CN211816279U - New and old ground is wall interface processing structure even - Google Patents
New and old ground is wall interface processing structure even Download PDFInfo
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- CN211816279U CN211816279U CN202020121647.0U CN202020121647U CN211816279U CN 211816279 U CN211816279 U CN 211816279U CN 202020121647 U CN202020121647 U CN 202020121647U CN 211816279 U CN211816279 U CN 211816279U
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Abstract
The utility model discloses a new and old ground is wall interface processing structure even, including extension section underground continuous wall, relate to the foundation ditch engineering field. The underground continuous wall comprises an elongated underground continuous wall, a new underground continuous wall and an old underground continuous wall; one end of the extension section underground continuous wall is connected with the new underground continuous wall, the other end of the extension section underground continuous wall is in contact with the old underground continuous wall, and a plurality of grouting pipes are arranged at the contact positions of the extension section underground continuous wall and the old underground continuous wall. The utility model discloses a newly-built one section extension underground diaphragm wall near new and old underground diaphragm wall seam to add the slip casting pipe in seam crossing, carry out the foundation ditch excavation again after the slip casting, through the reinforcement of seepage passageway and slip casting around what artificially prolong, thereby reach and improve seam stagnant water effect, ensure foundation ditch excavation construction safety.
Description
Technical Field
The utility model relates to a foundation ditch engineering field, it is a new and old ground is wall interface processing structure even that says so more specifically.
Background
According to technical code of building foundation pit support JGJ120-2012, the definition of the foundation pit support is as follows: in order to protect the safety of the construction of the underground main body structure and the surrounding environment of the foundation pit, the foundation pit adopts the measures of temporary retaining, reinforcing, protecting and underground water controlling. Whether a supporting structure is adopted for foundation pit excavation or not, which supporting structure is adopted, and the comprehensive analysis and comparison of economy, technology and environment are determined according to the surrounding environment of the foundation pit, the excavation depth of the foundation pit, engineering geological and hydrogeological conditions, construction seasons, regional engineering experience and the like. In foundation pit engineering with high underground water level, poor stratum conditions and large excavation depth, supporting structures such as cast-in-situ bored piles, underground continuous walls, occlusive cast-in-situ piles and the like are mostly adopted.
The underground continuous wall is a commonly used supporting structure in foundation pit engineering, under the condition of slurry wall protection, a long and narrow deep groove is dug on the ground, a reinforcement cage is hung after the groove is cleaned, underwater concrete is poured by using a conduit method to form a unit groove section, and the steps are carried out section by section in this way, and a continuous reinforced concrete wall is built underground.
And water-stopping weak belts are formed at the joints of the underwater concrete poured among the unit groove sections in sequence, and various water-stopping structures such as a locking port pipe and I-shaped steel can be adopted to improve the water-stopping effect at the joints. Before the first-stage groove section is poured with concrete, after a fore shaft pipe or a joint box is arranged, the first-stage groove section concrete is poured; before the concrete is poured in the second-stage groove section, the fore shaft pipe or the joint box is pulled out, and then the concrete in the second-stage groove section is poured, so that an artificially extended seepage channel is formed between the concrete in the second-stage groove section and the concrete in the first-stage groove section, and the requirement of water stop is met.
The above various underground continuous wall joint water stop structures are suitable for newly built structures which are synchronously started, the lengths and the joint arrangement of the groove sections are determined before the construction of the underground continuous walls of the first-stage groove section and the second-stage groove section, and the interval time before and after the construction is short, so that the joint treatment effect is good.
With the rapid development of urban underground engineering construction, various underground foundation pit engineering is increasing. The newly-built foundation pit engineering is more and more obvious under the restriction factors of the surrounding environment, and more cases are built by clinging to the original underground foundation pit engineering. In addition, in the rail transit engineering, a main engineering is generally started firstly, and subsidiary engineering (such as a wind pavilion, an entrance and an exit) is started after being limited by the surrounding environment, the plane arrangement scheme of the subsidiary engineering is uncertain, and the subsidiary engineering is connected with the main engineering. Therefore, when the geological environment of the underground engineering is high in underground water level and poor in stratum conditions, the underground continuous walls are mostly adopted for the foundation pit supporting structure, but due to various factors, the underground continuous walls cannot be reserved with interfaces on the subsequent underground continuous walls, so that seams between new and old underground continuous walls must be processed, otherwise water and sand leakage is easy to occur during foundation pit excavation, and the safety of various surrounding building structures and the safety of the foundation pit are endangered.
Aiming at the joint treatment of new and old underground continuous walls, currently, grouting or high-pressure jet grouting piles are generally adopted to reinforce soil bodies on the soil-facing side of the joints of foundation pits, and the method has the disadvantages that the ground operation conditions are possibly limited by peripheral pipelines, the soil body reinforcement quality is not easy to control, the investment cost is high and the like.
Therefore, a new and old underground diaphragm wall interface processing structure is developed and used for processing the joint seam between the new and old underground diaphragm walls when the excavation depth of the foundation pit engineering is large, the stratum condition is poor and the underground water level is high.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the shortcomings of the background art and providing a new and old ground is wall interface processing structure even.
In order to realize the purpose, the technical scheme of the utility model is that:
new and old ground is wall interface processing structure even, its characterized in that: comprises an extension section underground continuous wall, a new underground continuous wall and an old underground continuous wall; one end of the lengthened underground continuous wall is connected with the new underground continuous wall, the other end of the lengthened underground continuous wall is in contact with the old underground continuous wall, and a plurality of grouting pipes are arranged at the contact positions of the lengthened underground continuous wall and the old underground continuous wall; and filling a gap between the new underground continuous wall and the old underground continuous wall and a gap between the lengthened underground continuous wall and the old underground continuous wall by grouting the grouting pipe.
In the technical scheme, the new underground continuous wall comprises a first-stage groove section and a second-stage groove section, and a joint water stopping device is arranged between the first-stage groove section and the second-stage groove section; the extension section underground continuous wall is connected with the first-stage groove section.
In the above technical solution, the planar arrangement distance between the grouting pipes is 0.5-0.8 m.
In the technical scheme, the grouting holes of the grouting pipes are arranged in a quincunx shape, the aperture of each grouting hole is 10mm, and the hole distance is 20-30 cm; the length of the non-drilled holes at the upper end and the lower end of the grouting pipe is 0.5-1.5m and is used as a grout stopping section.
In the technical scheme, the plane form of the lengthened underground continuous wall and the new underground continuous wall is L-shaped or Z-shaped, and the length of the lap joint section of the lengthened underground continuous wall and the new underground continuous wall is 2-3 m.
In the technical scheme, the depth of the lengthened underground continuous wall, the depth of the grouting pipe and the depth of the first-stage groove section are consistent.
The utility model discloses a newly-built one section extension underground diaphragm wall near new and old underground diaphragm wall seam to add the slip casting pipe in seam crossing, carry out the foundation ditch excavation again after the slip casting, through the reinforcement of seepage passageway and slip casting around what artificially prolong, thereby reach and improve seam stagnant water effect, ensure foundation ditch excavation construction safety.
Drawings
Fig. 1 is a schematic structural diagram 1 of the present invention.
Fig. 2 is a schematic structural diagram 2 of the present invention.
Fig. 3 is a schematic structural view of the joint water stop device of the present invention when it is a joint pipe.
Fig. 4 is a schematic structural view of the seam water stopping device of the present invention when it is made of i-steel.
The foundation pit structure comprises 1-an elongated section of underground continuous wall, 2-a new underground continuous wall, 21-a first-stage groove section, 22-a second-stage groove section, 23-a joint water stop device, 3-an old underground continuous wall, 41-an auxiliary foundation pit and 42-a main foundation pit.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings, which are not intended to limit the present invention, but are merely exemplary. While the advantages of the invention will be apparent and readily appreciated by the description.
With reference to the accompanying drawings: new and old ground is wall interface processing structure even, its characterized in that: comprises an extension underground continuous wall 1, a new underground continuous wall 2 and an old underground continuous wall 3; one end of the lengthened underground continuous wall 1 is connected with the new underground continuous wall 2, the other end of the lengthened underground continuous wall is in contact with the old underground continuous wall 3, and a plurality of grouting pipes 11 are arranged at the contact positions of the lengthened underground continuous wall 1 and the old underground continuous wall 3; and (3) filling a gap between the new underground continuous wall 2 and the old underground continuous wall 3 and a gap between the lengthened underground continuous wall 1 and the old underground continuous wall 3 by grouting the grouting pipe 11.
The new underground continuous wall 2 comprises a first-stage groove section 21 and a second-stage groove section 21, and a joint water stopping device 23 is arranged between the first-stage groove section 21 and the second-stage groove section 21; the extension underground continuous wall 1 is connected with a primary trough section 21.
The planar arrangement distance between the grouting pipes 11 is 0.5-0.8 m.
The grouting holes of the grouting pipes 11 are arranged in a quincunx shape, the aperture of each grouting hole is 10mm, and the hole distance is 20-30 cm; the length of the non-drilling holes at the upper end and the lower end of the grouting pipe 11 is 0.5-1.5m and is used as a grout stopping section.
The plane forms of the lengthened underground continuous wall 1 and the new underground continuous wall 2 are L-shaped or Z-shaped, and the specific plane form can be adjusted in time according to the plane arrangement of the main foundation pit 42; the length of the overlapped section of the lengthened underground continuous wall 1 and the new underground continuous wall 2 is 2-3 m.
The depth of the lengthened underground continuous wall 1, the grouting pipe 11 and the first-stage groove section 21 is consistent, and the specific depth requirement is determined according to the requirement of the auxiliary foundation pit 41.
The method for processing the new and old ground wall connection interface is characterized by comprising the following steps of:
step 1: after the plurality of grouting pipes 11 are processed, the grouting pipes are firmly bound with the reinforcement cage of the lengthened underground continuous wall 1, and the grouting pipes are numbered in sections after being accepted;
and 4, step 4: and after grouting, performing pressure hole sealing on the grouting hole of the grouting pipe 11 through cement slurry.
In actual use, the grooving technical parameters of the lengthened underground continuous wall 1 are as follows:
1) in the excavation process of the groove section close to the main foundation pit 42 (original foundation pit), the groove is always filled with slurry to keep the groove wall stable;
2) the stability of the groove section excavation is enhanced, if the groove wall is seriously locally collapsed, the groove section excavation is backfilled in time and properly processed;
3) during construction, slurry leakage should be timely supplemented, and the required liquid level height is always kept. The quality of the slurry is checked regularly, and the index of the slurry is adjusted in time;
4) after the groove section is excavated, the groove position, the groove depth, the groove width and the groove wall verticality are checked, and the groove cleaning and slurry changing work can be carried out after the groove section is qualified;
5) the control of the final groove depth of the groove section meets the following requirements: a. the final groove depth of the groove section must ensure the design depth, and in the same groove section, the excavation depth of the groove bottom is consistent and kept flat; b. the excavation depth of the groove bottom of the underground continuous wall 1 of the extension section in the same groove section is consistent with that of the groove bottom of the first-stage groove section 21;
6) the length, thickness, inclination, etc. of the groove sections should meet the following requirements: a. the allowable deviation of the length of the groove section is +/-2.0 percent; b. the allowable deviation of the thickness of the groove section is +/-10 mm; c. the allowable deviation of the perpendicularity of the groove section is +/-1/300; d. the local projection of the wall surface is not more than 100 mm; e. the position deviation of the embedded part on the wall surface is not more than 100 mm; f. deviation of the center line of the wall top: less than or equal to 30 mm; g. the areas of the holes, exposed ribs and honeycombs are not more than 5% of the exposed area of the unit groove section; h. the joint of the groove sections has no mud inclusion and no water leakage;
7) and cleaning impurities such as sediments at the bottom of the tank after the tank digging is finished, wherein the specific gravity of the slurry within 500mm of the bottom of the tank is not more than 1.15 and the thickness of the sediments is not more than 100mm after the tank bottom is cleaned and the slurry is replaced for 1 hour.
Technical parameters of grouting pipe 11
1) The grouting pipe 11 adopts
42 sleeve valve pipes, wherein the grouting liquid is cement liquid, the proportion of the cement liquid is 0.5:1, and the grade of the cement is not lower than 42.5;
2) the grouting pressure is 0.15-0.2 MPa;
3) the grouting pipe 11 is extended into the bottom of the hole, and the grouting section can be 0.3-0.5m according to different stratums;
4) the diffusion radius of the slurry is determined according to a field grouting test, but is not less than 250 mm;
5) when satisfied withGrouting may be terminated at one of the following conditions: a. grouting amount (0.5 m per linear meter)3) And the grouting pressure (0.2MPa) meet the design requirements; b. the grouting amount reaches 75% of the design value, and the grouting pressure exceeds the design value;
6) and after grouting, adopting cement slurry with the ratio of 0.5:1 to seal the grouting holes under pressure.
Other parts not described belong to the prior art.
Claims (6)
1. New and old ground is wall interface processing structure even, its characterized in that: comprises an extension underground continuous wall (1), a new underground continuous wall (2) and an old underground continuous wall (3); one end of the lengthened underground continuous wall (1) is connected with the new underground continuous wall (2), the other end of the lengthened underground continuous wall is contacted with the old underground continuous wall (3), and a plurality of grouting pipes (11) are arranged at the contact part of the lengthened underground continuous wall (1) and the old underground continuous wall (3); and filling a gap between the new underground continuous wall (2) and the old underground continuous wall (3) and a gap between the lengthened underground continuous wall (1) and the old underground continuous wall (3) by grouting the grouting pipe (11).
2. The structure of claim 1, wherein: the new underground continuous wall (2) comprises a first-stage groove section (21) and a second-stage groove section (22), and a joint water stopping device (23) is arranged between the first-stage groove section (21) and the second-stage groove section (22); the lengthened underground continuous wall (1) is connected with the first-stage groove section (21).
3. The new and old groundwall interface processing architecture according to claim 1 or 2, wherein: the plane arrangement distance between the grouting pipes (11) is 0.5-0.8 m.
4. The structure of claim 3, wherein: the grouting holes of the grouting pipes (11) are arranged in a quincunx shape, the aperture of each grouting hole is 10mm, and the hole distance is 20-30 cm; the length of the upper end and the lower end of the grouting pipe (11) without drilling is 0.5-1.5m, and the grouting pipe is used as a grout stopping section.
5. The structure of claim 4, wherein: the plane form of the lengthened underground continuous wall (1) and the new underground continuous wall (2) is L-shaped or Z-shaped, and the length of the overlapped section of the lengthened underground continuous wall (1) and the new underground continuous wall (2) is 2-3 m.
6. The structure of claim 5, wherein: the depth of the extension section underground continuous wall (1), the depth of the grouting pipe (11) and the depth of the first-stage groove section (21) are consistent.
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| CN202020121647.0U CN211816279U (en) | 2020-01-19 | 2020-01-19 | New and old ground is wall interface processing structure even |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111088802A (en) * | 2020-01-19 | 2020-05-01 | 长江勘测规划设计研究有限责任公司 | New and old ground wall interface processing structure and processing method thereof |
| CN114232668A (en) * | 2021-11-30 | 2022-03-25 | 中交路桥华南工程有限公司 | Water sealing structure for anchorage support |
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2020
- 2020-01-19 CN CN202020121647.0U patent/CN211816279U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111088802A (en) * | 2020-01-19 | 2020-05-01 | 长江勘测规划设计研究有限责任公司 | New and old ground wall interface processing structure and processing method thereof |
| CN111088802B (en) * | 2020-01-19 | 2024-05-24 | 长江勘测规划设计研究有限责任公司 | New and old ground wall connection interface processing structure and processing method thereof |
| CN114232668A (en) * | 2021-11-30 | 2022-03-25 | 中交路桥华南工程有限公司 | Water sealing structure for anchorage support |
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