Semi-cutting construction method for diaphragm wall

Abstract

The invention relates to an underground diaphragm wall half-cutting construction method which is used for cutting a local wall body on the inner side of an enclosure type underground diaphragm wall and comprises the following steps: S1, forming a grouting hole c in a set position on the outer side of the underground diaphragm wall, and grouting into a soil body on the outer side of the underground diaphragm wall through the grouting hole c to reinforce the soil body; s2, transverse continuous drilling is conducted on the bottom, corresponding to the to-be-cut local wall body, of the inner side of the diaphragm wall through a water drill, and a layer hole groove e with the depth equal to the thickness of the to-be-cut local wall body is formed; s3, longitudinal continuous drilling is conducted on the two sides, corresponding to the local wall to be cut, of the top of the diaphragm wall through a water drill; according to the method, the soil body on the outer side of the diaphragm wall in the to-be-cut area is reinforced in an alternate grouting mode, and during local cutting operation of the diaphragm wall in the cut area, the soil body on the outer side of the diaphragm wall cannot generate large pressure on the diaphragm wall, so that the supporting stability of the wall body before and after semi-cutting operation of the diaphragm wall is improved, and the service life of the diaphragm wall is prolonged. And the safety of the semi-cutting operation of the diaphragm wall is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, in particular to a half-cutting construction method of a ground-connected wall. Background Art

[0002] "Two walls in one" is a form of retaining structure that integrates the retaining, water-stopping and anti-seepage functions of the ground-connected wall and the outer wall of the basement structure. The ground-connected wall encloses the outside of the basement structure. With the increasing number of deep foundation pit projects, its application is becoming more and more extensive. In fact, with the increase in the demand for the area of ​​functional rooms in the basement, it is necessary to cut the ground-connected wall to a certain depth and thickness without affecting the blocking effect of the ground-connected wall itself, which is a "half-cut" form, to meet the demand for the area of ​​functional rooms in the basement.

[0003] Conventional continuous wall cutting methods include manual jackhammers and speculative demolition, which are very destructive to the ground-connected wall itself. Since the thickness of the ground-connected wall is reduced and its lateral compressive resistance is weakened after partial cutting, it is impossible to use the more destructive traditional cutting methods to carry out "half-cutting" construction of the ground-connected wall, which poses a great safety hazard in construction. Therefore, how to design a ground-connected wall half-cutting construction method to ensure construction safety while carrying out the ground-connected wall half-cutting construction has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art, provide a ground-connected wall half-cutting construction method, and solve the problem that the conventional continuous wall cutting form in the prior art cannot perform ground-connected wall half-cutting while ensuring safety.

[0005] To achieve the above object, the present invention provides a ground-connected wall half-cutting construction method, which is used for cutting a local wall inside an enclosing ground-connected wall, and comprises the following steps:

[0006] S1. Open grouting holes at set positions outside the ground-connected wall, and inject grouting into the soil outside the ground-connected wall through the grouting holes to reinforce the soil;

[0007] S2. Use a water drill to continuously drill holes horizontally on the inner side of the ground-connected wall corresponding to the bottom of the local wall to be cut, so as to form a layer of hole grooves with a depth equal to the thickness of the local wall to be cut;

[0008] S3, using a water drill to drill holes longitudinally and continuously on both sides of the top of the ground-connected wall corresponding to the local wall to be cut, to form two rows of hole grooves that are interconnected with the bottom and the inside of the layer hole groove;

[0009] S4, using a rope saw, the rope body of the rope saw is arranged from the inner side of the ground connection wall to the outer side inside the layer hole groove and the two row hole grooves and close to the bottom of the groove, and then the rope saw is started to perform longitudinal cutting of the ground connection wall between the layer hole groove and the two row hole grooves;

[0010] S5. The partial wall formed by cutting falls on the inner side of the ground-connected wall. After cleaning, the half-cutting operation of the ground-connected wall is completed.

[0011] By adopting this technical solution, before the half-cutting operation of the ground-anchored wall is carried out, grouting holes are opened on the outside of the ground-anchored wall and grouting is carried out to reinforce the soil outside the ground-anchored wall in the area to be cut. When the ground-anchored wall in the cutting area is partially cut subsequently, the soil outside the ground-anchored wall will not exert great pressure on the ground-anchored wall, thereby increasing the supporting stability of the wall before and after the half-cutting operation of the ground-anchored wall and ensuring the safety of the half-cutting operation of the ground-anchored wall. The three-sided cutting of the partial wall to be cut is directly completed by horizontal and vertical drilling, and at the same time, a space is provided for the layout of the rope saw. The partial wall to be cut can be directly cut on the ground-anchored wall in one operation with the rope saw, and the strength of the remaining ground-anchored wall will not be damaged, which effectively solves the construction problem of half-cutting of the ground-anchored wall under complex conditions.

[0012] Furthermore, step S1 of opening grouting holes is specifically as follows: a number of opening points are evenly set in a direction parallel to the length of the ground-connected wall within the range of the local wall to be cut on the outside of the ground-connected wall, and then a drilling machine is used to drill holes according to the opening points. The depth of the drilling should be greater than the height of the local wall to be cut.

[0013] By adopting this technical solution, grouting holes are evenly distributed at set positions to increase the uniformity of subsequent grouting inside the soil outside the ground-anchored wall, and the depth of the drilling holes is increased to ensure the reinforcement strength of the soil outside the ground-anchored wall in the area where the local wall to be cut is located, so as to avoid excessive pressure on the soil outside the ground-anchored wall affecting the ground-anchored wall to be cut and after cutting.

[0014] Furthermore, the grouting reinforcement of the soil in step S1 specifically includes: using a grouting machine to alternately grout ordinary Portland cement and water glass into the grouting hole, and the grouting pressure should not exceed 0.5 MPa.

[0015] By adopting this technical solution, ordinary Portland cement and water glass are used for alternating grouting. While the two can reinforce the soil individually, they can react with each other to enhance the strength and durability of the slurry consolidation, thereby increasing the efficiency and strength of the reinforced soil and avoiding the soil from exerting too much pressure on the ground-anchored wall, thereby ensuring the safety of the half-cutting of the ground-anchored wall and the stability of the ground-anchored wall's own support; limiting the grouting pressure to below 0.5MPa can avoid the problem of the grouting speed being too fast to penetrate into the soil, and at the same time, when there are pipes inside the soil, it can avoid the problem of excessive pressure on the pipes inside the soil, causing them to be damaged.

[0016] Furthermore, step S2 includes setting two boundary lines on the inner side of the ground-connected wall according to the width of the local wall to be cut, and using a water drill to perform horizontal continuous drilling starting from any side boundary line until drilling reaches the other side boundary line, thereby forming a horizontal layer hole groove.

[0017] By adopting this technical solution, a boundary line is set to limit the range of drilling, avoiding the problem of excessive drilling width affecting the structural strength of the corresponding position of the ground-connected wall, while ensuring that the continuous drilling of the horizontal line can complete the cutting operation at the bottom of the local wall to be cut at the same time.

[0018] Furthermore, step S3 includes setting two boundary lines at the top of the ground-connected wall according to the width of the local wall to be cut, and using a water drill to drill holes longitudinally and continuously along the boundary lines to form two longitudinal row hole grooves.

[0019] By adopting this technical solution, a boundary line is set to limit the scope of drilling, avoiding the problem of lower structural strength of the corresponding position of the ground-connected wall due to drilling deviation, while ensuring that the longitudinal continuous drilling can complete the cutting operations on both sides of the local wall to be cut at the same time.

[0020] Furthermore, when executing step S4, the rope saw is moved so that its rope body falls into the layer hole groove and the two row hole grooves until the rope body fits with the corresponding groove bottom and stops, and the position of the rope saw is fixed, and then the rope saw is started to cut the ground connecting wall between the layer hole groove and the two row hole grooves upward.

[0021] By adopting this technical solution, when the rope saw is installed, the rope body can fall directly into the layer hole groove and the two row hole grooves, reducing the difficulty of using the rope saw for cutting the ground-connected wall, and can thereby increase the accuracy of the rope body's operating position, thereby ensuring the cutting accuracy of the surface to be cut.

[0022] Furthermore, step S5 includes setting a support body on the inner side of the ground-connected wall for supporting the local wall to be cut.

[0023] By adopting this technical solution, a support body is provided to support the partial wall to be cut, thereby preventing the cut partial wall from directly falling to the inner side of the ground-connected wall to cause a safety accident, thereby increasing the safety of the operation.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. Alternate grouting is used to reinforce the soil outside the ground-connected wall in the area to be cut. When the ground-connected wall in the cutting area is partially removed, the soil outside the ground-connected wall will not exert a large pressure on the ground-connected wall, thereby increasing the support stability of the wall before and after the half-cutting operation of the ground-connected wall and ensuring the safety of the half-cutting operation of the ground-connected wall.

[0026] 2. Before the half-cutting operation of the ground-anchored wall, grouting holes are opened on the outside of the ground-anchored wall and grouting is carried out to reinforce the soil outside the ground-anchored wall in the area to be cut. When the ground-anchored wall in the cutting area is subsequently partially removed, the soil outside the ground-anchored wall will not exert a large pressure on the ground-anchored wall, thereby increasing the supporting stability of the wall before and after the half-cutting operation of the ground-anchored wall and ensuring the safety of the half-cutting operation of the ground-anchored wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the construction process of the half-cutting construction method of the ground-connected wall of the present invention; Figure 2 This is a schematic diagram of the distribution of grouting holes in the half-cut construction method of the ground-connected wall of the present invention;

[0028] Figure 3 A schematic diagram of the middle-layer hole slot opening in the half-cut construction method of the ground-connected wall of the present invention;

[0029] Figure 4 A schematic diagram of the hole slots in the half-cut construction method of the ground-connected wall of the present invention;

[0030] Figure 5 It is a schematic diagram of the connection between the middle-layer hole groove and the row hole groove in the half-cut construction method of the ground-connected wall of the present invention;

[0031] Figure 6 It is a schematic diagram of multi-layer hole slot opening in the half-cutting construction method of the ground-connected wall of the present invention;

[0032] Figure 7 It is a schematic diagram of the connection between multiple layers of holes and multiple rows of holes in the half-cut construction method of the ground-connected wall of the present invention.

[0033] Description of reference numerals:

[0034] a. Ground-connected wall; b. Partial wall to be cut; c. Grouting hole; d. Hole arrangement groove; e. Layer hole groove. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0036] Please refer to Figure 1-5The present invention provides a construction method for half-cutting a ground-connected wall, which is used for cutting a local wall inside a protective ground-connected wall a, and comprises the following steps: S1, opening a grouting hole c at a set position outside the ground-connected wall a, and injecting grout into the soil outside the ground-connected wall a through the grouting hole c to reinforce the soil; S2, using a water drill to perform horizontal continuous drilling at the bottom of the local wall b to be cut inside the ground-connected wall a, to form a layer of hole grooves e with a depth equal to the thickness of the local wall b to be cut; S3, drilling holes at the top of the ground-connected wall a to form a hole groove e with a depth equal to the thickness of the local wall b to be cut; S4, drilling holes at the top of the ground-connected wall a to form a hole groove e with a depth equal to the thickness of the local wall b to be cut; S5, drilling holes at the top of the ground-connected wall a to form a hole groove e with a depth equal to the thickness of the local wall b to be cut; S6, drilling holes at the top of the ground-connected wall a to form a hole groove e with a depth equal to the thickness of the local wall b to be cut; S7, drilling holes at the top of the ground-connected wall a to form a hole groove e with a depth equal to the thickness of the local wall b to be cut; S8, drilling holes at the bottom of the ground-connected wall a to form a hole groove e with a depth equal to the thickness of the local wall b to be cut; S9, drilling holes at the top of the ground-connected wall a to form a hole groove e with a depth equal to the thickness of the local wall b to be cut; S10, drilling holes at the bottom of the ground-connected wall a to form a hole groove e with a depth equal to the thickness of the local wall b to be cut; S11, drilling holes at the top of the ground-connected wall a to form a hole groove e with a depth equal to the thickness of the local wall b to be cut; S12, drilling holes at the bottom of the ground- Use a water drill to drill holes longitudinally and continuously on both sides of the local wall b to be cut, so as to form two rows of hole grooves d that are interconnected with the bottom and the inside of the layer hole groove e; S4, use a rope saw, and arrange the rope body of the rope saw from the inside of the ground-connected wall a to the outside, inside the layer hole groove e and the two rows of hole grooves d and close to the bottom of the groove, and then start the rope saw to perform longitudinal cutting of the ground-connected wall a between the layer hole groove e and the two rows of hole grooves d; S5, the local wall formed by cutting falls on the inside of the ground-connected wall a, and the half-cutting operation of the ground-connected wall a is completed after cleaning;

[0037] Before the half-cutting operation of the ground-connected wall a is carried out, a grouting hole c is opened on the outside of the ground-connected wall a and grouting is carried out to reinforce the soil outside the ground-connected wall a in the area to be cut. When the ground-connected wall a in the cutting area is partially cut laterally, the soil outside the ground-connected wall a will not exert a large pressure on the ground-connected wall a, thereby increasing the support stability of the wall before and after the half-cutting operation of the ground-connected wall a and ensuring the safety of the half-cutting operation of the ground-connected wall a. The three-sided cutting of the local wall b to be cut is directly completed by horizontal and vertical drilling, and at the same time, a space is provided for the layout of the rope saw. The local wall b to be cut can be directly cut on the ground-connected wall a in one operation with the rope saw, and the strength of the remaining ground-connected wall a will not be damaged, which effectively solves the construction problem of half-cutting the ground-connected wall a under complex conditions.

[0038] Please refer to the attached Figure 2 , step S1 of opening grouting holes c specifically comprises: evenly setting a number of opening points on the outside of the ground-connected wall a corresponding to the local wall b to be cut along the length direction parallel to the ground-connected wall a, and then using a drilling machine to drill holes according to the opening points, and the depth of the drilling should be greater than the height of the local wall b to be cut; evenly opening grouting holes c at set positions to increase the uniformity of subsequent grouting inside the soil outside the ground-connected wall a, and increasing the depth of the drilling holes to ensure the reinforcement strength of the soil outside the ground-connected wall a in the area where the local wall b to be cut is located, so as to avoid excessive pressure on the soil outside the ground-connected wall a affecting the ground-connected wall a to be cut and after cutting.

[0039] The grouting reinforcement of the soil in step S1 is specifically as follows: using a grouting machine to alternately grout ordinary Portland cement and water glass into the grouting hole c, and the grouting pressure should not exceed 0.5MPa; using ordinary Portland cement and water glass for alternate grouting, both of which can reinforce the soil individually and react with each other to enhance the strength and durability of the slurry consolidation, thereby increasing the efficiency and strength of the reinforced soil, avoiding the soil from exerting a large pressure on the ground-connected wall a, to ensure the safety of the half-cutting of the ground-connected wall a and the stability of the ground-connected wall a's own support; limiting the grouting pressure to below 0.5MPa can avoid the problem of the grouting speed being too fast to penetrate into the soil, and at the same time, when there are pipes inside the soil, it can avoid the problem of excessive pressure on the pipes inside the soil, causing damage to them.

[0040] Furthermore, in order to prevent slurry from overflowing after grouting, the grouting hole c should be sealed with grouting liquid or cement mortar after the grouting is completed.

[0041] Please refer to the attached Figure 3 Step S2 includes setting two boundary lines on the inner side of the ground-connected wall a according to the width of the local wall b to be cut, using a water drill to start horizontal continuous drilling from any side boundary line, and stop when drilling to the other side boundary line, forming a horizontal layer hole groove e; setting boundary lines to limit the range of drilling, avoiding the problem of excessive drilling width affecting the structural strength of the corresponding position of the ground-connected wall a, and ensuring that the horizontal line continuous drilling can complete the cutting operation of the bottom end of the local wall b to be cut at the same time.

[0042] For further information, please refer to the attached Figure 6 In order to adapt to the cutting operation of the local wall b to be cut with a larger height, several layers of holes and grooves e can be evenly distributed in the height direction of the local wall b to be cut; when the rope saw is used for cutting operation later, the wall blocks between adjacent layers of holes and grooves e will be separated from other cut parts of the wall, reducing the height of the fragments generated during cutting to facilitate subsequent cleaning and transportation.

[0043] Please refer to the attached Figure 4 Step S3 includes setting two boundary lines at the top of the ground-connected wall a according to the width of the local wall b to be cut, and using a water drill to perform longitudinal continuous drilling along the boundary lines to form two longitudinal hole grooves d; setting boundary lines to limit the range of drilling holes to avoid the problem of lower structural strength of the corresponding position of the ground-connected wall a due to drilling deviation, and ensuring that the longitudinal continuous drilling can complete the cutting operation on both sides of the local wall b to be cut at the same time.

[0044] For further information, please refer to the attached Figure 7In order to adapt to the cutting operation of the local wall b to be cut with a larger width, a plurality of rows of hole grooves d can be evenly distributed in the width direction of the local wall b to be cut; when a rope saw is used for subsequent cutting operations, the wall blocks between adjacent rows of hole grooves d will be separated from other cut wall parts, reducing the width of the fragments generated during cutting to facilitate subsequent cleaning and transportation.

[0045] Step S4 includes setting a rope saw on the top of the ground connection wall a, moving the rope saw so that its rope body falls into the layer hole groove e and the two row hole grooves d, stopping after the rope body fits with the corresponding groove body, and fixing the position of the rope saw, and then starting the rope saw to cut the ground connection wall a between the layer hole groove e and the two row hole grooves d upward; when the rope saw is installed, its rope body can directly fall into the layer hole groove e and the two row hole grooves d, which reduces the difficulty of using the rope saw to cut the ground connection wall a, and can thereby increase the accuracy of the rope body operating position, thereby ensuring the cutting accuracy of the surface to be cut.

[0046] In order to prevent the cut partial wall from falling directly to the inside of the ground-connected wall and causing a safety accident, and to increase the safety of the operation, step S5 includes setting a support body inside the ground-connected wall for supporting the partial wall to be cut.

[0047] The present invention is described in detail above in conjunction with the embodiments of the accompanying drawings. A person skilled in the art can make various variations of the present invention according to the above description. Therefore, certain details in the embodiments should not constitute a limitation of the present invention, and the scope of protection of the present invention shall be defined by the scope of the attached claims.

Claims

1. A semi-cutting construction method for a ground-connected wall, used for cutting a local wall inside a protective ground-connected wall, characterized in that: The steps include: S1. Open grouting holes at set positions outside the ground-connected wall, and inject grouting into the soil outside the ground-connected wall through the grouting holes to reinforce the soil; S2. Use a water drill to continuously drill holes horizontally on the inner side of the ground-connected wall corresponding to the bottom of the local wall to be cut, so as to form a layer of hole grooves with a depth equal to the thickness of the local wall to be cut; S3, using a water drill to drill holes longitudinally and continuously on both sides of the top of the ground-connected wall corresponding to the local wall to be cut, to form two rows of hole grooves that are interconnected with the bottom and the inside of the layer hole groove; S4, using a rope saw, the rope body of the rope saw is arranged from the inner side of the ground connection wall to the outer side inside the layer hole groove and the two row hole grooves and close to the bottom of the groove, and then the rope saw is started to perform longitudinal cutting of the ground connection wall between the layer hole groove and the two row hole grooves; S5. The partial wall formed by cutting falls on the inner side of the ground-connected wall. After cleaning, the half-cutting operation of the ground-connected wall is completed.

2. The half-cut construction method of ground-connected wall according to claim 1 is characterized in that: Step S1 of opening grouting holes is specifically as follows: a number of opening points are evenly set in the outer side of the ground-connected wall corresponding to the local wall to be cut along the length direction parallel to the ground-connected wall, and then a drilling machine is used to drill holes according to the opening points. The depth of the drilling should be greater than the height of the local wall to be cut.

3. The half-cut construction method of ground-connected wall according to claim 1 is characterized in that: The grouting reinforcement of the soil in step S1 specifically includes: using a grouting machine to alternately grout ordinary Portland cement and water glass into the grouting hole, and the grouting pressure should not exceed 0.5 MPa.

4. The half-cut construction method of ground-connected wall according to claim 1 is characterized in that: Step S2 includes setting two boundary lines on the inner side of the ground-connected wall according to the width of the local wall to be cut, using a water drill to perform horizontal continuous drilling from any side boundary line until drilling reaches the other side boundary line, thereby forming a horizontal layer hole groove.

5. The half-cut construction method of ground-connected wall according to claim 1 is characterized in that: Step S3 includes setting two boundary lines at the top of the ground-connected wall according to the width of the local wall to be cut, and using a water drill to drill holes longitudinally and continuously along the boundary lines to form two longitudinal row hole grooves.

6. The half-cut construction method of ground-connected wall according to claim 1 is characterized in that: When executing step S4, the rope saw is moved so that the rope body falls into the layer hole groove and the two row hole grooves until the rope body fits with the corresponding groove bottom and stops, and the position of the rope saw is fixed. Then the rope saw is started to cut the ground connecting wall between the layer hole groove and the two row hole grooves upward.

7. The half-cut construction method of ground-connected wall according to claim 1 is characterized in that: Step S5 includes setting a support body on the inner side of the ground-connected wall for supporting the local wall to be cut.

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