CN111794284A - Support changing system for post-cast strip and construction method thereof - Google Patents

Support changing system for post-cast strip and construction method thereof Download PDF

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Publication number
CN111794284A
CN111794284A CN202010621397.1A CN202010621397A CN111794284A CN 111794284 A CN111794284 A CN 111794284A CN 202010621397 A CN202010621397 A CN 202010621397A CN 111794284 A CN111794284 A CN 111794284A
Authority
CN
China
Prior art keywords
adjusting
section
movable section
movable
post
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010621397.1A
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Chinese (zh)
Inventor
吴万杰
张友光
王晓东
吴奔
李毅
马浩浩
詹望来
全宇
汤伟
王军
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7th Engineering Co Ltd of MBEC
Original Assignee
7th Engineering Co Ltd of MBEC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 7th Engineering Co Ltd of MBEC filed Critical 7th Engineering Co Ltd of MBEC
Priority to CN202010621397.1A priority Critical patent/CN111794284A/en
Publication of CN111794284A publication Critical patent/CN111794284A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00Independent underground or underwater structures; Retaining walls
    • E02D29/16Arrangement or construction of joints in foundation structures
    • 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 application relates to a support replacing system for a post-cast strip and a construction method thereof, and relates to the field of equipment for engineering construction. This trade system of propping includes the foundation ditch and the device that props that trades that sets up along its length direction interval, it props the device and includes that at least one trades the festival section and adjusts the festival section to trade, trade the one end of propping the festival section be used for supporting hold in on one of them side of foundation ditch, it includes expansion end and adjusting part to adjust the festival section, the one end of expansion end be used for with trade prop the festival section and keep away from the one end of foundation ditch links to each other, the other end be used for supporting hold in on the opposite side of foundation ditch, adjusting part locates the activity is served, and is used for adjusting the length of expansion end, be equipped with fixed subassembly on the expansion end, fixed subassembly is used for fixing the expansion end. The utility model provides a trade and prop system stable in structure has solved among the correlation technique when post-cast strip is under construction foundation ditch security low, construction cycle length and the difficult problem of guaranteeing of quality.

Description

Support changing system for post-cast strip and construction method thereof
Technical Field
The application relates to the field of equipment for engineering construction, in particular to a support changing system for a post-cast strip and a construction method thereof.
Background
At present, the main purpose of post-cast strip design is to solve the problem of temporary construction joints caused by concrete shrinkage deformation and temperature stress influence in the construction process of a cast-in-place reinforced concrete structure. In the subway construction, because an enclosure structure exists between a main structure and an auxiliary structure of a station, when post-cast strip construction is carried out, the post-cast strip construction can be carried out only after the enclosure structure is firstly dismantled.
In the related technology, when the fender post is dismantled, a pile jumping method is generally adopted for dismantling, namely sectional dismantling, after one section of fender post is dismantled, steel bar binding and concrete pouring at the position of a post-cast strip are immediately carried out to close one section, then the rest fender post is dismantled to close the post-cast strip, and at least two cycles are carried out to connect the fender posts into a whole; and backfilling plain concrete in a post-cast strip, removing the post-cast strip above the structural surface of the fender post, then sectionally performing plain backfilling concrete and pecking off the fender post, and performing post-cast strip construction after cleaning is completed.
However, the problems of poor construction quality of small sections of the post-cast strip, long construction period, long exposure time of a foundation pit and poor safety can be caused when the first method is adopted, the construction period is relatively long when the second method is adopted, the quality is not easy to guarantee, and the construction cost is increased while resources are wasted because plain concrete is repeatedly backfilled and pecked.
Disclosure of Invention
The embodiment of the application provides a support changing system for a post-cast strip and a construction method thereof, and aims to solve the problems that in the related technology, the safety of a foundation pit is low, the construction period is long, and the quality is not easy to guarantee during the construction of the post-cast strip.
In a first aspect, a support replacing system for a post-cast strip is provided, which includes a foundation pit, at least one support replacing device is arranged in the foundation pit along the length direction of the foundation pit at intervals, and the support replacing device includes:
one end of the support replacing section is used for abutting against one side of the foundation pit;
the adjusting section comprises a movable end and an adjusting component, one end of the movable end is used for being far away from the support section, one end of the foundation pit is connected, the other end of the foundation pit is used for abutting against the other side of the foundation pit, the adjusting component is arranged on the movable end and used for adjusting the length of the movable end, a fixing component is arranged on the movable end, and the fixing component is used for fixing the movable end.
In some embodiments, the active end comprises:
the first movable section is provided with an inner cavity, one end of the first movable section is connected with one end, far away from the foundation pit, of the support replacing section, and the fixing assembly is arranged on the first movable section;
a second active segment configured to: one end of the second movable section, which is close to the first movable section, is at least partially positioned in the inner cavity of the first movable section, the adjusting component is arranged on the second movable section and is used for adjusting the overlapping length of the second movable section and the first movable section, and the fixing component is used for fixing the overlapping length of the second movable section and the first movable section.
In some embodiments, the securing assembly comprises:
a first tuning through-hole configured to: the first adjusting through hole is formed in the first movable section, and one end, close to the first movable section, of the second movable section is at least partially located in the first adjusting through hole;
and the fixing piece penetrates through the first adjusting through hole, and one side of the fixing piece, which is close to the second movable section, abuts against the second movable section so as to be used for fixing the overlapping length of the second movable section and the first movable section.
In some embodiments, the adjusting assembly includes at least two adjusting jacks, all of the adjusting jacks are symmetrically disposed along the periphery of the second movable section, and the telescopic end of each adjusting jack abuts against the end surface of the first movable section close to the second movable section, and the adjusting jacks are configured to adjust the overlapping length of the second movable section and the first movable section by controlling the length of the telescopic end.
In some embodiments, the number of the adjusting jacks is 2, and two adjusting jacks are arranged diagonally.
In some embodiments, a first thread is disposed on an outer side surface of the second movable section, a second adjusting through hole is disposed on an inner side surface of the adjusting assembly, a second thread matched with the first thread is disposed on an inner side surface of the second adjusting through hole, and the adjusting assembly is rotatably disposed on the second movable section and is configured to adjust an overlapping length of the second movable section and the first movable section by rotating along a length direction of the second movable section.
In some embodiments, the strut-changing section includes four symmetrically spaced angle steels, a reinforcing plate is disposed between every two adjacent angle steels, and two sides of the reinforcing plate are respectively connected and fixed with the corresponding angle steels.
In some embodiments, two ends of the support changing segment and the movable end are respectively provided with a connecting flange, and adjacent connecting flanges are connected through a bolt structure.
In some embodiments, the fixture comprises a plurality of wedge shaped steel blocks.
In a second aspect, a construction method for a support changing system of a post-cast strip is provided, and the steps of the construction method comprise:
arranging at least one support replacing device at intervals in the length direction of the foundation pit;
and abutting one end of the support replacing section against one side of the foundation pit, abutting one end of the movable end against the other side of the foundation pit, connecting the other end of the movable end with one end of the support replacing section far away from the foundation pit, adjusting the length of the movable end by using the adjusting assembly, and fixing the movable end by using the fixing assembly.
The beneficial effect that technical scheme that this application provided brought includes:
the embodiment of the application provides a trade system of propping for post-cast strip, it is through being equipped with at least one along its length direction interval and trade strutting arrangement in the foundation ditch, and will trade the both ends of strutting arrangement and support respectively and hold the corresponding side at the foundation ditch, trade the fixed section that the strut section that props on the device is unchangeable for length, the expansion end on the adjustment section can change length under the regulation of adjusting part, in order to play the effect of supporting the foundation ditch, do benefit to going on of follow-up construction, avoid the foundation ditch because of the overlength of exposure and the poor problem of security, in addition, adopt fixed subassembly to fix the expansion end after the completion of adjustment, guarantee the stability of whole structure, this trade system of propping has solved the problem that the foundation ditch security is low when post-cast strip construction among the correlation technique betterly, construction cycle is long and the quality is difficult for guaranteeing.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a support changing system for a post-cast strip according to embodiment 1 of the present application;
fig. 2 is a schematic structural diagram of a strut replacement section of a strut replacement system for a post-cast strip according to embodiment 1 of the present application;
FIG. 3 is a side view of a shoring section of the shoring system for a post-cast strip provided in example 1 of the present application;
FIG. 4 is a schematic structural diagram of a movable end of the support changing system for the post-cast strip according to embodiment 2 of the present application;
FIG. 5 is a side view of a second active segment of the bracing system for the post-cast strip as provided in example 2 of the present application;
fig. 6 is a schematic structural diagram of an active segment of the bracing change system for the post-cast strip according to embodiment 3 of the present application.
In the figure: 1-support replacing section, 10-angle steel, 11-reinforcing plate, 2-adjusting section, 20-adjusting jack, 21-first movable section, 22-second movable section, 23-first adjusting through hole, 24-fixing piece and 3-foundation pit.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a trade system of propping for post-cast strip, it can solve among the correlation technique when post-cast strip is under construction foundation ditch security low, construction cycle length and the difficult problem of guaranteeing of quality.
Example 1
Referring to fig. 1, the support replacing system includes a foundation pit 3, the foundation pit 3 is generally in a long strip shape with a certain depth, and is a concrete structure, when post-cast strip construction is performed, the problems that construction period is long and safety of the foundation pit 3 is poor often exist, in order to solve the problems, at least one support replacing device is arranged in the foundation pit 3 of the support replacing system at intervals along the length direction of the foundation pit 3, the support replacing device mainly includes at least one support replacing section 1 and an adjusting section 2, wherein one end of the support replacing section 1 is used for being abutted against one side of the foundation pit 3, the adjusting section 2 specifically includes a movable end and an adjusting assembly, one end of the movable end is used for being fixedly connected with one end of the support replacing section 1, which is far away from the foundation pit 3, and the other end is used for being abutted against the other side of the foundation pit 3, and forms a main body structure of support. The adjusting component is arranged on the movable end and used for adjusting the length of the movable end, wherein the length of the movable end is mainly increased to support two sides of the foundation pit 3, so that construction is guaranteed, in addition, the movable end is also provided with a fixing component, and the fixing component is used for fixing the movable end, so that the length of the movable end is kept unchanged, and the supporting effect is guaranteed.
Specifically, the movable end mainly comprises a first movable section 21 and a second movable section 22, wherein an inner cavity is arranged on the first movable section 21, one end of the first movable section 21 is connected with one end of the support replacing section 1, which is far away from the foundation pit 3, and a fixing assembly is arranged on the first movable section 21; the second activity segment 22 is configured to: one end of the second movable section 22 close to the first movable section 21 is at least partially positioned in the inner cavity of the first movable section 21, the adjusting component is arranged on the second movable section 22 and used for adjusting the overlapping length of the second movable section 22 and the first movable section 21, and the fixing component is used for fixing the overlapping length of the second movable section 22 and the first movable section 21.
Specifically, the fixing assembly mainly includes a first regulation through hole 23 and a fixing member 24, wherein the first regulation through hole 23 is configured to: the first adjusting through hole 23 is formed in the first movable section 21, at least a portion of one end, close to the first movable section 21, of the second movable section 22 is located in the first adjusting through hole 23, the fixing member 24 penetrates through the first adjusting through hole 23, and one side, close to the second movable section 22, of the fixing member 24 abuts against the second movable section 22 so as to be used for fixing the overlapping length of the second movable section 22 and the first movable section 21. Because the role of the support changing device is mainly to open the two sides of the foundation pit 3 within a certain range, a restoring force is basically always present between the first movable section 21 and the second movable section 22, and one end of the second movable section 22 close to the first movable section 21 is at least partially positioned in the first adjusting through hole 23, so that the overlapped section of the first movable section 21 and the second movable section 22 can be fixed by the action of the fixing piece 24.
Specifically, as shown in fig. 2 to 3, the length of the support replacing section 1 has various types, the length dimensions include 0.3m, 0.5m, 1m and 1.5m, and can be adjusted according to the length of the post-cast strip, the support replacing section 1 mainly includes four angle steels 10 arranged symmetrically at intervals, a plurality of reinforcing plates 11 are arranged between every two adjacent angle steels 10, and both sides of each reinforcing plate 11 are respectively connected and fixed with the corresponding angle steel 10 to form a section which is substantially in a rectangular parallelepiped shape. Connecting flanges are arranged at two ends of the support replacing section 1 and the movable end, adjacent connecting flanges are connected through a bolt structure, and the connecting flanges, the first movable section 21, the second movable section 22 and the angle steel 10 are integrally formed in a welding mode.
Specifically, the fixing member 24 includes a plurality of wedge-shaped steel blocks, and the number of the wedge-shaped steel blocks can be adjusted according to the actual overlapping length, so as to ensure the stability of the fixing.
Example 2
Referring to fig. 4 to 5, the difference between the present embodiment and embodiment 1 is that the adjusting assembly specifically includes at least two adjusting jacks 20, all the adjusting jacks 20 are symmetrically disposed along the periphery of the second movable section 22, each adjusting jack 20 includes a fixed end and a telescopic end, and the telescopic end of each adjusting jack 20 abuts against the end surface of the first movable section 21 close to the second movable section 22 and is used for adjusting the overlapping length of the second movable section 22 and the first movable section 21 by controlling the length of the telescopic end. The environment of the adjusting component is under a compressive load of 10-100 t.
Specifically, the number of the adjusting jacks 20 is 2, and the two adjusting jacks 20 are arranged diagonally, so that the stability and uniformity during adjustment are ensured to the maximum extent.
Example 3
Referring to fig. 6, the difference between this embodiment and embodiment 1 is that a first thread is disposed on an outer side surface of the second movable section 22, a second adjusting through hole is disposed on an inner side surface of the adjusting assembly, a second thread matched with the first thread is disposed on an inner side surface of the second adjusting through hole, and the adjusting assembly is rotatably disposed on the second movable section 22 and is configured to adjust an overlapping length of the second movable section 22 and the first movable section 21 by rotating along a length direction of the second movable section 22. The use environment of the adjusting component is that when the compression load is not more than 10t, in addition, two handles which are symmetrically arranged are arranged on the adjusting component for the convenience of rotating the adjusting component.
Example 4
The embodiment provides a construction method of a support replacing system for a post-cast strip, which mainly comprises the following steps: firstly, the length and the number of the support replacing sections 1 are determined according to the length of a post-cast strip, at least one support replacing device is arranged in a foundation pit 3 at intervals along the length direction of the foundation pit, one end of the support replacing section 1, close to one side of the foundation pit 3, on the support replacing device is abutted against the corresponding side, one end of the movable end is abutted against the other corresponding side of the foundation pit 3, the other end of the movable end and one end, far away from the foundation pit 3, of the support replacing section 1 are fixedly connected through bolts, the length of the movable end is adjusted through an adjusting assembly, and the movable end is inserted into a first adjusting through hole 23 through a fixing piece after the length is determined so as to fix the movable end. Wherein, the pressurized load is when no more than 10t, and adjusting part adopts the screw thread form of rotating, and operating personnel can along the length direction rotation adjusting part of second activity section 22, when the pressurized load is at 10 ~ 100t, adjusting part adopts and adjusts jack 20, will adjust jack 20 pressurization to the rated value can.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A trade system of propping for post-cast strip, it includes foundation ditch (3), be equipped with at least one along its length direction interval in foundation ditch (3) and trade and prop the device, characterized in that, trade and prop the device and include:
the support replacing segment (1) is used for abutting against one side of the foundation pit (3);
adjust festival section (2), it includes expansion end and adjusting part, the one end of expansion end be used for with it keeps away from to trade strut section (1) the one end of foundation ditch (3) links to each other, the other end be used for supporting hold in on the opposite side of foundation ditch (3), adjusting part locates the expansion end is last, and is used for adjusting the length of expansion end, be equipped with fixed subassembly on the expansion end, fixed subassembly is used for fixing the expansion end.
2. The system of claim 1, wherein the free end comprises:
the first movable section (21) is provided with an inner cavity, one end of the first movable section (21) is connected with one end, far away from the foundation pit (3), of the support replacing section (1), and the first movable section (21) is provided with the fixing assembly;
a second active segment (22) configured to: one end, close to the first movable section (21), of the second movable section (22) is at least partially located in an inner cavity of the first movable section (21), the adjusting assembly is arranged on the second movable section (22) and used for adjusting the overlapping length of the second movable section (22) and the first movable section (21), and the fixing assembly is used for fixing the overlapping length of the second movable section (22) and the first movable section (21).
3. The system of claim 2, wherein the securing assembly comprises:
a first adjustment through hole (23) configured to: the first adjusting through hole (23) is formed in the first movable section (21), and one end, close to the first movable section (21), of the second movable section (22) is at least partially located in the first adjusting through hole (23);
and the fixing piece (24) is arranged on the first adjusting through hole (23) in a penetrating manner, one side, close to the second movable section (22), of the fixing piece (24) is abutted against the second movable section (22) so as to be used for fixing the overlapping length of the second movable section (22) and the first movable section (21).
4. A bracing change system for a post-cast strip as claimed in claim 2, wherein: the adjusting assembly comprises at least two adjusting jacks (20), the adjusting jacks (20) are symmetrically arranged along the periphery of the second movable section (22), the telescopic ends of the adjusting jacks (20) are abutted to the end face, close to the second movable section (22), of the first movable section (21), and the adjusting jacks (20) are used for adjusting the overlapping length of the second movable section (22) and the first movable section (21) by controlling the length of the telescopic ends.
5. The system of claim 4, wherein: the number of the adjusting jacks (20) is 2, and the two adjusting jacks (20) are arranged diagonally.
6. A bracing change system for a post-cast strip as claimed in claim 2, wherein: be equipped with first screw thread on the lateral surface of second activity section (22), be equipped with second adjusting through hole on adjusting part's the medial surface, just be equipped with on the medial surface of second adjusting through hole with the second screw thread that first screw thread matches, adjusting part rotates and locates on the second activity section (22), and be used for through following the length direction of second activity section (22) rotates in order to adjust the overlapping length of second activity section (22) and first activity section (21).
7. A bracing change system for a post-cast strip as claimed in claim 1, wherein: the support replacing segment (1) comprises four symmetrical angle steels (10) arranged at intervals, reinforcing plates (11) are arranged between every two adjacent angle steels (10), and two sides of each reinforcing plate (11) are respectively connected and fixed with the corresponding angle steel (10).
8. A bracing change system for a post-cast strip as claimed in claim 1, wherein: and connecting flanges are arranged at two ends of the support replacing section (1) and the movable end, and the adjacent connecting flanges are connected through a bolt structure.
9. A bracing change system for a post-cast strip as claimed in claim 3, wherein: the fixture (24) comprises a plurality of wedge-shaped steel blocks.
10. A construction method for a shoring system for a post-cast strip as claimed in claim 1, characterized by comprising the steps of:
at least one support replacing device is arranged in the foundation pit (3) at intervals along the length direction of the foundation pit;
one end of the support replacing section (1) is abutted against one side of the foundation pit (3), one end of the movable end is abutted against the other side of the foundation pit (3), the other end of the movable end is connected with one end, far away from the foundation pit (3), of the support replacing section (1), the length of the movable end is adjusted by the aid of the adjusting assembly, and the movable end is fixed by the aid of the fixing assembly.
CN202010621397.1A 2020-06-30 2020-06-30 Support changing system for post-cast strip and construction method thereof Pending CN111794284A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010621397.1A CN111794284A (en) 2020-06-30 2020-06-30 Support changing system for post-cast strip and construction method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010621397.1A CN111794284A (en) 2020-06-30 2020-06-30 Support changing system for post-cast strip and construction method thereof

Publications (1)

Publication Number Publication Date
CN111794284A true CN111794284A (en) 2020-10-20

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Application Number Title Priority Date Filing Date
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2299597A (en) * 1995-04-05 1996-10-09 Mechplant Limited Apparatus for supporting an excavation
CN102409681A (en) * 2011-08-02 2012-04-11 浙江华铁建筑安全科技股份有限公司 Double top seat single-head movable end
CN204849776U (en) * 2015-07-10 2015-12-09 中煤第三建设(集团)有限责任公司 Loose structure and bearing structure among bearing structure
CN110565652A (en) * 2019-09-30 2019-12-13 中铁第四勘察设计院集团有限公司 telescopic steel pipe cross brace structure for long and narrow foundation pit and support changing method
CN110629764A (en) * 2019-09-27 2019-12-31 中国一冶集团有限公司 Annular internal support system of foundation pit and support replacement construction method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2299597A (en) * 1995-04-05 1996-10-09 Mechplant Limited Apparatus for supporting an excavation
CN102409681A (en) * 2011-08-02 2012-04-11 浙江华铁建筑安全科技股份有限公司 Double top seat single-head movable end
CN204849776U (en) * 2015-07-10 2015-12-09 中煤第三建设(集团)有限责任公司 Loose structure and bearing structure among bearing structure
CN110629764A (en) * 2019-09-27 2019-12-31 中国一冶集团有限公司 Annular internal support system of foundation pit and support replacement construction method
CN110565652A (en) * 2019-09-30 2019-12-13 中铁第四勘察设计院集团有限公司 telescopic steel pipe cross brace structure for long and narrow foundation pit and support changing method

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