CN111980433A - Electrochemical nondestructive repair method for weak structural surface of ancient city wall - Google Patents
Electrochemical nondestructive repair method for weak structural surface of ancient city wall Download PDFInfo
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- CN111980433A CN111980433A CN202010703652.7A CN202010703652A CN111980433A CN 111980433 A CN111980433 A CN 111980433A CN 202010703652 A CN202010703652 A CN 202010703652A CN 111980433 A CN111980433 A CN 111980433A
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- electrode tube
- cathode electrode
- electrochemical
- pipe
- wall
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0203—Arrangements for filling cracks or cavities in building constructions
- E04G23/0211—Arrangements for filling cracks or cavities in building constructions using injection
Abstract
The invention discloses an electrochemical nondestructive repair method for a weak structural surface of an ancient city wall, which comprises the following steps: A. taking off the wall bricks at the top of the city wall on the two sides of the slip crack surface and exposing the rammed soil layer; B. respectively inserting an anode electrode tube and a cathode electrode tube into the ramming soil layer near the slip surface, wherein the anode electrode tube and the cathode electrode tube are respectively connected with a direct-current power supply through leads; C. injecting CaCl into rammed soil layer on one side of slip crack surface through grouting device2Slurry; D. turning on a direct-current power supply to start electroosmosis, feeding water in a ramming soil layer into the cathode electrode tube through the water permeable holes in the wall of the cathode electrode tube, and starting pumping the water in the cathode electrode tube by the water pumping device; E. until continuous calcium salt precipitation is formed between the anode electrode tube and the cathode electrode tube, stopping electroosmosis; F. and moving the anode electrode tube to an extension line of the position connecting line of the original cathode electrode tube and the anode electrode tube, interchanging the anode and cathode interfaces of the power supply, and repeating C to E. And realizing the nondestructive repair of the weak structural surface of the city wall.
Description
Technical Field
The invention relates to an ancient city wall repairing method, in particular to an electrochemical nondestructive repairing method for a weak structural surface of an ancient city wall.
Background
The city wall is a building structure for protecting city pools in ancient times, and is stored as a precious civilization and historic site in modern times. The ancient city wall is actually a rammed earth wall, and a layer of bricks such as Mingchui wall and Xian wall are added outside for protecting rammed earth. Due to the fact that rainwater is accumulated and drainage is not smooth in the long-term of the year, the shear strength of the soil body in the urban wall is reduced, and some weak structural surfaces, such as sliding crack zones and the like, appear, and are shown as obvious outward bulge of the wall body or cracking and peeling of the outer wall. If the restoration is not carried out in time, the unstable soil body completely slides along the weak structure surface, and the unrecoverable damage is caused to the city wall structure.
Disclosure of Invention
The invention aims to provide an electrochemical nondestructive repair method for a weak structural surface of an ancient city wall, which has the advantages of simple equipment and simple and convenient operation and can realize nondestructive repair of the ancient city wall.
The technical purpose of the invention is realized by the following technical scheme:
the invention provides an electrochemical nondestructive repair method for a weak structural surface of an ancient city wall, which comprises the following steps:
an electrochemical nondestructive repair method for a weak structural surface of an ancient city wall comprises the following steps:
A. taking off the wall bricks at the top of the city wall on the two sides of the slip crack surface and exposing the rammed soil layer;
B. respectively inserting an anode electrode tube and a cathode electrode tube into the ramming soil layer near the slip surface, wherein the anode electrode tube and the cathode electrode tube are respectively connected with a direct-current power supply through leads;
C. injecting CaCl into the rammed soil layer close to the anode electrode tube through a grouting device2Slurry;
D. turning on a direct-current power supply to start electroosmosis, allowing pore water in a ramming soil layer to enter a cathode electrode tube through a water permeable hole in the wall of the cathode electrode tube, and starting pumping the pore water in the cathode electrode tube by a water pumping device;
E. until continuous calcium salt precipitation is formed between the anode electrode tube and the cathode electrode tube, stopping electroosmosis;
F. and moving the anode electrode tube to an extension line of the position connecting line of the original cathode electrode tube and the anode electrode tube, interchanging the anode and cathode interfaces of the power supply, and repeating C to E to realize the repair of different elevations and sections.
Furthermore, the grouting device comprises a grouting pipe, a guide pipe, a pressure pump and a slurry container, wherein one end of the grouting pipe is inserted into the ramming layer on one side of the slip fracture surface, the other end of the grouting pipe is connected with the pressure pump through the guide pipe, and the pressure pump is connected with the slurry container through the guide pipe.
Further, the slip casting pipe is a hollow metal pipe, and the shape of the head of the hollow metal pipe is conical.
Furthermore, the diameter of the grouting pipe is 50-100mm, and the thickness of the pipe wall is more than 2 mm.
Furthermore, the anode electrode tube and the cathode electrode tube are hollow metal tubes, and the tube walls of the anode electrode tube and the cathode electrode tube are respectively and longitudinally provided with a plurality of water permeable holes.
Furthermore, the diameters of the anode electrode tube and the cathode electrode tube are 50-70mm, the aperture of the water permeable holes is 5-10mm, and the distance between every two adjacent water permeable holes is 10-20 mm.
Furthermore, the shapes of the heads of the anode electrode tube and the cathode electrode tube are both conical.
Furthermore, the pumping device comprises a pumping pipe and a pumping pump, one end of the pumping pipe is inserted into the cathode electrode pipe, and the other end of the pumping pipe is connected with the pumping pump.
Furthermore, the value of the outer diameter of the water pumping pipe is 5-10mm smaller than that of the inner diameter of the cathode electrode pipe.
Further, the suction pipe is a flexible suction pipe.
The invention has the following beneficial effects:
the equipment required by the method is common equipment, and the construction is simple and convenient; the method avoids the use of large machinery for excavating and secondarily damaging the city wall, and realizes the nondestructive repair of the weak structural surface of the city wall; the electroosmosis process can play a role in accelerating drainage while increasing the strength and integrity of the soil body.
Drawings
FIG. 1 is an electrochemical schematic diagram of an electrochemical nondestructive repair method for a weak structural surface of an ancient city wall, according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram of an electrochemical nondestructive repair method for a weak structural surface of an ancient city wall, according to an embodiment of the present invention;
FIG. 3 is a schematic view of a portion of the structure of FIG. 2;
fig. 4 is a schematic top view of an electrochemical nondestructive repair method for a weak structural surface of an ancient city wall according to an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The invention provides an electrochemical nondestructive repair method for a weak structural surface of an ancient city wall, as shown in figures 2 and 3, the city wall mainly comprises a rammed earth layer 1 and an outer brick-coated wall 2, a slip crack surface 3 exists in the rammed earth layer 1, and the repair of the city wall specifically comprises the following steps:
1) taking off the wall bricks 4 at the top of the city wall on the two sides of the slip crack surface 3 and exposing the rammed soil layer 1;
2) inserting an anode tube 5 into a ramming soil layer 1 near a grouting position (point A in figure 4), inserting a cathode tube 6 into the ramming soil layer at a proper distance A (point B in figure 4), and sequentially connecting the anode tube 5, a direct-current power supply 8 and the cathode tube 6 through a lead 7; the anode electrode tube 5 and the cathode electrode tube 6 are both hollow steel tubes (diameter)
50-75mm), the head is conical, which is convenient for inserting soil, the pipe wall is provided with water permeable holes 15, the aperture is 5-10mm, and the distance is 10-20 mm;
3) inserting a water pumping pipe 9 into the hollow cathode electrode tube 6, connecting the water pumping pipe with a water pumping pump 10, wherein the outer diameter of the water pumping pipe is 5-10mm smaller than the inner diameter of the cathode electrode tube 6 so as to be conveniently inserted, and the water pumping pipe 9 is a flexible water pumping pipe;
4) the grouting pipe 11 is inserted into the soil body near the slip crack surface 3, and the pressure pump 13 and the slurry container 14 are connected in sequence through the conduit 12, and the slurry isCaCl with the concentration of 20-30 percent is filled in the container2The grouting pipe 11 is a hollow steel pipe with the diameter of 50-100mm, the pipe wall thickness is more than 2mm, the head part is conical and is convenient to insert into the soil body, the guide pipe 12 is a flexible guide pipe and is hermetically connected with the grouting pipe 11, and the pressure intensity of the pressure pump 13 can be adjusted according to the depth of the grouting pipe 11 inserted into the soil body;
5) the pressure pump 13 is opened, CaCl is injected into the rammed soil layer 12After the injection of the grout is finished, closing the pressure pump 13 and pulling out the grouting pipe 11;
6) turning on a direct current power supply 8, starting electroosmosis, enabling pore water to enter the tube from a water permeable hole in the wall of the cathode electrode tube 6, simultaneously turning on a water suction pump 10, starting water suction, and discharging the pumped water out of the urban wall;
7) when the water discharge amount is reduced to a certain threshold value, the direct current power supply 8 and the water pump 10 are temporarily closed;
8) repeating the steps 4) to 7) until continuous calcium salt precipitation is formed between the cathode and the anode, and stopping electroosmosis;
9) moving the anode electrode tube to the extension line of the original cathode and anode position connecting line, interchanging the anode and cathode interfaces of the power supply, and continuously repeating the steps 4) to 8) until calcium salt sediment with certain strength is connected with two sides of the soft structural surface, and performing the repairing on different elevations and sections according to the requirements, as shown in fig. 4;
10) and after the restoration, restoring the wall bricks at the top of the city wall to the original state.
As shown in fig. 1, the principle of reinforcing the soil body until continuous calcium salt precipitation is formed between the cathode and the anode is as follows:
after electrification, the pore water with positive charge moves to the cathode, and Ca with positive charge2+Move to the cathode, negatively charged Cl-Moving towards the anode;
under the action of electrolysis, oxidation reaction and reduction reaction respectively occur near the anode and the cathode, and the ion equation of the anode oxidation reaction is as follows:
2Cl--2e-→Cl2↑
the cathode reduction ion equation is:
2H2O+2e-→H2↑+4OH-
CO2 in soil pore gas and Ca (OH) generated by electrolysis2Further reaction to form CaCO3Precipitation, the chemically reactive ion equation is:
Ca2++2OH-+CO2→CaCO3↓+H2O
CaCO3the sediment is insoluble in water, has higher strength and integrity compared with the soil body, and fills the gaps among the soil bodies in the form of sediment in the soil to play a role in reinforcing the soil body.
The parts of the invention not described in detail are all the common general knowledge accepted by the skilled person in the field, and the above description is only one specific embodiment of the invention, and is not intended to limit the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An electrochemical nondestructive repair method for a weak structural surface of an ancient city wall is characterized by comprising the following steps:
A. taking off the wall bricks at the top of the city wall on the two sides of the slip crack surface and exposing the rammed soil layer;
B. respectively inserting an anode electrode tube and a cathode electrode tube into the ramming soil layer near the slip surface, wherein the anode electrode tube and the cathode electrode tube are respectively connected with a direct-current power supply through leads;
C. injecting CaCl into the rammed soil layer close to the anode electrode tube through a grouting device2Slurry;
D. turning on a direct-current power supply to start electroosmosis, allowing pore water in a ramming soil layer to enter a cathode electrode tube through a water permeable hole in the wall of the cathode electrode tube, and starting pumping the pore water in the cathode electrode tube by a water pumping device;
E. until continuous calcium salt precipitation is formed between the anode electrode tube and the cathode electrode tube, stopping electroosmosis;
F. and moving the anode electrode tube to an extension line of the position connecting line of the original cathode electrode tube and the anode electrode tube, interchanging the anode and cathode interfaces of the power supply, and repeating C to E to realize the repair of different elevations and sections.
2. The electrochemical nondestructive repair method for the weak structural surface of the ancient city wall according to claim 1, wherein the grouting device comprises a grouting pipe, a conduit, a pressure pump and a slurry container, one end of the grouting pipe is inserted into a ramming layer on one side of the slip fracture surface, the other end of the grouting pipe is connected with the pressure pump through the conduit, and the pressure pump is connected with the slurry container through the conduit.
3. The electrochemical nondestructive repair method for the weak structural surface of the ancient city wall as claimed in claim 2, wherein the grouting pipe is a hollow metal pipe, and the head of the hollow metal pipe is tapered.
4. The electrochemical nondestructive repair method for the ancient city wall weak structural surface according to claim 2 or 3, wherein the diameter of the grouting pipe is 50-100mm, and the thickness of the pipe wall is more than 2 mm.
5. The electrochemical nondestructive repair method for the weak structural surface of the ancient city wall according to claim 1, wherein the anode electrode tube and the cathode electrode tube are hollow metal tubes, and a plurality of water permeable holes are respectively and longitudinally formed in the tube walls of the anode electrode tube and the cathode electrode tube.
6. The electrochemical nondestructive repair method for the ancient city wall weak structural surface according to claim 5, wherein the diameters of the anode electrode tube and the cathode electrode tube are 50-70mm, the pore diameter of the water permeable hole is 5-10mm, and the distance between adjacent water permeable holes is 10-20 mm.
7. The electrochemical nondestructive repair method for the ancient city wall weak structural surface according to claim 1, wherein the shapes of the heads of the anode electrode tube and the cathode electrode tube are both conical.
8. The electrochemical nondestructive repair method for the weak structural surface of the ancient city wall as claimed in claim 1, wherein the water pumping device comprises a water pumping pipe and a water pump, one end of the water pumping pipe is inserted into the cathode electrode pipe, and the other end of the water pumping pipe is connected with the water pump.
9. The electrochemical nondestructive repair method for the ancient city wall weak structural surface according to claim 8, wherein the value of the outer diameter of the water pumping pipe is 5-10mm smaller than the value of the inner diameter of the cathode electrode pipe.
10. The electrochemical nondestructive repair method for the weak structural surface of the ancient city wall as claimed in claim 8 or 9, wherein the water pumping pipe is a flexible water pumping pipe.
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| CN202010703652.7A CN111980433A (en) | 2020-07-21 | 2020-07-21 | Electrochemical nondestructive repair method for weak structural surface of ancient city wall |
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Citations (9)
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|---|---|---|---|---|
| JP2000096594A (en) * | 1998-09-22 | 2000-04-04 | Nippon Sogo Bosui Kk | Water leakage repair method for structure and water leakage repair material injecting device |
| CN103485808A (en) * | 2013-10-12 | 2014-01-01 | 山东科技大学 | Electro-osmosis home position modified roadway anchoring method of underground swelling soft rock |
| CN105696544A (en) * | 2016-01-22 | 2016-06-22 | 浙江大学宁波理工学院 | Remote monitoring control device for reclaimed silt soil reinforcement through electro-osmosis |
| CN106284292A (en) * | 2015-06-09 | 2017-01-04 | 江苏德盈土工材料有限公司 | A kind of consolidating mud soil electrochemical modification hardened system |
| CN106894531A (en) * | 2016-12-23 | 2017-06-27 | 温州大学 | Light current drainage by electroosmosis ruling by law reason buildings leakage device and the method for administering leak |
| CN108560944A (en) * | 2018-05-03 | 2018-09-21 | 东南大学 | A kind of ruggedized construction and its construction method for reinforcing Old City Wall globality |
| CN109972608A (en) * | 2019-05-06 | 2019-07-05 | 广东水电二局股份有限公司 | A kind of combined type soft base drain consolidation system and method |
| CN110512892A (en) * | 2019-08-30 | 2019-11-29 | 山西五建集团有限公司 | Existing old wall renovation and construction method |
| CN111364485A (en) * | 2020-02-11 | 2020-07-03 | 中国矿业大学 | Method for electrochemically reinforcing strip mine slope forward-inclination soft interlayer |
-
2020
- 2020-07-21 CN CN202010703652.7A patent/CN111980433A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000096594A (en) * | 1998-09-22 | 2000-04-04 | Nippon Sogo Bosui Kk | Water leakage repair method for structure and water leakage repair material injecting device |
| CN103485808A (en) * | 2013-10-12 | 2014-01-01 | 山东科技大学 | Electro-osmosis home position modified roadway anchoring method of underground swelling soft rock |
| CN106284292A (en) * | 2015-06-09 | 2017-01-04 | 江苏德盈土工材料有限公司 | A kind of consolidating mud soil electrochemical modification hardened system |
| CN105696544A (en) * | 2016-01-22 | 2016-06-22 | 浙江大学宁波理工学院 | Remote monitoring control device for reclaimed silt soil reinforcement through electro-osmosis |
| CN106894531A (en) * | 2016-12-23 | 2017-06-27 | 温州大学 | Light current drainage by electroosmosis ruling by law reason buildings leakage device and the method for administering leak |
| CN108560944A (en) * | 2018-05-03 | 2018-09-21 | 东南大学 | A kind of ruggedized construction and its construction method for reinforcing Old City Wall globality |
| CN109972608A (en) * | 2019-05-06 | 2019-07-05 | 广东水电二局股份有限公司 | A kind of combined type soft base drain consolidation system and method |
| CN110512892A (en) * | 2019-08-30 | 2019-11-29 | 山西五建集团有限公司 | Existing old wall renovation and construction method |
| CN111364485A (en) * | 2020-02-11 | 2020-07-03 | 中国矿业大学 | Method for electrochemically reinforcing strip mine slope forward-inclination soft interlayer |
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Application publication date: 20201124 |
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