CN112982428A - Assembled multilayer internal support structure and rapid construction method thereof - Google Patents

Abstract

The invention discloses an assembled multilayer internal support structure and a rapid construction method thereof, wherein the assembled multilayer internal support structure comprises a fender post, a stand column pile and a plurality of layers of support parts which are respectively arranged along the height direction of the fender post and the stand column pile at intervals, a crown beam is embedded at the top end of the fender post, and the inner side of the crown beam is detachably connected with a cross beam which is correspondingly lapped on the support part at the top layer; waist beams are lapped on the top ends of the supporting parts at different heights of the fender post, and the inner side of each layer of waist beam is detachably connected with the corresponding cross beam lapped on the layer of supporting part. The prefabricated crown beam, waist beam and cross beam are used as the inner supporting structure of the foundation pit, so that the construction period can be greatly shortened, the working efficiency is improved, and the method has remarkable economic and technical benefits.

Description

Assembled multilayer internal support structure and rapid construction method thereof

Technical Field

The invention relates to the field of foundation pit excavation and underground structural engineering, in particular to an assembled multilayer inner support structure and a rapid construction method thereof.

Background

In order to solve the ecological environment problem caused by accumulated water and polluted rainwater, the regulation and storage tanks are built in each big city in succession, and the technical measure has good effects of controlling non-point source pollution, improving the water environment around the city and the like and has strong operability. In order to meet the requirements of increasing rain sewage runoff and structural function diversification, the depth of the storage regulation pool is increased from a few meters to dozens of meters, the area is increased from hundreds of square meters to tens of thousands of square meters, and the continuous expansion of the scale of underground single structures provides higher requirements for foundation pit excavation and supporting.

During the construction of conventional foundation pit engineering, the inner support construction and the earthwork excavation process are fully combined according to the principles of 'supporting a groove, firstly supporting and then excavating, excavating in layers and strictly prohibiting over excavation'. When the designed elevation is excavated, the site is leveled, a bottom template is supported, reinforcing steel bars are bound, side molds are installed, concrete is poured, and then concrete vibrating and curing are carried out. And carrying out the next procedure when the strength of the concrete reaches the designed strength. This construction process requires a large number of forms, consuming a lot of time and labor. In addition, the inner support is usually broken manually, blasted or mechanically cut when being dismantled, so that the time and labor are wasted, the environment is not protected, the construction progress is slow, and the construction cost is high.

Based on the situation, the invention provides an assembly type multilayer internal support structure and a rapid construction method thereof, which can effectively solve the problems.

Disclosure of Invention

Aiming at the problems, the invention provides an assembled multilayer internal support structure and a rapid construction method thereof, which can greatly shorten the construction period of an underground single structure and improve the construction quality.

In order to solve the technical problems, the invention is realized by the following technical scheme:

the invention provides an assembled multilayer internal support structure, which comprises fender posts, upright posts and multilayer support parts arranged at intervals along the height direction of the fender posts and the upright posts respectively, wherein crown beams are embedded at the top ends of the fender posts, and the inner sides of the crown beams are detachably connected with cross beams correspondingly lapped on the top layer support parts; waist beams are lapped on the top ends of the supporting parts at different heights of the fender post, and the inner side of each layer of waist beam is detachably connected with the corresponding cross beam lapped on the layer of supporting part.

Preferably, the crown beam is composed of a plurality of crown beam units which are connected end to end and are arranged in a full-length mode, and two ends of each crown beam unit are respectively provided with a first bulge and a first groove which are matched with the adjacent crown beam units.

It is further preferred that the first protrusion and the first groove are both rectangular structures.

Preferably, a first reinforcing steel bar with a certain length is preset on the inner side of each crown beam unit, and a first reinforcing steel bar insertion hole matched with the first reinforcing steel bar is correspondingly formed in one end part of the top layer supporting part.

Preferably, the bottom end of each crown beam unit is provided with a second groove which has a certain depth and is matched with the top end of the fender pile, and the second groove corresponds to the position of the fender pile.

It is further preferred that the second groove and the top end of the fender post are both cylindrical structures.

Preferably, each layer of wale is composed of a plurality of wale units which are connected end to end and are arranged in a full-length mode, and two ends of each wale unit are respectively provided with a second reinforcing steel bar and a second reinforcing steel bar inserting hole which are matched with the adjacent wale units.

Preferably, a third reinforcing steel bar with a certain length is preset on the inner side of each layer of wale unit, and a third reinforcing steel bar inserting hole matched with the three phases of the reinforcing steel bars is correspondingly formed in one end part of the layer of supporting part.

Preferably, the fender post and the upright post are respectively welded with the supporting component into a whole.

The invention provides a rapid construction method of an assembly type multilayer inner support structure, which comprises the steps of designing the sizes of a crown beam, a waist beam and a cross beam according to the excavation size of a foundation pit, prefabricating the reinforced concrete members in a prefabricated yard, and maintaining the prefabricated members for 28 days; the construction method comprises the following steps:

s1, drilling holes in a site by using a rotary drilling rig, if the stratum contains hard soil layers such as broken stones, adopting a pile punching process, and constructing fender piles and upright piles after drilling;

s2, performing waterproof curtain construction on the outer side of the fender pile by using a three-shaft stirrer and a double-pipe high-pressure jet grouting pile machine, wherein adjacent cement-soil stirring piles are meshed with each other;

s3, excavating the soil around the foundation pit fender post, wherein the excavation depth and width correspond to the size of the crown beam;

s4, breaking the concrete on the top of the fender post, cutting off the exposed main reinforcement to make the elevation of the top of the post a section of length higher than the elevation of the bottom of the crown beam; hoisting the prefabricated crown beam to the top, wherein the reserved second grooves at the bottom of the crown beam correspond to the fender piles one by one, and two ends of adjacent crown beam components are embedded into each other until the crown beam components are completely installed;

s5, measuring a connecting line from the upright post pile to the crown beam by using a total station, setting a position of an exposed steel bar on the inner side of the crown beam, and excavating by using an excavator in cooperation with manual excavation until the upper parts of the crown beam and the upright post pile are exposed;

s6, welding support parts on different side faces of the upright post pile to ensure that each support part is aligned with an exposed steel bar I arranged on the inner side of the crown beam;

s7, hoisting the beam member by using a crane, connecting one side of the reserved steel bar jack I with the crown beam, and lapping the other side of the reserved steel bar jack I on the top surface of the upright post pile supporting part, and repeating the steps until all the inner supporting beams in the first layer are completely installed;

s8, continuously excavating downwards to the designed elevation of the bottom surface of the waist rail by using an excavator in cooperation with manual work, chiseling off a concrete protective layer on the side wall of the fender pile, welding a support part and a fender pile stirrup together, and then hoisting the waist rail to the top of the support part;

s9, hoisting the waist rail members by using a crane, wherein the exposed reinforcing steel bars II of the adjacent waist rail members correspond to the reinforcing steel bar insertion holes II, so that the waist rail members are ensured to be integrated;

s10, welding supporting parts on each side face of the upright post pile, wherein the mounting positions of the supporting parts correspond to the positions of the exposed steel bars III preset in the foundation pit of the waist rail in the step S9;

s11, completing hoisting of all the second-layer supporting beams in the same operation as the operation in the step S7;

s12, continuously excavating to the design elevation of the next-layer inner support, and repeating the steps S8-S11 to finish the installation of the next-layer inner support;

s13, excavating the soil body to the bottom of the foundation pit, and sequentially constructing a bottom cushion layer and a bottom plate of the underground single structure and other working procedures.

Compared with the prior art, the invention has the following advantages and beneficial effects:

compared with the traditional internal support construction process, the internal support system comprises the crown beam, the waist beam and the cross beam which are all precast concrete components, has relatively simple structure, can be installed and spliced on a construction site, saves the time of on-site pouring, vibrating and maintaining, ensures the construction quality and greatly improves the construction speed.

Drawings

FIG. 1 is a schematic structural view of a crown beam member of the present invention;

FIG. 2 is a schematic view of the construction of the wale member of the present invention;

FIG. 3 is a schematic structural view of a cross member of the present invention;

FIG. 4 is a schematic view of a post construction of the present invention;

fig. 5 is an overall schematic view of a multi-layer fabricated internal support structure of the present invention.

Reference numerals: 1-fender posts; 2-cement soil triaxial mixing pile; 3-a crown beam; 4-waist rail; 5-a support member; 6-a cross beam; 7-a vertical column pile; 31-groove two; 32-protrusions; 33-reinforcing steel bar I; 34-groove one; 41-a second steel bar jack; 42-reinforcing steel bar III; 43-reinforcing steel bar II; 61-steel bar inserting hole one.

Detailed Description

In order that those skilled in the art will better understand the technical solutions of the present invention, the following description of the preferred embodiments of the present invention is provided in conjunction with specific examples, but it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.

The present invention will be further described with reference to the following examples and figures 1-5, but the invention is not limited thereto.

As shown in fig. 1 to 5, a foundation pit engineering using two-layer inner support is taken as an example (as shown in fig. 5), and a specific embodiment of the present invention is further explained.

As shown in fig. 5, the present embodiment provides a fabricated multi-layer internal support structure, which includes a fender pile 1, a post pile 7, a layer of support members 5 disposed on the fender pile 1, and two layers of support members 5 disposed at intervals along the height direction of the post pile 7; the fender post 1 is positioned at the excavation edge of a foundation pit; a cement triaxial mixing pile 2 is arranged outside the fender post 1 and mainly plays a role in preventing groundwater seepage; the upright post pile 7 is of a lattice column structure formed by welding profile steel or steel plates.

Specifically, a crown beam 3 is embedded at the top end of the fender post 1, and the inner side of the crown beam 3 is detachably connected with a cross beam 6 correspondingly lapped on the top layer supporting part 5; the top end of the supporting part 5 on the fender post 1 is lapped with a wale 4, and the inner side of the wale 4 is detachably connected with a cross beam 6 correspondingly lapped on the supporting part 5.

Further, the crown beam 3 is composed of a plurality of crown beam units which are connected end to end and are arranged in a full-length mode, two ends of each crown beam unit are respectively provided with a protrusion 32 and a groove 34 which are matched with the adjacent crown beam units, and the protrusion 32 and the groove 34 are both rectangular structures.

Furthermore, a first reinforcing steel bar 33 with a certain length is preset on the inner side of each crown beam unit, and a first reinforcing steel bar insertion hole 61 matched with the first reinforcing steel bar 33 is correspondingly formed in one end part of the top-layer supporting part 5. The bottom end of each crown beam unit is provided with a second groove 31 which has a certain depth and is matched with the top end of the fender post 1, and the second groove 31 corresponds to the fender post 1. The second groove 31 and the top end of the fender post 1 are both of cylindrical structures.

Furthermore, each layer of wale 4 is composed of a plurality of wale units which are connected end to end and are arranged in a full-length mode, and two ends of each wale unit are respectively provided with a second reinforcing steel bar 43 and a second reinforcing steel bar inserting hole 41 which are matched with the adjacent wale units. A third reinforcing steel bar 42 with a certain length is preset on the inner side of each layer of wale unit, and a third reinforcing steel bar inserting hole (not shown in the figure) matched with the third reinforcing steel bar 42 is correspondingly formed in one end part of the layer of supporting part 5. The fender post 1 and the upright post 7 are respectively welded with the supporting part 5 into a whole.

Based on the structure, the embodiment provides a rapid construction method of an assembly type multilayer internal support structure, which comprises the following steps:

the method comprises the following steps: on-site measurement and field leveling

The site is leveled before construction, then the measurement mesh points in the site are arranged, the positions of all axes and the ground elevation are released, and the positions of the fender pile 1 and the upright post pile 7 are determined.

Step two: component prefabrication

And (3) prefabricating the crown beam 3, the waist beam 4 and the cross beam 6 in a prefabrication field according to the structural design size, sufficiently vibrating in the prefabrication process, and maintaining for 28 days after removing the formwork.

Step three: construction of fender pile 1, cement triaxial mixing pile 2 and upright pile 7

And (3) rotary drilling holes at set positions of the fender pile 1 and the upright post pile 7 by using a rotary drilling rig, hoisting the reinforcement cage and the lattice post in the dug pile hole, and then pouring cement concrete. For the fender pile 1, cement concrete is poured to a position 0.5m higher than the top of the marked pile so as to clear floating slurry and ensure the quality of a pile body; for the vertical column pile 7, cement concrete is poured to the elevation of the bottom of the foundation pit, and the upper latticed column is exposed. After the concrete of the fender post 1 and the upright post pile 7 is cured for 28 days, using a three-shaft mixer and a double-pipe high-pressure jet grouting pile machine to carry out waterproof curtain construction, wherein adjacent cement mixing piles are engaged with each other to ensure waterproof effect;

step four: pile head breaking and support member 5 welding

And (3) excavating by combining an excavator with manual work, beginning to break the pile top concrete of the fender post after excavating to the designed elevation of the crown beam 3, and welding the supporting part 5 at the top of the upright post pile 7. And (3) cutting off the exposed main ribs after the pile head is broken, wherein the elevation of the pile top is 0.4m higher than the top surface of the supporting part, namely the depth of the fender pile 1 embedded into the crown beam 3.

Step five: hoisting the crown beam 3 and the first layer beam 6

And hoisting the crown beam 3 by using a crane to enable the bottom of the crown beam to be preset with a second cylindrical groove 31 corresponding to the fender post 1, and paying attention to the direction of the crown beam during hoisting to ensure that the first rectangular groove 34 and the protrusion 32 of the adjacent crown beam component are mutually embedded. And if the exposed steel bar I33 is bent, straightening by using a hydraulic straightening machine, and repeating the steps until all the crown beam components are hoisted. And when the cross beam 6 is hoisted, the first exposed top beam steel bar 33 is inserted into the first reserved steel bar insertion hole 61, the other end of the first exposed top beam steel bar is lapped on the top of the supporting part, and all the cross beams are hoisted according to the steps.

Step six: waist rail 4 and second layer cross beam 6 are hoisted

Excavation of the foundation pit is performed to the designed elevation of the bottom surface of the waist rail, the protective layer of the fender post 1 is chiseled off, and the stirrups are exposed. The side surface of the guard post 1 and each surface of the upright post 7 are welded with supporting members 5. And when the wale 4 is hoisted, the direction of the adjacent wale is noticed, and the second exposed reinforcing steel bar 43 of the adjacent wale component is ensured to correspond to the second reserved insertion hole 41. And repeating the steps, and hoisting to finish all the waist beam members. The hoisting step and the attention points of the second layer beam are the same as those in the fifth step.

According to the description and the drawings, a person skilled in the art can easily manufacture or use a fabricated multilayer internal support structure of the present invention, and can produce the positive effects described in the present invention.

Unless otherwise specified, in the present invention, if there is an orientation or positional relationship indicated by terms of "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, rather than 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, therefore, the terms describing orientation or positional relationship in the present invention are for illustrative purposes only, and should not be construed as limiting the present patent, specific meanings of the above terms can be understood by those of ordinary skill in the art in light of the specific circumstances in conjunction with the accompanying drawings. Furthermore, the terms "a," "an," "two," "three," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Unless expressly stated or limited otherwise, the terms "disposed," "connected," and "connected" are used broadly and encompass, for example, being fixedly connected, detachably connected, or integrally 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.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.

Claims (10)

1. An assembled multilayer internal support structure, characterized in that: the pile structure comprises fender posts (1), upright posts (7) and a plurality of layers of supporting parts (5) which are arranged at intervals along the height direction of the fender posts (1) and the upright posts (7), wherein crown beams (3) are embedded at the top ends of the fender posts (1), and the inner sides of the crown beams (3) are detachably connected with cross beams (6) which are correspondingly lapped on the top layer supporting parts (5); the top ends of the supporting parts (5) at different heights of the fender post (1) are lapped with waist beams (4), and the inner side of each layer of waist beam (4) is detachably connected with a cross beam (6) correspondingly lapped on the layer of supporting parts (5).

2. A fabricated multi-layered internal support structure according to claim 1, wherein: the crown beam (3) is composed of a plurality of crown beam units which are connected end to end and are arranged in a through-length mode, and two ends of each crown beam unit are respectively provided with a first bulge (32) and a first groove (34) which are matched with the adjacent crown beam units.

3. A fabricated multi-layer internal support structure according to claim 2, wherein: the first protrusion (32) and the first groove (34) are both rectangular structures.

4. A fabricated multi-layer internal support structure according to claim 2, wherein: a first reinforcing steel bar (33) with a certain length is preset on the inner side of each crown beam unit, and a first reinforcing steel bar insertion hole (61) matched with the first reinforcing steel bar (33) is formed in one end part of the top layer supporting part (5) correspondingly.

5. A fabricated multi-layer internal support structure according to claim 2, wherein: the bottom end of each crown beam unit is provided with a second groove (31) which has a certain depth and is matched with the top end of the fender post (1), and the second groove (31) corresponds to the fender post (1).

6. A fabricated multi-layer internal support structure according to claim 5, wherein: the second groove (31) and the top end of the fender post (1) are both cylindrical structures.

7. A fabricated multi-layered internal support structure according to claim 1, wherein: each layer of wale (4) is composed of a plurality of wale units which are connected end to end and are arranged in a through length mode, and two ends of each wale unit are respectively provided with a second reinforcing steel bar (43) and a second reinforcing steel bar inserting hole (41) which are matched with the adjacent wale units.

8. A fabricated multi-layer internal support structure according to claim 7, wherein: a third reinforcing steel bar (42) with a certain length is preset on the inner side of each layer of wale unit, and a third reinforcing steel bar inserting hole matched with the third reinforcing steel bar (42) is correspondingly formed in one end part of the layer of supporting part (5).

9. A fabricated multi-layered internal support structure according to claim 1, wherein: the fender post (1) and the upright post pile (7) are respectively welded with the supporting part (5) to form a whole.

10. A rapid construction method of an assembled multi-layer inner support structure is characterized in that the sizes of a crown beam (3), a waist beam (4) and a cross beam (6) are designed according to the excavation size of a foundation pit, the reinforced concrete member as claimed in any one of claims 1 to 9 is prefabricated in a prefabricated field, and the prefabricated member is maintained for 28 days; the construction method comprises the following steps:

s1, drilling holes in a site by using a rotary drilling rig, if the stratum contains hard soil layers such as broken stones, adopting a punching pile process, and constructing a fender post (1) and a stand post pile (7) after drilling;

s2, performing waterproof curtain construction by using a three-shaft stirrer and a double-pipe high-pressure jet grouting pile machine on the outer side of the fender pile (1), wherein adjacent cement mixing piles are meshed with each other;

s3, excavating soil around the pile top of the foundation pit fender pile (1), wherein the excavation depth and width correspond to the size of the crown beam (3);

s4, breaking the concrete on the top of the fender post (1), and cutting off the exposed main reinforcement to enable the elevation of the top of the post to be higher than the elevation of the bottom of the crown beam (3) by a section of length; hoisting the prefabricated crown beam (3) to the top, reserving grooves II (31) at the bottom of the crown beam (3) to correspond to the fender piles (1) one by one, and embedding two ends of adjacent crown beam (3) components into each other until all the crown beam (3) components are installed;

s5, measuring a connecting line from the upright post pile (7) to the crown beam (3) by using a total station, setting a position of a first exposed steel bar (33) on the inner side of the crown beam (3), and excavating by using an excavator in cooperation with manual excavation until the upper parts of the crown beam (3) and the upright post pile (7) are exposed;

s6, welding support parts (5) on different side faces of the upright post pile (7) to ensure that each support part (5) is aligned with a first exposed steel bar (33) arranged on the inner side of the crown beam (3);

s7, hoisting the cross beam (6) component by using a crane, connecting one side of the reserved steel bar insertion hole I (61) with the crown beam (3), and overlapping the other side of the reserved steel bar insertion hole I on the top surface of the support part (5) of the upright post pile (7), and repeating the steps until the inner support cross beam (6) in the first layer is completely installed;

s8, continuously excavating downwards to the designed elevation of the bottom surface of the waist beam (4) by using an excavator in cooperation with manual work, chiseling off a concrete protective layer on the side wall of the fender pile (1), welding a support part (5) and a stirrup of the fender pile (1) together, and then hoisting the waist beam (4) on the top of the support part (5);

s9, hoisting the waist beam (4) component by using a crane, wherein the exposed steel bar II (43) of the adjacent waist beam (4) component corresponds to the steel bar jack II (41), so that the waist beam (4) component is ensured to be integrated;

s10, welding supporting parts (5) on each side face of the upright post pile (7), wherein the mounting positions of the supporting parts (5) correspond to the positions of the exposed steel bars III (42) preset in the foundation pit of the waist rail (4) in the step S9;

s11, completing hoisting of all the second-layer supporting beams (6) in the same operation as the operation of the step S7;

s12, continuously excavating to the design elevation of the next-layer inner support, and repeating the steps S8-S11 to finish the installation of the next-layer inner support;

s13, excavating the soil body to the bottom of the foundation pit, and sequentially constructing a bottom cushion layer and a bottom plate of the underground single structure and other working procedures.

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