically aligned with the pouring holes at the lower end of the side wall pouring cavity.
Further, the construction structure also comprises a side wall vertical main rib positioning structure; the side wall vertical main rib positioning structure comprises a side wall vertical main rib, a steel bar connector and a limiting plate; the side wall vertical main ribs comprise side wall end vertical main ribs and side wall middle vertical main ribs which are coaxial and connected through the reinforcing steel bar connector; the vertical main reinforcement at the end part of the side wall vertically penetrates through the waist rail; the vertical main rib in the middle of the side wall is arranged in the side wall pouring cavity; the limiting plate is arranged at the lower end of the waist beam; the limiting plate is provided with a plurality of positioning holes at intervals along the length direction of the waist rail; one end of the side wall vertical main rib or one end of the reinforcing steel bar connector is inserted into the positioning hole. The waist beam is provided with the limiting plate, and the limiting plate is provided with the positioning hole matched with the side wall vertical main rib or the steel bar connector, so that the side wall vertical main rib is quickly positioned and connected; the accurate connection of the vertical main rib at the end part of the side wall and the vertical main rib in the middle part of the side wall can be ensured, the problems of time waste, low quality and the like caused by repeated correction of the position are avoided, the construction period is shortened, and the construction cost is saved.
Furthermore, a limiting ring with the outer diameter larger than that of the pouring hole is arranged at the upper end of the pouring guide pipe, the limiting ring is arranged at the upper end of the waist beam, and guide pipe hanging rings are symmetrically arranged on the limiting ring; the guide pipe hanging ring is connected with the embedded hanging ring through a chain block. The limiting and fixing of the pouring guide pipe are realized through the limiting ring, and the pouring guide pipe is prevented from falling into a pouring cavity of the side wall below the pouring guide pipe; through the cooperation of pipe rings and pre-buried rings, can realize pouring the installation of pipe and stretch into the regulation of degree of depth.
Furthermore, the lower end of the concrete hopper is also provided with a hopper supporting leg; the hopper supporting leg is erected at the upper end of the waist beam; and the inlet area part of the concrete hopper extends out of one side of the waist beam back to the foundation pit support structure. Concrete hopper entry area stretches out beyond the waist rail, and the overhead pump truck distributing pipe of being convenient for puts into, reduces the safety risk, improves the convenience of arranging of distributing pipe.
Furthermore, the pouring guide pipe is positioned at the upper end of the limiting ring and is provided with a guide pipe joint communicated with the lower end of the concrete hopper. The detachable connection of the pouring guide pipe and the concrete hopper is realized through the guide pipe joint, and the turnover use is convenient.
Furthermore, one end of the side wall template, which is back to the side wall pouring cavity, is provided with a plurality of vertical rib plates and transverse rib plates which are arranged in a staggered mode.
The concrete pouring construction structure for the side wall of the deep foundation pit has the beneficial effects that: through predetermineeing the hole of pouring on the waist rail and set up the pipe of pouring that can stretch into the side wall and pour the intracavity on pouring the hole, reduced the height that falls of pouring the concrete, avoided the concrete because of the quality risk that the height that falls of inclining exceeds standard and educe, improved and pour the quality. Through setting up the concrete hopper in pouring the pipe upper end, the overhead pump truck distributing pipe of being convenient for places, pours the in-process, and overhead pump truck distributing pipe need not to pull out and insert the operation, need not to insert and pour downtheholely, and the operation is convenient, has reduced the safety risk.
The invention also provides a concrete pouring construction method for the side wall of the deep foundation pit, which comprises the following steps:
step one, paving a waist rail steel bar at a position where a waist rail is to be poured, embedding a limiting plate with a positioning hole and embedding a pipeline for forming a pouring hole which is communicated up and down; the limiting plate is provided with a vertical main reinforcement at the end part of the side wall and a steel bar connector; carrying out waist beam pouring construction layer by layer from top to bottom;
step two, installing a side wall middle vertical main rib connected with the side wall end vertical main rib between the vertically adjacent waist beams through the steel bar connector;
thirdly, paving a side wall template between the vertically adjacent waist beams, and enclosing the side wall template, the foundation pit support structure and the waist beams to form a side wall pouring cavity; inserting a pouring guide pipe of which the upper end is communicated with a concrete hopper into the pouring hole corresponding to the side wall pouring cavity, and enabling the lower end of the pouring guide pipe to be positioned in the side wall pouring cavity and to freely move in the vertical direction; aligning a material distribution pipe of the overhead pump truck to the concrete hopper to carry out side wall pouring operation until the pouring of the side wall pouring cavity of the side wall is finished;
and step four, repeating the step three, and performing pouring construction of the side wall pouring cavities layer by layer from bottom to top until all the side wall pouring cavities are poured, so as to finish concrete pouring construction of the side wall of the main body structure.
Further, before the wale steel bars are laid at the position where the wale is to be poured in the step one, the wale pouring pretreatment is further included: after the construction of the deep foundation pit support structure is finished, earth excavation operation is started, after the excavation is carried out to the construction elevation of the waist beam, the end part of a pre-embedded steel bar of the foundation pit support structure is excavated, a steel bar planting measure is adopted at the part of the foundation pit support structure where the steel bar is not pre-embedded, the contact surface of the foundation pit support structure and the waist beam is roughened, and the working surface is cleaned and leveled; laying a waist rail bottom die and a waist rail side die, and brushing a release agent.
Further, after the pouring of the side wall pouring cavity in the third step is finished, pulling out the pouring guide pipe from the pouring hole through a chain block; the first step further comprises the step of arranging an embedded hanging ring at the position where the waist rail is to be poured, and the chain block is connected with the embedded hanging ring.
The construction method for pouring the concrete on the side wall of the deep foundation pit has the beneficial effects that: the waist beam is provided with the limiting plate, and the limiting plate is provided with the positioning hole matched with the side wall vertical main rib or the steel bar connector, so that the side wall vertical main rib is quickly positioned and connected; the accurate connection of the vertical main rib at the end part of the side wall and the vertical main rib in the middle part of the side wall can be ensured, the problems of time waste, low quality and the like caused by repeated correction of the position are avoided, the construction period is shortened, and the construction cost is saved. Through predetermineeing the hole of pouring on the waist rail and set up the pipe of pouring that can stretch into the side wall and pour the intracavity on pouring the hole, reduced the height that falls of pouring the concrete, avoided the concrete because of the quality risk that the height that falls of inclining exceeds standard and educe, improved and pour the quality. Through setting up the concrete hopper in pouring the pipe upper end, the overhead pump truck distributing pipe of being convenient for places, pours the in-process, and overhead pump truck distributing pipe need not to pull out and insert the operation, need not to insert and pour downtheholely, and the operation is convenient, has reduced the safety risk.
Drawings
FIG. 1 is a schematic sectional structure view of the concrete pouring construction structure for the side wall of the deep foundation pit.
Fig. 2 is an enlarged schematic view of a portion a of fig. 1.
Fig. 3 is an enlarged sectional view along the direction B-B in fig. 1.
Fig. 4 is a schematic diagram of a distribution structure of vertical main ribs of an inner wall of a certain side wall in fig. 1 after pouring of the side wall is completed.
Fig. 5 is an enlarged sectional view of the structure of fig. 4 taken along line a-a.
In the figure: 1-a foundation pit enclosure structure; 2-waist rail; 3, embedding a hanging ring; 4, supporting a foundation pit; 5-an overhead pump truck distributing pipe; 6-concrete hopper; 6.1-hopper legs; 7-pouring a guide pipe; 7.1-conduit hoisting ring; 8-side wall concrete in pouring; 9-side wall template; 10-vertical rib plates; 11-a cross rib plate; 12-pouring side wall concrete; 13-foundation pit bottom plate; 14-a stop collar; 15-vertical main ribs in the middle of the side walls; 16-a steel bar connector; 17-a limiting plate; 18-vertical main ribs at the end parts of the side walls; 19-side wall pouring cavity; and 20-pouring holes.
Detailed Description
The invention is described in further detail below with reference to the figures and specific embodiments.
The deep foundation pit side wall concrete pouring construction structure shown in fig. 1, 2 and 3 comprises a foundation pit support structure 1, a plurality of waist beams 2 arranged at intervals on the same side of the foundation pit support structure 1 and a foundation pit support 4 arranged on one side of the waist beams 2 opposite to the foundation pit support structure 1; the construction structure further comprises a concrete hopper 6, a pouring guide pipe 7 and a side wall template 9.
The side wall template 9 is arranged between two vertical adjacent waist beams 2, and the side wall template 9, the foundation pit support structure 1 and the waist beams 2 surround to form a side wall pouring cavity 19; and a plurality of vertical rib plates 10 and transverse rib plates 11 which are arranged in a staggered mode are arranged at one end, back to the side wall pouring cavity 19, of the side wall template 9.
A plurality of pouring holes 20 communicated with the side wall pouring cavities 19 are formed in the waist beam 2; the pouring guide pipe 7 is arranged in the pouring hole 20, and the lower end of the pouring guide pipe 7 is positioned in the side wall pouring cavity 19; the upper end of the pouring guide pipe 7 is communicated with a concrete hopper 6 arranged at the upper end of the waist beam 2. The inner diameter of the pouring hole 20 in the embodiment is between 20 and 40 cm.
In order to guarantee the quality of the main structure, the central axes of the pouring holes 20 in the two vertically adjacent wales 2 are staggered. The lower end of the waist beam 2 is provided with a plurality of embedded hanging rings 3; the embedded hoisting ring 3 is positioned in the side wall pouring cavity 19; the embedded rings 3 on the two vertically adjacent waist beams 2 are superposed with the central axis of the pouring hole 20 corresponding to the lower end of the side wall pouring cavity 19, namely, the embedded rings 3 positioned at the upper end of each side wall pouring cavity 19 are vertically aligned with the pouring hole 20 at the lower end of the side wall pouring cavity 19. Referring to fig. 2, in two adjacent wales 2, the lower end of the upper-layer wale 2 is provided with an embedded hanging ring 3, and the lower end of the embedded hanging ring 3 extends to a position below the lower end of the wale 2; and a pouring hole 20 vertically aligned with the embedded hanging ring 3 is formed in the waist beam 2 below the waist beam 2. The pouring hole 20 and the embedded hanging ring 3 are preset during construction of the waist rail 2.
In addition, referring to fig. 4 and 5, the construction structure in the embodiment further includes a side wall vertical main reinforcement positioning structure; the side wall vertical main reinforcement positioning structure comprises side wall vertical main reinforcements, a reinforcement connector 16 and a limiting plate 17; the side wall vertical main ribs comprise side wall end vertical main ribs 18 and side wall middle vertical main ribs 15 which are coaxial and connected through a reinforcing steel bar connector 16; the vertical main reinforcement 18 at the end part of the side wall vertically penetrates through the waist rail; the side wall middle vertical main reinforcement 15 is arranged in the side wall pouring cavity 19; the limiting plate 17 is arranged at the lower end of the waist rail; the limiting plate 17 is provided with a plurality of positioning holes at intervals along the length direction of the waist rail; one end of the vertical main reinforcement of the side wall or one end of the reinforcing steel bar connector 16 is inserted into the positioning hole.
The method specifically comprises the following steps: both ends of the vertical main rib 18 at the end part of the side wall and both ends of the vertical main rib 15 in the middle part of the side wall are provided with thread sections; the reinforcing steel bar connector 16 is a threaded sleeve matched with the thread section in a threaded manner; the vertical main reinforcement 18 at the end part of the side wall vertically penetrates through the waist rail 2; the side wall middle vertical main reinforcement 15 is arranged between the waist beams 2 of the vertical adjacent layers, during connection, the lower end of the side wall end vertical main reinforcement 18 on the upper layer waist beam 2 is connected with the upper end of the side wall middle vertical main reinforcement 15 at the lower end through a reinforcement connector 16, and the upper end of the side wall end vertical main reinforcement 18 on the lower layer waist beam 2 is connected with the lower end of the side wall middle vertical main reinforcement 15 at the upper end through another reinforcement connector 16.
The limiting plate 17 is arranged at the lower end of the waist rail 2; the limiting plate 17 is provided with a plurality of positioning holes at intervals along the length direction of the waist rail 2; one end of the vertical main reinforcement of the side wall or one end of the reinforcing steel bar connector 16 is inserted into the positioning hole.
In this embodiment, the reinforcing bar connector 16 and the limiting plate 17 are preferably embedded in the lower end of the cross beam, and the lower end of the reinforcing bar connector 16, the lower end of the limiting plate 17 and the lower end of the cross beam are all in the same horizontal plane. The upper end of the vertical main rib 18 at the end part of the side wall is higher than the upper end of the wale 2 connected with the vertical main rib. When the wale is poured and constructed, the limiting plate 17 can be poured and fixed at the lower end of the wale.
The limiting plate 17 is preferably a strip-shaped plate, and a plurality of positioning holes are distributed along the length direction of the limiting plate 17. There may be a plurality of strip plates on each wale 2, that is, there may be a plurality of limiting plates 17 on each wale 2, and in this embodiment, the number of limiting plates 17 on each wale 2 is preferably two and maintains a lateral spacing.
The construction method for pouring the concrete on the side wall of the deep foundation pit comprises the following steps: firstly, after the construction of the deep foundation pit support structure 1 is finished, earth excavation operation is started, and the construction of the waist beam 2 is carried out layer by layer from top to bottom; when the wale 2 is constructed, a pouring hole 20 and a vertical main rib 18 at the end part of a side wall are preset in the wale 2; and after the waist beam 2 is constructed, the main structure bottom plate is constructed, and the side wall pouring construction is carried out layer by layer upwards. Specifically, the method comprises the following steps:
the method comprises the steps of firstly, after the construction of the deep foundation pit support structure 1 is finished, earth excavation operation is started, after the excavation is carried out to the construction elevation of the waist beam 2, the end part of a pre-embedded steel bar of the foundation pit support structure 1 is chiseled out, a steel bar planting measure is adopted for the part, not pre-embedded steel bar, of the foundation pit support structure 1, the contact surface, in contact with the waist beam 2, of the foundation pit support structure 1 is chiseled, and the working surface is cleaned and.
Secondly, paving a bottom die and a side die of the waist beam 2, painting a release agent, and pouring the waist beam 2; before pouring the waist beam 2, paving the waist beam 2 steel bars at the position of the waist beam 2 to be poured and embedding pipelines to form a pouring hole 20 which is communicated up and down, staggering the central axes of the embedded pipelines on the vertically adjacent waist beams 2, installing embedded hanging rings and limiting plates on bottom moulds of the waist beams 2, and installing vertical main ribs 18 at the end parts of side walls and steel bar connectors on the limiting plates; wherein, the vertical main reinforcement 18 of the end part of the side wall is bound and fixed with the reinforcing steel bar of the wale 2.
And step three, repeating the step one and the step two, completing the construction of the multi-layer waist beam 2 until the bottom elevation of the foundation pit bottom plate cushion layer is excavated, and completing the construction of the main structure bottom plate.
And fourthly, installing the side wall middle vertical main reinforcement 15 connected with the side wall end vertical main reinforcement 18 between the vertically adjacent wales 2 through a reinforcement connector, and completing construction of other reinforcements of the side wall, such as stirrups or other transverse supports or construction of connecting reinforcements.
Fifthly, paving a side wall template between the vertically adjacent waist beams 2, and enclosing the side wall template, the foundation pit support structure and the waist beams 2 to form a side wall pouring cavity 19; inserting a pouring guide pipe 7 with the upper end communicated with a concrete hopper into a corresponding pouring hole 20 of a side wall pouring cavity 19, enabling the lower end of the pouring guide pipe 7 to be located in the side wall pouring cavity 19 and to freely move in the vertical direction, and enabling the pouring guide pipe 7 to vertically adjust the height in the pouring process; aligning a material distribution pipe of the overhead pump truck to a concrete hopper to carry out side wall pouring operation, and pulling out the pouring guide pipe 7 from the pouring hole 20 through a chain block after pouring of a region corresponding to the side wall pouring cavity 19 corresponding to the pouring hole 20 is finished, wherein the chain block is connected with the embedded hanging ring; referring to fig. 3, a plurality of pouring holes 20 are formed in the wale 2 corresponding to the same side wall pouring cavity 19, the pouring guide pipe 7 is pulled out from the pouring hole 20 and transferred to another pouring hole 20 corresponding to the same side wall pouring cavity 19, and the pouring operation is continued until the side wall pouring cavity 19 is completely poured.
And step six, repeating the step five, and performing pouring construction of the side wall pouring cavities 19 layer by layer from bottom to top until all the side wall pouring cavities 19 are poured, so as to finish the side wall concrete pouring construction of the main body structure. It should be noted that, in the fifth step, the side wall formworks are laid between the vertically adjacent waist beams 2, preferably, the side wall formworks are laid between the vertically adjacent waist beams 2 at the lowest layer, that is, the pouring construction of the side wall pouring cavity 19 at the lowest layer is firstly performed, after the construction of the side wall pouring cavity 19 at the lowest layer is completed, the side wall formworks are laid upwards layer by layer, and after each layer of side wall formwork is laid, the corresponding pouring construction of the side wall pouring cavity 19 at the layer is performed, and then the laying construction of the side wall formworks at the previous layer is performed until all the side wall pouring cavities 19 are completely poured.
Further concretely: the height difference between the lower end of the pouring guide pipe 7 and the bottom of the side wall pouring cavity 19 where the lower end is located is less than or equal to 6 m. Preferably, the height difference between the lower end of the pouring guide pipe 7 and the bottom of the side wall pouring cavity 19 where the lower end is located is less than or equal to 3 m, and the specific height difference depends on the construction specification. In fact, at least one section of corrugated pipe with adjustable length can be arranged at the position of the pouring guide pipe 7 above the waist beam 2, and the position of the pouring guide pipe 7 below the corrugated pipe is movably connected with the pouring hole 20, so that the height of the lower end of the pouring guide pipe 7 can be adjusted, and the falling height of the concrete can be adjusted.
A limiting ring 14 with the outer diameter larger than that of the pouring hole 20 is arranged at the upper end of the pouring guide pipe 7, the limiting ring 14 is arranged at the upper end of the waist rail 2, and guide pipe lifting rings 7.1 are symmetrically arranged on the limiting ring 14; the conduit hoisting ring 7.1 is connected with the embedded hoisting ring 3 through a chain block. The upper end of the pouring guide pipe 7 positioned on the limiting ring 14 is provided with a guide pipe joint communicated with the lower end of the concrete hopper 6. The mode of connection of pipe rings 7.1 and pre-buried rings 3 also can be replaced with other structures, connects pipe hanger pipe and pre-buried rings 3 through chain block in this embodiment, realizes lifting by crane and transferring of pouring pipe 7, not only is convenient for pour the installation of pipe 7, also is convenient for pour the altitude mixture control of pipe 7.
Referring to fig. 2, the lower end of the concrete hopper 6 is also provided with hopper supporting legs 6.1; the hopper supporting legs 6.1 are erected at the upper end of the waist beam 2; the inlet area of the concrete hopper 6 extends out of one side of the waist beam 2 back to the foundation pit support structure 1, and a valve can be arranged at the position where the lower end of the concrete hopper 6 is communicated with the pouring guide pipe 7 and used for controlling the amount of concrete entering the pouring guide pipe 7. During construction, the lower end of the material distribution pipe 5 of the overhead pump truck is directly arranged in an entrance area of the concrete hopper 6, the part of the entrance area extends out of one side of the waist beam 2 back to the foundation pit support structure 1, the distance between the lower end of the material distribution pipe 5 and the upper end of the concrete hopper 6 is less than or equal to one meter, the material distribution pipe 5 of the overhead pump truck is not required to be inserted into the pouring hole 20, the operation space is relatively large, and the safety risk is reduced.
The upper end of the concrete hopper 6 can also be symmetrically provided with hopper hoisting rings for hoisting the concrete hopper 6 by matching with the embedded hoisting rings 3 and the chain block; for example, when concrete is about to be poured in the side wall pouring cavity 19, the pouring guide pipe 7 needs to be pulled out and concrete continues to be poured, and the concrete hopper 6 is arranged at the upper end of the pouring guide pipe 7, so that the concrete hopper 6 and the pouring guide pipe 7 can be directly and synchronously lifted, and the lower end of the distribution pipe 5 of the overhead pump truck is still positioned in the concrete hopper 6 until the lower end of the pouring guide pipe 7 is completely pulled out of the pouring hole 20.
The pouring guide pipe 7 can be made of a PVC pipe or an iron pipe; the reinforced concrete pipe body can also be adopted, and when the reinforced concrete pipe body is adopted, the reinforced concrete pipe body needs to be prefabricated in advance, and the upper end or the lower end of the pipe body is reserved with a protruding reinforcing steel bar. When the pouring guide pipe 7 is a reinforced concrete pipe body, the pouring pipe body is not required to be taken out after the pouring of the side wall pouring cavity 19 is completed, the pouring guide pipe 7 is embedded in the side wall pouring cavity 19, and then the interior of the reinforced concrete pipe body is filled and poured. The side wall of the reinforced concrete pipe body is provided with communicating holes for communicating the inside and the outside, preferably, the outer wall and the inner wall of the reinforced concrete pipe body are provided with convex reinforcing steel bars and chiseling surfaces.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (10)
1. A concrete pouring construction structure for a side wall of a deep foundation pit comprises a foundation pit support structure and a plurality of waist beams which are arranged on the same side of the foundation pit support structure at intervals; the method is characterized in that: the concrete pouring device also comprises a concrete hopper, a pouring guide pipe and a side wall template; the side wall template is arranged between two vertically adjacent waist beams, and the side wall template, the foundation pit support structure and the waist beams surround to form a side wall pouring cavity; a plurality of pouring holes communicated with the side wall pouring cavity are formed in the waist beam; the pouring guide pipe is arranged in the pouring hole, and the lower end of the pouring guide pipe is positioned in the side wall pouring cavity; the upper end of the pouring guide pipe is communicated with the concrete hopper arranged at the upper end of the waist beam.
2. The deep foundation pit side wall concrete pouring construction structure of claim 1, characterized in that: the central axes of the pouring holes in the two vertically adjacent waist beams are staggered.
3. The deep foundation pit side wall concrete pouring construction structure of claim 2, characterized in that: the lower end of the waist beam is provided with a plurality of embedded hanging rings; the embedded hanging rings are located in the side wall pouring cavity.
4. The deep foundation pit side wall concrete pouring construction structure of claim 1, characterized in that: the construction structure also comprises a side wall vertical main rib positioning structure; the side wall vertical main rib positioning structure comprises a side wall vertical main rib, a steel bar connector and a limiting plate; the side wall vertical main ribs comprise side wall end vertical main ribs and side wall middle vertical main ribs which are coaxial and connected through the reinforcing steel bar connector; the vertical main reinforcement at the end part of the side wall vertically penetrates through the waist rail; the vertical main rib in the middle of the side wall is arranged in the side wall pouring cavity; the limiting plate is arranged at the lower end of the waist beam; the limiting plate is provided with a plurality of positioning holes at intervals along the length direction of the waist rail; one end of the side wall vertical main rib or one end of the reinforcing steel bar connector is inserted into the positioning hole.
5. The deep foundation pit side wall concrete pouring construction structure of claim 3, characterized in that: a limiting ring with the outer diameter larger than that of the pouring hole is arranged at the upper end of the pouring guide pipe, the limiting ring is arranged at the upper end of the waist beam, and guide pipe hanging rings are symmetrically arranged on the limiting ring; the guide pipe hanging ring is connected with the embedded hanging ring through a chain block.
6. The deep foundation pit side wall concrete pouring construction structure of claim 5, characterized in that: and the pouring guide pipe is positioned at the upper end of the limiting ring and is provided with a guide pipe joint communicated with the lower end of the concrete hopper.
7. The deep foundation pit side wall concrete pouring construction structure of claim 1, characterized in that: and one end of the side wall template, which is back to the side wall pouring cavity, is provided with a plurality of vertical rib plates and transverse rib plates which are arranged in a staggered mode.
8. A deep foundation pit side wall concrete pouring construction method is characterized by comprising the following steps: the method comprises the following steps:
step one, paving a waist rail steel bar at a position where a waist rail is to be poured, embedding a limiting plate with a positioning hole and embedding a pipeline for forming a pouring hole which is communicated up and down; the limiting plate is provided with a vertical main reinforcement at the end part of the side wall and a steel bar connector; carrying out waist beam pouring construction layer by layer from top to bottom;
step two, installing a side wall middle vertical main rib connected with the side wall end vertical main rib between the vertically adjacent waist beams through the steel bar connector;
thirdly, paving a side wall template between the vertically adjacent waist beams, and enclosing the side wall template, the foundation pit support structure and the waist beams to form a side wall pouring cavity; inserting a pouring guide pipe of which the upper end is communicated with a concrete hopper into the pouring hole corresponding to the side wall pouring cavity, and enabling the lower end of the pouring guide pipe to be positioned in the side wall pouring cavity and to freely move in the vertical direction; aligning a material distribution pipe of the overhead pump truck to the concrete hopper to carry out side wall pouring operation until the pouring of the side wall pouring cavity of the side wall is finished;
and step four, repeating the step three, and performing pouring construction of the side wall pouring cavities layer by layer from bottom to top until all the side wall pouring cavities are poured, so as to finish concrete pouring construction of the side wall of the main body structure.
9. The deep foundation pit side wall concrete pouring construction method according to claim 8, characterized in that: before the wale steel bars are laid at the position where the wale is to be poured in the step one, the wale pouring pretreatment is further included: after the construction of the deep foundation pit support structure is finished, earth excavation operation is started, after the excavation is carried out to the construction elevation of the waist beam, the end part of a pre-embedded steel bar of the foundation pit support structure is excavated, a steel bar planting measure is adopted at the part of the foundation pit support structure where the steel bar is not pre-embedded, the contact surface of the foundation pit support structure and the waist beam is roughened, and the working surface is cleaned and leveled; laying a waist rail bottom die and a waist rail side die, and brushing a release agent.
10. The deep foundation pit side wall concrete pouring construction method according to claim 9, characterized in that: after the pouring of the side wall pouring cavity in the step three is finished, pulling the pouring guide pipe out of the pouring hole through a chain block; the first step further comprises the step of arranging an embedded hanging ring at the position where the waist rail is to be poured, and the chain block is connected with the embedded hanging ring.
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