CN209243795U - The pile foundation support bearing apparatus of pile foundation underpinning in a kind of hole - Google Patents
The pile foundation support bearing apparatus of pile foundation underpinning in a kind of hole Download PDFInfo
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- CN209243795U CN209243795U CN201822078110.6U CN201822078110U CN209243795U CN 209243795 U CN209243795 U CN 209243795U CN 201822078110 U CN201822078110 U CN 201822078110U CN 209243795 U CN209243795 U CN 209243795U
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- pile foundation
- pile
- support
- steel tray
- steel
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Abstract
The utility model discloses a kind of pile foundation support bearing apparatus of pile foundation underpinning in hole, including the hollow steel tray being embedded in tunnel support pile protection arch, the hollow steel tray is set in outside existing pile foundation and in inner edge insertion existing pile foundation, the existing pile foundation stretched out outside tunnel support pile protection arch is truncated, the lower end of existing pile foundation after being truncated is equipped with solid steel tray, and the solid steel tray is fixedly connected with the connector being embedded in support pile protection arch.The utility model has structure simple, convenient and quick construction and the good advantage of support performance, and the connection of stake and tunnel lining structure can be timely completed after tunnel excavation exposure pile foundation, with ensure pile foundation underpinning smoothly complete and the safety of top-out structure.
Description
Technical field
The utility model belongs to a kind of pile foundation support bearing apparatus of pile foundation underpinning in pile foundation underpinning field more particularly to hole.
Background technique
With city underground continuous construction and City Building it is more intensive, the design of city underground route has
When be difficult to avoid passing through the pile foundation group of existing building.When the pile foundation of top existing building invades tunnel clearance, just need
Carry out the construction of pile foundation underpinning.Sometimes it is limited to surface condition insufficient space, pile foundation underpinning construction can not be completed on ground, then be needed
Pile foundation underpinning in hole is carried out, top pile foundation is subjected to support using tunnel itself liner structure, forms common stress system, from
And guarantee the safety of top-out structure.With tunnel earth excavation, pile foundation exposure causes frictional resistance to reduce, and bearing capacity is substantially
Decline, needs to set up device support pile foundation in time after erecting tunnel steel arch frame at this time, to ensure to cut existing building stake before and after stake
The bearing capacity of base.
Pile foundation underpinning usually passes through bar planting in traditional hole, and welds to reach support mesh with the steel grating of tunnel-liner
's.This construction technology step is more, and the construction time is long, in bar planting and welding process, since pile foundation exposure causes frictional resistance
Decline, bearing capacity declines to a great extent, if support is not in time, certainly will will cause the sinking of top-out, will cause top when serious and build
The structure built is destroyed, and construction safety is influenced.
Utility model content
The application aims to solve at least one of the technical problems existing in the prior art.For this purpose, the purpose of this utility model
One of be to provide a kind of simple structure, the pile foundation support of pile foundation underpinning installs in convenient and quick construction and the good hole of support performance
It sets.
In order to solve the above technical problems, the utility model adopts the following technical solution:
The pile foundation support bearing apparatus of pile foundation underpinning in a kind of hole, including the hollow steel tray being embedded in tunnel support pile protection arch,
The hollow steel tray is set in original stake that existing pile foundation is outer and inner edge is embedded in existing pile foundation, outside stretching tunnel support pile protection arch
Base is truncated, and the lower end of the existing pile foundation after being truncated is equipped with solid steel tray, the solid steel tray and is embedded in support pile protection
Connector in arch is fixedly connected.
Further, the hollow steel tray encircles steelframe welding by the support pile protection in I-steel and the support pile protection arch and connects
It connects.
Further, the connector is that one end is welded and fixed with support pile protection arch steelframe, and the other end extends to described
The channel steel being welded and fixed outside tunnel support pile protection arch and with the solid steel tray.
Further, the connector is channel steel, the both ends of the channel steel respectively with support pile protection arch steelframe and solid
Steel tray is welded and fixed.
Further, the area of the hollow steel tray insertion pile foundation accounts for the 30%~50% of pile foundation cross-sectional area.
Compared with prior art, the utility model has structure simple, convenient and quick construction and the good advantage of support performance,
The connection of stake and tunnel lining structure can be completed, after tunnel excavation exposure pile foundation timely to ensure the smooth of pile foundation underpinning
The safety of completion and top-out structure.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is the scheme of installation of hollow steel tray；
Fig. 3 is the scheme of installation of solid steel tray；
Fig. 4 is the Section A-A figure of Fig. 2.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without creative efforts
Every other embodiment obtained, fall within the protection scope of the utility model.
Referring to Fig. 1, the pile foundation support bearing apparatus of pile foundation underpinning in a kind of hole, including the sky being embedded in tunnel support pile protection arch 1
Heart steel tray 2, hollow steel tray 2 are set in outside existing pile foundation 3 and in inner edge insertion existing pile foundations 3, stretch out tunnel support pile protection arch 1
Outer existing pile foundation 3 is truncated, and the lower end of the existing pile foundation 3 after being truncated is equipped with solid steel tray 4, solid steel tray 4 with it is pre-
The connector 5 being embedded in support pile protection arch 1 is fixedly connected.
To improve bearing capacity, the area that hollow steel tray 2 is embedded in pile foundation accounts for the 30%~50% of pile foundation cross-sectional area.
Referring to figs. 2 and 3, the hollow steel tray 2 of the present embodiment and the concreting of support pile protection arch 1 are formed as one first
Sublevel mounting structures, so that it is guaranteed that amputation pile foundation before, tunnel support stake can bearing pile base portion divide stress, with reduce in time tunnel soil
It is influenced caused by the reduction of pile foundation side friction after side is excavated.But since hollow 2 insert depth of steel tray is limited, stake is not can guarantee
Base stress system can be fully converted to tunnel support pile protection arch 1 on, it is therefore desirable to pile foundation amputation after, then add one layer it is solid
Steel tray 4 holds pile foundation truncation surface, forms second layer mounting structures, so that it is guaranteed that tunnel support pile protection arch 1 can be carried completely and be cut
Pile foundation after removing.
Referring to fig. 2, specifically, hollow steel tray 2 is by I-steel 6 and the support pile protection arch steelframe 7 in pile protection arch 1 is ask to weld
Connection, connector 5 be one end and support pile protection encircle steelframe 7 be welded and fixed, the other end extend to support pile protection arch 1 outside and with single solid steel support
The channel steel that disk 4 is welded and fixed.
In the present embodiment, support pile protection arch 7 cross section of steelframe is in H-type and along tunnel extending direction arranged for interval in a row, I-shaped
The both ends of steel 6 are welded to connect with adjacent two support pile protections arch steelframe 7 respectively.
Referring to figures 1-4, the production work progress of the present embodiment is as follows:
(1) first layer mounting structures are constructed:
When tunnel excavation to stake part, applying for preliminary bracing 8 is carried out in time, excavates and just branch should during applying
It avoids damaging stake.While preliminary bracing 8 applies, hollow steel tray 2 is embedded in pile foundation 3 by design position in advance, it is embedding
Entering depth is 35mm, and I-steel 6 is welded on hollow steel tray 2.After the completion of just branch applies, H profile steel steel arch is erected rapidly
Frame forms support pile protection and encircles steelframe 7, and hollow steel tray 2 and support pile protection arch steelframe 7 welded, 6 top of I-steel and H profile steel steel
Frame top carries out welding to form first layer mounting structures.
(2) second layer bearing device is constructed:
It applies set arch reinforcing bar and forms steel grating, reinforcing bar should be bound around stake position, while preparatory welding groove
Steel and support pile protection encircle steelframe 7.Steel grating, which applies, completes after-pouring support pile protection arch concrete, reaches design strength to concrete strength
Afterwards, the pile foundation in truncation intrusion tunnel.The channel steel of solid steel tray 4 and preparatory embedment set arch is welded, to form the second layer
Mounting structures.
Following several points should be paid attention in the construction process:
(1) the steelframe arrangement spacing at underpinned pile should be designed construction according to the diameter of stake, ensure that structure is strong
There are enough spaces to carry out the welding of hollow steel tray 2 and I-steel 6 in the case where degree.
(2) the channel steel size welded in advance should be not less than 30mm by exposure support pile protection arch concrete surface enough, be no more than
50mm to ensure that solid steel tray 4 has enough welding spaces, and will not be invaded in tunnel double-lining.Ordinary circumstance can be used
12# channel steel.
Application project example:
No. ten parking lots Xian Yitian of Shenzhen Metro enter and leave line Tunneling by mining method and are about 83m, wear sea under about 13~52m sections intermediate
Close manual inspection platform and overpass.Customs inspection platform is made of two layers of middle part monitoring center and surrounding examination platform, and examination platform is high
0.5m, using the pile for prestressed pipe of C80, Φ 400mm, the long 25m of stake has 18 pile bases to invade Mining Method section tunnel.It is limited to ground
Situation is complicated, and intrusion pile foundation is more, and route changes and moves difficulty, needs to carry out pile foundation underpinning in underground.The engineering, which uses, utilizes tunnel
Road liner structure underpins the construction method of pile foundation, adds one layer of support pile protection arch in tunnel-liner and underpins to carry needs by a section stake
Base, used pile foundation bearing device is the present embodiment bearing device before cutting stake.
This section of bored tunnel in 2018 September 5 be excavated to pile foundation at first, construction group is after first branch has applied, only with 5
Hour by pile foundation support to steel arch-shelf, and applying for support pile protection arch, the amputation of pile foundation are completed in 3 days.Remaining 17
The time that stake completes to underpin pile foundation at required time and first is essentially identical, and journey is passed through under entire tunneling lasts two months, top
The settlement Control of building sufficiently proves quickly realize stake in Tunnel using the present embodiment bearing device within 10mm
The construction that base changes.
Above-described embodiment is only to clearly demonstrate examples for clearly illustrating the present invention, rather than the restriction to embodiment.
For those of ordinary skill in the art, other various forms of variations can also be made on the basis of the above description
Or it changes.Here without can not be also exhaustive to all embodiments.And the obvious variation thus amplified out
Or it changes among still in the protection scope of the utility model.
Claims (5)
1. the pile foundation support bearing apparatus of pile foundation underpinning in a kind of hole, including the hollow steel tray being embedded in tunnel support pile protection arch,
Be characterized in that: the hollow steel tray is set in outside existing pile foundation and in inner edge insertion existing pile foundation, stretches out tunnel support pile protection arch
Outer existing pile foundation is truncated, and the lower end of the existing pile foundation after being truncated is equipped with solid steel tray, the solid steel tray and pre-
The connector being embedded in support pile protection arch is fixedly connected.
2. the pile foundation support bearing apparatus of pile foundation underpinning in hole according to claim 1, it is characterised in that: the hollow steel tray
Encircle steelframe by the support pile protection in I-steel and the support pile protection arch to be welded to connect.
3. the pile foundation support bearing apparatus of pile foundation underpinning in hole according to claim 2, it is characterised in that: the connector is slot
Steel, the both ends of the channel steel encircle steelframe with the support pile protection respectively and solid steel tray is welded and fixed.
4. the pile foundation support bearing apparatus of pile foundation underpinning in hole according to claim 3, it is characterised in that: the support pile protection encircles steel
Frame cross section is in H-type and along tunnel extending direction arranged for interval in a row, and the both ends of the I-steel are respectively and described in adjacent two
Pile protection arch steelframe is ask to be welded to connect.
5. the pile foundation support bearing apparatus of pile foundation underpinning in hole according to claim 1-4, it is characterised in that: the sky
The area of heart steel tray insertion pile foundation accounts for the 30%~50% of pile foundation cross-sectional area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822078110.6U CN209243795U (en) | 2018-12-11 | 2018-12-11 | The pile foundation support bearing apparatus of pile foundation underpinning in a kind of hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822078110.6U CN209243795U (en) | 2018-12-11 | 2018-12-11 | The pile foundation support bearing apparatus of pile foundation underpinning in a kind of hole |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209243795U true CN209243795U (en) | 2019-08-13 |
Family
ID=67532604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822078110.6U Active CN209243795U (en) | 2018-12-11 | 2018-12-11 | The pile foundation support bearing apparatus of pile foundation underpinning in a kind of hole |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209243795U (en) |
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2018
- 2018-12-11 CN CN201822078110.6U patent/CN209243795U/en active Active
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Zhao Yong Inventor after: Chen Jianhua Inventor after: Liu Houpu Inventor after: Zhang Xuemin Inventor after: Yang Junsheng Inventor after: Chen Xinlei Inventor after: Liu Xueqin Inventor after: Hong Yuan Inventor after: Zhang Hongwei Inventor after: Jin Ping Inventor after: Ji Guangkun Inventor after: Dong Zonglei Inventor after: Guo Shuangxi Inventor before: Zhang Hongwei Inventor before: Yang Junsheng Inventor before: Chen Xinlei Inventor before: Jin Ping Inventor before: Ji Guangkun Inventor before: Dong Zonglei Inventor before: Guo Shuangxi Inventor before: Chen Jianhua Inventor before: Liu Houpu Inventor before: Zhang Xuemin |