CN115506419A - Seamless leakage-proof construction method for basement exterior wall - Google Patents

Abstract

The invention relates to a construction method for seamless leak-proofing of basement exterior walls, comprising the following steps: S1, installing multiple rows of diagonal braces for supporting the wall of a foundation pit in sequence from top to bottom, and after installing each row of diagonal braces, Clear the anti-pressure soil corresponding to the row of inclined throwing braces; S2. Clear all the anti-pressure soil in the foundation pit, and construct each floor sequentially from the bottom up; before the construction of the outer wall of each floor, remove the corresponding There are corresponding slant brace holes on the bottom plate of the floor that has been constructed; the corresponding slant brace means that the slant brace passes through the outer wall of the floor; During the construction of the first floor, concrete is used to fill the holes of the inclined throws. The present invention firstly removes the slanting braces, and then constructs the outer wall to prevent the slanting brace holes from being left on the outer wall, ensure the integrity of the outer wall structure, and achieve the effect of preventing leakage.

Description

A construction method for seamless leak-proofing of basement exterior walls

technical field

The invention relates to the technical field of building construction, in particular to a construction method for seamless leak-proofing of basement exterior walls.

Background technique

In the foundation pit excavation and underground structure construction, in order to speed up the construction progress and shorten the construction period, when supporting the slanting braces, the key parts such as the outer wall of the basement and the floor slabs of each floor of the basement are often constructed at the same time, and then demolished after the concrete strength meets the requirements. Diagonal throwing braces. At this time, large holes are left at the intersections of the diagonal throwing braces and the basement exterior wall and the floor slabs of each floor in the basement, which may easily cause surface water or groundwater to leak. Usually, waterproof materials are used to seal holes and other anti-leakage methods to deal with it. However, as time goes by, the sealing materials will hydrate, shrink or age and crack, which will easily produce gaps, which will still lead to leakage, and eventually cause the basement exterior walls and basements to be damaged. Unfavorable phenomena such as corrosion of steel bars on the floor slab.

Contents of the invention

(1) Technical problems to be solved

In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a seamless leak-proof construction method for the outer wall of the basement, which solves the technical problem of leakage of the outer wall of the basement caused by the disassembly of the oblique caster brace.

(2) Technical solution

In order to achieve the above object, the main technical solutions adopted in the present invention include:

A construction method for seamless leak-proofing of basement exterior walls, comprising the following steps:

S1. Install multiple rows of diagonal braces for supporting the foundation pit wall from top to bottom. After installing each row of diagonal braces, remove the back pressure soil corresponding to the row of diagonal braces;

Wherein, before installing each row of inclined throwing braces, an installation groove for installing diagonal throwing braces is opened on the counter pressure soil corresponding to the row of inclined throwing braces;

S2. Remove the remaining back pressure soil in the foundation pit, and construct each floor sequentially from the bottom up;

Before the construction of the outer wall of each floor, remove the corresponding slanting bracing of the floor, and leave the corresponding slanting bracing hole on the bottom plate of the floor that has been constructed;

The corresponding diagonal brace means that the diagonal brace passes through the outer wall of the floor;

When constructing the upper floor of the floor after the oblique throwing braces have been removed, the holes of the diagonal throwing braces are filled with concrete.

Preferably, in step S1, the foundation pit and the multi-layer back pressure soil are obtained by using pot excavation.

Preferably, before installing the slanted castor brace in step S1, a plurality of occlusal piles are poured along the wall of the foundation pit, and the occlusal piles are arranged along the vertical direction, and multiple occlusal piles are poured sequentially from top to bottom along the occlusal piles. A connecting beam, the connecting beam is arranged along the horizontal direction, the top of the diagonal brace is connected with the connecting beam, and the bottom of the diagonal brace is connected with the bottom of the foundation pit.

Preferably, the diagonal throwing brace includes an upper pier and a lower pier, and a steel support is provided between the upper pier and the lower pier.

Preferably, the upper pier and the connecting beam are integrally poured with reinforced concrete, the lower pier and the floor of the bottom floor are integrally poured with reinforced concrete, and the steel support is integrated with the upper pier and the lower pier. The buttresses touch each other.

Preferably, the contact surface between the upper pier and the steel support is a first connection surface, the contact surface between the lower pier and the steel support is a second connection surface, and the first connection surface and the The second connection surfaces are parallel to each other, and the first connection surface corresponds to the second connection surface.

Preferably, a steel anchor plate is provided between the upper pier and the connecting beam.

Preferably, during the construction of each floor, the bottom plate of the floor, the brace beams used to support the bottom and the outer wall are poured in sequence, and the diagonal braces corresponding to the floors need to be removed before pouring the outer wall.

Preferably, after removing all the back pressure soil in the foundation pit, tamp the inner bottom of the foundation pit, and pour concrete at the inner bottom of the foundation pit as a force transmission cushion, and pour the bottom plate of the bottom floor on the bottom of the foundation pit. The top of the force-transmitting cushion described above.

Preferably, when dismantling the oblique brace, when the steel support cannot be dismantled due to space constraints, the steel support can be divided into multiple sections before dismantling.

(3) Beneficial effects

The beneficial effects of the present invention are: (1) The present invention supports the wall of the foundation pit through the reserved back pressure soil to prevent deformation of the wall of the foundation pit.

(2) When the present invention is installed with multi-layer diagonal throwing braces, the multi-layer backpressure soil is removed successively from top to bottom. The throwing braces support the wall of the foundation pit together to maintain the stability of the foundation pit; multi-layer diagonal throwing braces are installed at the same time, shortening the time for installing the diagonal throwing braces, so as to shorten the construction period.

(3) The present invention removes the slanting brace first, and then carries out the construction of the outer wall, to prevent the slanting brace hole from being left on the outer wall, to ensure the integrity of the outer wall structure, and to achieve the effect of preventing leakage.

Description of drawings

Fig. 1 is a method block diagram in the embodiment of the present invention;

Fig. 2 is the installation schematic diagram of the oblique cast brace in the embodiment of the present invention;

Fig. 3 is the left side view and the combination view of each floor in Fig. 2 for the diagonal throwing brace.

[Description of Reference Signs]

1: crown beam; 2: installation groove; 3: lower pier; 4: upper backpressure soil; 5: lower backpressure soil; 10: upper pier; 11: negative first floor; 12: negative second floor; 13: negative third floor.

detailed description

In order to better explain the present invention and facilitate understanding, the present invention will be described in detail below through specific embodiments in conjunction with the accompanying drawings.

Example

As shown in Figures 1 to 3, a construction method for seamless leak-proofing of basement exterior walls includes the following steps:

S1. Install multiple rows of diagonal braces for supporting the foundation pit wall from top to bottom. After installing each row of diagonal braces, remove the back pressure soil corresponding to the row of diagonal braces;

Wherein, before installing each row of inclined throwing braces, an installation groove 2 for installing diagonal throwing braces is provided on the counter pressure soil corresponding to the row of inclined throwing braces.

Since the foundation pit has a certain length and width, and each row of diagonal braces includes multiple diagonal braces, it takes a certain amount of time to install each row of diagonal braces, so when installing each row of diagonal braces, as long as the installation of diagonal braces is completed After that, the backpressure soil corresponding to the diagonal throw can be removed.

The basement includes multiple floors, each floor including exterior walls, a floor, and braced beams supporting the floor.

As shown in Figures 2-3, in this embodiment, the depth of the foundation pit is 12.6m, the diameter of the occlusal piles is 1m, and the distance between adjacent occlusal piles is 1m. The basement to be built has three floors, and the order from top to bottom is Negative first floor 11 , negative second floor 12 and negative third floor 13 . Two layers of diagonal throw braces are installed by default, namely the upper row of diagonal throw braces and the lower row of diagonal throw braces. Correspondingly, there are two layers of back pressure soil in the foundation pit, which are the upper layer of back pressure soil 4 and the lower layer of back pressure soil 5 respectively.

Certainly the basement of this program is not limited to three floors, can be two floors, four floors or five floors, and the diagonal throwing brace and back pressure soil of this program are not limited to two floors, can be one floor, three floors or four floors.

As shown in Figure 2, in this embodiment, the upper layer of back pressure soil 4 is removed from left to right in sequence, and the upper row of inclined throwing braces is installed. Remove the back pressure soil 5 of the lower layer, install the lower row of inclined throwing braces, the lower row of inclined throwing braces includes a plurality of lower inclined throwing braces 9, and the plurality of lower inclined throwing braces 9 correspond to a plurality of upper inclined throwing braces 6 one by one. In order to shorten the construction period, the upper row of diagonal throw braces and the lower row of diagonal throw braces can be installed at the same time, that is, as long as the upper diagonal throw braces 6 are installed, the corresponding lower diagonal throw braces 9 can be installed. The direction of the arrow in Fig. 2 is the direction of removing the upper layer of back pressure soil 4 and the lower layer of back pressure soil 5, and the direction of installing the upper inclined throwing brace 6 and the lower inclined throwing brace 9.

In order to make full use of the supporting effect of the anti-pressure soil on the wall of the foundation pit, when installing the oblique throw brace, you can first open the installation groove 2 on the anti-pressure soil corresponding to the preset installation position of the oblique throw brace, and wait for the installation of the oblique throw brace to be completed Then clean up the back pressure soil.

As shown in Figure 2, specifically, when installing the upper row of inclined throwing braces in this embodiment, an installation groove 2 for installing the upper inclined throwing braces is first opened on the upper layer of counter pressure soil 4, and after the installation of the upper inclined throwing braces 6 is completed , and then clean up the upper layer of back pressure soil 4 corresponding to the upper inclined throw brace 6. In the same way, when installing the lower row of slanting struts, the installation groove 2 for installing the lower slanting struts 9 is first opened on the lower back pressure soil 5, and after the installation of the lower slanting struts 9 is completed, the lower slanting struts can be cleaned again. 9 corresponds to the lower layer of anti-pressure soil 5, or after all the lower inclined throwing braces 9 are installed, then the lower layer of back-pressure soil 5 is cleaned.

S11. The foundation pit is excavated by basin excavation, so that the wall of the foundation pit is covered with multiple layers of back pressure soil, and the back pressure soil is arranged around the walls of the foundation pit, and the back pressure soil can Support to prevent the deformation or collapse of the foundation pit wall.

S12. Before installing the slanting braces, pour a plurality of occlusal piles along the wall of the foundation pit. The occlusal piles are arranged along the vertical direction, and the connecting beams on the uppermost layer of the occlusal piles are arranged along the horizontal direction. It is connected with the connecting beam, and the bottom of the diagonal brace is connected with the bottom of the foundation pit.

The oblique cast support includes an upper pier 10 and a lower pier 3, and a steel support is arranged between the upper pier 10 and the lower pier 3.

In this embodiment, two layers of connecting beams are installed along the height direction of the occlusal pile 8, namely the crown beam 1 and the waist beam 7, the crown beam 1 is placed on the top of the occlusal pile 8, and the waist beam 7 is placed in the middle of the occlusal pile. The crown beam 1 and the waist beam 7 are respectively connected to the upper row of diagonal throw braces and the lower row of diagonal throw braces. In the present embodiment, the crown beam 1 is poured first.

S13. Tamp the preset position of the pouring lower pier 3, and lay 100mm thick C20 fine stone concrete as a force transmission cushion, pour the bottom slab of the bottom floor on the force transmission cushion, The top of the base plate of the floor pours the lower pier 3, and pours the upper pier 10 at the preset position of the uppermost connecting beam.

The upper pier 10 is connected with the connecting beam, and the lower pier 3 is connected with the bottom slab of the lowest floor. In this embodiment, the upper pier 10 and the connecting beam are integrally poured with reinforced concrete, and the lower pier and the floor of the bottom floor are integrally poured with reinforced concrete.

Before the upper buttress 10 and the lower buttress 3 are poured, a multi-point laser ranging method is used for measurement to determine the positions of the upper buttress 10 and the lower buttress 3 . The contact surface between the upper pier 10 and the steel support is the first connection surface, the contact surface between the lower pier 3 and the steel support is the second connection surface, the first connection surface and the second connection surface are parallel to each other, and the first connection surface and the second connection surface are parallel to each other. The two connection surfaces correspond to each other.

In order to increase the stressed area of the connecting beam and prevent the connecting beam from being overstressed locally, a steel anchor plate is provided between the connecting beam and the upper pier 10 .

In this embodiment, the upper pier 10 of the upper row of oblique casts is connected with the crown beam 1 through concrete, and the lower pier 3 of the upper row of oblique casts is connected with the bottom plate of the negative third floor 13 through concrete. The upper support pier 10 of the upper row of oblique throwing braces corresponds to the negative second floor 12, that is, the lower row of oblique throwing braces corresponds to the negative first floor 11.

S14. After the strength of the upper buttress 10 and the lower buttress 3 used to install the uppermost diagonal cast support reaches the preset value, the concrete poured on the upper buttress 10 and the lower buttress 3 is solidified, and its strength reaches the preset value Finally, the uppermost steel support is installed, the top of the steel support abuts against the upper pier 10, and the bottom end of the steel support abuts against the lower pier 3.

Specifically, firstly install the active head on the bottom of the steel support, and fix the active head in the steel support, use a crane to install the steel support at the preset position, pull out the active head, and make the bottom end of the active head and the lower branch The pier 3 abuts against each other, and the top of the steel support abuts against the upper pier 10 .

After the steel support is placed, it is necessary to apply prestress to the steel support in time through the hydraulic jack, so that the two ends of the steel support are in contact with the upper pier 10 and the lower pier 3 respectively.

S15. Install the diagonal braces of the remaining layers in sequence until all the diagonal braces are installed.

In this embodiment, the upper buttresses 10 of the lower row of oblique braces correspond to the negative second floor 12 , that is, the lower row of oblique braces correspond to the negative second floor 12 .

S2. Remove the remaining back pressure soil in the foundation pit, and construct each floor sequentially from the bottom of the foundation pit upwards;

Before the construction of the exterior wall of each floor, remove the corresponding slanting braces of the floor, and leave the corresponding slanting brace holes on the bottom plate of the floors that have been constructed;

The corresponding diagonal brace means that the diagonal brace in the design scheme passes through the outer wall of the floor;

When constructing the upper floor of the floor after the oblique throwing braces have been removed, the holes of the diagonal throwing braces are filled with concrete.

S21. Clear all the back pressure soil in the foundation pit, pour the remaining floor of the bottom floor, complete the pouring of the bottom floor of the entire bottom floor, and pour the outer wall of the bottom floor. The base plate of the lowest floor is the base plate on the base plate force transmission cushion of the foundation pit.

After installing all the slanting struts, the construction of the bottom floor is started, so in this embodiment, the bottom floor is not provided with corresponding slanting struts, that is, the height of the upper pier 10 of the lower row of slanting struts 9 It is higher than the height of the 13th floor of the negative third floor.

S22. Carry out construction on the remaining floors in turn. When constructing the remaining floors, first pour the supporting beams for supporting the bottom slab of the floor, then pour the bottom slab of the floor, remove the corresponding diagonal braces of the floor, and pour the floor At the same time, fill the oblique cast holes on the floor of the constructed floor.

In the process of dismantling the diagonal braces, it is necessary to observe the deformation of the foundation pit at any time, and first perform a trial demolition of the diagonal braces. If the foundation pit wall has no settlement deformation, or the settlement deformation is very small, the diagonal throw braces can be removed.

During the removal of the steel support, if it is not easy to take out the entire steel support, the steel support can be cut into multiple sections and then removed.

In the present embodiment, the supporting beams, base plates and outer walls of the third negative floor 13 are poured first, and then the supporting beams of the second negative floor 12 and the base plate of the second negative floor 12 are poured. Remove the lower row of oblique throwing braces, pour the outer wall of the negative second floor 12, the support beam of the base plate of the negative first floor 11, the base plate of the negative first floor 11 and the oblique throwing holes on the base plate of the negative second floor 12. Remove the upper row of slanted struts, pour the outer wall of the negative floor 11, the replacement beams of the top plate of the negative floor 11, the top plate of the negative floor 11, the slanted strut holes on the bottom plate of the negative second floor 12 and the negative floor 11 Diagonal support holes on the bottom plate.

In the description of the present invention, it should be understood that the terms "first" and "second" are used for description purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary; it can be the internal communication of two elements or the interaction relationship between two elements. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise clearly specified and limited, the first feature is "on" or "under" the second feature, which may be that the first and second features are in direct contact, or the first and second features pass through an intermediary indirect contact. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the level of the first feature is higher than that of the second feature . "Below", "below" and "under" the first feature may mean that the first feature is directly below or obliquely below the second feature, or it just means that the first feature is lower in level than the second feature.

In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" refers to the A particular feature, structure, material, or characteristic is described as included in at least one embodiment or example of the invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, those skilled in the art can make the above-mentioned The embodiments are subject to alterations, modifications, substitutions and variations.

Claims (10)

1. A construction method for seamless leak-proofing of basement exterior wall, is characterized in that, comprises the following steps: S1. Install multiple rows of diagonal braces for supporting the foundation pit wall from top to bottom. After installing each row of diagonal braces, remove the back pressure soil corresponding to the row of diagonal braces; Wherein, before installing each row of inclined throwing braces, an installation groove (2) for installing diagonal throwing braces is provided on the counter pressure soil corresponding to the row of inclined throwing braces; S2. Remove the remaining back pressure soil in the foundation pit, and construct each floor sequentially from the bottom up; Wherein, before the construction of the outer wall of each floor, the corresponding slanting braces of the floors are removed, and the corresponding slanting brace holes are left on the bottom plates of the floors that have been constructed; The corresponding diagonal brace means that the diagonal brace passes through the outer wall of the floor; When constructing the upper floor of the floor after the oblique throwing braces have been removed, the holes of the diagonal throwing braces are filled with concrete. 2. The construction method of the seamless leak-proof basement exterior wall according to claim 1, characterized in that, In step S1, the foundation pit and multiple layers of counter-pressure soil are obtained by means of pot excavation. 3. The construction method of the seamless leak-proof basement exterior wall according to claim 1, characterized in that, In step S1, prior to installing the slanting braces, a plurality of occlusal piles (8) are poured along the inner wall of the foundation pit, and the occlusal piles (8) are extended and arranged along the vertical direction, along the A plurality of connecting beams are poured sequentially from top to bottom, the connecting beams are arranged along the horizontal direction, the top of the diagonal braces is connected with the connecting beams, and the bottom of the diagonal braces is connected with the bottom of the foundation pit. connect. 4. The construction method for seamless leak-proofing of basement exterior wall according to claim 3, characterized in that, The oblique throwing brace comprises an upper pier (10) and a lower pier (3), and a steel support is provided between the upper pier (10) and the lower pier (3). 5. The construction method for seamless leak-proofing of basement exterior wall according to claim 4, characterized in that, The upper pier (10) and the connecting beam are integrally poured with reinforced concrete, the lower pier (3) and the floor of the bottom floor are integrally poured with reinforced concrete, and the steel support and the The upper pier (10) abuts against the lower pier (3). 6. The construction method for seamless leak-proofing of basement exterior wall according to claim 4, characterized in that, The contact surface between the upper pier (10) and the steel support is the first connection surface, the contact surface between the lower pier (3) and the steel support is the second connection surface, and the first connection surface The first connection surface is parallel to the second connection surface, and the first connection surface corresponds to the second connection surface. 7. The construction method for seamless leak-proofing of basement exterior wall according to claim 4, characterized in that, A steel anchor plate is provided between the upper pier (10) and the connecting beam. 8. The construction method for seamless leak-proofing of basement exterior wall according to claim 1, characterized in that, During the construction of each floor, the base plate of the floor and the supporting beams for supporting the bottom are poured successively, the corresponding diagonal throwing braces of the floor are removed, and the outer walls of the floor are poured. 9. The construction method for seamless leak-proofing of basement exterior wall according to claim 1, characterized in that, After removing all the back pressure soil in the foundation pit, the construction of the bottom slab of the lowest floor is completed. 10. The construction method for seamless leak-proofing of basement exterior wall according to claim 4, characterized in that, When dismantling the oblique brace, when the steel support cannot be removed due to space constraints, the steel support can be divided into multiple sections and then removed.

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