CN105350546A - Assembly type foundation pit bracing concrete filled steel tube support and construction method thereof - Google Patents

Assembly type foundation pit bracing concrete filled steel tube support and construction method thereof Download PDF

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Publication number
CN105350546A
CN105350546A CN201510851712.9A CN201510851712A CN105350546A CN 105350546 A CN105350546 A CN 105350546A CN 201510851712 A CN201510851712 A CN 201510851712A CN 105350546 A CN105350546 A CN 105350546A
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CN
China
Prior art keywords
concrete
steel tube
filled steel
concrete filled
support
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CN201510851712.9A
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Chinese (zh)
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张继红
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张继红
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Priority to CN201510851712.9A priority Critical patent/CN105350546A/en
Publication of CN105350546A publication Critical patent/CN105350546A/en
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • E02D17/04Bordering surfacing or stiffening the sides of foundation pits

Abstract

The invention relates to an assembly type foundation pit bracing concrete filled steel tube support structure and a construction method thereof and belongs to the field of foundation pit engineering. The concrete filled steel tube support structure comprises the four parts of bracing purlins or ring beams (14), steel tube or steel tube concrete supports, joint connecting concrete (9) and joint connecting reinforcing steel bars. The defects of concrete supports, such as high cost and long construction period are solved, and the defects of steel structure supports, such as low rigidity and difficult construction quality control are compensated. The foundation pit bracing inner support structure provided by the invention is high in strength, is high in rigidity, can apply stress, can be used in combination with concrete supports, has wide applicability, can be recycled and reutilized, is high in safety, is low in cost, saves the construction period, and is great in environment-friendly benefit.

Description

Assembling bracing of foundation pit concrete filled steel tube supports and construction method
Technical field
The present invention relates to the Foundation Pit Support Engineering field in geotechnical engineering field.
Background technology
Prior art, for darker foundation ditch, general employing campshed or diaphragm wall are as space enclosing structure, adopt composite steel tunnel support or steel bar concrete support system as horizontal bearing structure, combinations thereof bracing members comprises combined steel pipe and supports and combined bracing members, and its advantage is recyclable recycling, but composite steel tunnel support node intensity is low, and the rigidity of support system is low, be out of shape larger.There is the low significant deficiency of support stiffness especially in the fish belly sill supporting of recent appearance.Although existing composite steel tunnel support technology can adopt the method for Shi Hanzhang to reduce the distortion of composite steel tunnel support system, but foundation ditch support system distribution of force uneven and in time with surrounding enviroment (as temperature, periphery load, foundation ditch shoveling mode) change and change, the prestressing force applied may cause component internal force distribution again, support internal force can be caused to increase, discontinuity equalization, the new potential problems such as inharmonious.Therefore composite steel tunnel support is still very restricted in deep foundation pit support, to darker foundation ditch or the foundation ditch that importance is higher, shape is more complicated, main still based on reinforced concrete support at present, and is safer support pattern recognized within the industry.But reinforced concrete support cost is high, and the engineering time is long, need curing time long, and Demolition Construction trouble, the Demolition Construction time is long, and execute-in-place is taken a lot of work effort, not by Shi Hanzhang Reducing distortion.Reinforcing bar after dismounting and concrete are waste product, and recycle value is extremely low.
Summary of the invention
First object of the present invention is to provide a kind of assembling bracing of foundation pit concrete filled steel tube and supports, this concrete filled steel tube Construction of Supporting speed is fast, and cost is low, and degree of safety is high, be suitable for foundation depth large, be suitable for span large, significantly can reduce the quantity of column and stand column pile, rigidity is high, and can Shi Hanzhang, recyclable recycling, can be used in combination with reinforced concrete support system, strong adaptability.
This assembling bracing of foundation pit concrete filled steel tube supports to comprise and encloses purlin or collar tie beam, steel pipe or concrete filled steel tube support, Node connectedness concrete and Node connectedness reinforcing bar four part, wherein enclose purlin or collar tie beam is the component be connected with the soil-baffling structure of bracing of foundation pit, steel pipe or concrete filled steel tube are supported for level of approximation direction and lay the structure bearing the part Water And Earth Pressures that soil-baffling structure transmits, Node connectedness concrete is for supporting enclosing purlin or collar tie beam and steel pipe or concrete filled steel tube, between steel pipe or concrete filled steel tube support, steel pipe or concrete filled steel tube support that to be connected by adjacent members with junction between concrete support be the concrete structure of common beaer, Node connectedness reinforcing bar is be positioned at the reinforcing bar that Node connectedness concrete strengthens Node connectedness concrete and adjacent member bonding strength.
In above-mentioned assembling bracing of foundation pit concrete filled steel tube supports, above-mentioned Node connectedness reinforcing bar comprises concrete filled steel tube dowel, U-shaped joint bar, V-arrangement strengthens armpit muscle three part, concrete filled steel tube dowel is to place with steel pipe or concrete filled steel tube supports parallel and the part be connected with steel pipe or concrete filled steel tube firm supporting builds the reinforcing bar in Node connectedness concrete, it is be positioned at adjacent steel pipe or concrete filled steel tube to support that infall passes through or be firmly connected to steel pipe or concrete filled steel tube supporting member or its connector while be approximately parallel to steel pipe or concrete filled steel tube supports that V-arrangement strengthens armpit muscle, another side is approximately perpendicular to the reinforcing bar of building in Node connectedness concrete of adjacent steel pipe or concrete filled steel tube strut angle bisector, U-shaped joint bar be shape approximation primary and secondary " U " shape be distributed in upper and lower surface and side covers the reinforcing bar of building in Node connectedness concrete that V-arrangement strengthens armpit muscle.
In above-mentioned assembling bracing of foundation pit concrete filled steel tube supports, the end that above-mentioned concrete filled steel tube supports arranges the flange of perforate.
In above-mentioned assembling bracing of foundation pit concrete filled steel tube supports, above-mentioned Node connectedness reinforcing bar can be set to often hold there is double nut structure bear prestressed control bolt.
Second object of the present invention is to provide a kind of assembling bracing of foundation pit concrete filled steel tube and supports installation and Demolition Construction method, the method overcomes the construction difficult problem that concrete filled steel tube supported weight is large, and speed of application is fast, and cost is low.
This assembling bracing of foundation pit concrete filled steel tube supports to install and comprises the following steps with Demolition Construction method:
A) by part soil excavation to support base position;
B) by collar tie beam or enclose purlin, the steel pipe of prefabricated segmentation or concrete filled steel tube and support amplifier to design attitude;
C) Node connectedness reinforcing bar, steel concrete substituted segment reinforcing bar are installed;
D) Node connectedness concrete, steel concrete substituted segment concrete is built;
E) concrete that maintenance is cast-in-place;
F) operating period is entered;
G) after pit backfill or support replacement complete, cutting or broken Node connectedness concrete;
H) steel pipe or concrete filled steel tube support is reclaimed.
Supporting at above-mentioned assembling bracing of foundation pit concrete filled steel tube installs with Demolition Construction method, step b above-mentioned) in, crane can be adopted prefabricated collar tie beam or enclose purlin, the steel pipe of prefabricated segmentation or concrete filled steel tube and support and be transported to design attitude, also can be rolled is transported to design attitude.
Supporting at above-mentioned assembling bracing of foundation pit concrete filled steel tube installs with Demolition Construction method, the step c above-mentioned) in, in reinforcement installation process, Shi Hanzhang can be supported to steel pipe or concrete filled steel tube.
Supporting at above-mentioned assembling bracing of foundation pit concrete filled steel tube installs with Demolition Construction method, the step c above-mentioned) in, length or part in irregular shape are supported, reinforced concrete support section as an alternative can be adopted.
Assembling bracing of foundation pit concrete filled steel tube of the present invention supports and construction method, achieve the recycling of the support system of high strength high rigidity, and the distortion of going along with sb. to guard him can be reduced when installation by Shi Hanzhang, relative to bracing members, the rigidity and intensity that support are increased substantially, can be used in combination with reinforced concrete support, be convenient to install, reliable construction quality; Relative to reinforced concrete support, support span large, and can reduce to go along with sb. to guard him distortion, recyclable recycling by Shi Hanzhang, decrease the quantity of column, increase substantially speed of application, and significantly save engineering cost.
Accompanying drawing explanation
Fig. 1 is that one embodiment of the present of invention assembling bracing of foundation pit concrete filled steel tube used supports generalized section;
Fig. 2 is one embodiment of the present of invention assembling bracing of foundation pit concrete filled steel tube supporting base end portion schematic cross-sections used;
Fig. 3 is that one embodiment of the present of invention assembling bracing of foundation pit concrete filled steel tube used is supported on node place Shi Hanzhang stage schematic diagram;
Fig. 4 is that one embodiment of the present of invention assembling bracing of foundation pit concrete filled steel tube used is supported on segmentation node place bolt connection diagram;
Fig. 5 is that one embodiment of the present of invention assembling bracing of foundation pit concrete filled steel tube used is supported on segmentation node place steel concrete connection diagram;
Fig. 6 is that one embodiment of the present of invention assembling bracing of foundation pit concrete filled steel tube used supports and reinforced concrete support link node organigram;
Fig. 7 is that one embodiment of the present of invention assembling bracing of foundation pit concrete filled steel tube used supports K shape link node arrangement of reinforcement schematic diagram;
Fig. 8 is that one embodiment of the present of invention assembling bracing of foundation pit concrete filled steel tube used supports " ten " font link node arrangement of reinforcement schematic diagram;
Fig. 9 is that one embodiment of the present of invention assembling bracing of foundation pit concrete filled steel tube used supports T-shaped link node arrangement of reinforcement schematic diagram;
Detailed description of the invention
As an embodiment as shown in Fig. 1 ~ Fig. 9 of the present invention, main purpose is to introduce structure structure, operating principle and the construction method that a kind of assembling bracing of foundation pit concrete filled steel tube of the present invention supports.This assembling bracing of foundation pit concrete filled steel tube supports to comprise and encloses purlin or the support of collar tie beam (14), steel pipe or concrete filled steel tube, Node connectedness concrete (9) and Node connectedness reinforcing bar four part.Wherein enclose purlin or collar tie beam (14) is the component be connected with the soil-baffling structure of bracing of foundation pit, can be steel work, reinforced concrete structure or encased structures, the shape in its cross section can be rectangle, box-shaped, I-shaped or T-shaped, also can be circular.Steel pipe or concrete filled steel tube are supported for level of approximation direction and lay the structure bearing the part Water And Earth Pressures that soil-baffling structure transmits, it can be steel pipe that steel pipe or concrete filled steel tube support, also can be concrete filled steel tube, its cross sectional shape can be circular, rectangle, box-shaped, I-shaped or T-shaped, when for time circular, the mode of rolling can be adopted to transport in foundation ditch, constructability.As adopted concrete filled steel tube to support, then can reach the object that intensity is high, rigidity is large, span is large.As adopted concrete filled steel tube as support, structure structure as shown in Figure 1 can be adopted.In FIG, the diameter of steel pipe (1) can be selected between 500mm ~ 1200mm, and the wall thickness of steel pipe (1) can be selected between 5mm ~ 30mm.Filling concrete (2) can be poured into, to improve its mechanical property in steel pipe (1).At the two ends of steel pipe (1), end plate (3) and mounting flange (5) can be installed, and stiffener (4) can be adopted to improve steel pipe (1) and end plate (3), bonding strength between mounting flange (5).For the ease of installing, can arrange connecting hole (6) on end plate (3) with mounting flange (5), connecting hole (6) can be screwed hole, also can be the hole that sidewall is smooth, as shown in Figure 2.Node connectedness concrete (9) be enclose purlin or collar tie beam (14) support with steel pipe or concrete filled steel tube, support between junction adjacent members is connected concrete structure for common beaer, if be supported for the combining structure of steel pipe or concrete filled steel tube support and reinforced concrete support, then the support and connection of bi-material are an entirety by the mode that can refer to Fig. 6.In figure 6, connecting bolt (7) doubles as the reinforcing bar in reinforced concrete support, can adopt in end reinforced tapping as connecting bolt (7).Connection between the end plate (3) that connecting bolt (7) and concrete filled steel tube support or mounting flange (5) can adopt double nut as shown in Figure 6 to construct, namely all fix with nut at the upper-lower position of connecting hole (6) as shown in Figure 6, also connecting hole (6) can be made as screwed hole with tooth, connecting bolt (7) is connected with concrete filled steel tube firm supporting.In figure 6, stirrup (10) can be adopted connecting bolt (7) side direction to be fixed.The reinforcing bar of Node connectedness concrete (9) and adjacent member bonding strength strengthened by Node connectedness reinforcing bar for being positioned at Node connectedness concrete (9).In the present embodiment, kind and the laying of Node connectedness reinforcing bar can refer to Fig. 3 ~ Fig. 9, in Fig. 3 ~ Fig. 6, and a kind of pattern that connecting bolt (7) is Node connectedness reinforcing bar.In Fig. 7 ~ Fig. 9, Node connectedness reinforcing bar comprises concrete filled steel tube dowel (13), U-shaped joint bar (12), V-arrangement strengthens armpit muscle (11) three part, concrete filled steel tube dowel (13) is for place with steel pipe or concrete filled steel tube supports parallel and the part be connected with steel pipe or concrete filled steel tube firm supporting builds the reinforcing bar in Node connectedness concrete (9), V-arrangement is strengthened armpit muscle (11) and is supported that infall passes through steel pipe or concrete filled steel tube supporting member or its connector while be approximately parallel to steel pipe or concrete filled steel tube supports for being positioned at adjacent steel pipe or concrete filled steel tube, another side is approximately perpendicular to the reinforcing bar of building in Node connectedness concrete (9) of adjacent steel pipe or concrete filled steel tube strut angle bisector, what U-shaped joint bar (12) was shape approximation primary and secondary " U " shape is laid in upper and lower surface and the reinforcing bar of building in Node connectedness concrete (9) of side covering V-arrangement reinforcement armpit muscle (11).The length of concrete filled steel tube dowel (13) should meet the requirement of anchoring strength; The base length of U-shaped joint bar (12) should meet the requirement that parcel V-arrangement strengthens armpit muscle (11), the length of the dual-side of U-shaped joint bar (12) should meet the requirement of anchoring strength, the length being parallel to steel pipe (1) direction that V-arrangement strengthens armpit muscle (11) should meet anchoring strength requirement, and the length perpendicular to adjacent supports Bisector of angle direction should reach contiguous steel pipe (1).In the present embodiment, the characteristic that concrete filled steel tube intensity is high can also be utilized, concrete filled steel tube is circularized or arch, and form annular, arch or tubular braced structures in conjunction with other accessories.At the present embodiment with lower part, composition graphs 1 ~ Fig. 5, introduce assembling bracing of foundation pit concrete filled steel tube support install with Demolition Construction method.The method comprises following 8 steps.In the first step, by the part soil excavation within the scope of foundation ditch to support base position, can full-face tunneling to this absolute altitude, also only can be excavated to support base absolute altitude in Support Position.Complete the first step, enter second step.In this step, by collar tie beam or enclose purlin (14), the steel pipe of prefabricated segmentation or concrete filled steel tube and support amplifier to design attitude.As place allows, crane can be adopted prefabricated collar tie beam or enclose purlin (14), the steel pipe of prefabricated segmentation or concrete filled steel tube and support and be transported to design attitude.In the present embodiment, assembly concrete-filled steel tube supports and can enclose purlin, collar tie beam with cast-in-situ steel reinforced concrete or support used in combination.For prefabricated units, crane handling can be adopted.As in foundation ditch, place is bad, on earth's surface, prefabricated assembly concrete-filled steel tube can be supported handling to the position of specifying, recycling digging machine is rolled and is transported to design attitude.Support if first supports following second, the 3rd road or the 4th road, first support or upper support or column together can be utilized as row hanging beam supporter, utilize the row temporarily installed to hang and support is transported to design attitude.In this step, on column, bracket can be welded in advance, so that the accurate location supported and installation.Complete second step, enter the 3rd step.In this step, Node connectedness reinforcing bar, steel concrete substituted segment reinforcing bar are installed, wherein Node connectedness reinforcing bar installation and laying can refer to above and Fig. 3 ~ Fig. 9 carries out.In this step, before node concreting, Shi Hanzhang can be supported to assembly concrete-filled steel tube.Method as shown in Figure 3 can be adopted, jack (8) is placed in node gap location, prefabricated concrete filled steel tube is supported Shi Hanzhang, after prestress application completes, two sections be supported fixing with connecting bolt (7), as shown in Figure 4.Complete the 3rd step, enter the 4th step.Build Node connectedness concrete or steel concrete substituted segment concrete.In this step, early strength concrete can be adopted to save the duration, also can adopt the bonding strength between slightly expanded concrete raising Node connectedness concrete (9) and steel pipe (1), as shown in Figure 5.Complete the 4th step, enter the 5th step.This step is the concrete curing phase.After maintenance completes, complete the 5th step, enter the 6th step.This step is mainly the operating period of assembly concrete-filled steel tube, comprises that foundation ditch is cut the earth, the construction, pit backfill etc. of agent structure and support replacement.Complete the 6th step, enter the 7th step.After pit backfill or support replacement complete, cutting or broken Node connectedness concrete (9), the integrality adopting the method for cutting or broken Node connectedness concrete (9) that assembly concrete-filled steel tube can be kept to support, is convenient to recycling.Complete the 7th step, enter the 8th step, steel pipe or concrete filled steel tube are supported recycling.Fork truck or bracket first can be adopted steel pipe or concrete filled steel tube to be supported hold, support is transported to the outward transport of foundation ditch limit after completing the 7th step, also steel tube concrete can be supported and be rolled into the outward transport of foundation ditch limit.
This patent includes but not limited to other construction methods of the alternative use of professional person in this area.

Claims (3)

1. an assembling bracing of foundation pit concrete filled steel tube supports, it is characterized in that comprising and enclose purlin or collar tie beam (14), steel pipe or concrete filled steel tube support, Node connectedness concrete (9) and Node connectedness reinforcing bar four part, wherein enclose purlin or collar tie beam (14) is the component be connected with the soil-baffling structure of bracing of foundation pit, steel pipe or concrete filled steel tube are supported for level of approximation direction and lay the structure bearing the part Water And Earth Pressures that soil-baffling structure transmits, Node connectedness concrete (9) is for supporting with steel pipe or concrete filled steel tube enclosing purlin or collar tie beam (14), between steel pipe or concrete filled steel tube support, steel pipe or concrete filled steel tube support that to be connected by adjacent members with junction between concrete support be the concrete structure of common beaer, Node connectedness reinforcing bar is be positioned at the reinforcing bar that Node connectedness concrete strengthens Node connectedness concrete and adjacent member bonding strength.
2. assembling bracing of foundation pit concrete filled steel tube according to claim 1 supports, it is characterized in that above-mentioned Node connectedness reinforcing bar comprises concrete filled steel tube dowel (13), U-shaped joint bar (12), V-arrangement strengthens armpit muscle (11) three part, concrete filled steel tube dowel (13) is for place with steel pipe or concrete filled steel tube supports parallel and the part be connected with steel pipe or concrete filled steel tube firm supporting builds the reinforcing bar in Node connectedness concrete (9), V-arrangement is strengthened armpit muscle (11) and is supported that infall passes through or be firmly connected to steel pipe or concrete filled steel tube supporting member or its connector while be approximately parallel to steel pipe or concrete filled steel tube supports for being positioned at adjacent steel pipe or concrete filled steel tube, another side is approximately perpendicular to the reinforcing bar of building in Node connectedness concrete (9) of adjacent steel pipe or concrete filled steel tube strut angle bisector, what U-shaped joint bar (12) was shape approximation primary and secondary " U " shape is distributed in upper and lower surface and the reinforcing bar of building in Node connectedness concrete (9) of side covering V-arrangement reinforcement armpit muscle (11).
3. assembling bracing of foundation pit concrete filled steel tube as claimed in claim 1 supports and installs and a Demolition Construction method, comprises the following steps:
A) by part soil excavation to support base position;
B) by collar tie beam or enclose purlin, the steel pipe of prefabricated segmentation or concrete filled steel tube and support amplifier to design attitude;
C) Node connectedness reinforcing bar, steel concrete substituted segment reinforcing bar are installed;
D) Node connectedness concrete (9), steel concrete substituted segment concrete is built;
E) concrete that maintenance is cast-in-place;
F) operating period is entered;
G) after pit backfill or support replacement complete, cutting or broken Node connectedness concrete (9);
H) steel pipe or concrete filled steel tube support is reclaimed.
CN201510851712.9A 2015-11-30 2015-11-30 Assembly type foundation pit bracing concrete filled steel tube support and construction method thereof Pending CN105350546A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110158616A (en) * 2019-06-19 2019-08-23 北京城建北方集团有限公司 A kind of foundation pit supporting construction construction method

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CN204311458U (en) * 2014-10-31 2015-05-06 上海市政交通设计研究院有限公司 A kind of well construction foundation ditch sizing bracing members
CN205188981U (en) * 2015-11-30 2016-04-27 张继红 Assembled foundation ditch is gone along with sb. to guard him steel pipe concrete and is supported

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Publication number Priority date Publication date Assignee Title
CN2390933Y (en) * 1999-06-04 2000-08-09 同济大学 Square steel pipe concrete beam and column jointing gusset
CN101418572A (en) * 2008-10-17 2009-04-29 上海隧道工程股份有限公司 Pit construction method employing precast support
CN102505696A (en) * 2011-10-28 2012-06-20 上海建瓴工程咨询有限公司 Support system of rear support removing type section steel-concrete double-enclosing-purlin foundation pit and construction method
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CN102635118A (en) * 2012-03-26 2012-08-15 北京工业大学 Square steel pipe concrete supporting structure for foundation pit support
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110158616A (en) * 2019-06-19 2019-08-23 北京城建北方集团有限公司 A kind of foundation pit supporting construction construction method

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