CN110258522A - The closed ground-connecting-wall for protruding into basement rock encloses well construction - Google Patents
The closed ground-connecting-wall for protruding into basement rock encloses well construction Download PDFInfo
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- CN110258522A CN110258522A CN201910562006.0A CN201910562006A CN110258522A CN 110258522 A CN110258522 A CN 110258522A CN 201910562006 A CN201910562006 A CN 201910562006A CN 110258522 A CN110258522 A CN 110258522A
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- 239000011435 rock Substances 0.000 title claims abstract description 48
- 238000010276 construction Methods 0.000 title claims abstract description 46
- 239000011248 coating agent Substances 0.000 claims abstract description 25
- 238000000576 coating method Methods 0.000 claims abstract description 25
- 239000011440 grout Substances 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000012360 testing method Methods 0.000 claims abstract description 13
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 6
- 238000003780 insertion Methods 0.000 claims abstract description 3
- 230000037431 insertion Effects 0.000 claims abstract description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 37
- 239000010959 steel Substances 0.000 claims description 37
- 238000007569 slipcasting Methods 0.000 claims description 18
- 230000002787 reinforcement Effects 0.000 claims description 13
- 238000009412 basement excavation Methods 0.000 claims description 12
- 239000004567 concrete Substances 0.000 claims description 10
- 238000003466 welding Methods 0.000 claims description 7
- 238000005266 casting Methods 0.000 claims description 6
- 239000002689 soil Substances 0.000 claims description 4
- 238000000605 extraction Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 238000011049 filling Methods 0.000 claims description 2
- 239000002893 slag Substances 0.000 claims description 2
- 239000002002 slurry Substances 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000005070 sampling Methods 0.000 abstract description 6
- 239000004576 sand Substances 0.000 abstract description 4
- 230000007812 deficiency Effects 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 15
- 238000005553 drilling Methods 0.000 description 4
- 238000011065 in-situ storage Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 239000008267 milk Substances 0.000 description 2
- 210000004080 milk Anatomy 0.000 description 2
- 235000013336 milk Nutrition 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000011405 expansive cement Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000009705 shock consolidation Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/18—Bulkheads or similar walls made solely of concrete in situ
Abstract
The present invention relates to a kind of closed ground-connecting-walls for protruding into basement rock to enclose well construction, belongs to exploration technical field of construction.The present invention influences the deficiency big, quantity of sampling quantity is few and field test condition is undesirable on deep layer of sand sampling disturbance for conventional surveying techniques, proposes that a kind of closed ground-connecting-wall for protruding into basement rock encloses well construction.The present invention includes ground, ground successively includes coating and basement rock from top to bottom, it further include ground-connecting-wall and grout curtain, ground-connecting-wall is formed using reinforced concrete structure, surrounding enclosed encloses well construction, ground-connecting-wall is arranged in coating and in lower end insertion basement rock, and grout curtain is arranged in the basement rock of ground-connecting-wall bottom.Coating depth is usually more than 30m.Supporting is carried out using Horizontal steelwork bracing inside ground-connecting-wall, has poured earth's surface collar tie beam at the top of ground-connecting-wall, and enclose the shaft bottom in well in ground-connecting-wall and be provided with dewatering well.
Description
Technical field
The present invention relates to a kind of closed ground-connecting-walls for protruding into basement rock to enclose well construction, belongs to exploration technical field of construction.
Background technique
Conventional survey method mainly based on the exploration such as probing, shallow vertical shaft, field test only can be carried out other pressure examination, feeler inspection,
The limited experimentations such as vertical and horizontal seismic wave test.Probing is a kind of exploitation method for being largely used to verify sand gravel layer thickness, it can be with
Coring identifies geologic structure, divides stratigraphic boundary, while can carry out hydrogeological test, comprehensive logging and deep dynamic consolidation operation,
To seek the Penetration Signature on stratum and more intuitively describe geologic feature in hole；Current drilling technique can be accomplished to cover
Layer more than 500 meters of depth of drilling, but since drill bit is smaller, drive sampling quantity is few, big to the disturbing influence of soil sample, as drilling is deep
Degree increases, and above-mentioned influence is all the more obvious；It on the other hand, is more than field test difficulty increasing in hole after certain depth such as 50m,
Test method and evaluation criterion are both needed to further investigate.Shallow shaft depths are generally less than 10m, and prospecting personnel can observe directly geology
Structure accurately and reliably, and is convenient for sketch；Original state ground sample can be therefrom taken without restriction and is used as large-scale in-situ test.
The most widely used coating exploration engineering of above two hydraulic and hydroelectric engineering, it is difficult to meet deep coating original state and take
Sample and in-situ test.For the hydroelectric project of part southwest, dam foundation coating is deep, and supporting course is based on fine grained,
It finds out coating especially deep coating physico mechanical characteristic, water reason characteristic, establishes coating mechanical characteristic and buried depth relationship, it is quasi-
Really the problems such as evaluation dam foundation coating sedimentation and deformation, sand liquefaction, stability of dam foundation, leakage and seepage stability, the dam foundation is provided
The Structure Calculations parameter indexes such as mechanical strength, bearing capacity, permeability, anti-macroseism and liquefaction performance resistivity energy, are that dam engineering designs
Key core basis.
Summary of the invention
The technical problems to be solved by the present invention are: big on deep layer of sand sampling disturbance influence for conventional surveying techniques,
The deficiency that quantity of sampling quantity is few and field test condition is undesirable proposes that a kind of closed ground-connecting-wall for protruding into basement rock encloses well construction.
To solve above-mentioned technical problem the technical scheme adopted by the invention is that: the closed ground-connecting-wall for protruding into basement rock encloses well
Structure, including ground, ground include successively from top to bottom coating and basement rock, further include ground-connecting-wall and grout curtain, ground-connecting-wall
Using reinforced concrete structure, surrounding formed it is enclosed enclose well construction, ground-connecting-wall is arranged in coating and lower end is inserted into
In basement rock, grout curtain is arranged in the basement rock of ground-connecting-wall bottom.Coating depth is usually more than 30m.
Further, ground-connecting-wall is the rectangle well surrounded by four sides wall, mutually overlapped between the four sides wall of ground-connecting-wall,
And seam injected hole is respectively set in seam crossing.
Further, seam injected hole slip casting is protruded into the wall base rock of ground-connecting-wall.
Further, further including Horizontal steelwork bracing, Horizontal steelwork bracing is from top to bottom stratified and set on quadrangle on ground-connecting-wall,
Each layer of Horizontal steelwork bracing is made of four slip casting steel pipes, pre-buried steel of each slip casting steel-pipe welding in two adjacent surfaces ground-connecting-wall
On plate, pre-embedded steel slab is welded on the steel reinforcement cage of ground-connecting-wall by embedded bar.
Further, having poured earth's surface collar tie beam at the top of ground-connecting-wall, and the shaft bottom in well is enclosed in ground-connecting-wall and is provided with precipitation
Well.Earth's surface collar tie beam is poured, when can prevent from enclosing the construction of well excavation supporting, more than ground water and other sundries are fallen into well.Setting
The purpose of dewatering well is to provide dry ground operating environment.
Well construction is enclosed for the above-mentioned closed ground-connecting-wall for protruding into basement rock, can be implemented as follows:
It is all poured in ground-connecting-wall and completes and reach age 6 months or more, by pre-embedment grouting pipe to basement rock and ground-connecting-wall
Interior grouting forms closed grout curtain under wall；
It is enclosed in well what ground-connecting-wall was formed later, excavates coating, until being excavated to shaft bottom.It is covered to make full use of in well
Layer is tested and is sampled, and interface elevation is covered lower than base in shaft bottom.
Wherein ground-connecting-wall is preferably using the rectangle well surrounded by four sides wall, wherein being a phase in two face walls positioned opposite
Ground-connecting-wall, in addition two face walls are the second stage of ground-connecting-wall, and ground-connecting-wall, which pours, was divided to for two phases constructed, and are included the following steps:
A, a phase ground-connecting-wall slot section is constructed；
B, the steel reinforcement cage merogenesis of ground-connecting-wall is hung in a phase ground-connecting-wall slot section with crawler crane, decentralization is in place, until all
Steel reinforcement cage installs；
C, slot both ends are placed in using junction block before a phase ground-connecting-wall slot casting concrete, then casting concrete, to
After concrete initial set, junction block is pulled up, form smooth semi-cylindrical at the both ends of a phase ground-connecting-wall and is applied for the second stage of slot
Two guide holes of work form a joint face after the completion of the second stage of slot construction herein；
D, the second stage of ground-connecting-wall slot construction, reinforcing bar cage hoisting, concreting, construction method and step a~c phase are carried out
Together；
E, before ground-connecting-wall pours, pre-embedment grouting pipe in slot and on one, the second stage of ground-connecting-wall joint face, and make pre-buried grouting
The lower end of pipe is in the bottom of pouring hole；
F, ground-connecting-wall, which all pours, completes and reaches age 6 months or more, by above-mentioned pre-embedment grouting pipe to basement rock and ground
Company is in the milk within the walls, closing one, the second stage of ground-connecting-wall seam areas, and forms closed grout curtain under wall.
Ground-connecting-wall formed enclose excavated in well when, supporting should be carried out in time, preferred embodiment is that ground-connecting-wall inner wall is set
It is equipped with Horizontal steelwork bracing, Horizontal steelwork bracing is from top to bottom stratified and set on quadrangle on ground-connecting-wall, and each layer of Horizontal steelwork bracing is by four
Root slip casting steel pipe is constituted, and on the pre-embedded steel slab of two adjacent surfaces ground-connecting-wall, pre-embedded steel slab passes through pre- each slip casting steel-pipe welding
Reinforcement welding is buried on the steel reinforcement cage of ground-connecting-wall；
Ground-connecting-wall formed enclose excavated in well when, include the following steps:
H, well inner covering layer is enclosed using hand excavation, layering carries out, and construction personnel enters and leaves and slags tap using gantry crane handling,
Emergency safety climbing ladder can be also installed on the borehole wall simultaneously；
I, it excavates gap and prune job face, pump drainage ponding is required according to field test, extraction soil sample；
J, pre-embedded steel slab is cleaned out on the ground-connecting-wall inner wall excavated out, Horizontal steelwork bracing is welded and is installed, and to level
Bracing members carry out slip casting and enrich, and enclose well inner covering layer excavation and staggeredly carry out with Horizontal steelwork bracing installation；
K, h~j process is recycled, until being excavated to shaft bottom, and dewatering well is set in shaft bottom.
The beneficial effects of the present invention are: the ground-connecting-wall of reinforced concrete structure is inserted into basement rock, four sides wall is mutually overlapped, and is formed
Stable encloses well construction, provides safety guarantee to enclose construction in well, testing；The Horizontal steelwork bracing of immediate support on ground-connecting-wall, with
The welding of ground-connecting-wall embedded bar, further strengthens wall stability；Grout curtain is set in ground-connecting-wall bottom, in ground-connecting-wall clinch
Position carries out joint grouting, and well barrier performance is enclosed in enhancing；It encloses well excavation pit setting dewatering well and dry ground operating environment is provided.
Detailed description of the invention
Fig. 1 is diagrammatic cross-section of the invention.
Fig. 2 is the A-A schematic diagram of Fig. 1.
Fig. 3 is the B-B schematic diagram of Fig. 1.
Component marks in figure: coating 1, basement rock 2, ground-connecting-wall 3, a phase ground-connecting-wall 31, the second stage of ground-connecting-wall 32, embedded bar
41, pre-embedded steel slab 42, Horizontal steelwork bracing 5, seam injected hole 6, grout curtain 7, dewatering well 8, shaft bottom 9, earth's surface collar tie beam 10, base cover
Interface 11, ground 12.
Specific embodiment
Below in conjunction with the accompanying drawings and embodiment the invention will be further described.
As shown in Figure 1 to Figure 3, the present invention includes ground, and ground includes successively from top to bottom coating 1 and basement rock 2, is also wrapped
Include ground-connecting-wall 3 and grout curtain 7, ground-connecting-wall 3 using reinforced concrete structure, surrounding formed it is enclosed enclose well construction, ground connects
Wall 3 is arranged in coating 1 and in lower end insertion basement rock 2, and grout curtain 7 is arranged in the basement rock 2 of 3 bottom of ground-connecting-wall.It covers
1 depth of cap rock is usually more than 30m.When implementation, is all poured in ground-connecting-wall 3 and complete and reach age 6 months or more, by pre-buried
Grout pipe is in the milk into basement rock 2 and ground-connecting-wall 3, forms closed grout curtain 7 under wall, the depth of grout curtain 7 should be according to infiltration
Stream calculation determines；It is enclosed in well what ground-connecting-wall 3 was formed later, excavates coating 1, until being excavated to shaft bottom 9, and set in shaft bottom 9
Set dewatering well 8.To make full use of well inner covering layer 1 to be tested and sampled, 11 elevation of interface is covered lower than base in shaft bottom 9.
For convenience of construction, and guaranteeing stable structure, ground-connecting-wall 3 is the rectangle well surrounded by four sides wall, the four of ground-connecting-wall 3
It is mutually overlapped between face wall and seam injected hole 6 is respectively set in seam crossing.To make structure more stable, seam slip casting
6 slip casting of hole is protruded into the wall base rock 2 of ground-connecting-wall 3.When ground-connecting-wall 3 preferably uses the rectangle well surrounded by four sides wall, wherein
Be a phase ground-connecting-wall 31 in two face walls positioned opposite, in addition two face walls are the second stage of ground-connecting-wall 32, ground-connecting-wall 3 pour be divided to two phases into
Row construction.
Ground-connecting-wall 3 formed enclose excavated in well when, supporting should be carried out in time, preferred embodiment is 3 inner wall of ground-connecting-wall
It is provided with Horizontal steelwork bracing 5, Horizontal steelwork bracing 5 is from top to bottom stratified and set on quadrangle on ground-connecting-wall 3, each layer of Horizontal steelwork bracing
5 are made of four slip casting steel pipes, and each slip casting steel-pipe welding is on the pre-embedded steel slab 42 of two adjacent surfaces ground-connecting-wall 3, pre-buried steel
Plate 42 is welded on the steel reinforcement cage of ground-connecting-wall 3 by embedded bar 41.The supporting type taken in well, branch are enclosed what excavation was formed
Shield opportunity and supporting parameter design should all carry out the comprehensive argument and analysis of Technological Economy and determine.
In addition, having poured earth's surface collar tie beam 10 at the top of ground-connecting-wall 3, and the shaft bottom 9 in well is enclosed in ground-connecting-wall 3 and is provided with dewatering well
8.Earth's surface collar tie beam 10 is poured, when can prevent from enclosing the construction of well excavation supporting, the water and other sundries on 12 or more ground are fallen into well.If
The purpose for setting dewatering well 8 is to provide dry ground operating environment.
The present invention is preferably implemented as follows:
A, 31 slot section of a phase ground-connecting-wall is constructed；Drilling equipment and form of construction work are chosen according to coating 1 and 2 characteristic of basement rock；
B, the steel reinforcement cage merogenesis of ground-connecting-wall 3 is hung in 31 slot section of a phase ground-connecting-wall with crawler crane, decentralization is in place, until complete
Portion's steel reinforcement cage installs；
C, slot both ends are placed in using junction block before 31 slot casting concrete of a phase ground-connecting-wall, then casting concrete,
After concrete initial set, junction block is pulled up, forms smooth semi-cylindrical at the both ends of a phase ground-connecting-wall 31 and for the second stage of slot
Two guide holes of hole construction form a joint face after the completion of the second stage of slot construction herein；
D, the 32 slot construction of the second stage of ground-connecting-wall, reinforcing bar cage hoisting, concreting, construction method and step a~c phase are carried out
Together；
E, before ground-connecting-wall 3 pours, pre-embedment grouting pipe in slot and on one, 3 joint face of the second stage of ground-connecting-wall, and make pre-buried filling
The lower end of slurry pipe is in the bottom of pouring hole；
F, ground-connecting-wall 3, which all pours, completes and reaches age 6 months or more, by above-mentioned pre-embedment grouting pipe to 2 He of basement rock
Grouting in ground-connecting-wall 3, closing one, 3 seam areas of the second stage of ground-connecting-wall, and form closed grout curtain 7 under wall；
G, earth's surface collar tie beam 10 is poured at the top of ground-connecting-wall 3, when preventing from enclosing the construction of well excavation supporting, the water on 12 or more ground and
Other sundries are fallen into well；
H, well inner covering layer 1 is enclosed using hand excavation, and layering carries out, and construction personnel is entered and left and slagged tap and hung using gantry crane
Fortune；
I, it excavates gap and prune job face, pump drainage ponding is required according to field test, extraction soil sample；
J, pre-embedded steel slab 42 is cleaned out on 3 inner wall of ground-connecting-wall excavated out, Horizontal steelwork bracing 5 is welded and is installed, and is right
Horizontal steelwork bracing 5 carries out slip casting and enriches, and encloses the excavation of well inner covering layer 1 and staggeredly carries out with the installation of Horizontal steelwork bracing 5, with immediate support
For principle；
K, h~j process is recycled, until being excavated to shaft bottom 9, and dewatering well 8 is set in shaft bottom 9；It is covered to make full use of in well
Cap rock 1 is tested and is sampled, and 11 elevation of interface is covered lower than base in shaft bottom 9.
Embodiment:
Coating 1 depth about 70m, for the mechanics and seepage characteristic for investigating thoroughly coating 1, using protrude into basement rock closedly
Even walled well construction carries out the original state sampling and in-situ test of coating 1.Ground-connecting-wall 3 encloses well using reinforced concrete structure, wall
Thick 1.2m encloses well dead size 6.4m × 6.4m.Ground-connecting-wall 3 is inserted into 2 depth 10m of basement rock, ground to protrude into weak weathered rocks as control
Even 3 total depth 80m of wall.3 bottom of ground-connecting-wall sets 32 7 preformed holes of grout curtain, is carried out seeping control analysis according to basement rock seepage characteristic,
The average grout penetration 20m in basement rock 2.To guarantee that ground-connecting-wall 3 encloses the stabilization of well construction, well inner wall is enclosed in ground-connecting-wall 3 and sets 26 layers
Horizontal steelwork bracing 5, by Structure Calculation, Horizontal steelwork bracing 5 sets one layer every 2m~5m height, wherein 3 top stress of ground-connecting-wall
Small, interlayer interval is big, and lower part stress is big, and interlayer interval is small.Every layer of Horizontal steelwork bracing 5 includes the steel pipe of four diameter 600mm, point
C35 expansive cement mortar is perfused on two adjacent surfaces ground-connecting-wall 3 in other diagonal brace in steel pipe；It is each pre-buried on the support section of ground-connecting-wall 3
The pre-embedded steel slab 42 of one piece of 30mm thickness and the U-shaped anchoring embedded bar 41 being welded on steel plate, embedded bar 41 and pre-embedded steel slab
It is cast in concrete on 42 steel reinforcement cage by being welded on ground-connecting-wall 3.To guarantee 3 slot section seam seepage control effect of ground-connecting-wall, respectively
A 3 slot section seam crossing of ground-connecting-wall sets the built-in pipe of 2 seam injected holes 6,6 slip casting depth of seam injected hole to ground-connecting-wall 3 respectively
Following 5m.
Claims (9)
1. the closed ground-connecting-wall for protruding into basement rock encloses well construction, including ground, ground successively include from top to bottom coating (1) and
Basement rock (2), it is characterised in that: further include ground-connecting-wall (3) and grout curtain (7), ground-connecting-wall (3) using reinforced concrete structure,
Surrounding formed it is enclosed enclose well construction, ground-connecting-wall (3) setting is in coating (1) and in lower end insertion basement rock (2), curtain
Curtain grouting (7) setting is in the basement rock (2) of ground-connecting-wall (3) bottom.
2. protruding into the closed ground-connecting-wall of basement rock as described in claim 1 encloses well construction, it is characterised in that: ground-connecting-wall (3) is
The rectangle well surrounded by four sides wall, mutually overlaps between the four sides wall of ground-connecting-wall (3) and is respectively arranged in seam crossing and connect
It stitches injected hole (6).
3. the closed ground-connecting-wall for protruding into basement rock as claimed in claim 2 encloses well construction, it is characterised in that: seam injected hole
(6) slip casting is protruded into the wall base rock (2) of ground-connecting-wall (3).
4. the closed ground-connecting-wall for protruding into basement rock as claimed in claim 2 encloses well construction, it is characterised in that: further include horizontal steel
Support (5), Horizontal steelwork bracing (5) is from top to bottom stratified and set on quadrangle on ground-connecting-wall (3), each layer of Horizontal steelwork bracing (5) by
Four slip casting steel pipes are constituted, and each slip casting steel-pipe welding is on the pre-embedded steel slab (42) of two adjacent surfaces ground-connecting-wall (3), pre-buried steel
Plate (42) is welded on the steel reinforcement cage of ground-connecting-wall (3) by embedded bar (41).
5. the closed ground-connecting-wall for protruding into basement rock as described in claim 1 encloses well construction, it is characterised in that: ground-connecting-wall (3) top
Portion has poured earth's surface collar tie beam (10), and encloses the shaft bottom (9) in well in ground-connecting-wall (3) and be provided with dewatering well (8).
6. the closed ground-connecting-wall for protruding into basement rock as described in any one of claim 1 to 5 encloses the implementation method of well construction,
It is characterized by comprising the following steps:
It is all poured in ground-connecting-wall (3) and completes and reach age 6 months or more, by pre-embedment grouting pipe to basement rock (2) He Dilian
Grouting in wall (3), forms closed grout curtain (7) under wall；
It encloses in well, excavates coating (1) what ground-connecting-wall (3) were formed later, until being excavated to shaft bottom (9).
7. the implementation method that the closed ground-connecting-wall for protruding into basement rock as claimed in claim 6 encloses well construction, which is characterized in that ground
Even wall (3) be the rectangle well surrounded by four sides wall, wherein in two face walls positioned opposite for a phase ground-connecting-wall (31), in addition two
Face wall is the second stage of ground-connecting-wall (32), and ground-connecting-wall (3), which pours, was divided to for two phases constructed, and is included the following steps:
A, phase ground-connecting-wall (31) slot section is constructed；
B, the steel reinforcement cage merogenesis of ground-connecting-wall (3) is hung in phase ground-connecting-wall (31) slot section with crawler crane, decentralization is in place, until complete
Portion's steel reinforcement cage installs；
C, slot both ends are placed in using junction block before phase ground-connecting-wall (31) slot casting concrete, then casting concrete, to
After concrete initial set, junction block is pulled up, forms smooth semi-cylindrical at the both ends of a phase ground-connecting-wall (31) and for the second stage of slot
Two guide holes of hole construction form a joint face after the completion of the second stage of slot construction herein；
D, the second stage of ground-connecting-wall (32) slot construction, reinforcing bar cage hoisting, concreting, construction method and step a~c phase are carried out
Together；
E, before ground-connecting-wall (3) pours, pre-embedment grouting pipe in slot and on one, the second stage of ground-connecting-wall (3) joint face, and make pre-buried filling
The lower end of slurry pipe is in the bottom of pouring hole；
F, ground-connecting-wall (3), which all pours, completes and reaches age 6 months or more, by above-mentioned pre-embedment grouting pipe to basement rock (2) and
Grouting in ground-connecting-wall (3), closing one, the second stage of ground-connecting-wall (3) seam areas, and form closed grout curtain (7) under wall.
8. the implementation method that the closed ground-connecting-wall for protruding into basement rock as claimed in claim 7 encloses well construction, which is characterized in that ground
Even wall (3) inner wall is provided with Horizontal steelwork bracing (5), and Horizontal steelwork bracing (5) is from top to bottom stratified and set on four on ground-connecting-wall (3)
Angle, each layer of Horizontal steelwork bracing (5) You Sigen slip casting steel pipe are constituted, and each slip casting steel-pipe welding is in two adjacent surfaces ground-connecting-wall
(3) on pre-embedded steel slab (42), pre-embedded steel slab (42) is welded on the steel reinforcement cage of ground-connecting-wall (3) by embedded bar (41)；
When enclosing excavation in well, include the following steps: in ground-connecting-wall (3) formation
H, well inner covering layer (1) is enclosed using hand excavation, and layering carries out, and construction personnel enters and leaves and slags tap using gantry crane handling；
I, it excavates gap and prune job face, pump drainage ponding is required according to field test, extraction soil sample；
J, pre-embedded steel slab (42) are cleaned out on ground-connecting-wall (3) inner wall excavated out, Horizontal steelwork bracing (5) is welded and are installed, and
Slip casting is carried out to Horizontal steelwork bracing (5) to enrich, and is enclosed well inner covering layer (1) excavation and is staggeredly carried out with Horizontal steelwork bracing (5) installation；
K, h~j process is recycled, until being excavated to shaft bottom (9), and dewatering well (8) are set in shaft bottom (9).
9. the implementation method that the closed ground-connecting-wall for protruding into basement rock as claimed in claim 6 encloses well construction, it is characterised in that: well
Interface (11) elevation is covered lower than base in bottom (9).
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Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101560767A (en) * | 2009-05-12 | 2009-10-21 | 广东省长大公路工程有限公司 | Method for connecting slotted sections in underground construction of diaphragm wall |
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